Ask the Tax Editor, April 10: Questions on Selling a Home

Why It Matters

Understanding these rules can shave thousands of dollars off a homeowner’s tax bill and prevent costly filing errors, making them essential for anyone planning to sell a residence or mixed‑use property.

Key Takeaways

• Up to $250k/$500k home-sale gain exclusion for primary residence
• Improvements that add value or extend life increase tax basis
• Rental portion of a duplex disqualifies from full exclusion
• Inherited homes receive stepped‑up basis to fair market value
• Surviving spouse gets step‑up basis; no exclusion if not primary home

Pulse Analysis

The home‑sale exclusion remains one of the most powerful tax shelters for American homeowners, allowing up to $250,000 of gain—or $500,000 for married couples—to be excluded from federal income tax. This benefit hinges on the two‑out‑of‑five‑year ownership and use test, a rule that many sellers overlook until the closing table. When the exclusion is unavailable, the remaining profit is taxed at long‑term capital‑gain rates of 0%, 15% or 20%, depending on income, underscoring the importance of early planning.

Accurately calculating a property’s tax basis can dramatically reduce taxable gain. Homeowners should add the original purchase price, closing costs, and any capital improvements that increase value, extend useful life, or adapt the home for new uses—such as room additions, new HVAC systems, or finished basements. Conversely, routine repairs and maintenance do not boost basis. For mixed‑use properties like duplexes, the basis and eventual gain must be allocated between the personal residence portion and the rental or business portion, with the latter reported on Form 4797 and excluded from the primary‑residence shelter.

Special situations often create confusion but also opportunities for tax savings. Inherited homes receive a stepped‑up basis equal to the fair market value at the decedent’s death, effectively erasing prior appreciation. A surviving spouse who inherits jointly owned property also benefits from a step‑up, though the exclusion only applies if the home qualifies as a primary residence. For duplex owners, only the portion used as a personal residence qualifies for the $500,000 exclusion; the rental side must be treated separately. Savvy taxpayers keep meticulous records of improvements and consult a tax professional to maximize exclusions and minimize capital‑gain exposure.