Crypto Tax Calculator & Exporter

A self-hosted crypto tax calculation tool that imports your complete trading history from exchanges and on-chain transactions, calculates capital gains using your preferred accounting method, and exports tax-ready reports.

What's Included — Full Source Code:

• Complete TypeScript source code
• Exchange import connectors (15+ CEXs)
• On-chain transaction decoder
• Tax calculation engine
• Export templates for major tax software
• Docker deployment

Core Features:

• Universal import — CSV upload, API sync, or on-chain indexing for Ethereum, Solana, Bitcoin, and 10+ chains
• Transaction classification — auto-categorises trades, swaps, staking rewards, airdrops, NFT sales, DeFi yields, and bridge transfers
• Cost basis methods — FIFO, LIFO, HIFO, and specific identification
• Multi-currency — supports USD, EUR, GBP, AUD, CAD, and 20+ fiat currencies with historical price data
• DeFi support — handles LP deposits/withdrawals, yield farming, impermanent loss, and governance token rewards
• NFT support — tracks mint cost, sale price, royalties, and wash sale detection

Tax Reports:

• Capital gains summary (short-term vs. long-term)
• Transaction-level detail with cost basis and gain/loss per trade
• Income report (staking, airdrops, mining)
• TurboTax TXF export
• Koinly, CoinTracker, CoinLedger compatible CSV
• IRS Form 8949 format

Dashboard:

• Portfolio overview with unrealised gains
• Tax-loss harvesting suggestions
• Year-by-year comparison
• Audit trail with source transaction links

Tech Stack:

• TypeScript + Next.js
• ccxt for exchange data
• ethers.js + @solana/web3.js for on-chain
• PostgreSQL for transaction storage
• Docker Compose

Self-hosted. Your data never leaves your machine. Save thousands vs. SaaS tax tools.