Before you start

A valid passport (the only thing needed for the tax number itself — no residence permit required)
An e-Devlet login if you want to apply / file online (or just walk into any vergi dairesi)
Clarity on your day-count and home base for the calendar year (drives the 183-day residency test)
For freelancers: a muhasebeci (accountant) and a Turkish address to register the business

Step-by-step

1
Get your tax number (vergi kimlik numarası)
Free and open to any foreigner. Apply online via GİB's Dijital/İnteraktif Vergi Dairesi 'Potansiyel Vergi Kimlik Numarası' form (enter your name in CAPITALS exactly as in the passport, and upload the photo page), or in person at any tax office with your passport plus a photocopy. The 10-digit number is usually issued instantly. Once you hold a residence permit, your foreigner ID number (YKN) functions as your tax number, so you may not need a separate one.
OnlineWho: YouMinutes online; same-day in personFree
2
Work out your tax residency & worldwide-income exposure
You become a Turkish tax resident if you establish a legal residence (ikametgah) here OR stay more than six months (183 days) in a calendar year. Residents are taxed on worldwide income; non-residents only on Turkish-source income. A narrow exception: people in Türkiye solely for a specific, temporary assignment can stay past six months and remain non-resident. Remote workers paid from abroad should map their day-count before they trip the line unaware.
OnlineWho: You (ideally with an accountant)Assess on arrival; reassess each calendar year
3
Employee withholding OR register a sole proprietorship
Employees: your employer withholds income tax via payroll (stopaj) across the progressive brackets, and you usually never file a return. Freelancers / remote workers: register a sole proprietorship (şahıs şirketi / serbest meslek) at the tax office. If you are 18-29 and it is your first business, file the start-up notice within 10 days to claim the genç girişimci (young entrepreneur) income-tax exemption — a sizeable slice of annual profit is exempt for three years. Note: as of 1 Jan 2026 the matching Bağ-Kur premium support was repealed, so you now pay your own social-security premiums from day one.
In personWho: You (employer handles withholding for employees)Registration ~1 day with an accountant
4
Get a muhasebeci, then handle VAT & quarterly provisional tax
A sole proprietorship must keep books, issue e-invoices, charge/file KDV (VAT, standard rate 20% — though services invoiced to clients abroad can often qualify for 0% VAT/export exemption), and pay quarterly provisional tax (geçici vergi) on running profit. In practice an accountant is mandatory: they file your monthly VAT, quarterly provisional returns, and annual return. Budget a recurring monthly fee plus your own Bağ-Kur/SGK premiums.
In personWho: Your accountant (muhasebeci)Monthly + quarterly cycleAccountant a few thousand TRY/month; plus VAT & SGK
5
File the annual return (or use Hazır Beyan)
Türkiye's tax year is the calendar year; annual income-tax returns are filed in MARCH for the previous year, with tax payable in two instalments (end of March and end of July). File through GİB's İnteraktif Vergi Dairesi, or use Hazır Beyan (the pre-filled 'ready declaration' system) for simple income such as rent or limited employment income. Most pure employees with a single withheld salary do not file at all.
OnlineWho: You / your accountantMarch each year; payment in March & July

Documents you’ll need

Passport (and a photocopy of the photo page for in-person applications)
Residence permit / foreigner ID (YKN) if you have one — it links to your tax number
Proof of a Turkish address (for registering a sole proprietorship)
Income/expense records and e-invoices (for freelancers' VAT & annual filing)

Things most newcomers don’t know

The tax number is free, passport-only, and obtainable before you have any residence permit.

It is the gateway to opening a bank account, buying property, and setting up utilities — so getting it online via GİB on day one unblocks almost everything else. Once you do get a residence permit, your YKN doubles as the tax number.

Source: GİB Dijital Vergi Dairesi

Crossing ~183 days (or holding a legal residence) flips you to worldwide-income taxation.

Non-residents are taxed only on Turkish-source income, but tax residents owe Turkish tax on global earnings. Remote workers paid from abroad can trip this line unaware simply by staying too long in a calendar year.

Source: PwC Worldwide Tax Summaries (Turkey)

The genç girişimci exemption survives into 2026 — but its Bağ-Kur premium support was repealed from 1 Jan 2026.

Under-29s on their first business still get a large chunk of profit exempt from income tax for three years (the cap is re-indexed yearly), but as of 2026 they must pay their own social-security (Bağ-Kur) premiums — a real monthly cost that used to be covered. You must also file the start-up notice within 10 days to qualify.

Source: Law No. 7566 (Resmî Gazete, Dec 2025) + accounting sources

For freelancers, an accountant (muhasebeci) is effectively mandatory, not optional.

A sole proprietorship must keep formal books and file monthly VAT, quarterly provisional tax, and the annual return — all in Turkish through GİB systems. Almost nobody does this solo; budget a recurring monthly accountant fee from the start.

Source: Provider/accounting consensus

Common mistakes to avoid

Tripping the 183-day residency line unaware and unexpectedly owing Turkish tax on your worldwide income.
Freelancing or invoicing clients without registering a sole proprietorship and charging/filing VAT.
US citizens forgetting they must still file with the IRS (using FEIE/FTC) on top of any Turkish obligations.
Not budgeting for an accountant, quarterly provisional tax, and 2026 self-paid Bağ-Kur premiums when going freelance.