ISK vs
Tjänstepension

An ISK (investeringssparkonto) is a Swedish investment savings account with a unique flat-rate tax model. Instead of paying capital gains tax on profits, you pay an annual schablonbeskattning – a small percentage of the account's total value, regardless of whether you made a gain or loss that year.

For 2026, the schablonintäkt is 3.55% of the capital base (the statslåneränta of 2.55% plus 1 percentage point), taxed at 30% capital tax – an effective annual drag of about 1.07%. From 1 January 2026 the first 300 000 kr is tax-free (a skattefritt grundbelopp shared across all your ISK and kapitalförsäkring accounts, raised from 150 000 kr in 2025) – so for savers below 300 000 kr the ISK tax is 0 kr. You also retain full liquidity – you can withdraw at any time without penalty.

Pension contributions (tjänstepension) are made before income tax, so you get an immediate tax benefit – the money invested is your gross amount, not your net. The capital grows completely tax-free inside the pension wrapper. There is no schablonbeskattning or capital gains tax during the accumulation phase.

The trade-off comes at withdrawal: pension payouts are taxed as regular income. Your marginal tax rate at retirement depends on your total income. For many retirees this falls between 30–35%, but it can be lower if pension income is modest. The key question is whether the upfront tax saving and tax-free growth outweigh the withdrawal tax. Note that this tool models withdrawal tax at a single flat marginal rate – actual Swedish taxation in retirement is progressive, so your real average tax may differ.

ISK tends to win when your expected return is high (7%+), your marginal tax at withdrawal will be moderate to high (above ~30%), or when you value liquidity and flexibility. The first 300 000 kr is entirely tax-free from 2026, the drag above that is about 1.07% per year, and you can access the money at any time.

Pension tends to win when your current marginal tax is significantly higher than your expected retirement tax. If you're paying state income tax (over the skiktgräns) and expect lower income in retirement, the upfront tax savings from pension can outweigh the eventual withdrawal tax. In practice, many advisors recommend maxing employer pension matching first, then investing additional savings in ISK for its liquidity and the 300 000 kr tax-free allowance.