Finnish taxes are a withholding system first and a spring correction second. Get the tax card right when work starts, then treat the pre-completed return as a review, not a blank exam.
What do you do when work starts?
Request a tax card in MyTax after you can log in with Suomi.fi identification: Set up Suomi.fi and Open a bank account. Report expected wages so Verohallinto sets a withholding rate and income ceiling. Many employers pull the card electronically; ask HR whether you must deliver a PDF.
New arrivals staying longer than six months usually become resident taxpayers (general tax liability) and may need Form 5042-style foreign-resident tax-card steps if MyTax is not yet open. Stays of six months or less often use tax-at-source rules instead. Read Vero’s arriving-in-Finland pages for your occupation before you guess: Get a henkilötunnus.
How does the annual return work?
Toward spring, Verohallinto builds a pre-completed tax return from employer and other third-party reports. Log into MyTax, check income, deductions, and foreign-income lines, then correct anything missing before the deadline shown in your return. Over-withholding produces a refund; under-withholding produces back taxes.
Tax treaties can limit double taxation when you still have income abroad. Keep payslips, foreign tax statements, and arrival dates with your Migri and DVV folder: Apply for residence and Register address. Budget net pay, not gross, inside Monthly budget and How expensive is Finland.
Common misconceptions
Assuming no tax card means zero tax fails. Employers may withhold at a punitive default rate until a card exists.
Assuming the pre-completed return needs no review also fails. Foreign income, deductions, and first-year arrival dates often need your correction.
Summary
Get a Verohallinto tax card through MyTax as soon as work starts, then check the pre-completed return each spring. Tie the tax file to your henkilötunnus, bank login, and stay timeline so withholding and residency status match the life you actually live in Finland.
Sources
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