Finland online casino tax rules have shifted after the country’s Supreme Administrative Court rejected the way the tax authority had been charging players on winnings from slots run outside the European Economic Area. The court ruled that tax must be worked out for each session of play rather than for every individual game, and that stakes on losing games within the same session can now be deducted. The decision was first reported on 14 August 2026 by Taloustaito, the magazine of the Finnish Taxpayers’ Association, and it matters for the many Finnish players who use offshore sites licensed in places such as Curacao.

What has happened?

Under Finnish law, winnings from gambling organised inside the EEA are in principle tax-free, while winnings from Curacao-licensed and other non-EEA operators count as taxable earned income. The dispute was about how that taxable income should be measured. The Tax Administration had treated each spin, or each game, as a separate taxable event, which meant a player could be taxed on gross wins with no allowance for the money staked on the spins that lost.

The Central Tax Board had already softened that stance by letting players deduct the stakes on winning games. The Supreme Administrative Court went further. In a ruling reached narrowly by three votes to two, it held that stakes on losing games can also be deducted, provided those games belong to the same session of play. Miika Harkonen, a tax lawyer at the Finnish Taxpayers’ Association, said the central point was that the court did not accept the idea that every game should be examined as a completely separate event. According to Harkonen, the dissenting judges would have gone even further on the right to deduct.

What the Finland online casino tax ruling changes

The practical effect of the Finland online casino tax ruling is that taxable income from non-EEA online slot play is now assessed per session, not per game. That is a meaningful change for anyone who plays long sessions with a mix of winning and losing spins, because the losing stakes inside a session can be set against the wins for the first time.

There is an important limit. Losses from one session cannot be offset against profits from another. As the Finnish iGaming lawyer Antti Koivula, chief compliance officer at Hippos ATG, pointed out, a player can still end a period of play down overall and yet owe a considerable tax bill. The relief reduces the arithmetic in the player’s favour within a session, but it does not turn gambling losses into a general deduction across the year.

Why this matters for players

For Finnish players, this is a rare piece of clarity on a question that has caught many people out. Playing on non-EEA sites is common in Finland, and not every player has understood that winnings from those sites are taxable at all. Veikkaus, the state operator, has previously estimated the volume of gambling outside the official system at 600 million to 900 million euros a year, so the group affected is large.

The ruling also opens the door to backdated claims. Players who were taxed on a game-by-game basis can file a claim for adjustment going back up to three years, which in 2026 can still reach the 2023 tax year. Anyone who paid tax on offshore online slots winnings under the old method may want to check whether they are due a correction. This is a tax matter rather than gambling advice, and players with a significant bill should take proper tax guidance rather than rely on a news summary.

EEA licensing versus offshore sites

The case is a useful reminder of why the licence behind a casino matters. The whole tax distinction turns on whether a site is organised inside the EEA or outside it. Sites licensed in Malta and other EEA jurisdictions sit in a different position from Curacao-licensed operators, both for tax and for player protection. Licensing affects how complaints are handled, how withdrawals and identity checks work, and what recourse a player has if something goes wrong.

For players weighing where to put their money, it is worth understanding the difference between safe, licensed casinos and offshore brands, checking the casino licence before depositing, and considering MGA-licensed casinos where an EEA licence brings clearer consumer safeguards. None of this is about avoiding tax. It is about knowing the rules that apply to the site you choose.

What players should watch next

Two things are still unsettled. First, the Tax Administration has to publish new guidance, and the exact boundaries of a session of play are not yet defined. Harkonen’s own view is that games with a clear connection in time and function, even with short breaks, would count as one session, while the same activity a week later would be a separate session. Until the guidance lands, the scope of the deduction will be decided case by case.

Second, a separate Supreme Administrative Court ruling on the taxation of professional betting is expected shortly, turning on whether losing bets can be deducted and whether systematic, profitable betting counts as business activity. Both points sit against the backdrop of Finland’s licensed online market, which is due to open on 1 July 2027 and will change the landscape again for players who currently use offshore sites.

Betspin view

This ruling is a small win for fairness. Taxing a player on gross winnings while ignoring the stakes on losing spins never reflected how slots actually work, and the court has brought the treatment closer to the principle that tax should fall on net income. The limits still bite, and a losing player can still owe tax, so the change is not a green light to chase losses. Our steady advice does not change: understand the licence behind any casino, know the rules that apply to your winnings, and use the responsible gambling tools available to you. Clearer tax treatment is welcome, but it is no substitute for playing within limits you have set for yourself.