finance calculator
Estimate tax on a sale using holding period and short vs long-term rates.
Any time you sell investments like stocks, ETFs, mutual funds, or crypto for more than you paid, you may owe capital gains tax. The tricky part is that not all gains are taxed the same way: short‑term gains (on assets held one year or less) are usually taxed at your ordinary income rate, while long‑term gains (on assets held more than a year) often get a lower, preferential rate.
This capital gains tax calculator walks you through that logic. By entering what you paid (cost basis), what you sold for (sale proceeds), how long you held the asset, and your estimated short‑term and long‑term tax rates, you can quickly see your gain or loss, an estimated tax bill, and the effective tax rate on the transaction. It’s a planning tool—not a filing engine—but it gives you a clear sense of the tax impact before you click “sell.”
Capital gain (or loss) is the difference between your sale proceeds and your cost basis. Cost basis typically includes the purchase price plus certain transaction costs such as commissions or fees; sale proceeds are what you receive from the sale before taxes but after normal selling commissions.
If the result of sale proceeds − cost basis is positive, you have a gain. If it is negative, you have a capital loss. This calculator reports both possibilities so you can see whether you are realizing a gain or harvesting a loss.
The holding period determines whether the gain is treated as short‑term or long‑term. In a simplified model like this one, we treat 12 or more months as long‑term and anything less than 12 months as short‑term.
You provide your estimated long‑term capital gains rate (often 0%, 15%, or 20% at the federal level in the U.S.) and your short‑term rate (generally your marginal ordinary income rate, such as 22%, 24%, or 32%).
When the gain is positive, the calculator checks your holding period. If holdingMonths is 12 or more, it applies the long‑term rate you entered. If it is less than 12, it applies the short‑term rate. For losses or zero gains, estimated tax is shown as zero in this simplified model.
The effective rate is computed as Estimated tax ÷ Positive gain, expressed as a percentage, so you can see how much of the gain you are giving up in taxes under your assumptions.
Because real‑world tax systems include brackets, surcharges, and special rules (like the Net Investment Income Tax or state taxes), this tool focuses on a single blended rate that you supply rather than computing the entire tax return.
Let B = Cost basis, P = Sale proceeds.\nGain = P − B.\nIf Gain ≤ 0: Tax = 0 (loss not monetized here).\nIf Gain > 0 and HoldingMonths ≥ 12: Tax = Gain × (Long‑term rate ÷ 100).\nIf Gain > 0 and HoldingMonths < 12: Tax = Gain × (Short‑term rate ÷ 100).\nEffective rate (if Gain > 0) = Tax ÷ Gain.
Estimate capital gains tax on an investment sale by entering cost basis, sale proceeds, holding period, and your long‑term and short‑term tax rates. See your gain or loss, an estimated tax bill, and the effective tax rate on the trade.
Use this capital gains tax calculator to compare selling now versus waiting for long‑term treatment, understand the impact of rebalancing or cash‑raising trades, and avoid unpleasant surprises at tax time.
Ideal for taxable brokerage accounts, this tool highlights the difference between short‑term and long‑term capital gains and helps investors translate price moves into after‑tax outcomes.
This capital gains tax calculator provides simplified estimates based on user‑entered cost basis, sale proceeds, holding period, and tax rates. It does not compute full tax returns, apply all relevant rules, or account for every type of asset or jurisdiction. Treat the results as rough planning numbers only and consult official guidance or a qualified tax professional before making significant investment or tax decisions.
