At 42, every extra dollar has to compete for a job. Paying off $30,000 in student loans may feel like the obvious choice. But putting that money toward debt instead of retirement could reduce your long-term savings. The decision often comes down to one number that many borrowers overlook.
Why the Wrong Choice Can Cost You
When you are in your early forties, time still matters. You likely have around 23 years until traditional retirement age, and possibly longer if you plan to work past 65. The money you contribute to a 401(k) today can compound for another 20 years or more before retirement. Put that same money toward student loans instead, and you reduce your debt faster, but you also give up years of potential investment growth.
That doesn’t mean retirement always comes first. Every extra dollar can only go in one direction, so choosing the wrong priority can leave you with less wealth over time. The decision usually isn’t about whether debt is good or bad. It’s about comparing what each dollar is likely to earn or save.
A financial advisor can help you decide whether your next dollar should go to student loan payments or retirement savings.
The One Number That Decides It
For many borrowers, the decision comes down to a simple comparison: your student loan interest rate versus the return you could reasonably expect from investing that same money.
Federal Direct Loans first taken out between July 1, 2026, and June 30, 2027, carry a fixed rate of 6.52% for undergraduate students, while Direct Unsubsidized Loans for graduate and professional students carry a fixed rate of 8.07%. 1
Here’s what that actually means for $30,000 in student loans: On a standard 10-year repayment plan at 6.52%, your monthly payment works out to about $341 (using the standard loan formula: $30,000 × [monthly rate ÷ (1 − (1 + monthly rate)^-120)], where the monthly rate is 6.52% ÷ 12). Over 120 months, that’s roughly $40,914 in total payments (monthly payment × 120), or about $10,914 in interest (total payments − $30,000 principal).
Put that same $30,000 into a 401(k) instead, assuming an average annual return of 10%, and by age 65, 23 years from now, it could grow to roughly $268,600 (using compound growth: $30,000 × 1.10^23), before factoring in any additional contributions made along the way.
Those rates change the math. A loan at 6.52% interest leaves more room for investing to come out ahead over time if your portfolio earns a higher average return. The S&P 500 has historically averaged about 10% annually since its 1957 launch, including an average annual return of 11.5% over the 40 years ending in December 2025. 2
At a higher rate, like the 8.07% carried by graduate and professional students, it may be harder for investments to beat. So paying down the loan may make more sense once your rate climbs this high.
One other number can matter even more: Your employer’s 401(k) match. Contributing enough to earn the full employer contribution often provides an immediate return that is difficult to beat by making extra payments on a lower-interest student loan.
When Paying Off Loans First Can Make Sense
Interest rates are only one part of the decision. High monthly student loan payments can strain your cash flow, increase your debt-to-income ratio and make it more difficult to qualify for a mortgage or other financing. In those situations, reducing your loan balance may take priority even if the math favors investing.
If you’re 42 and carrying $30,000 in student loans, the answer often begins with your employer’s 401(k) match. From there, a lower interest rate, like 6.52%, generally favors retirement contributions, while a higher one, such as 8.07%, typically points toward paying down the loan first. Cash flow, debt-to-income ratio and other financial goals also factor into the decision.
A financial advisor can help you decide whether to invest or pay down student loans first. Connect with an advisor today!
Photo credit: ©iStock.com/Organic Media, ©iStock.com/Ridofranz.
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