Finland Sole Trader — Toiminimi Income Tax Return (OmaVero)

Establish the client's tax profile: confirm they are a resident sole trader (toiminimiyrittäjä) or freelancer (ammatinharjoittaja) — not an Oy or partnership — and identify their municipality of residence, which is mandatory because municipal tax rates range from 4.73% to 10.86% and cannot be defaulted. Confirm church membership status for church tax applicability.

Collect and reconcile the full-year bookkeeping records. Single-entry bookkeeping (muistiinpanot) is sufficient for most toiminimi; double-entry is required only if turnover exceeds the accounting law threshold. Agree gross revenue, cost of sales, and operating expenses against bank statements and sales invoices. Separate VAT-inclusive figures from net if the client is VAT-registered.

Apply all allowable deductions against the net business income figure. Key items for Finnish sole traders: YEL pension insurance premiums (personal deduction, not a business expense), home office deduction (työhuonevähennys €940/€470 fixed or actual), business travel per diem (€51 full day, €24 half day) and km allowance (€0.30/km), and the earned income deduction (työtulovähennys, automatically applied). Flag non-deductible items such as fines, personal clothing, and commuting.

Compute the statutory split of net business income into capital income (pääomatulo) and earned income (ansiotulo). The default is 20% of closing net business assets = capital income, taxed at 30%/34%; remainder is earned income taxed at progressive state rates plus municipal and health insurance. Offer the client the option to elect 10% or 0% if the earned income bracket analysis favours it.

Compare the estimated final tax liability against prepayment tax (ennakkovero) already paid or scheduled during the year. If the client is likely to face a significant residual tax (jäännösvero), adjust remaining instalments via OmaVero before year-end to reduce interest exposure. For first-year entrepreneurs, set up the initial prepayment registration. Monthly instalments are typically due on the 23rd of each month.

File the annual tax return (veroilmoitus) in OmaVero by the 1 April deadline. Verohallinto pre-populates the return from employer, bank, and pension data; the self-employed taxpayer must add business income, expenses, YEL deduction, and any elections (capital income split percentage). Attach the tuloslaskelma and tase if using double-entry bookkeeping. Retain all supporting records for 6 years.

After Verohallinto issues the final tax assessment (verotuspäätös), typically October–November, review it for accuracy. If a residual tax (jäännösvero) is due, confirm the payment deadline (typically December or February in two instalments if over €170) and set a reminder. If a refund (veronpalautus) is due, confirm the bank account registered in OmaVero is correct for direct deposit.