Spreads recognition of a sale’s gain proportionally across each principal payment received, rather than recognizing it all at once in the year of sale.
How it works
The gross profit ratio (gain divided by sale price) is computed once at the time of sale. That same ratio applies to every principal payment received — including the down payment — to find the taxable gain recognized on each one.
What this does not include
This doesn’t include interest income on the deferred payments (installment sales typically also charge interest on the outstanding balance), which is taxed separately as ordinary interest income, not as part of the gain.
How to use this calculator
- Enter the sale price, adjusted basis, down payment, and years to spread the remaining principal.
Frequently asked questions
Why use an installment sale instead of recognizing the full gain immediately?
Spreading gain recognition over multiple years can keep the seller in a lower tax bracket each year, compared to a large lump-sum gain that might push them into a much higher bracket in a single year.
Can an installment sale be used for any type of property?
No — certain property types (like publicly traded securities) generally don’t qualify for installment sale treatment and require full gain recognition in the year of sale.
What happens if the seller dies before all payments are received?
The remaining installment obligation generally passes to the seller’s estate or heirs, who continue recognizing gain on the same gross profit ratio as payments are received.
