Can I Deduct My STR Loan Interest?
No credit card required
Yes — mortgage interest on a dedicated short-term rental property is fully deductible as a business expense on Schedule C Line 16 under IRC §163(a). Unlike the personal home mortgage deduction (which goes on Schedule A and is subject to limits), business interest on rental property has no dollar cap and reduces your self-employment income directly. Your Form 1098 from the lender provides the exact interest amount.
Schedule C vs. Schedule A: The Critical Distinction
Personal mortgage interest (on your primary residence or second home) is an itemized deduction on Schedule A, subject to the $750,000 loan limit under the Tax Cuts and Jobs Act. Many taxpayers cannot use this deduction because their standard deduction exceeds their itemized deductions.
Business interest on a dedicated STR property is an entirely different deduction. It goes on Schedule C Line 16 as a business expense, directly reducing your rental business income. There is no loan balance cap for business interest deductions under IRC §163(a), and it reduces your net income for both income tax and self-employment tax purposes.
On a $400,000 STR mortgage at 7% interest, you pay approximately $28,000 in interest in Year 1. At a 22% income tax rate plus 15.3% self-employment tax, that's up to $10,444 in annual tax savings from the interest deduction alone — and this is on top of your standard deduction, not competing with it.
What Types of Loan Interest Are Deductible
Purchase Mortgage on the STR Property
Schedule C, Line 16The primary mortgage used to purchase the STR property. All interest paid in the tax year is deductible. Your lender provides Form 1098 showing the total interest paid.
Business Loans for STR Purchases or Improvements
Schedule C, Line 16Interest on business loans, hard money loans, or bridge financing used to acquire or substantially improve an STR property is deductible under the tracing rules of IRC §163. The loan proceeds must be traceable to the business use.
Home Equity Loans Used for STR Improvements
Schedule C, Line 16 (business portion)If you took out a home equity loan (HELOC or lump-sum) and used the proceeds to fund improvements to your STR property, the interest attributable to those proceeds is a business interest deduction on Schedule C, not a personal mortgage interest deduction on Schedule A. Keep records showing how you used the HELOC proceeds.
Form 1098: Your Documentation
Your mortgage lender will send you Form 1098 by January 31 showing the total mortgage interest paid during the prior year. Box 1 shows the interest paid — this is the amount you deduct on Schedule C Line 16.
If your property is a dedicated STR (no personal use), the full Box 1 amount is deductible. Keep your Form 1098 with your tax documents each year.
The IRS may compare your Schedule C Line 16 interest deduction against Form 1098 data reported by your lender. Make sure the amounts match. If you have multiple loans or if interest was paid to private lenders (who may not file 1098), maintain your own records of all interest payments.
Mixed-Use Property: Allocating Loan Interest
If the property serves both rental and personal use, you must allocate the mortgage interest. Use the same allocation ratio as your other property expenses: rental days divided by total use days. The rental-use portion goes on Schedule C Line 16; the personal-use portion may be deductible on Schedule A as qualified residence interest (subject to the standard deduction / itemized deduction comparison).
You cannot deduct the same interest on both Schedule C (business) and Schedule A (personal). Each dollar of mortgage interest can only be deducted once. The allocation method determines which schedule receives each portion of the interest. Document your allocation clearly and consistently.
Track Loan Interest Payments Automatically
DeductFlow imports your mortgage and loan payments, separates principal from interest, and posts the interest amount to Schedule C Line 16. Your biggest single deduction is handled automatically.
Start Tracking Free →Pro from $19/month or $149/year · 7-day free trial · No credit card required
Related Reading
No credit card required
Disclaimer
This article is for informational purposes and does not constitute tax, legal, or financial advice. Tax rules vary based on your specific situation, filing status, entity structure, and jurisdiction. Always consult a qualified CPA or tax professional for guidance on your specific tax situation. IRS rules and thresholds are subject to change — verify current requirements at irs.gov before filing.