Mortgage interest is not automatically deductible just because a lender issued Form 1098. A homeowner generally must itemize on Schedule A, the debt must be secured by a qualified home, and the loan proceeds and debt limits must satisfy federal rules. As of September 10, 2026, the IRS had not yet posted Publication 936 specifically for 2026 returns, so final filing should use the 2026 publication and Schedule A instructions when released.
Information checked: September 10, 2026.
Itemizing is required
Qualified home mortgage interest is claimed on Schedule A. If the standard deduction is larger than total itemized deductions, the mortgage interest may not reduce federal taxable income. State rules can differ.
Qualified home and secured debt
The loan generally must be secured by the main home or a qualified second home. A qualified home has sleeping, cooking and toilet facilities. Rental use, business use, construction periods and more than two homes can change the treatment.
Debt limits and dates
For acquisition debt taken out after December 15, 2017, the common federal limit is $750,000, or $375,000 for married filing separately. Qualifying older debt can be subject to the $1 million or $500,000 limit. Refinancing usually preserves only the balance of qualifying acquisition debt unless new proceeds qualify.
Home-equity interest
The label HELOC or home-equity loan does not decide deductibility. Interest is generally deductible only to the extent the proceeds were used to buy, build or substantially improve the home securing the loan. Paying credit cards, tuition or personal costs normally does not meet that use test.
Reconcile Form 1098
Review interest, points, outstanding principal and address information. Multiple refinances, seller-paid points, private financing or a mortgage below the reporting threshold may require records beyond Form 1098. Use the current Publication 936 worksheet when limits apply.
Action checklist
Start at the official agency page linked below and confirm that it applies to your location, tax year, account, property, or claim. Write down the deadline and the event that starts it. Gather notices, contracts, statements, payment records, identification, and dated correspondence before submitting. Save a complete copy, confirmation number, delivery proof, and the name of any agency representative. Review the resulting decision promptly and calendar every appeal or follow-up date.
Common mistakes to avoid
Do not rely on an undated search snippet, a commercial calculator, or a rule from another state or county. Do not assume an application pauses a lawsuit, collection action, tax deadline, or housing deadline unless the responsible authority confirms it. Avoid sending original records or sensitive information through an unverified link. When a deadline or legal consequence is disputed, obtain the written rule and consider qualified local advice.
Frequently asked questions
Does Form 1098 guarantee a deduction?
No. It reports lender information; the taxpayer must satisfy the deduction rules and itemize.
What is the post-2017 loan limit?
Commonly $750,000 of qualifying acquisition debt, or $375,000 married filing separately, subject to detailed rules.
Are HELOC payments deductible?
Interest may qualify only when proceeds meet the buy, build or substantially improve test for the securing home.
Summary
Keep Form 1098 and closing records, determine how loan proceeds were used, and compare itemized deductions with the standard deduction. Do not copy a lender's interest figure to Schedule A without checking the qualified-loan limits. Verify current agency instructions before acting.