Crypto Tax Reporting System Development

Development of Crypto Tax Reporting System

Tax reporting — final step in crypto accounting cycle. System transforms calculated tax events into formats accepted by tax authorities or ready for accountant transfer.

Report Formats by Jurisdiction

USA: IRS Form 8949 + Schedule D UK: HMRC Capital Gains Summary Germany: Anlage SO Universal: CSV for accountant

CSV Export

async function generateKoinlyCSV(transactions: UnifiedTransaction[]): Promise<string> {
  const headers = ["Date", "Sent Amount", "Sent Currency", "Received Amount", "Received Currency", 
                   "Fee Amount", "Fee Currency", "Net Worth Amount", "Net Worth Currency", 
                   "Label", "Description", "TxHash"];
  
  const rows = transactions.map(tx => [
    format(tx.timestamp, "yyyy-MM-dd HH:mm:ss"),
    tx.amountOut ?? "",
    tx.assetOut ?? "",
    tx.amountIn ?? "",
    tx.assetIn ?? "",
    tx.feeAmount ?? "",
    tx.feeCurrency ?? "",
    tx.valueUSD ?? "",
    "USD",
    mapToKoinlyLabel(tx.category),
    tx.notes ?? "",
    tx.txHash ?? "",
  ]);
  
  return [headers.join(","), ...rows.map(r => r.join(","))].join("\n");
}

Developing tax reporting system with support for IRS 8949, HMRC CGT, Anlage SO and Koinly-compatible CSV — 3-4 weeks.