Crypto Tax Export Skill for Claude

Crypto Tax Export

Export trade history and tax calculations for tax software and IRS filing. Handles Solana-specific transaction types (Jupiter swaps, LP operations, staking rewards, airdrops) and generates CSVs compatible with Koinly, CoinTracker, CoinLedger, TokenTax, TurboTax/TaxAct, and IRS Form 8949.

> Disclaimer: This skill provides data formatting and calculation tools only. It does not constitute tax advice. Consult a qualified tax professional for guidance on reporting cryptocurrency transactions. Tax laws vary by jurisdiction and change frequently.

Prerequisites

• Python 3.10+
• Trade history data (from internal trade journal, on-chain history, or exchange exports)
• For on-chain reconciliation: Solana RPC or Helius API access (see helius-api skill)
• For cost basis: historical price data (see birdeye-api or coingecko-api skills)

Capabilities

| Capability | Description |

|---|---|

| Multi-format CSV export | Koinly, CoinTracker, CoinLedger, TokenTax, TurboTax, TaxAct |

| IRS Form 8949 generation | Part I (short-term) and Part II (long-term), columns a through h |

| Solana tx classification | Jupiter swaps, multi-hop routes, LP deposits/withdrawals, staking, airdrops |

| Cost basis methods | FIFO, LIFO, HIFO, Specific Identification |

| Reconciliation | Match on-chain history against internal trade journal |

| Failed tx handling | Identify and exclude failed transactions (no taxable event) |

Supported Export Formats

Koinly CSV

Koinly expects a universal import format with these columns:

Date,Sent Amount,Sent Currency,Received Amount,Received Currency,Fee Amount,Fee Currency,Net Worth Amount,Net Worth Currency,Label,Description,TxHash

Labels: swap, staking, airdrop, liquidity_in, liquidity_out, cost, gift, lost.

CoinTracker CSV

Date,Received Quantity,Received Currency,Sent Quantity,Sent Currency,Fee Amount,Fee Currency,Tag

Tags: trade, staking_reward, airdrop, lp_deposit, lp_withdrawal.

CoinLedger CSV

Date (UTC),Type,Received Currency,Received Amount,Sent Currency,Sent Amount,Fee Currency,Fee Amount,Exchange/Wallet

Types: Trade, Income, Gift Received, Mining, Staking Reward, Airdrop.

TokenTax CSV

Type,BuyAmount,BuyCurrency,SellAmount,SellCurrency,FeeAmount,FeeCurrency,Exchange,Group,Comment,Date

Types: Trade, Income, Staking, Airdrop, Spending.

TurboTax / TaxAct CSV

Both accept a simplified Form 8949 format:

Description of Property,Date Acquired,Date Sold,Proceeds,Cost Basis,Gain or Loss

IRS Form 8949

Part I — Short-term (held one year or less). Part II — Long-term (held more than one year).

Columns:

• (a) Description of property (e.g., "2.5 SOL")
• (b) Date acquired (MM/DD/YYYY)
• (c) Date sold or disposed of (MM/DD/YYYY)
• (d) Proceeds (sale price in USD)
• (e) Cost or other basis (purchase price in USD + fees)
• (f) Code, if any (per IRS instructions)
• (g) Adjustment amount
• (h) Gain or loss (d minus e, adjusted by g)

Check box: (A) if basis reported to IRS, (B) if not, (C) if Form 1099-B not received.

Solana Transaction Classification

Jupiter Swaps (Single-Hop)

A direct token-to-token swap. Classified as a disposal of the sent token and acquisition of the received token. Each side is a taxable event.

tx = {
    "type": "swap",
    "sent": {"amount": 1.5, "currency": "SOL", "usd_value": 225.00},
    "received": {"amount": 50000, "currency": "BONK", "usd_value": 224.50},
    "fee": {"amount": 0.000005, "currency": "SOL", "usd_value": 0.00075},
    "timestamp": "2025-03-15T14:30:00Z",
    "tx_hash": "5abc...def",
}

Jupiter Swaps (Multi-Hop)

A routed swap through intermediate tokens (e.g., SOL -> USDC -> BONK). Only the initial send and final receive matter for tax purposes. Intermediate hops are not separate taxable events.

LP Deposits / Withdrawals

• Deposit: Sending tokens to an LP is generally treated as a disposal at fair market value.
• Withdrawal: Receiving tokens from an LP is an acquisition at fair market value.
• LP tokens received/burned may be tracked for cost basis continuity.

Staking Rewards

Staking rewards (SOL validator rewards, liquid staking yield) are income at fair market value when received. Cost basis equals the FMV at receipt.

Airdrops

Airdrops are income at fair market value when the recipient gains dominion and control. Some jurisdictions differ on when dominion is established.

Token Migrations

A 1:1 token migration (e.g., protocol upgrade) is generally not a taxable event. The new token inherits the cost basis and holding period of the old token.

Failed Transactions

Failed Solana transactions (status: failed, or inner instruction errors) are not taxable events. The transaction fee (SOL) may still be deductible as a cost of doing business in some jurisdictions. Always exclude failed txs from trade export.

Cost Basis Methods

from enum import Enum

class CostBasisMethod(Enum):
    FIFO = "fifo"      # First In, First Out (IRS default)
    LIFO = "lifo"      # Last In, First Out
    HIFO = "hifo"      # Highest In, First Out (minimizes gains)
    SPEC_ID = "spec_id" # Specific Identification (requires lot tracking)

def compute_gain(
    proceeds: float,
    cost_basis: float,
    adjustments: float = 0.0,
) -> float:
    """Compute gain or loss for Form 8949 column (h)."""
    return proceeds - cost_basis + adjustments

Reconciliation

Reconciling on-chain history with an internal trade journal catches:

• Missing trades — on-chain tx not in journal (manual entry missed)
• Phantom trades — journal entry with no matching on-chain tx
• Amount mismatches — journal amount differs from on-chain amount
• Duplicate entries — same tx recorded twice

Reconciliation workflow:

def reconcile(
    journal_trades: list[dict],
    onchain_txs: list[dict],
    tolerance: float = 0.001,
) -> dict:
    """Match journal entries to on-chain transactions.

    Args:
        journal_trades: Internal trade records with tx_hash field.
        onchain_txs: Parsed on-chain transactions.
        tolerance: Relative tolerance for amount matching.

    Returns:
        Dict with matched, missing_onchain, missing_journal,
        mismatched lists.
    """
    onchain_by_hash = {tx["tx_hash"]: tx for tx in onchain_txs}
    matched, missing_onchain, missing_journal, mismatched = [], [], [], []

    for trade in journal_trades:
        tx = onchain_by_hash.pop(trade.get("tx_hash", ""), None)
        if tx is None:
            missing_onchain.append(trade)
        elif abs(trade["amount"] - tx["amount"]) / max(tx["amount"], 1e-9) > tolerance:
            mismatched.append({"journal": trade, "onchain": tx})
        else:
            matched.append({"journal": trade, "onchain": tx})

    missing_journal = list(onchain_by_hash.values())

    return {
        "matched": matched,
        "missing_onchain": missing_onchain,
        "missing_journal": missing_journal,
        "mismatched": mismatched,
        "summary": {
            "total_journal": len(journal_trades),
            "total_onchain": len(onchain_txs),
            "matched": len(matched),
            "missing_onchain": len(missing_onchain),
            "missing_journal": len(missing_journal),
            "mismatched": len(mismatched),
        },
    }

Quick Start

from scripts.tax_exporter import (
    generate_demo_trades,
    export_koinly_csv,
    export_form_8949_csv,
)

# Generate sample trades
trades = generate_demo_trades()

# Export to Koinly format
export_koinly_csv(trades, "koinly_import.csv")

# Export to Form 8949 format
export_form_8949_csv(trades, "form_8949.csv")

Run the demo directly:

python scripts/tax_exporter.py --demo

Use Cases

End-of-Year Tax Filing

Export all trades from your journal, reconcile with on-chain history, generate Form 8949 line items, and import into TurboTax or hand to your CPA.

Tax-Loss Harvesting Review

Export with HIFO cost basis method to identify positions with unrealized losses that could offset gains before year-end.

Multi-Platform Consolidation

Combine trades from multiple wallets and DEXs into a single Koinly or CoinTracker import file for unified portfolio tax reporting.

Audit Preparation

Use reconciliation to verify completeness of your trade records against on-chain history. Produce a clean Form 8949 with supporting transaction hashes.

Files

| File | Description |

|---|---|

| references/planned_features.md | Export format specs, Form 8949 mapping, Solana tx classification, reconciliation methodology |

| scripts/tax_exporter.py | Demo script: generate trades, export to Koinly CSV and Form 8949 CSV, show format differences |

Related Skills

• helius-api — Fetch and parse Solana transaction history for reconciliation
• birdeye-api / coingecko-api — Historical price data for cost basis lookups
• solana-onchain — Wallet transaction analysis and classification
• trade-journal — Internal trade record keeping