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To calculate your cash break-even price, divide your total purchase outlay by the amount of bitcoin you will sell after accounting for the sale fee. For a percentage fee deducted from sale proceeds: break-even sale price = (BTC quantity × purchase price per BTC + qualifying purchase costs) ÷ (BTC quantity × (1 − sale-fee rate)). Taxes are a separate calculation: for U.S. federal purposes, taxable gain or loss generally compares adjusted basis with the amount realized on the sale, not a generic tax percentage added to your break-even price.
Calculate your cash break-even price
Cash break-even is the quoted sale price at which the money you receive after selling equals what you spent to acquire the bitcoin. Use the actual amount you plan to sell, your purchase price, qualifying purchase costs, and the sale fee charged by your venue.
Let q be the BTC quantity, A the purchase quote per BTC, B qualifying purchase costs in dollars, and f the sale-fee rate as a decimal. If the sale fee is deducted from proceeds, calculate:
Break-even sale quote = (q × A + B) ÷ (q × (1 − f))
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If the sale also has a fixed charge S, include it in the numerator: (q × A + B + S) ÷ (q × (1 − f)). These formulas assume you sell the same quantity you bought, there are no other cash flows or charges, and the percentage fee is applied to sale proceeds.
Worked example
Suppose you buy 1 BTC at $50,000 and pay $100 in qualifying purchase costs. If the sale fee is 0.5% of proceeds, the calculation is $50,100 ÷ 0.995, or about $50,351.76 per BTC. This is hypothetical arithmetic, not a market quote, and assumes the stated fee is charged on the sale.
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Use the fee you will actually pay
There is no universal exchange fee rate to plug into the formula. Check the venue’s fee schedule and how its displayed price works. A spread can make the effective execution price differ from the quoted price; a fee paid in BTC changes the quantity you retain or sell and may not behave like a cash fee deducted from proceeds. Compare the effective execution price and spread, explicit purchase and sale charges, fees paid in cash or BTC, and withdrawal or transfer charges separately.
Separate cash break-even from taxable gain
For U.S. federal income tax purposes, the IRS treats digital assets as property, so general property transaction principles apply. The IRS says gain or loss on a sale for U.S. dollars or similar currency is the difference between adjusted basis and the amount realized. IRS FAQ 52 explains that amount-realized calculation.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFor a cash purchase, basis generally includes the cash paid and qualifying transaction costs to acquire the asset. On disposition, amount realized generally includes cash and the fair market value of services received, reduced by digital-asset transaction costs allocable to that disposition. The IRS lists transaction fees, gas fees, transfer taxes, and commissions as examples of such costs. A fee to move assets between your own wallets or accounts is not treated as a purchase, sale, or disposition cost under FAQ 53. See the IRS digital asset FAQs.
When fees are paid or withheld in BTC, paying for the service may itself be a disposition of the BTC used, with a separate gain or loss to consider. Do not automatically treat every fee as a deductible cash amount; identify what the fee paid for and how it was paid.
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If the sale proceeds after allocable disposition costs equal your adjusted basis, the disposition has no positive gain simply because tax rates exist. A target such as “make $500 after tax” is different from cash break-even and requires your actual tax circumstances. Do not add a generic tax rate to the formula above.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep records that support your basis and sale calculation
Save records for each purchase, receipt, sale, exchange, and other disposition. The IRS identifies useful details such as transaction date and time, units, U.S.-dollar fair market value, and basis. For applicable sales or other dispositions of digital assets held as capital assets, gains and deductible losses are reported on Form 8949 and summarized on Schedule D. See the IRS digital assets guidance.
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Broker tax reporting does not necessarily give you your basis. The IRS says brokers must report gross proceeds for covered transactions beginning January 1, 2025, and basis for certain transactions beginning January 1, 2026. In Tax Tip 2026-07, dated January 28, 2026, the IRS warned that most 2025 statements may not include basis. Keep your own records rather than assuming the broker statement supplies it. IRS Tax Tip 2026-07
Account for the holding period, but not with a guessed tax rate
For capital assets, the IRS classifies a holding period of one year or less as short-term and a holding period longer than one year as long-term. The applicable tax result depends on your full circumstances and rules that apply to you; the break-even equation does not determine it. The IRS’s Topic No. 409 describes capital gains and losses.
Scope of this calculation
This framework covers a basic cash purchase and sale and U.S. federal treatment. It does not calculate an individual tax bill or establish state, local, or non-U.S. rules. It also does not account for every possible cash flow, such as partial sales or other transactions; calculate each relevant amount from the actual transaction records and fee treatment.
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