Crypto losses in Belgium in 2026: what can actually be offset?

Belgium's 2026 financial-asset capital-gains tax changes how private crypto gains and losses are documented. The law includes crypto-assets, taxes future gains under the general regime at 10% and permits qualifying capital losses within the same taxable period, but not as an unlimited carryforward. That does not create one universal crypto-loss pool: normal private investments, abnormal or speculative transactions and professional activity still require the correct legal category. A loss that is economically visible on an exchange is deductible only if the corresponding asset, disposal, period and category satisfy the Belgian rules.

The 2026 capital-gains regime includes crypto-assets

The Belgian Chamber records that the law introducing a tax on capital gains from financial assets was adopted in April 2026 and published on 21 April 2026. The government material expressly includes crypto-assets. The regime applies from 1 January 2026, so a 2026 report must distinguish value created before the new regime from taxable-period gains and losses.

The government's official explanation gives a general 10% rate, an annual allowance of EUR 10,000 under the applicable conditions and deduction of qualifying losses within the year. The final result depends on the enacted provisions and taxpayer profile; the report should not subtract the allowance as though it were a transaction fee or estimate final tax without the rest of the return.

Same-year private offset does not mean carryforward

The official coalition and legislative material describes deductibility for losses realised by the same taxpayer in the same taxable period and within the relevant taxable financial-asset category. It does not create an indefinite carryforward of unused private crypto losses. A net loss remaining after the 2026 calculation should therefore not automatically reduce 2027 gains.

The loss must be realised. A token that merely falls in value, an open perpetual position or a position snapshot does not create the private capital loss. A sale, exchange or other qualifying realisation needs proceeds, basis, date and ownership evidence. Transfers between the taxpayer's own wallets do not become loss disposals simply because one platform marks the withdrawal as a send.

The 2026 transition protects value accrued before the regime. This makes the 31 December 2025 reference value and evidence critical. The report must compare the statutory transition basis with actual acquisition information under the law rather than assume that every historical purchase price determines the taxable 2026 gain. An unsupported zero baseline can materially overstate a gain.

• identify assets held at the 2025 year-end;
• preserve exchange and wallet balances at the transition date;
• document the legally permitted reference value;
• separate acquisitions made from 1 January 2026;
• match losses only inside the permitted 2026 category;
• do not carry an unused private loss forward without a legal basis.

See the full Belgium crypto tax guide for the transition and return context.

Normal management, diverse income and professional activity

Belgium has long distinguished normal management of private wealth from abnormal or speculative operations and professional activity. The Ruling Service's published crypto cases consider the proportion of movable wealth invested, transaction frequency, holding period, financing, expertise and organisation. No single trade count decides the profile.

The 2026 capital-gains regime does not justify mixing every negative result across those categories. If a transaction falls under diverse income, determine the net taxable amount and deductible transaction-related costs under that regime. Do not transfer a private financial-asset loss automatically into salary, interest, staking income or an unrelated Article 90 item.

A genuine professional crypto activity uses business records and the rules for professional income. Expenses must be connected, evidenced and not already capitalised in inventory or transaction results. Professional losses and their possible carryforward follow business rules and conditions, not the new private same-year loss rule. The Belgian professional-trader guide explains the factual test.

Staking, mining, lending and DeFi receipts can also be income independently of a later token loss. A reward worth EUR 1,000 when taxable and later sold for EUR 700 can create receipt income and a separate EUR 300 asset result; deleting the receipt because the token declined is incorrect. Review the Belgium DeFi guide.

How to calculate a defensible 2026 crypto loss

For each realised disposal, identify the units, acquisition or transition basis, proceeds and direct disposal costs in euros. Exchange-level average entry prices are not enough where assets moved across platforms. Reconcile the complete wallet history before selecting units or applying the statutory method.

Illustrative same-year calculation

Assume a private taxpayer has a qualifying 2026 crypto gain of EUR 8,000 and a qualifying 2026 loss of EUR 3,000 in the same permitted category. Before considering the annual allowance and the rest of the law, the net category amount is EUR 5,000. If a second EUR 4,000 loss remains unrealised at year-end, it is not included. If the realised losses exceed gains, the report must not promise that the remaining amount can be carried to 2027.

This example is a mechanical workpaper, not a tax estimate. The allowance, transition, withholding/intermediary obligations and other financial assets can change the declaration.

1. convert each event to EUR at the event timestamp;
2. include fees exactly once;
3. exclude own-wallet transfers and open positions;
4. use the correct 2025 transition evidence;
5. group only legally compatible gains and losses;
6. reconcile totals to all financial assets on the return.

What the Belgian crypto report should show

The report should display realised gains and losses separately, the 31 December 2025 transition basis where applicable, and the selected factual activity profile. It should not silently apply the 10% rate to professional trading, carry losses forward or treat every DeFi movement as a disposal.

Use the Belgium exchange-report guide to consolidate exports. Retain transaction hashes, statements, EUR pricing, wallet ownership and manual classification decisions. Where the profile remains uncertain, a pre-filing adviser review—or an advance ruling for a future transaction where available—is more reliable than choosing the lowest rate in a dropdown.

Frequently asked questions

Official Belgian sources

• Belgian Chamber: enacted financial-asset capital-gains law dossier 56K1244
• Belgian government: crypto-assets, rate, allowance and same-year losses
• Belgian Ruling Service annual report: crypto classification cases

Reviewed 1 September 2026. The final filing must follow the enacted law and the taxpayer's complete Belgian facts.

Disclaimer: This article is for general informational purposes only and does not constitute tax advice. For individual tax advice, consult a licensed tax professional.