ISK vs KF vs AF: Swedish investment accounts, explained

The three accounts, in one paragraph each

Sweden gives you three ways to hold investments, and the choice matters more than most fund decisions. An ISK (investeringssparkonto) taxes you a small flat amount on the account's value each year and then leaves you alone — no capital-gains tax, no forms. A KF (kapitalförsäkring) does the same maths inside an insurance wrapper, with different ownership and inheritance mechanics. An AF (aktie- och fondkonto, the ordinary depå) is the old-fashioned version: no tax until you sell, then 30% on the gain.

The facts below are verified against Skatteverket as of July 2026. Rules change — before acting on anything here, check the current figures at skatteverket.se.

ISK: flat tax on value, then silence

The ISK's schablon (standardised) taxation works like this. Your capital base is the average of the account's value at the start of each quarter, plus deposits during the year. That base is multiplied by the government borrowing rate (statslåneräntan) as of 30 November the prior year plus 1.00 percentage point, with a floor of 1.25%; the result is taxed as capital income at 30%.

For 2026 the numbers are: SLR of 2.55%, so a schablon rate of 3.55%, so an effective tax of about 1.065% of your capital. On a 400,000 SEK base that would be roughly 4,260 kr — except that from 2026 the first 300,000 SEK per person is tax-free (150,000 in 2025), applied automatically and shared across your ISK and KF accounts combined. So the 400,000 SEK account actually pays schablon tax on 100,000, about 1,065 kr.

What you get in exchange: no capital-gains tax ever, no K4 declaration, and you can trade as much as you like without tax consequences. What you give up: losses are not deductible — the flat tax arrives in bad years too. You legally own the shares, which means you keep voting rights and shareholder status.

KF: same tax, different owner

A kapitalförsäkring is taxed at the same effective rate — 1.065% of capital for 2026, formally called avkastningsskatt — and the 300,000 SEK allowance covers it too, from the same shared pot. The insurer deducts the tax inside the account, so nothing appears in your own declaration.

The structural difference is ownership: the insurance company legally owns the shares, and you own a claim on the insurer. You lose voting rights. You gain a beneficiary designation — you can name who receives the account at death, outside the ordinary estate process, which makes KF the more useful wrapper for inheritance planning.

The practical difference that decides most cases is foreign withholding tax, covered next.

The US-dividend question: where withholding tax goes to die

The US withholds 15% of dividends paid to Swedish investors under the tax treaty. Whether you get that back depends on the wrapper.

In a KF, the insurer reclaims the foreign withholding on your behalf, as the legal owner. The large Swedish insurers have this process running at scale, and it is generally the most reliable route to recovering the full 15% on US dividends.

In an ISK, the credit is automatic in your tax assessment but capped at the schablon tax you owe that year; the excess carries forward up to five years. Here the 300,000 SEK allowance cuts both ways — it shrinks your schablon tax, which shrinks the cap. A dividend-heavy US portfolio in an ISK can therefore pay withholding it never fully recovers. The practical rule: heavier US-dividend portfolios often sit better in a KF.

AF: the ordinary depå

The AF has no wrapper magic. Dividends and realised gains are taxed at 30%, you file the K4 form for every sale, and losses are deductible — first directly against gains, then at a 70% quota against other capital income. Nothing is taxed until you sell, so tax on gains can be deferred indefinitely.

That deferral is the AF's one genuine advantage, and it matters in two situations: holdings you expect to return very little, and holdings you intend never to sell.

Side by side

Aspect	ISK	KF	AF
Tax model	1.065% of capital (2026), after shared 300k allowance	Same rate, deducted by insurer	30% on realised gains and dividends
Legal owner / voting	You / yes	Insurer / no	You / yes
Foreign withholding tax	Credit capped at schablon tax; 5-year carry-forward	Insurer reclaims — most reliable for US dividends	Creditable in declaration
Declaration and losses	No K4; losses not deductible	Nothing to declare; losses not deductible	K4 required; losses deductible (70% quota)

When each account wins

The break-even arithmetic for 2026: ignoring the allowance, a schablon account beats the AF when your expected annual return exceeds roughly 3.55% — the point where 30% of the return equals 1.065% of capital. The allowance moves that bar down. At a 500,000 SEK portfolio, only 200,000 is taxed, so break-even falls to about 1.4%; at 1 MSEK it is about 2.4%.

For most equity investors expecting anything like historical stock returns, ISK or KF wins comfortably. The AF earns its place for low-return holdings, or for a strict buy-and-never-sell approach where deferral compounds for decades and losses may need harvesting.

One cost that lives outside the tax code: Swedish brokers typically charge around 0.25% currency conversion on foreign trades, each way. Some offer currency accounts that reduce this. On a portfolio traded in dollars, this quiet fee can rival the schablon tax itself.

Where I stand

I hold my Swedish-side investments in schablon accounts, because I expect equity returns well above the break-even and I want no K4 in my life. Which wrapper fits you depends on your dividend mix, your inheritance situation, and your holding period — and, again, on what Skatteverket says the year you read this, not the year I wrote it.