What one extra payment a year does to a loan

Why one payment a year still matters

An installment loan's payment is fixed, split between interest and principal in an amount that changes slightly each month as the balance shrinks. An extra payment goes entirely to principal, since the regular payment schedule already covers the interest due. That means one extra payment removes more from the balance than a regular payment does, and it keeps reducing the interest charged in every month afterward.

Where to find the money for one extra payment

Because it only has to happen once a year, this doesn't require a permanent change to your monthly budget. A tax refund, a work bonus, or a slower spending month can all cover it without needing twelve months of discipline the way a monthly extra payment would.

Making sure the payment actually reduces principal

This is the step people skip, and it's the one that determines whether the extra payment does anything. Some servicers apply an unlabeled extra payment toward your next month's due date instead of the principal, which defeats the purpose entirely.

1. Call your loan servicer or check your account portal for how to designate an extra payment as principal-only.
2. Make the extra payment separately from your regular monthly payment, not combined into one larger transfer.
3. Label or flag it as a principal-only payment if the platform gives you that option.
4. Check your next statement to confirm the balance dropped by the full extra amount, not just by your regular scheduled payment.
5. Repeat the same process each year, ideally around the same time so it becomes a habit tied to a specific event like a refund or bonus.

What this looks like over the life of a loan

The effect is largest the earlier in the loan it happens, since an extra payment made in year one avoids interest for the whole remaining term, while the same payment made near the end only avoids interest for a few months. If you can choose when to make it, earlier is better, though later is still worth doing.

Common questions

Is one extra payment a year better than a smaller extra amount every month?

Both reduce principal and both help. A monthly extra amount tends to save more overall because it starts working immediately rather than once a year, but an annual payment is easier for people whose extra money shows up in a single lump rather than spread evenly.

Do all loans accept extra payments without a penalty?

Most personal and auto loans do, but some loans include prepayment penalties or restrictions. Check your loan agreement or ask your servicer directly before assuming an extra payment carries no cost.

Should I make the extra payment right when I get my refund or spread it out?

Making it as a lump sum as soon as the money is available maximizes the interest savings, since the balance starts shrinking sooner. Spreading the same amount out over several months still helps, just slightly less, because the principal reduction happens later.