Turkey Investment Income Tax: How the Structure Works
Tax is the area where a data site should be most careful about what it claims. Rates and thresholds in Turkey change, treatment depends on your residence status and your home country’s treaty with Turkey, and a wrong number here costs a reader real money. So this explains the structure and points you at the authority; it does not publish a rate table.
Residence status decides most of it
The first question is not what you hold but whether Turkey treats you as a tax resident. Residents and non-residents are taxed on a different scope of income, and the determination turns on presence and centre-of-interests tests rather than on nationality or on holding a tax number.
If you hold a Turkish tax number but live abroad, do not assume you are a non-resident for tax purposes, and do not assume you are a resident either. It is a determination, and it is the one to settle before anything else.
Double taxation treaties
Turkey has an extensive treaty network. Where a treaty applies, it can change which country may tax a given class of income and cap the rate at source. This is why generic articles about “Turkish investment tax” are unreliable for any specific reader: the answer depends on a bilateral agreement that differs between countries.
Withholding at source
The mechanism that most affects the comparisons on this site is withholding. Turkey withholds tax at source on some investment income and not on other kinds, and that asymmetry changes what an advertised return actually means.
The concrete case we rely on throughout the site: interest on bank deposits is subject to withholding, while returns on money market funds are not. A deposit rate quoted gross and a fund return are therefore not comparable figures. Our deposit equivalent comparison exists precisely to put them on the same footing, by expressing each fund’s return as the gross deposit rate that would leave you in the same place.
Different fund categories can be treated differently. Do not generalise the money market treatment to equity or hedge funds.
Why we do not publish rates
Three reasons, and they are not evasions:
- They change, sometimes more than once in a year. An evergreen page with a stale rate is actively misleading.
- They vary by holding period and instrument in ways a single number cannot express.
- Your treaty position can override them.
FonIndex publishes market data. It is not a tax adviser and is not licensed as one.
Where the authoritative answer lives
- The Revenue Administration (Gelir İdaresi Başkanlığı) for current rates and residence rules
- The treaty text between Turkey and your country of residence
- A tax adviser in both jurisdictions — a Turkish adviser alone will not tell you what your home country does with the same income
What this means for reading returns here
Every return on this site is pre-tax from your perspective, because your tax position is unknowable to us. The one adjustment we do make is the withholding difference between funds and deposits, and we state it explicitly wherever it is applied. Everything else is a figure you need to translate into your own situation.