Home Sale Net Proceeds & Section 121 Capital Gains Tax Calculator
Calculate net cash proceeds at closing and potential IRS capital gains tax when selling a residential property, incorporating IRS Section 121 primary residence tax exclusions ($250k single / $500k married), adjusted cost basis, agent commissions, and state capital gains taxes.
Enter Your Details
Enter your details and click Calculate
Fill in your details on the left to see your full tax breakdown and analysis.
Calculation Methodology
Sourced from official Internal Revenue Service (IRS) regulations
Net Selling Proceeds = Sale Price minus closing costs and agent commissions (default ~8%).
Cost Basis = Original Purchase Price plus qualified capital improvements.
Realized Capital Gain = Net Selling Proceeds minus Cost Basis.
Under IRS Section 121, if you owned and lived in the home as a primary residence for at least 2 of the 5 years before sale, up to $250,000 (Single) or $500,000 (Married Joint) of capital gain is completely tax-free.
Taxable Gain above the exclusion is taxed at long-term capital gains rates (0%, 15%, or 20%) plus Net Investment Income Tax (3.8%) if income thresholds are met.
Recommended Tools
Trusted solutions for United States professionals
Clever Real Estate
Discount listing agent service allowing home sellers to save up to 1.5% in real estate commissions.
Rocket Mortgage
Mortgage payoff, bridge loans, and pre-approval for replacement primary residence purchase.
First American Title Insurance
Closing escrow services and seller title transfer insurance.
Frequently Asked Questions
Common questions about this calculation
Q.What is the Section 121 primary residence exclusion?
IRC Section 121 allows single homeowners to exclude up to $250,000 and married couples filing jointly up to $500,000 of capital gains from federal income tax when selling a primary residence.
Q.What qualifies as capital improvements to increase cost basis?
Capital improvements are permanent structural additions or major upgrades that add value or prolong the home's useful life (e.g. adding a room, new roof, HVAC system, kitchen remodel). General maintenance and repairs do not qualify.
Q.What are the requirements for the 2-in-5-year rule?
You must have owned the property and lived in it as your primary main home for at least 24 months (730 days) during the 5-year period ending on the date of the sale.
Q.What long-term capital gains tax rates apply in 2026?
Long-term capital gains on home sales above the Section 121 exclusion are taxed at 0%, 15%, or 20% depending on overall taxable income, plus an optional 3.8% Net Investment Income Tax (NIIT) for high earners.
Disclaimer: Results are estimates based on standard tax rules for the 2026 tax year and are provided for informational purposes only. Individual circumstances (deductions, credits, specific state/local rules) may significantly affect your actual tax liability. Always consult a qualified tax professional or accountant for advice specific to your situation.