| **INVESTMENTS IN OPERATING PARTNERSHIPS (Details 2) (USD $)**                                                                                                                                                                                      | 9 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | $ 491,775      |  | $ 950,138 |  |
| Interest and other                                                                                                                                                                                                                                 | 8,888          |  | 31,740 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 500,663        |  | 981,878 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 48,969         |  | 93,054 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 121,005        |  | 223,897 |  |
| Operating expenses                                                                                                                                                                                                                                 | 390,922        |  | 808,608 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 560,896        |  | 1,125,559 |  |
| NET LOSS                                                                                                                                                                                                                                           | (60,233)       |  | (143,681) |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | (59,631)       | [1] | (142,244) | [1] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | (602)          |  | (1,437) |  |
| Series One [Member]                                                                                                                                                                                                                                |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 0              |  | 0 |  |
| Interest and other                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 0              |  | 0 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 0              |  | 0 |  |
| Operating expenses                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 0              |  | 0 |  |
| NET LOSS                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | 0              | [2] | 0 | [2] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | 0              |  | 0 |  |
| Series Two [Member]                                                                                                                                                                                                                                |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 0              |  | 0 |  |
| Interest and other                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 0              |  | 0 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 0              |  | 0 |  |
| Operating expenses                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 0              |  | 0 |  |
| NET LOSS                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | 0              | [2] | 0 | [2] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | 0              |  | 0 |  |
| Series Three [Member]                                                                                                                                                                                                                              |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 491,775        |  | 950,138 |  |
| Interest and other                                                                                                                                                                                                                                 | 8,888          |  | 31,740 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 500,663        |  | 981,878 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 48,969         |  | 93,054 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 121,005        |  | 223,897 |  |
| Operating expenses                                                                                                                                                                                                                                 | 390,922        |  | 808,608 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 560,896        |  | 1,125,559 |  |
| NET LOSS                                                                                                                                                                                                                                           | (60,233)       |  | (143,681) |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | (59,631)       | [1] | (142,244) | [1] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | (602)          |  | (1,437) |  |
| Series Four [Member]                                                                                                                                                                                                                               |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 0              |  | 0 |  |
| Interest and other                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 0              |  | 0 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 0              |  | 0 |  |
| Operating expenses                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 0              |  | 0 |  |
| NET LOSS                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | 0              | [2] | 0 | [2] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | 0              |  | 0 |  |
| Series Five [Member]                                                                                                                                                                                                                               |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 0              |  | 0 |  |
| Interest and other                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 0              |  | 0 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 0              |  | 0 |  |
| Operating expenses                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 0              |  | 0 |  |
| NET LOSS                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | 0              | [2] | 0 | [2] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | 0              |  | 0 |  |
| Series Six [Member]                                                                                                                                                                                                                                |           |  |   |  |
| **Revenues**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                             | 0              |  | 0 |  |
| Interest and other                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                    | 0              |  | 0 |  |
| **Expenses**                                                                                                                                                                                                                                       |           |  |   |  |
| Interest                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Depreciation and amortization                                                                                                                                                                                                                      | 0              |  | 0 |  |
| Operating expenses                                                                                                                                                                                                                                 | 0              |  | 0 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                              | 0              |  | 0 |  |
| NET LOSS                                                                                                                                                                                                                                           | 0              |  | 0 |  |
| Net loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                          | 0              | [2] | 0 | [2] |
| Net loss allocated to other Partners                                                                                                                                                                                                               | $ 0            |  | $ 0 |  |
|                                                                                                                                                                                                                                                    |
| [1]Amounts include $59,631 and $142,244 for 2013 and 2012, respectively, of loss not recognized under the equity method of accounting.[2]Amounts include $0, for both 2013 and 2012, of loss not recognized under the equity method of accounting. |

| X                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of depreciation and amortization by an operating partnerships of the entity.
+ References
No definition available.
+ Details**Name:**bctc_OperatingPartnershipsDepreciationAndAmortization**Namespace Prefix:**bctc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of interest and other income by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of interest expenses by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) allocated to other partners by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) allocated to parent by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of operating expenses by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of rental income by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of revenues by an operating partnerships of the entity.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of total expenses by an operating partnerships of the entity.
+ References
No definition available.
+ Details**Name:**bctc_OperatingPartnershipsTotalExpenses**Namespace Prefix:**bctc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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