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Why the same deal can win for both of you
The seller's tax picture is a second, separate reason terms can beat cash — with its own rules, its own disqualifiers, and its own AFR trap.
Everything in the previous lesson looked at terms from the buyer's side: what a below-market rate is worth to them. This lesson flips it around. A seller who carries a note instead of taking a lump sum often comes out ahead too — for a completely separate reason that has nothing to do with the interest rate at all: how the sale is taxed.
The §453 mechanism, briefly
Under Internal Revenue Code §453, a seller who receives payments over more than one tax year can generally recognize the taxable gain proportionally, as principal is actually collected, rather than all at once in the year of sale. On the reference deal — roughly $190,000 basis against a $315,000 sale price — taking the full gain in one year could push the seller into a higher capital-gains bracket, or across the income threshold that triggers the 3.8% net investment income tax, for that one year only. Spreading the same gain across a 20-year note can keep each year's recognized gain comfortably inside a lower bracket the whole way through.
Worth knowing — The part sellers forget
The interest a seller collects on a carried note is completely separate from the spread capital gain, and it's taxed in full as ordinary income every year it's received — never at capital-gains rates, and never spread by the gross-profit ratio. A seller comparing 'a $2,400/month note' against 'a $315,000 check' needs to know that a real slice of those monthly dollars is taxed differently than the rest, or the after-tax comparison is wrong before it starts.
Two disqualifiers worth knowing before you rely on this
- Dealer property: real estate held primarily for resale — most flips — cannot use §453 installment reporting at all. The full gain is taxed in the year of sale no matter how the payments are structured. This applies to the seller's intent for the specific property, not to the buyer or the note terms.
- State non-conformity: not every state follows the federal installment-sale treatment. Some tax the full gain in the year of sale regardless of what the IRS allows federally — check your specific state before assuming the state-tax math mirrors the federal math.
Compliance — AFR — the floor under the rate, on the seller's own note
If the note's stated interest rate is set too low relative to the Applicable Federal Rate published monthly by the IRS, the IRS can impute interest the parties never actually agreed to charge — creating phantom taxable interest income for the seller under rules like IRC §7872 or the original-issue-discount provisions, and potentially treating part of the below-market gap as a taxable gift from seller to buyer. This applies even on notes between family members, where a 0% or token-rate note is common and the AFR trap is most often missed. This is not tax advice — check the current AFR and confirm the note's rate against it with a CPA before finalizing terms.
One more wrinkle, specific to distressed and inherited property: if the lead you're working came through probate, the heir's basis in the property is typically stepped up to its fair market value at the date of death — which can erase most or all of the capital gain the calculator would otherwise compute for an owner who bought decades ago at a much lower price. For a probate seller, the entire tax argument for carrying a note over taking cash is often much weaker than it looks on paper. Always check the actual basis before assuming an installment sale saves an heir anything.
Put together, the buyer's terms-value math and the seller's tax math are two independent reasons the same deal can beat a straight cash sale for both sides at once — which is why seller financing, done with the legal and tax questions handled rather than skipped, is a genuinely win-win structure and not just a sales pitch for one.
Run it yourself
Check yourself
1. What determines how much a below-market seller-finance rate is actually worth to the buyer?
2. Why might the IRS impute interest on a 0% or below-market seller-financed note even if the parties never agreed to charge any?
3. A seller carrying a note instead of taking cash primarily benefits from which tax mechanism?