Late VAT filing in Finland: what it costs and how to fix it

If a VAT return is filed after its deadline, Vero charges a late-filing penalty (myöhästymismaksu) of €3 per day, capped at €135 per return.

The cap is reached after 45 days. Being three days late costs €9. Being six months late costs the same €135 as being two months late.

That capped structure has an unhelpful psychological effect: once someone is badly late, the marginal cost of staying late looks like zero, so nothing happens. The cost of continued delay is not the penalty, it is everything in the next section.

Filing and paying are separate obligations with separate consequences.

VAT paid after the due date accrues late payment interest, which was 9.5% per year for 2026. Interest runs from the day after the due date until the day the payment lands.

Interest is charged on the outstanding tax, so unlike the filing penalty it is not capped. On a €1,500 annual VAT liability left unpaid for a year, that is around €140, and it keeps accruing.

This is why a courier who files on time and pays late is often worse off after a few months than one who did the reverse.

A separate and more serious charge, the tax increase (veronkorotus), applies where a return is materially incorrect or income has been left out rather than merely reported late.

The distinction that matters is between being late and being wrong. A late but accurate return attracts the late-filing penalty. A return that understates VAT can attract a tax increase calculated on the understated amount, which is a percentage rather than a flat fee and can be considerably larger.

Correcting an error yourself, before Vero raises it, is treated more favourably than having it found. That asymmetry is the entire argument for fixing things promptly.

In order:

• File the return, now, with the correct figures. Do not wait until you can pay.
• Pay what you can, using the correct reference number for that period.
• If you cannot pay in full, look at a payment arrangement rather than silence.

Filing stops the daily penalty accruing. Paying stops the interest. They are independent, so do whichever you can first rather than treating them as a package.

The instinct to wait until everything can be resolved at once is the single most expensive mistake here, because both meters keep running while you wait.

Finnish VAT corrections are made by submitting a replacement return for the period concerned, containing the full corrected figures. You are not editing the original or filing a difference.

Small errors can sometimes be handled in a later period, but the clean approach for anything material is a replacement return for the period where the error belongs.

If several periods are affected, each needs its own correction. Bundling a year of adjustments into one period is a common shortcut and it misstates every period involved.

If you have not filed for a long time, the position is more recoverable than it feels.

Each unfiled period carries its own capped penalty, so the total is bounded and predictable rather than open-ended. The interest on unpaid tax is the part that grows.

The practical route is to reconstruct the periods in order from the earliest, file them, and deal with payment separately. Platform earnings reports can usually be re-downloaded, which makes reconstruction feasible even when personal records are thin.

Coming forward voluntarily is materially better than being assessed. Vero's estimated assessments, made when you do not file, tend not to include deductions you never claimed.

For an ordinary small business that got behind and then fixed it, the answer is a penalty and interest, not prosecution.

The serious end of the scale involves deliberate concealment sustained over time, not a courier who did not understand the deadlines. Persistent non-filing does eventually escalate: estimated assessments, collection, and entries on the tax debt register, which is public and can affect your ability to get work or credit.

None of that is triggered by a first late return handled sensibly.