How should I report interest income from an installment sale?

Interest income from an installment sale must be reported separately as ordinary interest income, not as part of the installment sale gain.

• Interest → taxable as ordinary income
• Principal portion → reported under the installment sale rules

1. Understand what an installment sale is

An installment sale occurs when:

• You sell property, and
• You receive at least one payment after the year of sale

Each payment you receive generally includes:

1. Return of basis (non-taxable)
2. Capital gain (or ordinary gain, depending on the asset)
3. Interest (taxable as ordinary income)

2. How the interest portion is taxed

The interest portion of each installment payment:

• Is taxed as ordinary income
• Is not eligible for capital gains rates
• Is reported separately from the installment gain

This applies whether:

• The interest rate is stated in the contract, or
• The IRS imputes interest under below-market loan rules

3. Where to report installment sale interest on your tax return

If you are an individual

• Report the interest as interest income on Schedule B (Form 1040)
• Include it with other taxable interest (bank interest, CDs, etc.)

If the payer issued Form 1099-INT

• The interest will appear in Box 1 (Interest Income)
• You must report it, even if you didn’t physically receive the form

4. Reporting the principal and gain

The non-interest portion of the payment is reported on:

• Form 6252 - Installment Sale Income
• Then flows to:
  
  • Schedule D (capital assets), or
  • Schedule C / Form 4797 (business or depreciable property)

Do not include interest on Form 6252, only the sales price, basis, and gain.

5. Imputed interest rules

If the installment sale contract:

• Charges little or no stated interest, or
• Uses a rate below the IRS minimum

The IRS requires imputed interest under:

• IRC §483 or
• IRC §1274

In that case:

• Part of each payment is recharacterized as interest
• That amount is still reported as ordinary interest income

6. Special cases to be aware of

• Dealer dispositions → special rules may apply
• Related-party installment sales → accelerated gain rules possible
• Sale of depreciable property → depreciation recapture may be ordinary income

Summary

• Always report installment sale interest as ordinary income
• Do not include interest in Form 6252
• Schedule B + Form 6252 are both required

Sources:

• IRS Publication 537 - Installment Sales
• Form 6252 Instructions - Installment Sale Income
• IRS Publication 525 - Taxable and Nontaxable Income
• Internal Revenue Code §453 - Installment Method
• Internal Revenue Code §1274 - Determination of Issue Price in the Case of Certain Debt Instruments