Seller Financing Tax Treatment and Installment Sales (2026)

Seller financing solves a cash flow problem for the buyer and a tax problem for the seller. Under IRC Sec. 453, gain is recognized as payments are received rather than all at once, which can keep a seller out of the top bracket and away from the net investment income tax.

There are three traps that catch sellers who assume the deferral is complete. Depreciation recapture is not deferred. Interest must be adequate or the IRS will impute it. And the note itself has consequences if the seller later disposes of it or dies.

The Installment Method Mechanics

Under IRC Sec. 453, each principal payment received carries out gain in the same proportion that total gain bears to the total contract price. That ratio is the gross profit percentage.

On a property sold for $1,400,000 with an adjusted basis of $600,000, gross profit is $800,000 and the gross profit percentage is roughly 57.1%. A $200,000 down payment carries out $114,200 of gain. Each subsequent principal payment does the same until the note is retired.

Interest received is separately taxable as ordinary interest income in the year received. It is not part of the installment gain computation.

The installment method applies automatically to a qualifying sale. You must affirmatively elect out under IRC Sec. 453(d) if you want to recognize all gain in the year of sale, which is occasionally the right answer when the seller has expiring losses or an unusually low-income year.

Depreciation Recapture Is Not Deferred

This is the trap that surprises sellers most. Under IRC Sec. 453(i), depreciation recapture under IRC Sec. 1245 and IRC Sec. 1250 is recognized in full in the year of sale, regardless of how little cash was received.

For a seller who ran a cost segregation study and has substantial Sec. 1245 property, this can be a significant amount of ordinary income due immediately with almost no cash to pay it. A property sold with a $50,000 down payment and $340,000 of Sec. 1245 recapture creates a tax bill exceeding the cash received.

The planning answer is to size the down payment against the recapture liability rather than against a rule of thumb. A seller with heavy recapture needs more cash at closing, and that is a negotiating point that should be raised early.

Unrecaptured Sec. 1250 gain, the straight-line depreciation on the building taxed at up to 25%, does spread under the installment method. It is treated as recognized first as payments come in, before the lower-rate capital gain, which is a detail that affects year-by-year projections.

Interest Must Be Adequate

If the note does not charge adequate stated interest, the IRS will impute it under IRC Sec. 483 or the original issue discount rules of IRC Sec. 1274, depending on the transaction. The effect is to recharacterize part of what the parties called principal as interest.

This matters because it converts capital gain into ordinary interest income for the seller. A seller who agreed to a 2% note on a $1,200,000 sale to help the buyer will find a meaningful portion of the principal recharacterized.

The threshold is the applicable federal rate published monthly by the IRS. Charging at or above the relevant AFR avoids imputation entirely. There is no reason to go below it, since a below-market rate helps the buyer's cash flow but costs the seller in rate arbitrage that the code neutralizes anyway.

What Happens If the Seller Disposes of the Note

Selling, gifting, or pledging the installment note accelerates the remaining gain. Under IRC Sec. 453B, disposition of an installment obligation triggers recognition of the deferred gain immediately.

Pledging is the version sellers stumble into. Under IRC Sec. 453A(d), using the installment obligation as security for a loan is generally treated as a payment on the obligation, accelerating gain to the extent of the loan proceeds. A seller who borrows against the note has effectively cashed it out for tax purposes.

There is also an interest charge under IRC Sec. 453A on large installment obligations. Where the face amount of all installment obligations arising in a year and outstanding at year end exceeds $5,000,000, the seller owes interest on the deferred tax. This applies to larger commercial transactions and should be modeled where relevant.

Death and Basis

Installment notes do not receive a stepped-up basis at death. Under IRC Sec. 691, the remaining deferred gain is income in respect of a decedent, taxable to the estate or beneficiaries as payments come in.

This is a meaningful difference from holding the property itself, which would receive a basis step-up under IRC Sec. 1014. A seller in poor health or advanced age is trading a full step-up for a rate deferral, and that is usually a bad trade.

For an older seller, holding the property and passing it to heirs with a stepped-up basis frequently beats selling on an installment note. The heirs can then sell with little or no gain. This should be modeled explicitly rather than assumed either way.

Worked Example: Seller-Financed Commercial Sale

A seller disposes of a small commercial building for $1,850,000. Adjusted basis is $740,000 after 14 years of depreciation totaling $460,000, of which $180,000 is Sec. 1245 property from a prior cost segregation study.

Terms are $370,000 down and a $1,480,000 note at 7.25% over 15 years with a balloon at year seven.

In the year of sale, the $180,000 of Sec. 1245 recapture is fully taxable as ordinary income under IRC Sec. 453(i), regardless of the installment method. That is roughly $67,000 of federal tax against $370,000 of cash received, which is manageable but would not have been on a $100,000 down payment.

The remaining gain of $930,000 spreads. Gross profit percentage applies to each principal payment, and the $280,000 of unrecaptured Sec. 1250 gain is layered out first at the 25% rate before the balance is taxed at long-term capital gain rates.

By spreading the gain across seven years to the balloon, the seller stays below the threshold for the top capital gain rate in most years and reduces net investment income tax exposure meaningfully.

Frequently Asked Questions

Does seller financing defer all of my tax?

No. Depreciation recapture under IRC Sec. 1245 and Sec. 1250 is recognized in full in the year of sale under IRC Sec. 453(i), regardless of how little cash you receive. Only the remaining capital gain spreads across payments. Size your down payment against the recapture liability.

What interest rate do I have to charge?

At least the applicable federal rate for the term of the note. Below that, the IRS imputes interest under IRC Sec. 483 or Sec. 1274, converting part of your principal into ordinary interest income. There is no benefit to charging below the AFR.

Can I borrow against my installment note?

Not without consequences. Under IRC Sec. 453A(d), pledging an installment obligation as security for a loan is generally treated as receiving payment, accelerating the deferred gain to the extent of the loan proceeds. Selling or gifting the note triggers acceleration under IRC Sec. 453B.

What happens to an installment note when I die?

It does not get a basis step-up. Under IRC Sec. 691 the remaining deferred gain is income in respect of a decedent, taxable to your estate or heirs as payments arrive. For an older seller, holding the property for a full step-up under IRC Sec. 1014 often beats an installment sale.

Can I choose not to use the installment method?

Yes. The installment method applies automatically, but you may elect out under IRC Sec. 453(d) and recognize all gain in the year of sale. This is occasionally the right choice when you have expiring capital losses, net operating losses, or an unusually low income year.

Seller Financing and Installment Sales: How the Tax Actually Works