Is Koersa tax advice?

No. Koersa computes scenarios under each Belgian profile and shows where the numbers go on the declaration. Which profile applies to you is a question for your accountant; Koersa never decides it for you.

What changed in 2026?

Belgium introduced a 10% tax on realized capital gains on financial assets, crypto included, above EUR 10,000 per year. Gains from before 2026 stay out of scope through the 31/12/2025 valuation. The older speculative (33%) and professional regimes still exist.

Which exchanges are supported?

Kraken and Binance CSV exports today, and manual entry for anything else. Automatic API sync is on the roadmap.

Tracking your portfolio and seeing your tax verdict is free. The full breakdown, the declaration codes and the accountant PDF are part of the paid plan; you see the price before paying anything.

Ready for the 2026 capital gains tax

Declare your crypto gains painlessly. Compliant with Belgian rules.

Koersa turns your exchange history into a Belgian tax filing, ready to submit.

Free to start. No credit card.

How it works

From landing here to knowing what you owe, in minutes, not evenings.

1
Create a free account

No card, no commitment. You land in a working portfolio with sample data you can replace.
2
Add your trades

Drop your Kraken or Binance CSV export, or type trades in by hand. Re-imports never duplicate.
3
Read your verdict

Estimated tax owed, or likely nothing owed, under each Belgian profile. Then the breakdown, the declaration codes and the PDF for your accountant.

What Koersa does

The 2026 tax, computed correctly

10% above the EUR 10,000 exemption, with your pre-2026 gains shielded by the 31/12/2025 valuation and the more favourable basis picked lot by lot.

Declaration codes, pre-filled

Not just a number: the exact Cadre and codes to type into Tax-on-web, with the amount next to them.

A PDF your accountant can read

One document with the method, every disposal and its basis, in French, Dutch or English, independent of your app language.

A method you can defend

FIFO over your real trade history, every leg converted at the ECB rate of the trade date. The same inputs always give the same number.

Kraken and Binance imports

CSV or ZIP exports, trades deduplicated by exchange id. Swaps count as disposals, as the 2026 rules require.

Your data stays yours

Export everything as JSON at any time; delete your account and the whole history goes with it. No trackers, no ad cookies.

Frequent questions

Is Koersa tax advice?: No. Koersa computes scenarios under each Belgian profile and shows where the numbers go on the declaration. Which profile applies to you is a question for your accountant; Koersa never decides it for you.
What changed in 2026?: Belgium introduced a 10% tax on realized capital gains on financial assets, crypto included, above EUR 10,000 per year. Gains from before 2026 stay out of scope through the 31/12/2025 valuation. The older speculative (33%) and professional regimes still exist.
Which exchanges are supported?: Kraken and Binance CSV exports today, and manual entry for anything else. Automatic API sync is on the roadmap.
What does it cost?: Tracking your portfolio and seeing your tax verdict is free. The full breakdown, the declaration codes and the accountant PDF are part of the paid plan; you see the price before paying anything.

I'm building Koersa because declaring my own crypto in Belgium was a nightmare. - Adrien

Know your number before the fiscus asks

Free to start, no card. Your first estimate takes less time than finding your bank card.