Company: TSI
Filing Date: 2025-08-08
Form Type: N-2
Source: 0001193125-25-177098
Chunk: 136

Company: TCW STRATEGIC INCOME FUND INC
Filing Date: 2025-08-08
Form: N-2
Chunk 136
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”) is
not a prospectus and is authorized for distribution to prospective investors only if preceded or accompanied by the prospectus for the Fund dated [ ], 2025, as supplemented from time to time, which is incorporated herein by reference. This
SAI should be read in conjunction with such prospectus, a copy of which may be obtained without charge by contacting your financial intermediary or by calling the Fund at 1-800-FUND-TCW (1-800-386-3829). You may also obtain a copy of the
prospectus on the Securities and Exchange Commission’s (the “SEC”) website (http://www.sec.gov).

Capitalized terms used
but not defined in this SAI have the meanings ascribed to them in the prospectus.

THIS STATEMENT OF ADDITIONAL INFORMATION IS DATED [ ], 2025.

TABLE OF CONTENTS STATEMENT OF ADDITIONAL INFORMATION

| The Fund                                        |     |   2 |
| Investment Objective and Policies               |     |   2 |
| Investment Restrictions                         |     |  28 |
| Management of the Fund                          |     |  29 |
| Portfolio Transactions and Brokerage Allocation |     |  43 |
| Descriptions of Common Stock                    |     |  45 |
| Repurchase of Common Stock                      |     |  46 |
| Tax Matters                                     |     |  46 |
| Proxy Voting Policy and Proxy Voting Record     |     |  53 |
| Financial Statements                            |     |  56 |
| Legal Counsel                                   |     |  56 |
| Additional Information                          |     |  56 |
| Appendix A—Description of S&P and Moody’s       
 Ratings                                         |     | A-1 |
| Appendix B—Proxy Voting Policy and Procedures   |     | B-1 |

THE FUND

TCW Strategic Income Fund, Inc. is a closed-end, diversified, management investment company registered
under the 1940 Act. Fund was incorporated in Maryland on January 13, 1987 and commenced operations on March 5, 1987.

The shares
of Common Stock of the Fund are listed on the New York Stock Exchange (“NYSE”) under the symbol “TSI.” As of [ ], 2025, the Fund has [ ] shares of Common Stock outstanding.

INVESTMENT OBJECTIVE AND POLICIES

The Fund’s investment objective is to seek a total return comprised of current income and capital appreciation. There can be no assurance
that the Fund