Borrowing from your retirement plan is a common way to access quick cash, but the tax implications are often misunderstood. For the 2026 tax year, here is what you need to know about interest deductibility and the "paying yourself back" myth.

Why Isn't 401(k) Interest Deductible?

The IRS strictly limits interest deductions on loans secured by "elective deferrals" (the pre-tax money you contribute from your paycheck). Since nearly every 401(k) balance is built on these salary-reduction contributions, the interest paid on a loan from these plans is almost never deductible on your tax return.

The "Paying Yourself Back" Trap

While it is true that you are paying interest back into your own account rather than to a bank, there is a hidden cost: Double Taxation.

• You pay the loan interest back using after-tax dollars (money that has already been taxed in your paycheck).
• When you eventually withdraw that same money during retirement, the IRS taxes it again as ordinary income.

401(k) Loan vs. Home Equity Loan 

In previous years, home equity loans were often seen as superior because the interest was deductible. However, under current 2026 tax laws, home equity interest is only deductible if:

1. The funds are used to buy, build, or substantially improve the home that secures the loan.
2. You itemize your deductions instead of taking the standard deduction.