HELOC Interest Deduction: What Records Should You Keep?

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This guide is general information, not tax advice. Tax rules change — consult a qualified tax professional about your situation.

The short answer

HELOC interest is deductible only if the borrowed funds were used to buy, build, or substantially improve the home that secures the loan — that's the post-2017 rule, made permanent under current IRS guidance. If you used HELOC money for credit card payoff, a vacation, tuition, or anything personal, none of the interest is deductible. Because the IRS decides based on how you used the money, not what the loan is called, your records are the entire claim. Keep a paper trail from each draw to each project: the loan agreement, draw statements, contractor invoices, receipts, permits, before/after photos, and bank statements showing the money's path.

The rule in plain English

Since the 2017 tax changes, "home equity indebtedness" is deductible only when it qualifies as acquisition debt — debt used to buy, build, or substantially improve the qualified residence. Two more conditions sit on top of that:

1. The debt limit. Total acquisition debt across all loans secured by the home (first mortgage + HELOC) is limited to $750,000 ($375,000 if married filing separately) for debt taken on after December 15, 2017.
2. You must itemize. The deduction only helps if you itemize on Schedule A. If the standard deduction is better for you, the HELOC interest gives you no federal tax benefit.

Substantial improvement means work that adds value, prolongs the home's useful life, or adapts it to a new use — room additions, remodels, new systems. Routine repairs don't count.

The record checklist

If you deduct HELOC interest, build a file (physical or digital) that lets a tax professional — or an IRS reviewer — follow every dollar from draw to project:

1. The HELOC agreement and disclosures. Proves the loan exists and is secured by the home.
2. Draw records and statements. Date and amount of every draw you took.
3. A dedicated trail from draw to expense. The single most valuable habit: route HELOC draws through a separate account (or at least keep dated bank statements) so each draw maps to specific project payments. Commingled funds are where claims die.
4. Contractor invoices and receipts. Itemized, dated, and tied to the property address.
5. Permits and inspection records. Municipal permits are strong third-party evidence the work happened.
6. Before/after photos with dates. Cheap to keep, powerful evidence.
7. Cancelled checks / transfer confirmations. Proof the money left your account and went to the project.
8. Form 1098. Your lender reports mortgage interest paid in Box 1 — but note that Form 1098 doesn't tell the IRS how you used the money. The use is your documentation job.
9. Contractor W-9s / license info. If you paid individuals, keep their identifying details.
10. Project dates and completion records. Tie the work to the tax year you're claiming.

Mixed-use draws: the hard case

Many borrowers draw for several purposes at once — part remodel, part debt payoff. Under current guidance, only the interest allocable to the qualifying portion is deductible, and you need records precise enough to split it. Practical approach:

• Separate draws for separate purposes. Take one draw for the remodel and another for the personal expense. Don't mix them in one draw if you can avoid it.
• Document the split contemporaneously. A note made at the time ("$25,000 draw on 3/15 → $20,000 to ABC Contractors for kitchen, $5,000 to credit card payoff") beats a reconstruction from memory two years later.
• Apply the debt limit to the qualifying portion. Only the qualifying balance counts against the $750,000 cap.

Common mistakes

1. Assuming HELOC interest is automatically deductible. The pre-2018 rule (deduct regardless of use, up to old limits) is gone. Use is everything.
2. Commingling draws with personal spending. Once HELOC money mixes with general funds, tracing becomes nearly impossible — and the burden of proof is on you.
3. Deducting improvements to a different property. A HELOC on your primary home used to renovate a rental or a relative's house doesn't qualify under the residential acquisition-debt rules.
4. Counting repairs as improvements. New water heater to replace a broken one? That's a repair. Upgrading to a higher-efficiency system as part of a remodel? That starts looking like an improvement — document the difference.
5. Taking the standard deduction anyway. If your itemized deductions don't exceed the standard deduction, the HELOC records are still worth keeping — but they won't lower this year's tax bill.
6. Losing records after the project. Keep the file for as long as you claim the deduction plus the statute-of-limitations window — and longer, since the improvement also adjusts your home's cost basis for a future sale.

Methodology and limitations

Rules reflect IRS Publication 936 and related IRS guidance as of October 2026. The "substantial improvement" standard and the buy/build/improve use test involve facts-and-circumstances judgment the IRS has not reduced to a checklist — when a project is borderline (repair vs. improvement), a tax professional's judgment call matters. Interest-allocation rules for mixed-use debt have additional technical requirements not fully covered here.

Reviewed by the LoanMate.ai editorial team.

Primary sources

• IRS Publication 936, Home Mortgage Interest Deduction (irs.gov)
• IRS Topic 504, Home Mortgage Points (irs.gov)
• IRS Publication 530, Tax Information for Homeowners (irs.gov)

Next action

Shopping for a HELOC? Compare lenders and run the payment math →. Shop lenders here → — and set up a separate draw account on day one so your tax records are clean from the start.