Toiminimi bookkeeping for platform workers: a plain-language tour

If you’ve registered (or are thinking of registering) a toiminimi for platform work in Finland — Wolt, Bolt, Uber, salon work between shifts, weekend tutoring — bookkeeping is the part most new entrepreneurs leave to “figure it out later”. This article is the version of “later” that takes about ten minutes and saves a lot of pain in spring.

There’s no product pitch here. The whole point is: by the end you should be able to decide whether any tool is right for you (us, an accountant, an Excel sheet) — based on what Finnish law actually requires.

What “bookkeeping” means for a toiminimi

In Finnish law, every business — including a one-person toiminimi — has to keep books. For a toiminimi the regime is single-entry bookkeeping (yhdenkertainen kirjanpito), which is the lighter of the two options. It means:

• Every business income and every business expense is recorded with a date, an amount, a counterparty, and a category.
• A receipt or other voucher (a tosite) is kept for each entry.
• The books are kept up to date through the year, not reconstructed at year-end.
• Vouchers are retained for 6 years from the end of the calendar year in which the financial year ended (Accounting Act, chapter 2, section 10).

The financial year for almost every toiminimi is the calendar year. So your 2026 books need to be kept until end-of-2032.

That’s it for the headline rules. The rest is detail — and most of the detail is about what counts as a business expense and what doesn’t.

What Vero actually wants from you

Three different filings, three different deadlines:

1. VAT return (arvonlisäveroilmoitus) — only if you’re VAT-registered. Submitted in OmaVero, for the period you are on (the default is the calendar month; with small turnover it can be a quarter or the calendar year). For a calendar-year period, the return and payment are due at the end of the following February; check the current date on Vero.
2. Personal tax return (henkilökohtainen veroilmoitus) — every spring. The toiminimi’s profit (revenue minus deductible expenses) flows into the personal return as business income.
3. Advance tax (ennakkovero) instalments — through the year. Vero estimates your annual tax based on your declared expected income; you pay it in instalments.

If you’re not VAT-registered (turnover at most €20,000 in both the current and previous calendar year), filing is just the personal return and the advance-tax instalments. That’s the situation for many couriers in their first year.

Where new entrepreneurs lose money

Three patterns we see in conversations with platform workers:

1. Receipts that disappear. Fuel receipts in glove boxes, dinner receipts in pockets, app subscriptions buried in email. Every euro of legitimate business expense you can’t prove is a euro of higher taxable income. The Bookkeeping Act’s tosite rule is unforgiving — no receipt, no deduction.

2. Surprise advance tax in spring. Vero estimates your annual tax based on what you told them at registration. If you start earning more than that estimate (a good year), the advance-tax instalments are too small. You pay the difference (jäännösvero) in spring, and it can be a big number for a courier who didn’t plan for it.

3. Crossing the €20,000 line without noticing. If you cross €20,000 turnover in a calendar year, you’re VAT-liable from the moment you cross. The sale that takes you over is fully taxable, and a late registration is recorded from the crossing date, so your first returns may already be late. (Until the end of 2024 the rule was harsher: the line was €15,000 and liability reached back to 1 January.) The cure is just to watch the running total — but most people only check at year-end.

The boring answer is the right one

Real bookkeeping for a platform worker doesn’t need clever tools. It needs three habits:

• Write down every shift the day it happens. Earnings, hours, kilometres. Even if the platform does a weekly payout, knowing your daily figures means you’ll never be surprised by what arrives in the bank.
• Snap every receipt the moment it’s printed. If it took you 30 seconds at the petrol pump, it’s done. If it has to wait until you’re home, it’s a coin flip.
• Reconcile against the bank once a month. Match your shift earnings against the platform payouts that hit your account. Match your expense receipts against the cards you spent on. Mark anything personal as out-of-scope. Done.

That’s the whole job. The part that varies is how you do it:

• A notebook and a folder of paper receipts is legal and will work.
• An Excel sheet with photos in a Drive folder is also legal and will work.
• A bookkeeping app — ours, or one of the established Finnish tools (Procountor, Holvi, etc.) — is what most people gravitate to once they realise how much repetitive ledger work it saves.

A kirjanpitäjä (accountant) is on top of any of these. Most accountants charge €30–€50/month for a toiminimi at platform-worker volume. Many platform workers do their own day-to-day and bring in a kirjanpitäjä once a year for the personal tax return.

What “live bookkeeping” buys you

If you do go the app route, the practical advantage is real-time visibility on three things you’d otherwise only see in spring:

• Where you stand against the €20,000 VAT line. Knowing in March that you’re at 60% lets you plan calmly. Discovering it in December is panic.
• Where you stand on YEL income. The pension insurance that becomes mandatory when your estimated work income reaches the YEL floor (€9,423.09 in 2026, plus the other YEL conditions) is one of the larger expenses for a working courier. Knowing your run-rate matters.
• What your actual deductions add up to. Without a tidy shift log, a kilometre deduction is easy to under-record.

None of these are unique to any one app — but if you’re going to use a tool, those are the metrics worth checking it can show you, today, on real data.

How to choose

Before signing up to anything, ask three honest questions:

1. Do I have time and discipline to keep paper or spreadsheet books for 12 months? If yes, those are perfectly legal and you save money.
2. Do I want to learn enough Finnish tax to file my own returns, or do I want a kirjanpitäjä to handle the year-end? Either is fine — they cost different amounts.
3. Will I actually use the tool? A tool you ignore is worse than no tool. Pick the one you’ll open between shifts, even if it’s just a notebook.

For most platform workers we talk to, the honest combination is: a phone app for the day-to-day (because it lives where the receipts and shifts happen) and a once-a-year hour with a kirjanpitäjä for the tax return. That covers cost-effectiveness without requiring you to learn the entire tax code.

Where to read next

• The €20,000 VAT line — what it means and how to plan around it — the most consequential number in your first year.
• GigBooks documentation: Welcome — what our app actually does, plainly.
• Accountant or app calculator — compare the cost of the options.
• Sources: Vero — advance tax, Vero — VAT period changes, Työeläke.fi — when do I need YEL, Finlex — Kirjanpitolaki 1336/1997.
• Verohallinto’s guide for sole traders — the official source on tax. Boring, but accurate.

Whatever you pick: keep your receipts, watch the line, and don’t leave it to spring. That’s 80% of the job done.