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IRS Form 1098: Mortgage Interest Statement Explained
How to use Form 1098 to claim the mortgage interest deduction. Covers the $750,000 debt limit, points, PMI, and why fewer homeowners benefit from itemizing.
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How to use Form 1098 to claim the mortgage interest deduction. Covers the $750,000 debt limit, points, PMI, and why fewer homeowners benefit from itemizing.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
Form 1098 is the Mortgage Interest Statement; the document your lender sends each January reporting how much mortgage interest you paid during the year. For decades, the mortgage interest deduction was the cornerstone of homeowner tax benefits. But the Tax Cuts and Jobs Act of 2017 reshaped the landscape dramatically: it capped the deductible mortgage debt at $750,000 (down from $1 million), eliminated the deduction for most home equity loan interest, and nearly doubled the standard deduction; meaning far fewer homeowners now benefit from itemizing at all.
The mortgage interest deduction is one of the oldest provisions in the U.S. tax code. When the modern income tax was established by the Revenue Act of 1913, all personal interest payments; including mortgage interest — were deductible. This was not specifically designed to encourage homeownership; it was simply a broad policy that treated interest as a cost of earning income.
Over time, the mortgage interest deduction became politically untouchable, widely regarded as a pillar of the "American Dream" of homeownership. Congress eliminated the deduction for most personal interest (credit card interest, car loan interest, etc.) in the Tax Reform Act of 1986, but preserved the mortgage interest deduction. The 1986 act set the original $1 million cap on acquisition indebtedness and allowed interest on up to $100,000 of home equity debt.
Form 1098 became the standard reporting mechanism for lenders. Any financial institution that receives $600 or more in mortgage interest from a borrower during the year must issue a Form 1098 by January 31. The form reports the interest paid, points paid on purchase (which are also deductible), the outstanding mortgage principal, property tax paid from escrow, and — since 2016; the address of the property securing the mortgage.
The TCJA of 2017 made the most significant changes to the mortgage interest deduction in over 30 years. For mortgages originating after December 15, 2017, the cap was reduced to $750,000. The home equity interest deduction was eliminated entirely unless the equity funds were used for home improvement (buying, building, or substantially improving the home securing the debt). Perhaps most impactfully, the doubling of the standard deduction to $24,000 for married couples meant that millions of homeowners who previously itemized found the standard deduction more advantageous.
You do not file Form 1098; your mortgage lender files it with the IRS and sends you a copy. You receive the form and use the information to claim the mortgage interest deduction on Schedule A (Itemized Deductions) of your Form 1040.
To deduct mortgage interest, you must:
For most homeowners, no. The Tax Cuts and Jobs Act nearly doubled the standard deduction ($15,000 single, $30,000 married in 2026) while capping deductible mortgage debt at $750,000 and limiting state and local tax deductions to $10,000. Only homeowners with large mortgages, high state taxes, or significant other itemized deductions typically benefit from itemizing.
Form 1098 reports mortgage interest paid (Box 1), outstanding mortgage principal (Box 2), mortgage origination date (Box 3), refund of overpaid interest (Box 4), mortgage insurance premiums (Box 5), and points paid on purchase (Box 6). Your lender sends this form by January 31 each year.
Only if the loan funds are used to buy, build, or substantially improve the home that secures the loan, and the total mortgage debt stays under $750,000. The TCJA eliminated the deduction for home equity interest used for other purposes (debt consolidation, vacations, etc.) through 2025.
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The applicable mortgage limits are:
This is the total interest you paid on the mortgage during the calendar year. This is typically the amount you enter on Schedule A, Line 8a, assuming your mortgage does not exceed the applicable limit.
The outstanding balance of the mortgage as of January 1 of the reporting year. This helps the IRS verify whether your mortgage exceeds the deduction limit. If you have multiple mortgages totaling more than $750,000, you must prorate the deductible interest.
The date the mortgage originated. This determines which cap applies; $750,000 for post-December 15, 2017 mortgages or $1,000,000 for grandfathered mortgages.
Private mortgage insurance (PMI) premiums paid during the year. The deductibility of PMI has been extended and expired multiple times. Check current law to determine whether this amount is deductible in the current tax year.
Points (prepaid interest) paid at closing on the purchase of a primary residence. Generally, points paid to obtain a mortgage for buying or building your main home are fully deductible in the year paid. Points paid for refinancing must be amortized over the life of the loan.
Real estate taxes paid from escrow during the year. This amount may be deductible on Schedule A, subject to the $10,000 SALT (State and Local Tax) deduction cap imposed by the TCJA.
The TCJA provisions affecting mortgage interest are currently set to expire after 2025. If they expire without extension, the mortgage debt cap would revert to $1 million, the home equity interest deduction would be restored for all purposes, and the standard deduction would return to pre-TCJA levels. This would significantly increase the number of homeowners who benefit from itemizing and deducting mortgage interest.
However, as of 2025, there is significant legislative uncertainty about whether these provisions will be extended, modified, or allowed to expire. Homeowners and prospective buyers should monitor developments closely, as the outcome could substantially affect the after-tax cost of homeownership.
For more information, visit the official IRS page for Form 1098.
This article is educational and does not constitute tax advice. Consult a qualified tax professional for guidance specific to your situation.
Should you itemize or take the standard deduction? Compare 2024, 2025, and 2026 amounts, learn the SALT cap impact, and use our step-by-step process to.