Small power producers: threshold in figures, fuel returns taxable

Vero's guidance page on special filing situations for small electricity producers (Sähköveron ilmoittamisen erityistilanteita – sähkön pientuottaja) now states the annual production threshold as a figure — 800,000 kWh per power plant (800 000 kWh/voimalaitos)Vero — in both re-registration scenariosVero, and adds a new caution (Huom.)Vero with an operative correction dutyVero: fuels that small producers use in electricity generation are taxableVero, so electricity-return corrections must be mirrored in the fuel returns, which are filed monthlyVero.

The threshold figure itself comes from the Excise Act: a pientuottaja is an electricity producer whose plant generates at most 800,000 kWh per calendar year (Laki sähkön ja eräiden polttoaineiden valmisteverosta 1260/1996, section 2(5b))Finlex. The page text is otherwise unchanged. If a registered small producer's annual output exceeds the threshold mid-year, it must re-register as an electricity producer retroactively for the whole calendar year; the producer then follows the producer schedule — calendar-month tax periods with a regular return for each — files the missing early-year returns at once (those already late attract a late-filing charge, myöhästymismaksu), and observes the running deadlines (May by 12 July, June by 12 August in the worked example where the threshold is crossed on 1 July 2026).

Conversely, a registered electricity producer that realises mid-year its output will stay below the small-producer annual threshold must re-register as a small producer from the start of the current calendar yearVero, correct the producer returns already filed by submitting replacement returns with the taxable products removed, and then file as a small producer: the tax period is the calendar year, with returns and payment due by 12 February of the following year (12 February 2027 for 2026 in the example where the shortfall is noticed on 1 October 2026, correcting periods 01–07/2026).

The new note attaches to exactly this downward correction path.Vero Because the fuels small producers burn to generate electricity remain taxable, a producer correcting its electricity returns must make the corresponding corrections to its fuel returns at the same timeVero — and those fuel returns run on a monthly cycle, not the small producer's annual oneVero.

The cessation rules on the same page are untouched: a small producer ending activity and its registration mid-year treats the tax period as ending on the cessation date, with the period return due by the 12th day of the second calendar month after the cessation month (next business day if that date falls on a Saturday or holiday), and occasional activity in the same tax type follows the small-producer due date up to the cessation month.

For advisers to small producers, the practical additions are twofold: the 800,000 kWh-per-plant figure is now explicit in both re-registration passagesVero, and any downward re-registration correction now entails a parallel monthly fuel-return correctionVero.

Legal basis: Laki sähkön ja eräiden polttoaineiden valmisteverosta (1260/1996) 2 § 5 b kohta (800,000 kWh/plant small-producer definition); Vero guidance Sähköveron ilmoittamisen erityistilanteita – sähkön pientuottaja (re-registration, correction and fuel-return note).