Crypto taxes can feel overwhelming, especially with the IRS increasing enforcement and expanding reporting rules in 2025. A single year of trading can include hundreds—or even thousands—of transactions. And small mistakes can lead to penalties, IRS letters, audits, or overpaying by thousands of dollars.
This guide breaks down the top crypto tax mistakes investors make and provides step-by-step instructions to avoid them. Whether you're a beginner or an experienced trader, these tips will help you stay compliant and stress-free.
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Not Reporting All Crypto Transactions
Failing to report all taxable crypto events is the #1 mistake investors make. Many people think only selling crypto for cash is taxable—but the IRS requires reporting every taxable event, including:
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Trading crypto for crypto
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Selling for fiat
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Receiving staking rewards
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Airdrops
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NFT sales
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Yield farming rewards
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Liquidity pool gains
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Cross-chain swaps
If the transaction changes your cost basis or gives you income, it must be reported.
How to Avoid It (Step-by-Step)
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Connect all wallets and exchanges to a crypto tax tool (Koinly, CoinLedger, ZenLedger).
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Upload CSV files for exchanges without API access.
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Fix any missing cost basis or “unknown transaction” warnings.
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Review your full year, including DeFi and NFTs.
Mixing Up Crypto Income vs. Capital Gains
Crypto income and capital gains are taxed differently. Mixing them up can lead to overpaying or IRS penalties.
Income includes:
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Staking rewards
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Airdrops
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Referral rewards
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Mining income
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NFT royalties
Capital gains include:
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Buying and selling
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Trading crypto pairs
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NFT sales
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Wrapped token conversions
How to Avoid It (Step-by-Step)
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Label income transactions correctly in your tax tool.
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Verify staking rewards are marked as income, not gains.
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Categorize NFT royalties as income before generating forms.
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Double-check 1099s and tax forms match your categories.
Forgetting About DeFi and Cross-Chain Transactions
DeFi activity is one of the most overlooked areas in crypto tax reporting because it happens on-chain, not on centralized exchanges.
Examples of commonly missed DeFi events:
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Liquidity pool deposits/withdrawals
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Yield farming
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Borrowing & lending
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Claiming rewards
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Bridging assets
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Auto-compounding vaults
Every one of these can be taxable.
How to Avoid It (Step-by-Step)
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Sync your on-chain wallet (MetaMask, Ledger, Coinbase Wallet).
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Turn on advanced DeFi tracking in your tax tool.
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Fix “unknown smart contract” warnings.
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Confirm each LP or DeFi action is categorized correctly.
Not Tracking Your Cost Basis Correctly
If you don’t track cost basis correctly, the IRS may treat your entire sale as profit—leading to huge unnecessary tax bills.
Issues that cause problems:
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Wallet transfers showing as taxable sales
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Lost trade history
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Missing CSVs
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Using different accounting methods each year
How to Avoid It (Step-by-Step)
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Import every trade into a tax tool automatically.
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Use IRS-approved accounting methods consistently:
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FIFO
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LIFO
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HIFO
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Match internal transfers so they don’t appear as gains.
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Backup reports each tax year so your cost basis stays accurate.
Missing Opportunities for Tax-Loss Harvesting
Tax-loss harvesting can save you thousands, yet most investors don’t use it.
Crypto has no wash sale rule as of 2025—meaning you can sell and buy back immediately to claim the loss.
How to Avoid It (Step-by-Step)
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Review your tax dashboard for unrealized losses.
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Identify coins below your cost basis.
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Sell the losing positions to lock in the loss.
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Immediately rebuy if you want to keep the asset.
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Regenerate your tax report with updated data.
Ignoring Small Transactions That Add Up
Small, frequent transactions—like micro-rewards, NFT mints, dust trades, and gas fees—can create big issues if ignored.
Missed micro-transactions can cause:
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Incorrect cost basis
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IRS mismatches
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Red flags during audits
How to Avoid It (Step-by-Step)
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Import all micro-transactions from every chain.
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Use auto-categorization rules in your tax software.
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Run a reconciliation check to ensure nothing is missing.
Filing Late or Not Keeping Records
Crypto is a high-audit-risk category. Filing late or losing reports increases IRS scrutiny.
You must keep detailed records such as:
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Exchange reports
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Wallet data
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NFT transactions
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DeFi activity logs
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CSV exports
How to Avoid It (Step-by-Step)
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Start preparing taxes early (January–February).
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Backup reports to both cloud and offline storage.
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Use a CPA if you trade high volume, DeFi, or NFTs.
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Save records for at least 7 years.
Not Using Crypto Tax Software (or Using It Incorrectly)
Manual crypto tax reporting is nearly impossible today. Without the right software, you risk:
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Incorrect gain/loss calculations
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Missing cost basis
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Double-counted trades
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Incorrect income classification
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Overpaying on taxes
How to Avoid It (Step-by-Step)
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Choose a reliable crypto tax tool:
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Koinly (best overall)
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CoinLedger (best for NFTs + DeFi)
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ZenLedger (best for audit protection)
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TokenTax (CPA-ready filing)
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Connect all wallets and exchange accounts.
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Review warnings and error messages.
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Generate IRS-ready forms and file accurately.
Final Thoughts: Crypto Taxes Don’t Have to Be Complicated
Crypto taxes only feel overwhelming because investors often repeat the same avoidable mistakes. Once you understand the rules and use the right tools, filing becomes straightforward—and you can save a significant amount of money.
Quick Summary of Mistakes to Avoid
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Not reporting all transactions
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Mislabeling income vs. capital gains
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Ignoring DeFi and cross-chain activity
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Losing track of cost basis
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Missing tax-loss harvesting
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Overlooking micro-transactions
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Filing late without documentation
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Not using tax software properly
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About the Author: Alex Assoune
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