Realized vs Unrealized Crypto Gains

"My portfolio is up, do I owe tax?" Usually not yet — and "my accounts show a gain I never cashed" is usually correct too. Tax and accounting answer the realization question differently. This guide is where the line is, what trips it, and why the books and the return disagree on purpose.

TL;DR

• Tax (most individual regimes): generally on the realized gain — a disposal — not paper appreciation. A default, with mark-to-market and jurisdiction exceptions.
• Realized event ≈ sell for fiat, crypto-to-crypto (in many regimes), spend on goods/services. Self-transfer is not (see internal transfer vs disposal).
• Accounting can be the opposite: ASU 2023-08 puts unrealized fair-value changes through net income.
• The accounting fair-value move is not a taxable event by itself — tax follows realization unless mark-to-market applies.
• Holding through year-end generally does not realize a gain (individuals, realization regimes) — default, not absolute.
• The trigger list is jurisdiction-specific — confirm per country (see cost-basis methods).

The default: tax on disposal

In most individual regimes, a gain is taxed when realized — when a disposal or other defined taxable event occurs — not while the asset merely appreciates in the wallet. This is the standard realization principle. It is a default, not a universal law: mark-to-market rules or elections exist for certain taxpayers, and jurisdictions differ. State it as the model, then check the exceptions for your country.

What realizes a gain

The exact list is jurisdiction-specific. France, for occasional investors, treats crypto-to-fiat/goods/services as the taxable disposal while crypto-to-crypto is generally deferred (see the FR calculation). A self-transfer is never the trigger (see internal transfer vs disposal).

Why the books show what tax doesn't

Accounting and tax diverge by design. Under US GAAP, ASU 2023-08 measures in-scope crypto at fair value, changes through net income — including unrealized ones — every period (see ASU 2023-08 and impairment vs fair value). So the financial statements can show a gain you have not realized for tax. That accounting movement is not, by itself, a taxable event — tax still follows realization unless a mark-to-market rule applies. The reconciliation between book and taxable income is where this difference is managed.

The phantom-realization error

The most damaging mistake is treating a non-disposal as realized — most often a self-transfer booked as a sale (see internal transfer vs disposal), which manufactures a phantom taxable gain. Realization requires a disposal to a counterparty or another jurisdiction-defined event, not an internal movement or a chart re-pricing.

Practical guidance

1. Default to "tax on disposal" for individuals — then check mark-to-market/jurisdiction exceptions.
2. Know your jurisdiction's taxable-event list — it defines realization, not your intuition.
3. Never treat a self-transfer as realized — it is not a disposal.
4. Expect book ≠ tax — ASU 2023-08 unrealized movements are not taxable events by themselves.
5. Reconcile book to taxable income rather than assuming they match.
6. Confirm any mark-to-market position with an adviser — it overrides the default.

How vendor tools handle realized vs unrealized

Koinly and CoinTracker separate realized (disposal) gains from unrealized holdings and key realization to your jurisdiction's taxable events. Confirm the tool does not treat self-transfers as realized, distinguishes realized tax gains from an unrealized portfolio change, and reflects your country's specific trigger list rather than a generic default.

How Wag3s helps

Wag3s Folio computes realized gains only on jurisdiction-defined disposals, never on self-transfers, and reports the unrealized portfolio movement separately — so the taxable figure follows realization while the portfolio view shows paper performance. See the Folio product page.

Further reading

• Crypto Cost Basis Methods 2026
• Internal Transfer vs Disposal in Crypto
• FASB ASU 2023-08: Fair-Value Crypto Accounting
• Crypto Impairment vs Fair Value Accounting
• Crypto Portfolio PnL Calculation
• Crypto Capital Gains Calculation France (150 VH bis)

Sources

• General realization principle: individual tax generally on realized gains (disposal), not unrealized appreciation — jurisdiction-specific, with mark-to-market exceptions
• FASB ASU 2023-08 — in-scope crypto at fair value with changes (including unrealized) through net income (accounting ≠ tax)
• France — crypto-to-fiat/goods/services as the taxable disposal for occasional investors; crypto-to-crypto generally deferred (article 150 VH bis)
• Self-transfers between own wallets are not realization events