Accounting, VAT and Tax in Finland 2026: Complete Practical Guide for an Oy
Explains how accounting works for a Finnish Oy: income/expenses, VAT, prepayment tax, corporate tax, payroll, Incomes Register, documentation and year-end closing.
Short answer
A Finnish Oy is taxed on taxable profit, not turnover. Turnover is total sales; profit is the result after deductible business expenses. VAT is a separate system and is not corporate income tax. Prepayment tax is based on estimated taxable profit and should be updated when the forecast changes. Payroll creates Incomes Register and employer obligations. The most important practical rule is to separate company and personal money and document every business expense.
1. Turnover, profit and taxable income are different
Turnover is sales revenue. Profit is sales minus business expenses. Taxable income can differ from accounting profit because tax rules can disallow or adjust certain expenses.
This distinction matters in entrepreneur permits, banking and acquisitions. Saying a company has EUR 100,000 turnover does not mean it earned EUR 100,000 profit.
2. Why business expenses need documentation
Paying an expense from the company account does not automatically make it tax-deductible. The business purpose, amount, supplier and VAT details should be documented.
Missing receipts, unexplained transfers, personal purchases and unclear travel expenses create accounting and tax risk.
3. How does VAT work?
VAT is not tax on company profit. A VAT-registered business charges output VAT on taxable sales, deducts eligible input VAT on business purchases and reports the difference to Vero for the relevant period.
Not every sale uses the same VAT treatment and not every input VAT amount is deductible. Cross-border transactions, reverse charge, intra-EU sales, exports and special sectors require separate analysis.
4. Why prepayment tax should be updated during the year
Prepayment tax is paid during the year based on estimated taxable profit. If actual performance differs materially from the estimate, leaving the old estimate unchanged can create a large balancing tax or unnecessary overpayment.
When revenue or costs change significantly, revise the profit forecast and update prepayment tax through MyTax.
5. Paying wages involves more than net salary
When a company pays wages, gross salary, withholding, employer contributions, pension/insurance, holiday pay and other employment costs must be considered together.
Wages must be reported to the Incomes Register on time. Regular employers also submit the employer's separate report monthly. A bank transfer alone is not a complete payroll process.
6. Money movements between shareholder and company
When money moves between shareholder and company, its legal/accounting nature should be clear: capital, loan, expense reimbursement, salary, dividend or another category. The same transfer should not be described inconsistently.
Personal spending on company cards and unexplained withdrawals increase tax and accounting risk. Shareholder balances should be reconciled regularly.
7. How to prepare for year-end closing
Year-end is not only an accountant's technical exercise. Confirm receivables, payables, inventory, fixed assets, loans/leases, holiday liabilities, bank/cash, shareholder balances and tax positions.
Missing documents should be resolved before closing because they directly affect financial statements and the tax return.
8. Common accounting and tax mistakes
Many expensive mistakes come from basic process failures rather than sophisticated tax issues: missing receipts, mixing personal/company funds, wrong VAT treatment, paying wages outside payroll, failing to update prepayment tax and missing PRH/financial-statement deadlines.
A strong accounting system is simple: receive the document, classify it correctly, record it in the proper period, track the deadline and correct deviations quickly.
9. Monthly accounting checklist
Completing the following review every month prevents many year-end problems.
Checklist
- Are all sales invoices recorded?
- Are all purchase invoices and receipts received?
- Do bank/card movements match documents?
- Is cash reconciled if used?
- Is VAT classification correct?
- Do payroll and expense reimbursements match records?
- Are Incomes Register reports complete?
- Are shareholder transfers classified correctly?
- Have receivables/payables been reviewed?
- Are any tax or PRH deadlines approaching?
Common questions about this topic
Does an Oy pay corporate tax on turnover or profit?
Corporate income tax is based on taxable profit; turnover itself is not the corporate-tax base. VAT is a separate system.
Can I use the company card for personal purchases?
The payment can technically occur, but it must be treated correctly as personal rather than business expenditure. Repeated personal use creates accounting and tax risk.
Do I need a VAT return if there was no activity?
If the company remains VAT-registered, a zero return may still be required according to its tax period. Check the current registration and tax period in MyTax/Vero.
Official sources
The following official or public sources were checked for this guide. Current authority instructions always take precedence.
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