Learn what Form 1098 reports, when mortgage interest and points may be deductible, which records to check, and why California may require an adjustment.
Form 1098, Mortgage Interest Statement, reports mortgage interest and certain related amounts received by a lender during the year. A lender generally files it when it receives at least $600 of mortgage interest, including certain points, from an individual in the course of its trade or business and the reporting rules apply.
The form helps prepare a return, but it does not determine the allowable deduction. The borrower must separately satisfy the itemization, secured-debt, qualified-home, loan-use, ownership, payment, and debt-limit rules.
Common boxes include:
The meaning of a box is not "deduct this amount." For example, prepaid interest can appear in box 1 even though the portion attributable to a later tax year is not currently deductible. Points may be currently deductible, amortized, or nondeductible depending on the transaction.
For a personal residence, federal home mortgage interest generally requires all of the following:
For 2025 federal returns, qualifying post–December 15, 2017 acquisition debt is generally limited to $750,000, or $375,000 if married filing separately. Higher $1 million and $500,000 limits can apply to qualifying debt incurred before December 16, 2017.
Interest on a home-equity loan or line of credit is not automatically deductible merely because the home secures the loan. The proceeds generally must be used to buy, build, or substantially improve the qualified home securing the debt.
Elena receives Form 1098 showing $24,000 in box 1. She and her spouse itemize deductions. Their mortgage was incurred in 2021 to buy their principal residence, and the average balance subject to the federal limit is $900,000.
The federal post-2017 acquisition-debt limit is $750,000. Elena should not automatically enter the entire $24,000 as deductible interest. The applicable Publication 936 worksheet determines the deductible portion using the loan balances and qualified-loan limit.
If part of the mortgage financed a separate rental property or business use, allocation and other forms may apply instead of treating the entire amount as personal Schedule A interest.
Qualified personal home mortgage interest and points reported on Form 1098 generally appear on Schedule A for the applicable line in 2025. Interest not reported on Form 1098 and points not reported on Form 1098 have separate Schedule A lines and documentation requirements.
Interest attributable to rental property may belong on Schedule E. Business interest may belong on Schedule C, Form 8825, or another business form, subject to applicable limits. The form received does not override the use of the proceeds or the property's tax classification.
Points paid to acquire a principal residence may be currently deductible when all requirements are met. Refinancing points generally must be deducted over the loan term, although special treatment can apply when the mortgage ends.
Box 5 may report mortgage insurance premiums, but the existence of a reported amount does not guarantee a federal deduction for the year. Check current law.
Box 4 reports refunded mortgage interest. A refund of interest deducted in an earlier year may be taxable under the tax-benefit rule to the extent the earlier deduction reduced tax.
Only one borrower may receive Form 1098 even when multiple people are named on a loan. The form recipient cannot automatically claim all the interest, and another borrower cannot claim an amount merely because of being named on the mortgage. Each person needs evidence of legal liability, ownership when required, and actual payment.
A missing Form 1098 does not by itself eliminate a valid deduction. Seller-financed interest and interest below the lender-reporting threshold can require other documentation and reporting.
California itemized deductions begin with federal Schedule A concepts but do not always match federal law. For 2025, California does not conform to the federal reduction of the acquisition-debt maximum from $1 million to $750,000. A taxpayer whose federal deduction was limited may have a California adjustment on Schedule CA (540) or Schedule CA (540NR).
This does not mean California permits every amount on Form 1098. The debt still must satisfy California's applicable requirements, and other federal-state differences may apply. Maintain the mortgage statements and loan-use records needed to calculate both returns.
Heath Income Tax can review mortgage and property records, calculate federal limits, allocate mixed-use interest, and prepare California adjustments.
Is every amount in Form 1098 box 1 deductible?
No. The amount must satisfy the applicable mortgage-interest rules and may be limited.
Where do I report Form 1098?
Qualified personal home mortgage interest generally appears on Schedule A. Rental or business interest may belong elsewhere.
Can I deduct interest if I did not receive Form 1098?
Possibly. The underlying legal and payment requirements control, but additional documentation and reporting may be required.
Does California use the same mortgage limit?
Not always. California did not conform to the federal reduction from the $1 million acquisition-debt maximum to $750,000 under the rules discussed in the 2025 Schedule CA instructions.
The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.
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