Form 1098, Home Mortgage Interest Statement, reports the amount of mortgage interest you paid during the tax year to your lender. This form enables eligible homeowners to claim a deduction on their federal income tax return under Internal Revenue Code ยง163.
The IRS requires lenders to issue Form 1098 to borrowers who paid $600 or more in mortgage interest during the year. The form includes your name, address, taxpayer identification number, and the total interest paid. Lenders must send copies to both the borrower and the IRS by January 31.
Homeowners use Form 1098 to report mortgage interest on Schedule A (Itemized Deductions) when claiming the mortgage interest deduction. The deduction reduces taxable income, potentially lowering the tax bill. Not all mortgage interest qualifies-only interest on loans secured by a primary or secondary residence is eligible.
Lenders calculate the interest portion of each mortgage payment based on the outstanding loan balance and the annual interest rate. For variable-rate loans, this amount changes monthly. The total interest paid over the year is reported on Form 1098.
If you paid less than $600 in mortgage interest, your lender is not required to issue Form 1098. However, you may still deduct the interest if you itemize deductions. In such cases, you must rely on your own records-such as monthly statements or a year-end summary from your lender-to document the amount.
For example, a homeowner with a $300,000 mortgage at 5.5% interest paid $16,500 in interest during the year. The lender issued Form 1098 reporting $16,500 in interest. The homeowner includes this amount on Schedule A, reducing their adjusted gross income by that amount, assuming they itemize.
To claim the mortgage interest deduction, the loan must be secured by a qualified home. This includes your primary residence and one additional home, such as a vacation property. Interest on loans used to buy, build, or improve a home qualifies. Interest on refinancing for non-home purposes does not.
The maximum deductible amount depends on the loan's origination date:
These limits apply to combined first and second mortgages. If you have a $900,000 mortgage, only $750,000 of interest is deductible. Excess interest cannot be carried forward or claimed in future years.
| Mortgage Origin Date | Maximum Loan Amount | Max Deductible Interest |
|---|---|---|
| Before Dec 16, 2017 | $1,000,000 | Interest on up to $1M debt |
| After Dec 16, 2017 | $750,000 | Interest on up to $750K debt |
A common error is assuming all interest paid counts toward the deduction. Interest on a home equity line of credit (HELOC) used for non-home purposes-like paying off credit cards-is not deductible. Only interest used to acquire, build, or improve a qualified home qualifies.
Form 1098 does not equal the amount you can deduct. The form reports total interest paid, but the IRS allows deductions only up to the statutory limit. If your mortgage exceeds the cap, you must reduce the reported amount on your tax return.
Another misconception is that Form 1098 is required to claim the deduction. It is not. You can claim the deduction using your own records if you itemize and meet the eligibility criteria. However, Form 1098 serves as official documentation and helps prevent errors during audits.
Some taxpayers confuse Form 1098 with Form 1099-INT, which reports interest earned on savings accounts or bonds. These forms serve different purposes. Form 1098 is for interest paid on a mortgage; Form 1099-INT is for interest received.
I once reviewed a client's return where the Form 1098 showed $12,000 in interest, but the actual payments totaled $14,500 due to prepaid interest. The client had paid six months' interest upfront in December. The lender included only the portion applied to the current year. I advised adjusting the deduction to reflect the full amount paid, which was allowable under IRS Publication 936.
Form 1098 is used primarily on Schedule A of Form 1040. Itemizers list mortgage interest as a deduction under "State and local taxes" and "Other itemized deductions." The deduction is subject to phaseouts for high-income taxpayers under the Pease limitation, though this was suspended for 2021-2025 under the Tax Cuts and Jobs Act.
Homeowners who itemize deductions benefit most. Those using the standard deduction cannot claim mortgage interest. For a single filer earning $120,000 with $15,000 in mortgage interest, switching from the standard deduction ($13,850 in 2023) to itemizing could save nearly $2,000 in taxes.
Even if you don't itemize, Form 1098 helps verify your interest payments. It supports claims for other benefits, such as the American Opportunity Tax Credit or education-related deductions, when documenting financial obligations.
If the amount on Form 1098 doesn't match your records, contact your lender. Discrepancies often arise from incorrect taxpayer ID numbers, late payments, or adjustments to principal balances. Lenders can correct the form and reissue it.
If the error persists, report the correct amount on your tax return and attach a letter explaining the difference. Keep copies of your payment history and correspondence with the lender. The IRS may request this documentation during an audit.
Form 1098 is not the only source of information. Your monthly mortgage statement shows interest paid per period. Aggregating these amounts gives a precise total. Use this data to cross-check the form.
Form 1098 is a critical tool for homeowners seeking to reduce their tax liability through the mortgage interest deduction. It reflects interest paid on qualifying loans and supports accurate reporting on federal tax returns. Always verify the amount against your own records to ensure compliance and maximize potential savings.