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smithery/jeremylongshore

calculating-crypto-taxes

Calculate cryptocurrency tax obligations with cost basis tracking, capital gains computation, and Form 8949 generation. Use when calculating crypto taxes, generating tax reports, comparing cost basis methods, or identifying taxable events. Trigger with phrases like "calculate crypto taxes", "generate tax report", "cost basis FIFO", "capital gains", "Form 8949", or "crypto taxable events". '

Installation

$ npx skills add smithery/jeremylongshore --skill calculating-crypto-taxes
View on skills.sh ↗ Website ↗

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More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Skill metadata

Parsed from SKILL.md frontmatter.

Version1.27.0
LicenseMIT
CompatibilityDesigned for Claude Code
Allowed toolsRead, Write, Bash(crypto:tax-*)
Declared agents claude-code

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 4,640 B
  • docs SUMMARY.md 425 B

History

  1. First recorded snapshot · 0 installs

SKILL.md

Calculating Crypto Taxes

Overview

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.

Prerequisites

  • Transaction history exported as CSV from your exchanges (Coinbase, Binance, Kraken, etc.)
  • Python 3.8+ installed
  • Understanding of your tax jurisdiction's crypto rules

Instructions

  1. 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 ${CLAUDESKILLDIR}/references/exchange_formats.md for column mapping
  1. Run basic tax calculation using FIFO (IRS default):

``bash python ${CLAUDESKILLDIR}/scripts/taxcalculator.py --transactions yourtrades.csv --year 2025 # 2025 = tax year ``

  1. Compare cost basis methods to understand tax implications:

``bash python ${CLAUDESKILLDIR}/scripts/tax_calculator.py --transactions trades.csv --compare-methods ``

Methods: --method fifo (IRS default), --method lifo (Last In First Out), --method hifo (minimize gains)

  1. Generate Form 8949 report as CSV:

``bash python ${CLAUDESKILLDIR}/scripts/taxcalculator.py --transactions trades.csv --method fifo --year 2025 --output form8949.csv --format csv # 2025 = tax year ``

  1. Handle income events (staking, airdrops, mining, DeFi yield):

``bash python ${CLAUDESKILLDIR}/scripts/taxcalculator.py --transactions allevents.csv --income-report ``

  1. Consolidate multi-exchange data into a unified report:

``bash python ${CLAUDESKILLDIR}/scripts/tax_calculator.py --transactions coinbase.csv binance.csv kraken.csv --year 2025 # 2025 = tax year ``

Output

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 ${CLAUDESKILLDIR}/references/implementation.md for detailed output format examples.

Error Handling

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

Examples

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

Resources