Top 10 crypto declaration mistakes in Spain

1. FIFO per exchange (not global) — AEAT requires global FIFO across all exchanges
2. Staking as capital gain — Staking = capital income (different tax form)
3. Ignoring crypto-to-crypto swaps — BTC→ETH is a taxable event
4. Forgetting secondary exchanges — ALL exchanges must be declared
5. Not declaring losses — Losses offset gains, reducing your tax
6. Marking own-wallet transfers as sales — Transfers between your wallets = not taxable
7. Ignoring airdrops — Airdrops = capital income at market value when received
8. Forgetting Models 172 and 173 — Mandatory for foreign exchanges (January deadline)
9. Wrong acquisition cost for crypto-to-crypto buys — Acquisition cost = market value of crypto paid
10. No record-keeping — Keep exchange CSVs for 5+ years

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