Sibling Buyout Calculator: What a Fair Price for the Inherited House Looks Like

Nobody wants to be the one who brings up money, least of all over a house a parent just left behind. But a number nobody says out loud is harder on a family than one they do, because everyone quietly fills in their own. This page puts the number somewhere neutral: the standard formula, a calculator to run it with real figures, and the seller-financed option many families never hear about.

How do you calculate a sibling buyout?

Estate attorneys, mediators, and courts all start from the same short formula: appraised fair market value − outstanding mortgage and liens = equity. Each owner's buyout price is their share of that equity - not of the sale price, and not of the original purchase price. Here is the usual three-sibling case:

Two notes. First, the mortgage doesn't go away. The buyer usually refinances the house into their own name at closing, which pays off the old loan (so the departing siblings come off the note) and can raise the buyout cash in the same step. Second, the deed transfer is ordinary paperwork. A title company or real estate attorney handles it, and there is no agent commission on a family transfer.

What would the buyout cost with your numbers?

What if nobody agrees on the value?

Fights over value sink more sibling buyouts than money does, because each side quietly starts from a different number. One remembers what the neighbor's house sold for. Another remembers what Dad paid. The neutral fix is a licensed appraisal. Some families jointly order one appraisal and agree, in advance and in writing, to be bound by it. Others have the buyer and the sellers each order their own and average the two, bringing in a third appraiser only if the first two land far apart. Which method you pick matters less than picking it before anyone sees a number.

An online estimate is a place to start talking, not a valuation. Nobody compared real sales to get it, and nobody stands behind it. For an inherited house, the estate may already hold an appraisal from the date of death; if much time has passed, most families get a new one, since the buyout should reflect what the house is worth now. Date-of-death value still matters for the sellers' cost basis, so have a CPA in your state confirm how both numbers get used.

Can a sibling finance the buyout instead of paying cash?

Yes, and for many families it is the difference between a buyout and a standoff. The departing siblings act as the lender: the buyer signs a promissory note, secured by the house, and pays it down monthly like any mortgage. The siblings earn the interest a bank would have earned, and the buyer skips a cash-out refinance at bank rates.

The one hard rule: charge at least the Applicable Federal Rate for the note's term. Below the AFR, the IRS can treat the interest you didn't charge as a gift from the lending siblings to the buyer, with tax paperwork to match. So a family discount on the rate is rarely worth it. If you want to be generous, discount the price instead. This is a question for a CPA, so confirm the setup with one in your state. The Family Matters family loan calculator picks the correct AFR tier for any term and shows the full payment schedule.

What if a sibling won't sell - or won't agree at all?

Any co-owner can generally file a partition action asking a court to divide or sell the property - and in many states the Uniform Partition of Heirs Property Act now gives the other co-owners a right to buy out the filer's share at appraised value before a forced sale. Know it exists, not as a threat but for perspective: a court settles a deadlock with an appraisal and the same equity math on this page, minus legal fees and minus the relationship. If talks have truly stalled, talk to an attorney in your state. Often just mentioning a mediator gets everyone back to the table first.

How do you keep the buyout fair on paper?

Whatever the family decides, write it down while everyone still agrees: the appraised value and how it was set, any selling-cost offset, each share, the note's rate and term, and every payment made. Memory is the worst ledger in any family, and most buyout resentment goes back to a number someone remembers differently.

The same is true of the months - sometimes years - of co-ownership before a buyout closes, or after a family decides not to buy anyone out at all. Someone pays the insurance, someone covers the furnace repair, and the running total lives in one sibling's head. The House Matters module from House Matters records each expense the moment it happens and keeps a running who-owes-what everyone can see, alongside the stays calendar, maintenance from photo-flag to fixed, and professional home-watch visit reports. Money still moves between siblings the way it always has. What changes is that the record is shared, up to date, and nobody's chore.

If the family keeps the house together, put the rest of the rules on paper too: a family agreement covers use, costs, and exits, and some families go further with a trust or LLC to hold title. And for the ongoing cost split itself, the cabin expense split calculator covers the fair-share question this page doesn't.

Frequently asked questions

How is a sibling buyout usually calculated?

Appraised fair market value minus the outstanding mortgage and liens equals the equity; each sibling's buyout price is their ownership share of that equity. With three equal owners of a $600,000 house carrying $150,000 of debt, each share is worth $150,000.

Do I need a real estate agent to buy out my sibling?

No. A family transfer has no listing and no commission. A title company or real estate attorney prepares the deed and handles the closing. That saved commission is why some families take selling costs off the appraised value, though plenty don't.

What interest rate do I have to charge my sibling on a buyout note?

At least the Applicable Federal Rate for the note's term. For November 2026 that floor is 5.08% annual for notes of three to nine years and 5.52% for longer notes, per Rev. Rul. 2026-21. The IRS publishes new rates every month, so use the rate in effect when the note is signed.

Does buying out a sibling from an inherited house trigger capital gains tax?

Possibly for the selling siblings, though inherited property generally takes a stepped-up basis at the date of death, so a sale soon afterward often produces little or no gain. The longer the gap and the more the house gains in value, the more this matters. Confirm with a CPA in your state before closing.

Can one sibling be forced to sell an inherited house?

In most states a co-owner can ask a court for partition, which usually ends in a buyout at the appraised value or a sale. Many states' heirs-property laws first give the family a chance to purchase the petitioning sibling's share at appraised value. This is a question for an attorney in your state, and usually a reason to try mediation first.