Crypto Capital Gains Calculator

What it does

The IRS classifies cryptocurrency as property, not currency, which means every taxable disposition — sale for fiat, swap for another coin, payment for goods, even gas fees on Ethereum sometimes — triggers a capital-gain or capital-loss event. The gain equals proceeds minus cost basis (what you paid plus fees). Holding period determines whether the gain is short-term (held one year or less, taxed at ordinary income rates of 10 to 37 percent depending on bracket) or long-term (held more than one year, taxed at 0, 15, or 20 percent depending on income). That one-year boundary can mean the difference between paying 22 percent and paying 0 percent — for many investors it’s the single highest-leverage tax decision in their portfolio.

This calculator takes your buy price, sell price, holding period, filing status, and taxable-income tier, then estimates the federal capital-gains tax owed on the transaction. Long-term thresholds for tax year 2024: single filers pay 0 percent on long-term gains up to $47,025 of total taxable income, 15 percent from $47,026 to $518,900, and 20 percent above. Married filing jointly: 0 percent up to $94,050, 15 percent to $583,750, 20 percent above. Short-term gains stack on top of ordinary income and follow the same brackets as wages. Add 3.8 percent NIIT (Net Investment Income Tax) for high-income filers above $200K single / $250K MFJ.

Caveats and complications this tool does NOT handle: state taxes (New York, California, New Jersey can add 5 to 13 percent on top — California treats long-term and short-term identically as ordinary income), wash-sale rules (currently NOT applied to crypto by IRS, unlike securities — meaning you CAN tax-loss-harvest by selling at a loss and rebuying immediately, though Congress has proposed closing this loophole repeatedly), like-kind exchanges (no — Section 1031 was restricted to real estate in 2017, so swapping BTC for ETH is a taxable event), and DeFi staking/lending income (taxed as ordinary income at receipt). For anything beyond simple buy-sell, talk to a crypto-savvy CPA and use a transaction-import tool like Koinly, CoinTracker, or TaxBit.

How to use it

1. Enter your purchase (basis) price and total — what you paid in USD including fees.
2. Enter your sell price and total proceeds in USD.
3. Enter the holding period (days or months) — the tool flags whether you crossed the 1-year long-term threshold.
4. Pick your filing status (single, MFJ, HoH) and approximate taxable-income tier.
5. Read the estimated federal tax, after-tax net proceeds, and effective tax rate. Add state tax separately.

When to use this tool

• Planning whether to sell now (short-term) or hold a few more weeks/months to cross the 1-year mark for long-term rates.
• Estimating tax owed before filing season so you can set aside cash and avoid an underpayment penalty.
• Comparing the after-tax outcome of selling at multiple price points or in multiple lots.
• Tax-loss harvesting decisions — quantifying the dollar value of realizing a loss to offset other gains.

When not to use it

• DeFi/staking income, NFT sales (collectibles tax = up to 28%), or hard-forks — those have separate rules.
• Multi-lot or FIFO/LIFO/specific-ID basis decisions across many transactions — use Koinly/CoinTracker/TaxBit.
• Non-US filers — capital-gains rules vary dramatically by country (UK, Germany, Portugal, Singapore all very different).
• As a substitute for a CPA when you have $50K+ in crypto activity — the regulations are evolving and audit risk rises with volume.

Common use cases

• Educational use — demonstrating the underlying concept
• Onboarding a colleague who needs the same calculation/conversion
• Verifying a number or output before passing it on
• Quick calculation during a typical workday