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Calculates crypto capital gains taxes from exchange CSVs using FIFO/LIFO/HIFO; identifies taxable events; generates Form 8949 reports via Python scripts.
How this skill is triggered — by the user, by Claude, or both
Slash command
/crypto-tax-calculator:calculating-crypto-taxesThis skill is limited to the following tools:
The summary Claude sees in its skill listing — used to decide when to auto-load this skill
Calculate cryptocurrency tax obligations from transaction history. Supports FIFO, LIFO, and HIFO cost basis methods, identifies taxable events (trades, staking, airdrops), and generates Form 8949 compatible reports.
Calculate cryptocurrency tax obligations from transaction history. Supports FIFO, LIFO, and HIFO cost basis methods, identifies taxable events (trades, staking, airdrops), and generates Form 8949 compatible reports.
DISCLAIMER: This tool provides informational calculations only, not tax advice. Consult a qualified tax professional.
Prepare transaction data by exporting CSV from each exchange:
| Exchange | Export Location |
|---|---|
| Coinbase | Reports > Tax documents > Transaction history CSV |
| Binance | Orders > Trade History > Export |
| Kraken | History > Export |
| Generic | See ${CLAUDE_SKILL_DIR}/references/exchange_formats.md for column mapping |
Run basic tax calculation using FIFO (IRS default):
python ${CLAUDE_SKILL_DIR}/scripts/tax_calculator.py --transactions your_trades.csv --year 2025 # 2025 = tax year
Compare cost basis methods to understand tax implications:
python ${CLAUDE_SKILL_DIR}/scripts/tax_calculator.py --transactions trades.csv --compare-methods
Methods: --method fifo (IRS default), --method lifo (Last In First Out), --method hifo (minimize gains)
Generate Form 8949 report as CSV:
python ${CLAUDE_SKILL_DIR}/scripts/tax_calculator.py --transactions trades.csv --method fifo --year 2025 --output form_8949.csv --format csv # 2025 = tax year
Handle income events (staking, airdrops, mining, DeFi yield):
python ${CLAUDE_SKILL_DIR}/scripts/tax_calculator.py --transactions all_events.csv --income-report
Consolidate multi-exchange data into a unified report:
python ${CLAUDE_SKILL_DIR}/scripts/tax_calculator.py --transactions coinbase.csv binance.csv kraken.csv --year 2025 # 2025 = tax year
Reports include short-term and long-term capital gains/losses broken down by transaction, with proceeds, cost basis, and gain/loss per disposal. Summary shows total proceeds, total cost basis, net capital gain, and short/long-term split. Income report lists staking, airdrop, and mining income with fair market values.
See ${CLAUDE_SKILL_DIR}/references/implementation.md for detailed output format examples.
| Error | Cause | Fix |
|---|---|---|
| Missing columns | CSV format mismatch | Verify format matches exchange template |
| Unknown transaction type | Unrecognized event category | Review and manually categorize |
| Insufficient lots | Missing buy transactions | Check for missing imports or transfers |
Basic FIFO tax calculation - Standard IRS-default method for a single exchange:
python tax_calculator.py --transactions trades.csv --year 2025 # 2025 = tax year
HIFO to minimize gains - Highest-cost lots disposed first to reduce taxable gain:
python tax_calculator.py --transactions trades.csv --method hifo --year 2025 # 2025 = tax year
JSON output for processing - Machine-readable export for tax software integration:
python tax_calculator.py --transactions trades.csv --format json --output tax_data.json
Verbose with lot details - See which specific lots were matched to each disposal:
python tax_calculator.py --transactions trades.csv --verbose --show-lots
${CLAUDE_SKILL_DIR}/references/implementation.md - Detailed output formats, configuration, advanced usagenpx claudepluginhub jeremylongshore/claude-code-plugins-plus-skills --plugin crypto-tax-calculatorDigital asset and cryptocurrency tax rules. Invoked by core skills when a 1099-DA is detected during document import or when the user reports cryptocurrency transactions.
Exports Kraken trades, ledgers, futures history, deposits, withdrawals, and staking rewards to CSV/JSON for tax reporting, auditing, and cost basis calculation.
Audits investment portfolios for tax inefficiencies including asset location, tax-loss harvesting, and withdrawal sequencing.