ISK Tax 2026: 1.065% and Why Prop Traders Cannot Use It

General information about tax rules, not tax or legal advice. Rules change and every situation is different: check with a qualified adviser in your country before you file.

Two people in Sweden can put the same 800,000 kronor to work this year and pay wildly different tax on it. One holds index funds in an investeringssparkonto and pays roughly 5,300 kronor for the whole of 2026, win or lose. The other trades MNQ on a US futures account, makes the same money, and hands over thirty percent of it.

That gap is not a loophole anyone is exploiting. It is the deliberate design of two different systems, and the reason it matters to a futures trader is that almost every piece of Swedish personal finance advice you will read this year is written for the first person and silently assumes you are them.

Where 1.065 percent comes from

An ISK is not taxed on your profit. It is taxed on a notional yield, the schablonintäkt, calculated from how much capital sat in the account rather than from what that capital did.

The percentage is rebuilt every year from the government lending rate, the statslåneränta, as it stood on 30 November of the previous year, plus one percentage point, with a floor so it can never fall below 1.25 percent. On 30 November 2025 the statslåneränta was 2.55 percent, which makes the schablonintäkt for income year 2026 3.55 percent of the capital base.

That schablonintäkt is then taxed as ordinary capital income at 30 percent. Thirty percent of 3.55 gives you 1.065 percent of the capital base, which is the number people mean when they say "ISK costs one percent". Skatteverket sets out the whole calculation on its ISK page.

Worth keeping the years straight, because this is where half the confusion online comes from. The return you file in spring 2026 covers income year 2025, and that year used 2.96 percent with a 150,000 krona free level. The 3.55 percent and the 300,000 free level are for income year 2026, which you declare in spring 2027.

How the capital base is built

The kapitalunderlag is not your year end balance. Skatteverket takes the value of the account on 1 January, 1 April, 1 July and 1 October, adds every deposit made during the year, and divides the total by four.

Read that again if you move money around. Deposits count in full, and they count no matter when they arrive. Someone who pays in 100,000 kronor in November and takes it out in December has still added 25,000 to that year's capital base. For an investor who drip feeds a fund every month this is a rounding detail. For anyone who cycles capital in and out of an account, which is exactly what an active trader does, it is not.

The 300,000 krona floor, and what it is worth

From 1 January 2026 the tax free base level rises to 300,000 kronor, up from 150,000 in 2025. It covers your combined holdings across ISK, kapitalförsäkring and PEPP products, not 300,000 per account, and it arrives as an automatic deduction in the capital income category rather than as something you claim.

What that does to the effective rate:

Capital base 2026	Taxable part	Schablonintäkt at 3.55%	Tax at 30%	Effective rate on the whole account
300,000 kr	0 kr	0 kr	0 kr	0%
500,000 kr	200,000 kr	7,100 kr	2,130 kr	0.43%
800,000 kr	500,000 kr	17,750 kr	5,325 kr	0.67%
2,000,000 kr	1,700,000 kr	60,350 kr	18,105 kr	0.91%
10,000,000 kr	9,700,000 kr	344,350 kr	103,305 kr	1.03%

The 1.065 percent is a ceiling you approach, never the rate you actually pay. And the part everyone forgets: it is charged in a year when the account fell thirty percent, exactly as it is charged in a year when it rose thirty percent. Losses inside an ISK are not deductible. Neither are fees. You have swapped the right to deduct anything for a low, flat, predictable charge.

What an ISK is legally allowed to hold

This is defined in the act on investment savings accounts, SFS 2011:1268, and it is narrower than most people assume in one direction and wider in another.

Permitted assets, the investeringstillgångar, are cash plus financial instruments admitted to trading on a regulated market, or on an equivalent market outside the European Economic Area, or traded on an MTF platform, plus units in a värdepappersfond or a specialfond. Instruments in a company where you hold ten percent or more of the votes or capital are excluded, along with qualified shares, and if a holding becomes disqualified it can only stay on the account for a short window before it has to go.

Notice what that definition does and does not say. It does not say "shares and funds only". A standardised derivative listed on a regulated market sits inside the wording, which is why exchange traded index options and warrants show up on ISKs in Sweden all the time. The wording even reaches markets outside the EEA that are recognised as equivalent.

The other half of the rule is the account provider. Only a Swedish securities firm, credit institution or fund company, or an EEA firm with the right authorisation, can operate an ISK. Which brings us to the actual, boring, non legal reason a CME futures trader cannot use one: no Swedish ISK provider offers you a cleared CME futures account. The obstacle is not the statute, it is that the two product worlds do not overlap. Your ISK lives at a Swedish bank or platform. Your MNQ position lives with a clearing member in Chicago. There is no bridge, and none of the Swedish platforms has any commercial reason to build one.

What futures actually cost in a normal account

Trade your own money through an ordinary custody account and you are in inkomstslaget kapital at a flat 30 percent on the net result. Simple enough. The detail that costs Swedish futures traders real money is where each contract lands on the K4 form, because the loss rules differ by section.

Skatteverket's guidance on terminer is explicit that a futures contract is taxed according to the rules for its underlying, and that the average cost method does not apply, so you choose which contracts you are closing against. The reporting split runs roughly like this:

Contract type	K4 section	Practical effect on losses
Listed equity and equity index futures (the ES and NQ family)	A	Offsets in full against gains on listed equity related instruments
Listed interest rate futures	C	Own section, its own netting
Currency futures	C	Own section, its own netting
Commodity futures (crude, gold, the CL and GC family)	D	Only a reduced share of a net loss carries through to capital income
Unlisted equity and interest rate futures	D	Same reduction

The practical consequence is easy to miss and hard to undo. A trader who runs index futures and commodity futures in the same year is filing into two different loss regimes, and a losing year in crude does not shelter a winning year in the S&P the way instinct says it should. If your year is likely to be mixed, know which section each instrument falls into before December rather than in April, and check the current quota and the tax reduction rules for a net capital deficit with Skatteverket, because those percentages are set in law and have been adjusted in recent years.

Two housekeeping points that are boring until they are not. First, everything on a K4 goes in kronor, and a dollar denominated account means every closed position has to be converted. Decide the date convention with your adviser once and apply it to every line, rather than converting a year end total and hoping. Second, a US futures broker files nothing with Skatteverket, so the prefilled declaration that lands in your inbox will show your Swedish bank interest and nothing about your trading year. Skatteverket's overview of derivat is the starting point for which category each contract falls into, and your own export is the only record of what happened.

The two systems, side by side

Take 800,000 kronor of working capital and a year that goes reasonably well.

	ISK holding funds	Depå trading futures
What is taxed	The capital base	The realised result
Rate	1.065% of the base above 300,000 kr	30% of the net gain
Tax on a +200,000 kr year	5,325 kr	60,000 kr
Tax on a flat year	5,325 kr	0 kr
Tax on a -200,000 kr year	5,325 kr	0 kr, plus a deductible loss
Losses deductible	No	Yes, subject to section rules
Fees deductible	No	Built into the result
Reporting	Prefilled by the provider	K4, by you, line by line

The shape of it is the point. The ISK is cheap when you win and expensive when you lose. The custody account is the reverse. A buy and hold investor with a positive expectation over decades is obviously better off in the first column, which is exactly who the ISK was built for and why Sweden has one of the highest rates of retail equity ownership in Europe.

A leveraged futures trader is the shape the ISK was never designed to accommodate, and there is a real irony in it: the trader keeps a small cash balance and controls a large notional, so a capital base charge would be almost free for them. The system that would suit them best is the one the plumbing keeps them out of.

What to actually do with this

Nothing in here is an argument for or against trading futures. It is an argument for knowing which box your money is in before the money exists.

• Do not mix the two in one head. Long term savings belong in an ISK where the 300,000 floor and the flat charge do their job. Trading capital belongs in an account where losses count. They are different pots with different rules and they should not share a mental budget.
• Fill the 300,000 before you do anything clever. It is a genuine zero, it covers ISK, kapitalförsäkring and PEPP together, and it doubled in 2026. Not using it is leaving something free on the table.
• Keep your own trade log. A US futures broker sends Skatteverket nothing. The prefilled return will be silent about your futures year, and silence is not the same as nothing to declare. Export fills, keep statements, reconcile in kronor.
• Recheck the percentage every January. The schablonintäkt is rebuilt from the statslåneränta each year. The 3.55 percent in this article is the 2026 figure and it will be a different figure in 2027.

Leveraged futures can lose you more than you put in, and no account structure changes that. Tax optimisation applied to a strategy that does not work is just a cheaper way to lose.

This article is general information about Swedish rules as they stand for income year 2026 and it is not tax or legal advice. Rates, thresholds and reporting rules change, so confirm your own position with Skatteverket or with a Swedish tax adviser before you act on anything here.

isk tax 2026

Educational content, not investment advice. Trading futures involves substantial risk of loss and is not suitable for every investor. Any reference to Algomyth results is hypothetical, simulated over historical data, and shown in full on the performance page; past performance does not guarantee future results.