United States crypto tax calculator methodology

This page explains the scope, formula, and deliberate simplifications behind CoinLineup's v1 United States crypto tax calculator. It is designed to help readers evaluate the estimate, not to replace filing software or professional advice.

What the v1 calculator does

The calculator estimates a single disposal outcome using the quantity sold, buy price, sell price, fees, user-entered rate assumptions, and a narrow set of country-specific rules.

Core formula

  • Cost basis = quantity × buy price + buy-side fees
  • Proceeds = quantity × sell price - sell-side fees
  • Raw gain or loss = proceeds - cost basis
  • Optional manual adjustment = reader-entered allowance or exclusion
  • Estimated tax = taxable amount × applicable estimated rate

Country-specific rule used in this version

The IRS treats digital assets as property. Investment gains or losses are generally capital in nature when you dispose of crypto held as a capital asset.

A disposal held for one year or less is treated as short-term. A disposal held for more than one year is treated as long-term.

This v1 tool uses the reader's single-lot cost basis from the entered buy price and fees. It does not attempt lot selection or broker-specific identification rules.

Important simplifications

  • Built for a single disposal rather than a full tax-year ledger.
  • The preset flow is a simplified estimator built from IRS federal bracket pages and long-term capital gains guidance, not a full return calculation.
  • Does not model wash sales, staking income, mining income, airdrops, or DeFi-specific treatment.
  • Does not model specific lot identification or broker reporting differences.

Why the calculator asks for your own rate assumptions

Tax outcomes can vary based on income level, filing status, province or state, prior gains and losses, available reliefs, and whether a transaction is treated as capital or income. For that reason, the tool uses reader-entered rates rather than hardcoding personal tax brackets.

How the U.S. preset flow works

The U.S. calculator also includes a beginner preset mode. In that mode, CoinLineup maps the selected filing status and taxable income band to a simplified federal short-term estimate and a simplified federal long-term capital gains estimate.

  • Short-term estimates follow the selected IRS ordinary-income bracket band for the chosen filing status.
  • Long-term estimates follow IRS capital gains guidance for 0%, 15%, and 20% federal long-term rate bands.
  • The state layer in this v1 tool is only an extra rough overlay. It is not a full state-return engine.

This is still a simplified model. It does not calculate full taxable income, netting rules, surtaxes, NIIT, deductions, or every state-specific exception before choosing a bracket.

When the estimate is likely too simple

  • Multi-lot disposals where basis tracking changes across time
  • DeFi transactions, staking receipts, airdrops, forks, or business-income treatment
  • Cases with matching rules, pooled basis rules, wash-sale style issues, or jurisdiction-specific elections
  • Cross-border residence changes or transactions denominated across several currencies

Source policy for this page

CoinLineup links to official tax-agency guidance where possible. Readers should confirm that the official page, rate, allowance, or manual still applies to their facts and to the relevant tax year.