To calculate a house buyout, take the home’s current appraised value, subtract the mortgage payoff and any other liens, and multiply the remaining equity by the departing co-owner’s ownership share. A home appraised at $500,000 with a $300,000 mortgage payoff and equal ownership produces $200,000 in net equity and a $100,000 buyout price. Everything else in the process is getting each of those numbers right and handling the mortgage, title, and tax consequences that follow the payment.
Start With an Appraised Value You Can Defend
The calculation only works if the value you plug in reflects what the house is actually worth today. A licensed residential appraiser inspects the home, evaluates its condition, and compares it against similar recent sales nearby. The written report gives both sides a defensible number. A real estate agent’s comparative market analysis uses similar data but carries less formal weight, and if the buying party plans to refinance, the lender will require a certified appraisal anyway.
When each side hires its own appraiser and the figures come back far apart, the common fix is agreeing on a third independent appraiser whose number controls, or averaging all three. If a lender’s appraisal for the refinance looks wrong, the Consumer Financial Protection Bureau requires lenders to have a process for borrowers to request a reconsideration of value based on factual errors, poor comparisons, or evidence of bias.1Consumer Financial Protection Bureau. Mortgage Borrowers Can Challenge Inaccurate Appraisals Through the Reconsideration of Value Process A low appraisal can shrink the loan the buyer qualifies for and derail the entire buyout.
Subtract the Mortgage Payoff and Every Other Lien
Appraised value tells you what the home is worth on paper. To find what the co-owners actually own, subtract every dollar of debt attached to the property.
Request a payoff statement from your mortgage servicer. This is not the same as your monthly statement balance. A payoff figure includes remaining principal, interest accrued through a specific date, and any prepayment penalties. Federal law requires your servicer to provide an accurate payoff amount within seven business days of a written request.2Office of the Law Revision Counsel. 15 USC 1639g – Requests for Payoff Amounts of Home Loan
Then look past the primary mortgage. Home equity lines of credit, unpaid property tax liens, contractor liens from past renovations, and federal tax liens all reduce the equity available to split. A title search or title commitment surfaces these. Missing even a small secondary lien creates problems at closing, so do this step thoroughly.
Apply the Ownership Share
Net equity is fair market value minus total debt. In the running example, $500,000 minus $300,000 leaves $200,000. Multiply that figure by the departing owner’s share to get the buyout price.
Ownership share comes from the deed or a written co-ownership agreement. Most married couples and many co-owners hold title as joint tenants, which typically means equal shares. Tenants in common can hold any ratio. If ownership is 50/50, the buyout on $200,000 of equity is $100,000. If the departing owner holds 40% under an unequal contribution agreement, the buyout drops to $80,000.
Divorce changes this. A court may allocate equity differently from what the deed says, factoring in each spouse’s contributions, separate property claims, and other equitable considerations. The controlling number in that case is the one written into the settlement or decree, not the raw math from the deed.
Adjustments That Change the Final Number
Raw equity rarely tells the whole story. Co-owners regularly negotiate credits that shift the buyout up or down. If one party paid $15,000 out of pocket for a new roof while the other contributed nothing, the paying party might receive a credit that reduces their buyout obligation or increases their payout. Unpaid spousal support, shared credit card debt assigned in a divorce decree, and the cost of deferred maintenance the buyer will inherit can all factor in.
These get contentious when one party claims contributions that were never documented. The strongest position is a paper trail: receipts, bank transfers, contractor invoices. Any agreed adjustment belongs in a written settlement or buyout agreement signed before anyone transfers a deed or wires money.
Financing the Payment
Once you know the buyout price, the next question is where the money comes from. Unless the buyer has enough cash, a refinance is the standard method. The new loan has to be large enough to pay off the existing mortgage and cover the payment to the departing owner. In the running example, paying off a $300,000 mortgage and sending $100,000 to the other party means the buyer needs a $400,000 loan, plus closing costs if they are rolled in.
The buyer must qualify for that larger mortgage on a single income. For a conventional loan, Fannie Mae requires a minimum credit score of 620 for fixed-rate mortgages and 640 for adjustable-rate loans.3Fannie Mae. General Requirements for Credit Scores The lender also evaluates debt-to-income ratio. Refinance closing costs generally run 2% to 6% of the new loan balance, covering the appraisal, title insurance, origination fees, and recording charges. On a $400,000 loan, that adds $8,000 to $24,000 in costs. Decide upfront who absorbs those fees, because they directly affect how much the departing owner walks away with.
A cash buyout is simpler and cheaper: no origination fees, no lender appraisal, faster closing. The catch is that paying cash for the equity share does not eliminate a joint mortgage. If both names are on the loan, both stay on it until a refinance replaces it.
The Deed and the Mortgage Are Two Different Problems
This is where most buyouts go sideways. A deed controls who owns the home. A mortgage controls who owes the bank. Signing a quitclaim deed does nothing to remove a borrower from the loan. If both names remain on the mortgage after the transfer, the departing owner is still legally liable for the debt. Missed payments hit their credit, and the lender can pursue either borrower for the full balance.
The reliable way to remove a name is a full refinance in the buyer’s name alone, which pays off the joint loan and releases the departing owner. A less common alternative is a loan assumption with a release of liability, where the lender agrees to let one borrower take over the existing loan and formally release the other. Fannie Mae has a process for this that treats the transaction like a limited cash-out refinance.4Fannie Mae. DU Job Aids – Release of Liability Many lenders prefer a full refinance because it generates new origination fees, so releases can be difficult to obtain.
Most mortgages include a due-on-sale clause that lets the lender demand full repayment if the property changes hands. Federal law bars a lender from triggering that clause when the transfer runs to a spouse or former spouse as part of a divorce decree or separation agreement, and it also covers transfers where a borrower’s spouse or children become owners.5Office of the Law Revision Counsel. 12 USC 1701j-3 – Preemption of Due-on-Sale Prohibitions The exemption does not extend to transfers between unmarried co-owners, business partners, or unrelated co-heirs, and even for divorcing spouses it only stops the lender from calling the loan; it does not release the departing spouse from the debt.
Taxes Can Change What the Buyout Actually Costs
Tax treatment depends on the relationship between the parties, and the rules for divorce buyouts and everything else are completely different.
Between Spouses or Former Spouses
Property transfers between spouses as part of a divorce are nontaxable. Neither party recognizes gain or loss, and the buying spouse takes over the selling spouse’s original tax basis.6Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce The transfer must either occur within one year after the marriage ends or be related to the divorce.
That inherited basis matters later. If the couple bought the home for $200,000, the keeping spouse’s basis stays $200,000 even after paying $150,000 to buy out the other spouse years later. At the future sale, they can exclude up to $250,000 of gain as a single filer if they meet the ownership and use requirements.7Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
Between Unmarried Co-Owners
Unmarried partners, siblings, and co-investors do not get the divorce rules. The departing co-owner is selling a property interest, and that sale can trigger capital gains tax. The gain equals the buyout price minus the seller’s adjusted basis in their share. A departing owner who lived in the home as a primary residence for at least two of the last five years can exclude up to $250,000 of that gain.8Internal Revenue Service. Topic No. 701 – Sale of Your Home
If the buyout price sits significantly below fair market value, the IRS may treat the difference as a gift from the departing owner to the buyer. For 2026, the annual gift tax exclusion is $19,000 per recipient.9Internal Revenue Service. What’s New – Estate and Gift Tax A below-market discount larger than that may require the departing owner to file a gift tax return on Form 709, though actual gift tax is rarely owed because of the lifetime exemption.10Internal Revenue Service. Frequently Asked Questions on Gift Taxes This surfaces often in family buyouts where one relative offers another a discounted price on inherited property.
The Full Calculation, Start to Finish
Using the running example of a home appraised at $500,000 with a $300,000 mortgage payoff and 50/50 ownership:
- Fair market value from the appraisal: $500,000
- Total debts, including the mortgage payoff and any other liens: $300,000
- Net equity: $200,000
- Departing owner’s 50% share: $100,000
- Negotiated adjustments: subtract credits for repairs the departing owner paid, add unpaid shared debts assigned to them
- Final buyout price: $100,000 plus or minus adjustments
The arithmetic is the easy part. The complications live in qualifying for the refinance, making sure the departing owner is actually removed from the mortgage, handling the tax treatment correctly, and getting every adjustment written down before money changes hands. Skipping any of those steps is how a clean number on a spreadsheet turns into a years-long financial problem.