A new tax period has begun for companies investing in money market funds. So, how does this change affect SMEs’ daily cash management, short-term investment decisions, and accounting processes? In this guide, we bring together the key points about withholding tax on corporate fund income and answer the most frequently asked questions.
For SMES and corporate taxpayers that closely monitor their daily financial transactions, money market funds are important financial instruments for managing short-term cash. With Presidential Decision No. 11734, published in the Official Gazette on September 5, the taxation of gains earned by institutional investors from money market funds was revised.
The withholding tax rate, which had previously been 0%, was increased to 10% under the new regulation. So, how does this change affect your company’s cash management, short-term investment preferences, and accounting procedures? Below, we explain the key points SMEs should consider.

The new regulation introduces changes to the withholding tax rates set out in Provisional Article 67 of the Income Tax Law concerning the taxation of capital market instruments.

At first glance, the new withholding tax rate may appear to create an additional tax cost for companies. However, its impact from an accounting and financial perspective is somewhat different.
Important: Fully liable corporations are already required to include income earned from money market funds in the Corporate Income Tax base for the relevant period. Therefore, the 10% withholding tax does not represent a direct increase in the company’s final tax burden. Instead, it functions as tax paid in advance.
The 10% withholding tax deducted by the financial institution when the fund is sold can be offset against the tax calculated in the company’s Provisional Tax and Corporate Income Tax returns at the end of the relevant period.
Therefore, there is no change in the company’s total annual tax burden. The main change is that the timing of the tax-related cash outflow is brought forward.
To illustrate the process more clearly, assume that your company invests TRY 1,000,000 of its cash in a money market fund after September 5 and earns a gross return of TRY 100,000 from the investment:
| Calculation Item | Previous Practice (0% Withholding Tax) | New Practice (10% Withholding Tax) |
|---|---|---|
| Principal | TRY 1,000,000 | TRY 1,000,000 |
| Gross Fund Return | TRY 100,000 | TRY 100,000 |
| Withholding Tax Deducted by the Bank/Institution | TRY 0 | TRY 10,000 |
| Net Cash Credited to the Account | TRY 1,100,000 | TRY 1,090,000 |
| Tax Offset at the End of the Period | No withholding tax to offset | TRY 10,000 offset against the calculated tax |
In this example, the net cash credited to the company’s account at the time of sale is TRY 10,000 lower under the new practice. However, since this amount can be offset against the Corporate Income Tax liability calculated at the end of the period, it is taken into account in the final tax calculation.

Thanks to their daily liquidity advantage, money market funds remain an important option for SMEs looking to make use of cash that will be needed in the short term. Cash that is temporarily idle before invoice, payroll, or supplier payments can be managed through such instruments.
The new withholding tax regulation for money market funds should not be viewed solely as a change in the tax rate. For SMEs, it should also be considered a process that requires closer monitoring of cash flow and tax offsets.
To prevent potential tax losses at the end of the period and ensure that withholding taxes deducted from fund income are fully utilized against Corporate Income Tax, it is important to regularly review bank transactions and accounting records.