Schedule E. Line 12

Mortgage Interest
& Tracing Rules

It's usually your biggest deduction. But if you used that HELOC for a boat, deducting the interest is tax fraud. Here's how to get it right.

★ 5.0 on Google113 reviews4.9 from 114 BiggerPockets reviews1,000+ clientsAll 50 states, fully remote

Quick Answer

Mortgage interest on rental property is deductible on Schedule E Line 12, but unlike your primary home, there is no $750,000 debt cap. The key rule for rentals is the Tracing Rule: deductibility follows how the borrowed money was used, not which property secures the loan. A HELOC on your home used to buy a rental generates deductible Schedule E interest. A cash-out refi on your rental used to buy a vacation does not.

Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated June 10, 2026. Taxstra is a CPA firm for high income earners, business owners and real estate investors, serving 1,000+ clients in all 50 states.

The Tracing Rule

The IRS ignores which property secures the loan. They follow the cash.

Mortgage interest is the lifeblood of real estate investing leverage. For most landlords, Line 12 completely offsets rental income, often resulting in a "paper loss" that shelters cash flow from taxes. However, the rules for rental interest differ significantly from personal home interest, and the Tracing Rule under Temp. Reg. § 1.163-8T is what trips investors up most often. For a complete deep-dive on deducting HELOC interest on a rental property, see our full HELOC guide.

Key Insight

The IRS generally ignores which property secures the loan. Instead, they look at how the proceeds were used. Interest deductibility follows the cash.

ScenarioHELOC on personal home → funds used to buy rental

Tax TreatmentDeductible on Schedule E (rental)

Reason✅ Follows the cash to rental

ScenarioCash-out refi on rental → funds used to buy a boat

Tax TreatmentNOT deductible (personal use)

Reason❌ Cash went to personal asset

ScenarioPurchase mortgage on rental property

Tax TreatmentDeductible on Schedule E

Reason✅ Straightforward

ScenarioHELOC partially for rental, partially personal

Tax TreatmentOnly rental portion deductible

Reason⚠️ Must allocate by use of funds

Scenario	Tax Treatment	Reason
HELOC on personal home → funds used to buy rental	Deductible on Schedule E (rental)	✅ Follows the cash to rental
Cash-out refi on rental → funds used to buy a boat	NOT deductible (personal use)	❌ Cash went to personal asset
Purchase mortgage on rental property	Deductible on Schedule E	✅ Straightforward
HELOC partially for rental, partially personal	Only rental portion deductible	⚠️ Must allocate by use of funds

Points & Amortization

"Points" (loan origination fees) are considered Prepaid Interest. Unlike a primary residence where you might deduct points immediately, rental points must generally be amortized over the life of the loan.

How to Calculate Annual Amortization

Points Paid:$3,000

Loan Term:30 years

Annual Deduction (Line 19. Other):$100/year

Watch Out

The Refinance Trap: If you refinance a 30-year loan after only 5 years, you can deduct the remaining unamortized points from Loan #1 in full in the year of refinance. This is a commonly missed "hidden" deduction, worth hundreds of dollars in many cases.

“I recently had the pleasure of working with Taxstra, and I must say, the experience exceeded my expectations. From start to finish, their professionalism, expertise, and customer care were outstanding.”

Google Reviewer · Read on Google

Published client feedback. Individual experiences vary.

Don't Deduct Principal!

A very common mistake among new landlords is deducting the entire mortgage payment. Only the interest portion of each payment is deductible. Principal payments reduce your loan balance, they are not an expense. Your lender's amortization schedule shows the split for each payment.

Monthly Payment Breakdown, $2,000/month Example

Interest Portion:$1,500 → Line 12 (Deductible ✅)

Principal Portion:$300 → NOT Deductible ❌

Escrow (Tax/Insurance):$200 → Lines 9 & 16 (Deductible ✅)

Audit Defense Checklist

Form 1098 is the starting point, not the ending point.

Form 1098

The bank sends this if you paid more than $600 in interest. Match Line 12 strictly to this form IF the loan is solely for the rental.

Closing Disclosure (CD)

Critical for the first year of a purchase or refinance. Proves Points, Prepaid Interest, and the exact loan amount.

Improvement Ledgers (Tracing)

If you used a HELOC, keep a spreadsheet showing exactly which receipts were paid with those specific loan funds.

Sources & Citations

• IRS Publication 936 (Home Mortgage Interest Deduction)
• Temp. Reg. § 1.163-8T (Tracing Rules)
• IRS Publication 527 (Residential Rental Property)

Frequently Asked Questions

Can I deduct interest if I used a credit card to buy repairs?

Yes! Interest on credit cards used exclusively for rental activities is 100% deductible. However, if you mix personal and business charges on the same card, the IRS may disallow the entire interest deduction due to 'commingling' rules. Always use a dedicated card.

What if I refinanced my personal home to buy a rental?

This is where 'Tracing Rules' save you. Even though the loan is secured by your personal home, if you can trace the use of funds to the purchase of the rental property, the interest on that portion of the debt is deductible on Schedule E (not Schedule A).

Are 'Points' deductible in the year paid?

Almost never for rentals. Points paid to purchase or refinance a rental property are considered 'Prepaid Interest' and must be amortized (spread out) over the life of the loan (e.g., divide by 30 years). If you sell the property early, you can deduct the remaining unamortized points in that year.

Is Mortgage Insurance (PMI) deductible?

It depends on the tax year. Congress frequently lets this deduction expire and then renews it retroactively. For 2024, check the latest IRS instructions for Line 9 (Insurance) or Line 19 (Other), as PMI is often not treated strictly as 'Interest'.

What about interest on a construction loan?

Interest paid during the construction period is generally not deductible immediately. It must be 'capitalized' (added to the basis of the building) and then depreciated over 27.5 years once the property is placed in service. Post-construction interest is fully deductible.

My bank didn't send a 1098. Can I still deduct interest?

Yes. Banks only send Form 1098 if you paid more than $600 in interest. Even if you don't get a form (e.g., private lender, seller financing), you can deduct the interest provided you list the recipient's Name, Address, and SSN/EIN on your tax return.

Can I deduct interest paid to a family member?

Yes, IF it is a bona fide loan with a written promissory note and a market interest rate. You must issue them a Form 1098 (or list their specific info on Schedule E), and they must report it as taxable interest income.

Next Steps

Filing it yourself is fine. Optimizing it is where the money is.

Getting the form right keeps you out of trouble. The strategies below are what actually lower the bill.

HELOC on an Investment Property

Deducting HELOC interest on a rental comes down to the tracing rules. The full guide on getting every dollar of HELOC interest where it belongs.

Cost Segregation Study

Interest shelters some rental income, accelerated depreciation can wipe out far more. How a cost seg study front-loads 27.5 years of deductions.

Leveraged portfolio? The interest deduction is only the start.

Book your free 30-minute tax fit call with our team. Tell us what you need, learn how Taxstra can help, and explore whether our services are a good fit. Tax advice, document reviews, and analysis require a paid engagement.

Tax planning slots are limited before year-end.

HELOC or Complex Financing Structure?

Taxstra CPAs untangle tracing rules for HELOCs, cash-out refis, and private loans, ensuring every dollar of interest that should be deductible actually is. Book a free 30-min call.