1.7.2026 · Carl-Johan Westerlund · entrepreneurship · 5 min read

Sole-Trader Bookkeeping in Finland 2026: VAT, Expenses and Tax Return

A practical guide to toiminimi bookkeeping in 2026: single or double entry, the Finnish VAT threshold and rates, deductible expenses, the business tax return and software choice.

A Finnish sole trader (toiminimi) must keep records of business activity even though the entrepreneur and business are not separate legal persons. The bookkeeping must show sales excluding VAT, business expenses, VAT charged and deducted, taxable business profit and withdrawals for private use.

The lightest lawful method may be enough for a very small side business, but monthly records quickly become valuable when the business is VAT-registered, buys services abroad, has many receipts or plans to incorporate.

This is general 2026 guidance, not individual tax advice.

Single-entry or double-entry bookkeeping?

Single-entry records follow income and expenditure. Double entry records both sides of every transaction and produces a balance sheet showing assets, liabilities and equity.

Under the Finnish Accounting Act, a private trader may keep single-entry books when no more than one of these limits was exceeded in both the completed and preceding financial year:

Limit	Threshold
Balance-sheet total	Over EUR 100,000
Revenue or comparable income	Over EUR 200,000
Average employees	Over 3

If at least two limits are exceeded in both years, double-entry and financial-statement requirements apply. Verify the precise rule for your circumstances, particularly around starting, ending or changing the business.

Double entry can still be the sensible choice below the thresholds. It gives a clearer view of the bank, receivables, payables, VAT and business equity, and makes a later move to an Oy easier.

The monthly routine

Even if the VAT period is quarterly or annual, review each month:

all bank and card events
sales invoices, payments and credit notes
purchase invoices and receipts
personally paid business costs
private withdrawals and private purchases from the business account
VAT on sales and deductible VAT on purchases
open invoices and unusual transactions

A bank line is not the same as a receipt. It proves that money moved, not what was bought, the applicable VAT or the business purpose.

VAT in Finland in 2026

A business with VAT-liable turnover above EUR 20,000 in a calendar year is generally required to enter the VAT register. The threshold is based on turnover, not the bank balance. If it is exceeded during the year, liability generally begins from the point the threshold is crossed; late registration may be applied retrospectively.

The main 2026 rates are:

Rate	Typical scope
25.5%	Most goods and services
13.5%	Food, restaurant services, books, medicines, passenger transport, accommodation and several cultural/sports services
10%	Newspapers and periodicals
0% or exempt	Certain cross-border supplies or exempt sectors, subject to their conditions

The reduced 14% rate became 13.5% on 1 January 2026. Check old invoice templates and recurring products.

Older guides may mention Finnish small-business VAT relief (alarajahuojennus). It is not available for accounting periods beginning on or after 1 January 2025, though old periods have their own claim rules.

A business with calendar-year turnover of no more than EUR 500,000 can generally use cash-basis VAT if the conditions are met: sales VAT is reported when payment is received and purchase VAT when the invoice is paid. The method must be used consistently and supported by the software.

Deductible business expenses

The basic income-tax rule is that an expense must relate to earning business income. Common categories include software and payment services, work equipment, marketing, professional training linked to the existing business, workspace, documented business travel, insurance and professional memberships.

Keep three concepts separate:

Income-tax deduction: reduces business profit.
VAT deduction: reduces VAT payable when the purchase supports VAT-deductible activity and other conditions are met.
Private use: must be excluded or apportioned.

If you are not VAT-registered, purchase VAT is not reclaimed on a VAT return and normally remains part of the expense for income-tax purposes. If VAT is deductible through the VAT return, the net amount is generally the income-tax expense.

Fines and penalty-type payments, the entrepreneur’s own work, private withdrawals and “salary” paid to oneself are not normal deductible business expenses. A toiminimi owner does not pay salary to themselves; cash taken for personal use is a private withdrawal and business profit is taxed under the personal tax rules.

The business tax return

The toiminimi files the business tax return (form 5) using the bookkeeping. Typical inputs include VAT-exclusive revenue, other income, purchases and outside services, payroll if any, operating expenses, depreciation, vehicle and workspace information, and relevant assets, liabilities and private transactions.

Do not build the return from memory in spring. If each month is closed, the return is largely a review of the records plus tax-specific adjustments. Check the exact deadline in MyTax for the relevant tax year.

Do it yourself, outsource or use a hybrid?

Model	Best fit	Main risk
Do it yourself	Few simple transactions and enough knowledge of VAT	Errors discovered only at return time
Accounting firm	VAT, foreign purchases, payroll or time pressure need expertise	Cost rises if material is late or unclear
Hybrid	Entrepreneur invoices and captures receipts; software and accountant review	Responsibilities must be explicit

A hybrid often works well for a growing toiminimi: the owner retains visibility while the accountant reviews VAT, accounts, the tax return and exceptions.

What software should provide

Look for bank import, mobile and email receipt intake, sales invoicing, VAT rates including 25.5%, 13.5% and 10%, cash-basis VAT support where used, missing-document status, account-coding proposals, accountant access and tax-return-ready reports.

Ask one practical question: on the twelfth day of the month, can you immediately see what is missing, what needs approval and the current profit? If not, the software is storing data rather than guiding the bookkeeping process.

Common mistakes

Following the EUR 20,000 VAT threshold from cash in the bank rather than turnover.
Deducting purchase VAT when sales do not give a right to deduction.
Calling a private withdrawal “salary”.
Keeping only card slips or bank screenshots instead of purchase evidence.
Mixing the software subscription with the accounting firm’s service price.
Waiting until spring to reconcile the year.