The Number That Decides Your Tax Bill on an Inherited House

A house doesn’t keep its old price tag when it passes to you. The moment someone dies, the property gets revalued for tax purposes — and Kiplinger reports that getting this number wrong, in either direction, can mean an audit or an unnecessarily large capital gains bill down the line.

The stepped-up basis, explained

When you inherit property, your “basis” — the number used to calculate gain or loss when you eventually sell — isn’t what the original owner paid for it decades ago. It’s the fair market value on the date they died. This is called a stepped-up basis, and it’s one of the more generous quirks in the tax code: if a parent bought a house for a modest sum years ago and it’s now worth several times that, you don’t inherit their original purchase price and the tax bill that would come with it. You inherit the current value instead.

That sounds like a windfall, and often it is. But it only works cleanly if the “current value” on record is accurate. Underestimate it and you’ve understated your future gain when you sell, which the IRS can flag. Overestimate it and you may have paid for a valuation that doesn’t hold up, or invited scrutiny for the opposite reason.

Why the appraisal matters more than any receipt

With most assets, you keep a receipt. With a house, the substitute is a professional appraisal dated as close as possible to the date of death, ideally from someone qualified to defend that number if the IRS asks questions later. A casual estimate from a property website, or a figure a family member remembers being mentioned once, isn’t documentation — it’s a guess, and guesses are exactly what invite an audit.

The stakes usually surface years after the fact, not immediately. Families often don’t think about valuation at all until the property is sold, at which point the difference between the sale price and the stepped-up basis is the taxable gain. If nobody got a proper appraisal at the time of inheritance, you’re left trying to reconstruct a fair market value from years earlier — a much harder and less convincing exercise than getting it right at the time.

What this means for your week

If you’ve recently inherited a property, or expect to, the practical task isn’t emotional — it’s paperwork. Get a qualified appraisal dated to the death of the owner, keep it somewhere permanent, and don’t rely on informal estimates. If the inheritance happened years ago and no appraisal exists, it’s worth asking a tax professional now, before a sale forces the question, rather than after.

Reported at Kiplinger; analysis ours.