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Tax deductions, credits, and amortization

How does the use of a loan management account to buy a second home affect eligibility for the mortgage interest itemized deduction?

Last updated: 
Sep 2025
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Answer

The use of a loan management account (LMA) to buy a second home can affect eligibility for the mortgage interest itemized deduction, but the key legal considerations are not the specific type of account used to borrow the funds, but rather how the loan proceeds are used, whether the debt is secured by the home, and whether the other requirements for deductible home mortgage interest are satisfied.

Here is a detailed analysis based on the relevant legal authorities:

1. Secured Debt Requirement

To be deductible as home mortgage interest, the interest must be paid on a loan that is secured by the qualified residence (main home or second home) of the taxpayer. The Internal Revenue Code provides:

  • "Qualified residence interest" means any interest paid or accrued during the taxable year on acquisition indebtedness or home equity indebtedness with respect to any qualified residence of the taxpayer.
  • "Acquisition indebtedness" is any indebtedness incurred in acquiring, constructing, or substantially improving any qualified residence of the taxpayer and secured by such residence.

If the LMA is not secured by the second home (for example, if it is a securities-backed line of credit or an unsecured loan), then the interest paid on that loan is not deductible as home mortgage interest, even if the proceeds are used to buy a second home. The IRS and courts have consistently held that the debt must be secured by the home to qualify.

2. Use of Proceeds

Even if the LMA is secured by the second home, the proceeds must be used to buy, build, or substantially improve the home to qualify as "acquisition indebtedness." If the proceeds are used for other purposes, the interest is not deductible as home mortgage interest.

3. Debt Limits

There are limits on the amount of acquisition indebtedness for which interest is deductible. For debt incurred after December 15, 2017, and before January 1, 2026, the limit is $750,000 ($375,000 if married filing separately). For debt incurred on or before December 15, 2017, the limit is $1,000,000 ($500,000 if married filing separately).

If the total mortgage debt (including the LMA if it is secured by the home) exceeds these limits, only a proportional amount of the interest is deductible. The deductible portion is determined by multiplying the total interest paid by a fraction: the numerator is the applicable debt limit, and the denominator is the average balance of the total mortgage debt.

4. Loan Management Account as a "Mortgage"

The IRS and courts look to the substance of the transaction, not the label. If the LMA is secured by the second home and meets the requirements of acquisition indebtedness, it is treated as a mortgage for tax purposes, and the interest may be deductible.

5. Tracing Rules for Unsecured Loans

If the LMA is not secured by the home, the interest is not deductible as home mortgage interest, but may be deductible as investment interest or business interest if the proceeds are used for those purposes, subject to the applicable limitations and tracing rules.

6. Reporting and Documentation

To claim the deduction, the taxpayer must be able to show that the loan is secured by the home, that the proceeds were used to acquire, build, or substantially improve the home, and that the debt does not exceed the applicable limits. Proper documentation, such as a recorded mortgage or deed of trust, is essential.

Summary: If a loan management account is used to buy a second home, the interest is deductible as home mortgage interest only if the loan is secured by the second home and the proceeds are used to acquire, build, or substantially improve the home, subject to the applicable debt limits. If the LMA is not secured by the home, the interest is not deductible as home mortgage interest, regardless of how the proceeds are used.

If you have a specific scenario (e.g., whether the LMA is secured by the home or by other assets), please provide more details for a more tailored analysis.

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