# EDGAR Filing Document

**Accession Number:** 0000751199
**File Stem:** 0000751199-25-000369
**Filing Date:** 2025-12
**Character Count:** 5680
**Document Hash:** 73ccc6f988a4ed257306798d011cf19b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000751199-25-000369.hdr.sgml**: 20251212

**ACCESSION NUMBER**: 0000751199-25-000369

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251212

**DATE AS OF CHANGE**: 20251212

**EFFECTIVENESS DATE**: 20251212

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY INCOME FUND /MA/
- **CENTRAL INDEX KEY:** 0000751199

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0731

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-92661
- **FILM NUMBER:** 251566773

**BUSINESS ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 617-563-7000

**MAIL ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY MORTGAGE SECURITIES FUND
- **DATE OF NAME CHANGE:** 19851103

## Series and Classes Contracts Data

### Fidelity Total Bond Fund (Series ID: S000007066)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                | Ticker Symbol | Class ID   |
| Fidelity Total Bond Fund                  | FTBFX         | C000019272 |
| Fidelity Advisor Total Bond Fund: Class A | FEPAX         | C000019273 |
| Fidelity Advisor Total Bond Fund: Class C | FCEPX         | C000019275 |
| Fidelity Advisor Total Bond Fund: Class M | FEPTX         | C000019276 |
| Fidelity Advisor Total Bond Fund: Class I | FEPIX         | C000019277 |
| Fidelity Advisor Total Bond Fund: Class Z | FBKWX         | C000150510 |

---

### Fidelity Total Bond K6 Fund (Series ID: S000057288)

---

|  |  |  |
|:---|:---|:---|
| Class Name                  | Ticker Symbol | Class ID   |
| Fidelity Total Bond K6 Fund | FTKFX         | C000182864 |

---

## Series and Classes Contracts Data

### Fidelity Total Bond Fund (Series ID: S000007066)

| Class ID   | Class Name                                | Ticker Symbol   |
|:---|:---|:---|
| C000019272 | Fidelity Total Bond Fund                  | FTBFX           |
| C000019273 | Fidelity Advisor Total Bond Fund: Class A | FEPAX           |
| C000019275 | Fidelity Advisor Total Bond Fund: Class C | FCEPX           |
| C000019276 | Fidelity Advisor Total Bond Fund: Class M | FEPTX           |
| C000019277 | Fidelity Advisor Total Bond Fund: Class I | FEPIX           |
| C000150510 | Fidelity Advisor Total Bond Fund: Class Z | FBKWX           |

### Fidelity Total Bond K6 Fund (Series ID: S000057288)

| Class ID   | Class Name                  | Ticker Symbol   |
|:---|:---|:---|
| C000182864 | Fidelity Total Bond K6 Fund | FTKFX           |

**Supplement to the Fidelity® Total Bond K6 Fund October 30, 2025 Prospectus**

*It is expected that Mr. O'Neil will transition off the fund effective on or about September 30, 2026. Julian Potenza will become a Co-Portfolio Manager for the fund effective April 1, 2026.*

Effective April 1, 2026, the following information supplements information found in the "Fund Summary" section under the "Portfolio Manager(s)" heading.

Julian Potenza (Co-Portfolio Manager) has managed the fund since 2026.

Effective April 1, 2026, the following information supplements the biographical information found in the "Fund Management" section under the "Portfolio Manager(s)" heading.

Julian Potenza is Co-Portfolio Manager of Fidelity® Total Bond K6 Fund, which he has managed since 2026. He also manages other funds. Since joining Fidelity Investments in 2007, Mr. Potenza has worked as a research analyst and portfolio manager.

TBDK6-PSTK-1225-104 1.9886691.104 December 12, 2025

**Supplement to the Fidelity® Total Bond Fund October 30, 2025 Prospectus**

*It is expected that Mr. O'Neil will transition off the fund effective on or about September 30, 2026. Julian Potenza will become a Co-Portfolio Manager for the fund effective April 1, 2026.*

Effective April 1, 2026, the following information supplements information found in the "Fund Summary" section under the "Portfolio Manager(s)" heading.

Julian Potenza (Co-Portfolio Manager) has managed the fund since 2026.

Effective April 1, 2026, the following information supplements the biographical information found in the "Fund Management" section under the "Portfolio Manager(s)" heading.

Julian Potenza is Co-Portfolio Manager of Fidelity® Total Bond Fund, which he has managed since 2026. He also manages other funds. Since joining Fidelity Investments in 2007, Mr. Potenza has worked as a research analyst and portfolio manager.

TBD-PSTK-1225-121 1.780489.121 December 12, 2025

**Supplement to the Fidelity® Total Bond Fund Class A, Class M, Class C, Class I, and Class Z October 30, 2025 Prospectus**

*It is expected that Mr. O'Neil will transition off the fund effective on or about September 30, 2026. Julian Potenza will become a Co-Portfolio Manager for the fund effective April 1, 2026.*

Effective April 1, 2026, the following information supplements information found in the "Fund Summary" section under the "Portfolio Manager(s)" heading.

Julian Potenza (Co-Portfolio Manager) has managed the fund since 2026.

Effective April 1, 2026, the following information supplements the biographical information found in the "Fund Management" section under the "Portfolio Manager(s)" heading.

Julian Potenza is Co-Portfolio Manager of Fidelity® Total Bond Fund, which he has managed since 2026. He also manages other funds. Since joining Fidelity Investments in 2007, Mr. Potenza has worked as a research analyst and portfolio manager.

ATB-PSTK-1225-142 1.808071.142 December 12, 2025