Form 6252 for Seller Financing Installment Sales

What Form 6252 is and who needs to file it

Form 6252, Installment Sale Income, is the IRS form used to report income from an installment sale, which is any sale where you receive at least one payment after the tax year in which the sale happened. If you sold a property or a business and you are collecting the price in monthly payments instead of a lump sum, you made an installment sale, and Form 6252 is how the taxable portion of each year's payments gets calculated on your federal return.

The form is filed by the seller, not the buyer, and it is filed for every year in which you receive a payment, not just the year of the sale. The year of sale establishes the numbers the whole schedule depends on, the selling price, your basis, and the resulting gross profit, and each following year applies those numbers to whatever principal you collected. If you have federal filing obligations, confirm with a CPA how the installment method applies to your specific sale, especially for Puerto Rico residents whose federal and Hacienda obligations differ by situation.

How installment sale income applies to seller financed deals

Seller financing is the classic installment sale. You sold the property, the buyer signed a note, and now the price arrives over years of monthly payments. The installment method exists so you do not pay tax on the entire gain in the year of the sale when you have only received a fraction of the money. Instead, each year you recognize the slice of your gain that corresponds to the principal you actually collected that year.

This applies whether the deal was a house, a rental property, or a small business sold with owner financing. It does not apply to sales at a loss, and inventory and dealer sales follow different rules, so the first question is always whether your sale qualifies for the installment method at all. For the typical individual who seller financed one property, it usually does, but the edge cases are exactly where professional review earns its fee.

Reporting gross profit percentage and interest separately

The engine of Form 6252 is the gross profit percentage: your gross profit divided by the contract price. If you sold for $200,000 and your gross profit was $80,000, the percentage is 40 percent, and 40 cents of every dollar of principal you collect is taxable installment sale income. The rest of each principal dollar is a return of your own basis and is not taxed. That percentage is set in the year of sale and applied consistently for the life of the note.

Interest is the other stream, and it never touches the gross profit calculation. Every payment the buyer makes splits into principal and interest, and the interest portion is ordinary interest income reported separately on your return, not on Form 6252. This is why clean books matter: to fill out the form you need the year's principal collected, kept strictly apart from the year's interest collected, for every year the note is alive.

Form 6252 vs Form 1098, what each form covers

The two forms answer different questions for different parties. Form 6252 is the seller's calculation of their own taxable gain from the principal received. Form 1098 is an information statement about the interest the borrower paid, issued so the borrower can support their mortgage interest deduction. Same loan, same payments, two different slices reported to two different audiences.

For a seller financed mortgage in Puerto Rico there is often a third piece, Form 480.7A, the Hacienda-side informative return covering the interest received. A seller lender can therefore touch all three in one tax season: 480.7A for Puerto Rico, 1098 for the federal interest statement, and 6252 for their own installment gain. None of them replaces another, which is why tracking the underlying payment data once, correctly, matters more than any individual form.

How Lend. helps you track the numbers Form 6252 requires

Everything Form 6252 asks for is a function of your payment history: how much principal came in this year, how much interest came in this year, and what your gross profit percentage is. Lend. stores the gross profit percentage on the mortgage and splits every confirmed payment into principal and interest against the amortization schedule, so those totals accumulate correctly all year instead of being reconstructed from bank statements in April.

At year end, Lend. generates a Form 6252 record per mortgage per tax year, with the principal received, the installment income computed from your gross profit percentage, and the interest received listed separately, alongside the Form 480.7A and 1098 records generated from the same payment data. You and your CPA review numbers that were tracked payment by payment, not estimated. 60-day free trial, no credit card required.