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 final law provides the ordinary 10% regime, the indexed personal annual exemption and deduction of matching realised losses. Circulaire 2026/C/74 confirms EUR 10,000 for income year 2026, assessment year 2027. Apply those provisions to the taxpayer’s confirmed category and all covered financial assets, rather than treating the allowance as a transaction expense.

Same-year private offset does not mean carryforward

Article 102(5) restricts recognised losses to the same taxpayer, taxable period and statutory category. It does not create a general carryforward for normal private financial-asset losses. An unused 2026 loss cannot automatically reduce a 2027 gain.

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. Suppose a reward creates EUR 1,000 of receipt income and is later sold for EUR 700. Only if its acquisition basis for the applicable later-disposal regime is separately confirmed at EUR 1,000 does this example give a EUR 300 capital loss, ignoring fees. The previously taxed receipt value alone does not establish that basis for every Belgian reward: document how the asset was acquired and verify the relevant rule. 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. preserve fees for reconciliation, but do not deduct them in the normal private 2026 gain or loss formula;
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.

A loss below the snapshot is different from an old loss

Sam is a full-year Belgian resident whose transactions belong to the normal private financial-asset category. Sam bought an entire crypto position before 2026 for EUR 30,000. Its evidenced 31 December 2025 value was EUR 20,000. In a fictional 2026 sale, Sam receives EUR 18,000 gross and pays EUR 180 in fees.

The lifetime price decline is EUR 18,000 − EUR 30,000 = EUR 12,000 loss. But the new regime’s recognised post-snapshot loss is only EUR 18,000 − EUR 20,000 = EUR 2,000 loss. The higher historical purchase price does not enlarge that loss, and the EUR 180 fee is not added to it. Article 102 expressly bases losses on old assets on the snapshot value.

If the same realised loss occurred in 2027, it would not reduce the EUR 16,000 gain from 2026. If the matching annual category total were negative, there would be no unused private loss to carry into the next year under this rule. The EUR 10,000 exemption is applied after matching qualifying results; it is not another loss and cannot create a negative amount against salary.

Sam should attach the purchase invoice, year-end quantity and price evidence, actual sale statement and a list identifying the other gains’ legal category. A lost key, scam payment or collapsed exchange claim needs its own analysis of the asset and a realised event; a dashboard valuation of zero is insufficient on its own. The enacted Article 102(5) and reproduced FOD circular, paragraphs 171–176, explain the snapshot and category limits.

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 9 October 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.