Would you give up the capital gains rate on part of a gain to deduct your interest this year?

Would you give up the capital gains rate on part of a gain to deduct your interest this year?

Sometimes that is exactly the trade to make. We had a client with a multimillion-dollar investment interest carryover that was going nowhere. We made the election, the return showed the difference in tax, and more than a million dollars of that carryover turned into cash, basically that day. The trade was simple. We changed the rate on part of his gain to ordinary, took the deduction, and reduced the carryover.

What is the limit?

An individual deducts investment interest only to the extent of net investment income. Interest the limit disallows carries forward and faces the same limit next year, and the year after that, until there is income to absorb it.

Net investment income is investment income reduced by the investment expenses other than interest. Taxable interest and ordinary dividends count. Net capital gain on investment property and qualified dividends generally do not, because the Code taxes them at the preferential rate and will not let you have it both ways.

What does the election do?

The election lets you treat all or part of that gain, or those qualified dividends, as investment income. The elected amount increases investment income for the interest limitation, and the same amount loses its preferential rate. Without the election, the gain keeps its rate and the disallowed interest carries forward. With the election, more interest is deductible this year, and the elected gain is taxed as ordinary income.

When is the trade worth making?

The trade is worth making when the carryforward would otherwise sit unused. A taxpayer with a carryforward that keeps growing and little ordinary investment income to absorb it gains more from the deduction now than the rate costs. A taxpayer who expects ordinary investment income next year is usually better off waiting, because the carryforward is worth more against income taxed at 37% than against a gain that would have been taxed at 20%.

We run five numbers before we elect anything. How much interest is actually limited this year, how much additional investment income releases it, the rate cost on that amount, the likelihood of using the carryforward against future investment income, and the time value of money between now and then.

Elect only what you need. Electing more than the amount that releases the interest surrenders the preferential rate and produces no additional deduction.

How is the election made?

The election is made on Form 4952, generally by the due date of the return including extensions, and revocation requires IRS consent. The allowed interest is an itemized deduction, and beginning in 2026 a top-bracket taxpayer loses a slice of every itemized deduction, so the final calculation uses the deduction that actually reduces this taxpayer's tax, not the deduction on paper.