Bookkeeping for Finnish toiminimi side-hustlers
If you run a toiminimi alongside another job — a few hundred to a few thousand euros a year, in a niche that doesn’t involve VAT — your tax life is simpler than the SaaS market makes it look. This piece walks through what you actually need to track and what you can skip.
What you legally have to do
Finnish sole proprietors with revenue under 20 000 € fall under muistiinpanovelvollisuus — the lightest record-keeping regime. You’re not required to do double-entry bookkeeping. You’re required to keep notes: who you bought from, when, how much, and proof (the receipt).
The output you owe Verohallinto each spring is one document: Form 5 (lomake 5), elinkeinotoiminnan veroilmoitus. It’s a single page that summarises your business income and deductions for the year. Nothing else.
What you don’t have to do
- Monthly closing. There’s no monthly close cycle for a toiminimi.
- Double-entry bookkeeping. Useful if you’re running several limited companies. Overkill for a side hustle.
- An accountant. Helpful if you have payroll, VAT, or complex deductions. Not required if you don’t.
- Quarterly VAT filings. If your revenue is under the 20 000 € threshold and you haven’t voluntarily registered for VAT, you don’t file VAT.
- A separate business bank account. Recommended for sanity, not legally required.
What you do have to do
- Keep every receipt. Physical or digital. The receipt is the proof; the line in your books without the receipt is just an assertion.
- Categorise expenses to Form 5 lines. Every euro you deduct goes on a specific line. Get that mapping right at capture time and February is uneventful.
- Track multi-stream income separately if you have it. If your Y-tunnus runs more than one business line — say, tattoo work and psychology consulting — keep them separately tagged. They roll up to one Form 5 but you want per-stream visibility during the year.
- Handle equipment depreciation correctly. Anything over ~1 200 € is typically depreciated, not expensed in full the year you buy it.
- File Form 5 by the deadline. Usually around early April. OmaVero pre-fills almost nothing for business income — you fill it in.
What’s not on Form 5 (and where it goes instead)
- Personal income tax. Stays where it always was — in your regular veroilmoitus. Form 5 produces a result that flows there.
- YEL. Your YEL pension contribution comes off your taxable result; it’s a separate form/decision.
- VAT. Not on Form 5 if you’re under threshold and unregistered.
A practical workflow that works
- Capture each receipt the day you get it. Photo of paper, forward of email — whatever’s friction-free.
- Tag stream + Form 5 category at capture. This is the single most expensive thing to defer.
- Reconcile once a month: are there any uncategorised receipts? Any subscriptions that haven’t shown up?
- In late February, run an export. Cross-check totals against your bank statement.
- Type the totals into OmaVero. Done.
Where Tiny Books fits
Tiny Books is a small tool for exactly this loop — capture, tag, export, file. It doesn’t replace a tilitoimisto if you have payroll or VAT or multiple owners. It replaces the spreadsheet-and-shoebox workflow that you’ve been promising yourself you’ll improve since 2019.