Whether interest on a Loan Management Account is tax deductible depends on what you did with the borrowed money, not on the fact that a brokerage portfolio secures the loan. Spend the proceeds on more securities and the interest is generally deductible as investment interest. Spend them on your business and it’s a business expense. Spend them on a vacation or a kitchen remodel and the interest is personal, with no deduction at all.
Why the IRS Follows the Money, Not the Collateral
The temporary Treasury regulations on interest allocation require you to trace each dollar of loan proceeds to the specific expenditure it funds.1GovInfo. 26 CFR 1.163-8T Allocation of Interest Expense Among Expenditures The collateral is irrelevant. A single LMA can generate several categories of interest at once if you split the proceeds among different uses: borrow $100,000 and buy corporate bonds and that slice is investment interest; use another slice to fund a sole proprietorship and that becomes business interest; spend the rest on personal items and that portion is non-deductible.
Commingling is where tracing goes wrong. If you deposit LMA proceeds into a checking account that already holds other funds, the rules treat the borrowed money as spent on the first expenditures out of that account, which may not be the ones you had in mind. The cleanest fix is to route LMA proceeds through a dedicated account and pay for each intended purchase directly from there, leaving a paper trail that connects every borrowed dollar to a specific asset or expense.
When LMA Interest Is Deductible as Investment Interest
Most LMA borrowers use the money to buy more securities, which puts the interest in the investment interest category. Investment interest is deductible, but only up to your net investment income for the year; any excess is disallowed for that year.2Office of the Law Revision Counsel. 26 USC 163 – Interest
Net investment income generally equals your investment income minus your investment expenses other than interest. Investment income includes taxable interest, non-qualified dividends, short-term capital gains, and royalties from investment property.3Internal Revenue Service. Publication 550 – Investment Income and Expenses Under current law, most investment-related expenses beyond interest are no longer separately deductible, so for most taxpayers the figure effectively equals investment income.
Long-term capital gains and qualified dividends are left out of the calculation at first because they already receive preferential tax rates. That exclusion often creates a gap: a portfolio throws off large gains, but little qualifies as net investment income to deduct the LMA interest against.
Electing to Include Capital Gains
You can close the gap by electing to reclassify some or all of your net long-term capital gains and qualified dividends as investment income, which raises the ceiling on how much interest you can deduct this year.2Office of the Law Revision Counsel. 26 USC 163 – Interest Whatever you reclassify loses its preferential rate and is taxed as ordinary income instead.3Internal Revenue Service. Publication 550 – Investment Income and Expenses
Whether the trade works depends on your bracket. Compare the tax you save by deducting more interest against the extra tax you owe by converting capital gains from the preferential rate (typically 15% or 20%) to your ordinary rate, which can run as high as 37%. For taxpayers in lower brackets the math sometimes works. For those already in the top bracket, the deduction rarely outweighs the cost of giving up the capital gains rate. The election is made on Form 4952 and applies only for the year filed.
Carrying Disallowed Interest Forward
Investment interest you can’t deduct this year because of the cap carries forward indefinitely and is treated as investment interest paid in the next tax year, still subject to the same cap.2Office of the Law Revision Counsel. 26 USC 163 – Interest Over time, as you realize more investment income, the deduction catches up. Track the carryforward yourself; the IRS won’t do it for you.
When LMA Interest Is Deductible as Business Interest
LMA interest traced to a trade or business qualifies as a business expense rather than an investment expense. It’s reported on the relevant business schedule, such as Schedule C for sole proprietors, and reduces business income directly.4Internal Revenue Service. Topic No. 505 Interest Expense You don’t need to itemize to claim it, and it isn’t subject to the net investment income cap.
Business interest has its own ceiling, generally the sum of your business interest income plus 30% of adjusted taxable income.2Office of the Law Revision Counsel. 26 USC 163 – Interest Businesses with average annual gross receipts below an inflation-adjusted threshold (roughly $30 million to $32 million in recent years) are exempt. Most individuals borrowing from an LMA to fund a small business fall well under that line.
When LMA Interest Is Not Deductible
Personal Spending
Interest on debt traced to personal spending is flatly non-deductible. The code disallows any deduction for personal interest, defined as interest that doesn’t fall into one of the recognized categories like investment, business, passive activity, qualified mortgage, or student loan interest.2Office of the Law Revision Counsel. 26 USC 163 – Interest LMA proceeds used for a vacation, a personal car, or living expenses produce interest with no tax offset.
Buying Tax-Exempt Securities
Borrow from an LMA to purchase municipal bonds or other tax-exempt obligations and the interest on that portion of the debt is completely non-deductible. The code prohibits deducting interest on debt incurred to purchase or carry securities whose income is already exempt from federal tax.5Office of the Law Revision Counsel. 26 USC 265 – Expenses and Interest Relating to Tax-Exempt Income This catches investors who hold a mix of taxable bonds and munis in the same portfolio and borrow against all of it.
Proceeds Used for Passive Activities
If you use LMA proceeds to fund a passive activity, such as a rental property or a limited partnership in which you don’t materially participate, the resulting interest is neither investment interest nor business interest. It falls into its own bucket governed by the passive activity loss rules, which allow passive losses (including allocable interest) only against passive income.6Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited The investment interest rules explicitly exclude passive activity income and expenses, so you can’t fold passive interest into your Form 4952 calculation.2Office of the Law Revision Counsel. 26 USC 163 – Interest
A limited exception applies to rental real estate. If you actively participate in managing a rental property, up to $25,000 of passive losses (including allocable interest) can offset non-passive income each year, with that allowance phasing out at higher income levels.6Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited Disallowed passive losses carry forward and can be used in future years when you have passive income or when you fully dispose of the activity.
How to Claim the Deduction
If your LMA interest qualifies as investment interest, file Form 4952 to calculate the deductible amount.7Internal Revenue Service. Form 4952 – Investment Interest Expense Deduction The form runs through three parts: your total investment interest expense, your net investment income (including any election to reclassify capital gains), and the resulting deductible amount versus the carryforward. The deductible figure moves to Schedule A, Line 9, as an itemized deduction.
Because it’s an itemized deduction, investment interest only helps you if your total itemized deductions exceed the standard deduction for your filing status.8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 If mortgage interest, state and local taxes, charitable contributions, and investment interest combined don’t clear that threshold, the deduction gives you nothing this year. The unused amount still carries forward.
Your brokerage will report the total LMA or margin interest you paid for the year on your consolidated statement. The harder part is proving how you spent the borrowed money, because in an audit the burden of tracing proceeds to specific expenditures sits entirely on you. Keep records showing the date each disbursement left the LMA, the account it landed in, and the asset or expense it funded. If proceeds touched a commingled account, document the sequence and timing of every withdrawal out of that account. Without a clear trail connecting the borrowed dollars to a qualifying expenditure, the IRS can reclassify the interest as personal and deny the deduction.