How Does the Federal Home-Sale Exclusion Work?

The IRS says a qualifying individual may exclude up to $250,000 of gain from a main-home sale. Many married couples filing jointly may exclude up to $500,000 if either spouse meets the ownership test, both spouses meet the use test, and neither spouse used the exclusion for another home during the prior two years.

The core test looks at the five-year period ending on the sale date: generally, you must have owned the home for at least two years and used it as your main home for at least two years. The periods need not always be continuous, and special rules or reduced exclusions may apply in limited situations.

Use the current IRS Publication 523, Selling Your Home, and the IRS sale-of-residence tax guidance to review eligibility and reporting.

How Do You Calculate the Gain?

Your taxable gain is not simply the sale price minus the original purchase price. A simplified starting framework is:

Capital improvements that add value, prolong useful life or adapt the home to new uses may increase basis. Routine maintenance generally does not. Publication 523 includes worksheets and examples, but keep invoices, permits, closing statements and depreciation records for your tax professional.

What If the Home Was Rented or Used for Business?

Rental or business use does not always eliminate the home-sale exclusion, but it can make part of the gain taxable. Under IRS rules, gain attributable to depreciation allowed or allowable for periods after May 6, 1997 generally cannot be excluded. Periods of nonqualified use after 2008 may also reduce the excludable amount, subject to exceptions.

Do not estimate depreciation from memory. A CPA should review prior returns, including depreciation you were entitled to claim even if you did not claim it. The tax rate on unrecaptured Section 1250 gain and the reporting treatment can differ from the general long-term capital-gain rates.

What Federal Rate Applies to Any Taxable Gain?

Do not automatically multiply taxable gain by 15% or 20%. Federal net capital gains can be taxed at 0%, 15% or 20% depending on taxable income and filing status, while depreciation-related gain can have a different maximum rate. Higher-income taxpayers may also owe the 3.8% Net Investment Income Tax on the applicable amount.

The IRS explains the NIIT and its thresholds at Net Investment Income Tax. Gain excluded under the main-home rules is not included in NIIT.

How Does Illinois Treat the Sale?

Illinois generally begins with federal adjusted gross income and applies state additions, subtractions, exemptions and credits. The Illinois individual income-tax rate is currently 4.95%. Because qualifying Section 121 gain excluded from federal gross income is generally not in federal AGI, it ordinarily does not enter Illinois income through that starting point. Taxable gain included federally can affect Illinois income.

Residency, a move during the tax year, ownership structure and other state adjustments can change the filing analysis. Review the Illinois Department of Revenue IL-1040 guidance and confirm the result with an Illinois tax professional.

Special Situations That Need Professional Review

• A spouse died, the home was inherited, or title changed.
• You are divorced or separated, or a former spouse occupied the home.
• You rented all or part of the property or claimed a home-office deduction.
• You used a home-sale exclusion within the previous two years.
• You moved out more than three years before the sale.
• The gain may exceed the available exclusion.
• You became a nonresident or part-year Illinois resident during the sale year.
• You received Form 1099-S or have incomplete basis records.

A surviving spouse may qualify for the $500,000 exclusion when a sale occurs no later than two years after the spouse's death and the other IRS conditions are met. Basis rules after death are separate and fact-specific; do not assume that only half—or all—of the property receives a basis adjustment without professional review.