The capital gains tax election lets you treat some or all of your long-term capital gains (and qualified dividends) as ordinary investment income so you can deduct more of your investment interest expense in the current year. Normally the investment interest deduction on your federal return is capped at your net investment income, and long-term gains and qualified dividends don’t count toward that cap because they’re taxed at preferential rates.1Office of the Law Revision Counsel. 26 USC 163 – Interest The election, made under ยง163(d)(4)(B), lifts that cap by moving gains into the ordinary-income column. The cost: every dollar you reclassify loses its preferential rate and gets taxed at your higher ordinary rate.
How the Election Works
Interest on money you borrow to buy or carry investment property is deductible, but only up to your net investment income for the year. Net investment income generally includes taxable interest, non-qualified dividends, and certain royalties. Long-term capital gains and qualified dividends sit outside that pool by default.
That leaves investors carrying margin debt or other investment loans in a bind. If your ordinary investment income is small relative to your borrowing costs, a large share of your interest expense becomes non-deductible for the year. The election closes the gap. You can choose to treat part or all of your net capital gain from investment property as investment income, which raises the ceiling on your deduction.1Office of the Law Revision Counsel. 26 USC 163 – Interest Qualified dividends get the same treatment, and each piece is elected separately on Form 4952.2Internal Revenue Service. Form 4952 Investment Interest Expense Deduction
You aren’t forced into all-or-nothing. The statute lets you elect “so much of the net capital gain” as you choose, so you can reclassify just enough to absorb your excess interest and leave the rest taxed at preferential rates.
When the Election Saves You Money
The trade-off is a straight comparison: the tax you save from a bigger interest deduction against the tax you pay by losing the preferential rate on the reclassified gains. For most taxpayers with meaningful disallowed interest, the deduction side wins.
Say you’re in the 24% ordinary bracket and your long-term gains would otherwise be taxed at 15%. Reclassifying $10,000 of gains costs an extra $900 on those gains (the 9-point rate difference). That same $10,000 lets you deduct $10,000 more of investment interest, saving $2,400 at your 24% marginal rate. Net benefit: $1,500. The math works in your favor any time your ordinary rate exceeds the rate spread between ordinary and capital gains.
Where it stops working is at the bottom of the income scale. If your long-term gains would otherwise fall in the 0% capital gains bracket, reclassifying them means paying your ordinary rate on income that would have been tax-free. For someone in the 12% bracket with 0% gains, the extra tax on the gains matches the deduction savings dollar for dollar. It’s a wash at best.
For 2026, the long-term capital gains rate is 0% on taxable income up to $49,450 for single filers ($98,900 for married couples filing jointly), 15% up to $545,500 ($613,700 joint), and 20% above those thresholds. Ordinary rates run from 10% to 37%.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The wider the gap between your ordinary rate and your applicable capital gains rate, the more each reclassified dollar costs, but also the more each dollar of deduction is worth. Unless your gains sit in the 0% bracket, the deduction almost always outweighs the rate sacrifice.
Who Can Make the Election
The election is available to any individual taxpayer (not a corporation) who meets three conditions in the same year.
First, your investment interest expense has to exceed your net investment income. If regular investment income already covers all your interest, there’s nothing to elect.1Office of the Law Revision Counsel. 26 USC 163 – Interest
Second, you need net capital gain from investment property. That means long-term gains from stocks, bonds, land held for appreciation, or similar assets, minus long-term losses and any capital loss carryovers.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses If losses wipe out your gains, the election has nothing to work with.
Third, the debt has to be for investment purposes. Margin loans from a brokerage account are the most common qualifying debt, along with loans to buy non-business investment property. Interest on debt used for a passive activity, a trade or business, personal expenses, or tax-exempt securities does not qualify. One boundary that trips people up: interest on money borrowed to buy tax-exempt securities like municipal bonds is excluded from the investment interest deduction entirely, regardless of this election.5Internal Revenue Service. Publication 550 – Investment Income and Expenses
How to Make the Election on Form 4952
You make the election on Form 4952, Investment Interest Expense Deduction, attached to your Form 1040.6Internal Revenue Service. About Form 4952, Investment Interest Expense Deduction Before you fill it out, gather your total investment interest paid (including any disallowed interest carried forward from last year), your net capital gain from Schedule D, your qualified dividends from the 1040, and any other investment income like taxable interest and non-qualified dividends.
The lines that control the election live in Part II. Line 4b is where qualified dividends go if you’re considering reclassifying them, and Line 4e captures the net capital gain eligible for reclassification. Line 4g is the one you actually choose: the amount from those two lines that you elect to treat as investment income. You don’t have to fill it with the maximum. The rest of the form calculates your allowable deduction and rolls any excess forward.2Internal Revenue Service. Form 4952 Investment Interest Expense Deduction
Carrying Unused Interest Forward
Investment interest you can’t deduct this year isn’t lost. The disallowed portion carries forward indefinitely, with no expiration, and stacks onto next year’s interest when you fill out Form 4952 again.2Internal Revenue Service. Form 4952 Investment Interest Expense Deduction That gives you a yearly choice: reclassify gains now to use up the deduction immediately, or wait and hope a future year produces enough regular investment income to absorb the interest without sacrificing preferential rates.
Carrying forward tends to make sense when your current gains fall in the 0% bracket or when you expect a future year with larger ordinary investment income. Electing now tends to be better when the carryforward balance is large and growing, since the money sitting in that balance doesn’t earn any return while it waits.
AMT and Net Investment Income Tax
If you owe alternative minimum tax, the investment interest deduction gets recalculated separately on a second Form 4952 using AMT-adjusted figures.7Internal Revenue Service. Instructions for Form 6251 Interest on debt used to buy private activity bonds, normally non-deductible because the bond income is tax-exempt, gets folded into the AMT calculation because that income becomes taxable for AMT.8Office of the Law Revision Counsel. 26 U.S. Code 56 – Adjustments in Computing Alternative Minimum Taxable Income There’s a ceiling worth knowing: the amount you elect on Line 4g of the AMT Form 4952 can’t exceed what you elected on your regular-tax Form 4952.
The 3.8% net investment income tax applies to individuals with modified adjusted gross income above $200,000 (single) or $250,000 (married filing jointly), thresholds that aren’t indexed for inflation.9Internal Revenue Service. Questions and Answers on the Net Investment Income Tax Capital gains count as net investment income for NIIT whether or not you elect, so reclassification doesn’t change the income side. It can help on the deduction side: investment interest allocable to investment income can reduce the amount subject to the 3.8% tax, producing a modest additional savings for higher-income filers.
Once You File, You’re Locked In
After you file a return with the election, you can only undo it with IRS permission.10Internal Revenue Service. Election to Treat Qualified Dividend Income as Investment Income That typically requires a private letter ruling, and the cost of obtaining one usually dwarfs the tax difference at stake. Run the numbers before you file, especially if your gains sit near the line between the 0% and 15% capital gains brackets. Keep a copy of the filed Form 4952 and your supporting brokerage statements; if disallowed interest carries forward, you’ll need them to verify the balance in later years.