| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS (Details 1) (USD $)**                                                                                                                                                                             | 3 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                            | $ 55,114       |  | $ 297,259 |  |
| Interest and other                                                                                                                                                                                                                                | 874            |  | 5,792 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                   | 55,988         |  | 303,051 |  |
| **Expenses**                                                                                                                                                                                                                                      |           |  |   |  |
| Interest                                                                                                                                                                                                                                          | 5,032          |  | 29,616 |  |
| Depreciation and amortization                                                                                                                                                                                                                     | 7,104          |  | 70,083 |  |
| Operating expenses                                                                                                                                                                                                                                | 56,986         |  | 249,614 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                             | 69,122         |  | 349,313 |  |
| NET LOSS                                                                                                                                                                                                                                          | (13,134)       |  | (46,262) |  |
| Net Loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                         | (13,003)       | [1] | (45,799) | [1] |
| Net Loss allocated to other partners                                                                                                                                                                                                              | (131)          |  | (463) |  |
| Series One [Member]                                                                                                                                                                                                                               |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| 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]                                                                                                                                                                                                                               |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| 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]                                                                                                                                                                                                                             |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| Rental                                                                                                                                                                                                                                            | 55,114         |  | 297,259 |  |
| Interest and other                                                                                                                                                                                                                                | 874            |  | 5,792 |  |
| Operating Partnerships Revenues                                                                                                                                                                                                                   | 55,988         |  | 303,051 |  |
| **Expenses**                                                                                                                                                                                                                                      |           |  |   |  |
| Interest                                                                                                                                                                                                                                          | 5,032          |  | 29,616 |  |
| Depreciation and amortization                                                                                                                                                                                                                     | 7,104          |  | 70,083 |  |
| Operating expenses                                                                                                                                                                                                                                | 56,986         |  | 249,614 |  |
| Operating Partnerships Total Expenses                                                                                                                                                                                                             | 69,122         |  | 349,313 |  |
| NET LOSS                                                                                                                                                                                                                                          | (13,134)       |  | (46,262) |  |
| Net Loss allocated to Boston Capital Tax Credit Fund Limited Partnership*                                                                                                                                                                         | (13,003)       | [1] | (45,799) | [1] |
| Net Loss allocated to other partners                                                                                                                                                                                                              | (131)          |  | (463) |  |
| Series Four [Member]                                                                                                                                                                                                                              |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| 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]                                                                                                                                                                                                                              |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| 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]                                                                                                                                                                                                                               |           |  |   |  |
| **Revenue**                                                                                                                                                                                                                                       |           |  |   |  |
| 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 $13,003 and $45,799 for 2014 and 2013, respectively, of loss not recognized under the equity method of accounting.[2]Amounts include $0, for both 2014 and 2013, 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.
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| X                                                                                                                                                    |
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