Principal-only payment: how to make sure extra money counts
A principal-only payment is extra money you send with the instruction that it reduce your loan balance instead of being applied to fees, interest or future payments. Extra money does not automatically go to principal: ask your servicer how to designate it, give the instruction with each payment, and confirm it on your next statement. On a $300,000 mortgage, an extra $100 designated to principal in the first month raises that month’s principal reduction from $271.20 to $371.20.
Why the instruction matters
The Consumer Financial Protection Bureau (CFPB) explains that, on a loan payment, the money is generally applied to any fees due first, then to interest, and only what remains reduces principal. It says you may be able to request that your lender or servicer apply more of your payment to principal, and it advises checking your loan documents and reviewing your monthly statement to confirm how the payment was applied. It does not say that extra money goes to principal on its own.
The reason to care is that interest is charged on the remaining balance. Money that reduces the balance now stops generating interest for the rest of the loan. Here is how the first payment splits on three loans, and what the same extra $100, designated to principal, does in that first month:
| Loan | Scheduled payment | First-month interest | First-month principal | With +$100 to principal |
|---|---|---|---|---|
| Mortgage, $300,000 at 6.5%, 30 years | $1,896.20 | $1,625.00 | $271.20 | $371.20 (+36.9%) |
| Car loan, $28,000 at 7.5%, 5 years | $561.06 | $175.00 | $386.06 | $486.06 (+25.9%) |
| Personal loan, $15,000 at 11%, 5 years | $326.14 | $137.50 | $188.64 | $288.64 (+53.0%) |
Fixed rates, new loans, first scheduled payment. Method: How the calculator works.
What it is worth when the extra money does reach principal
If $100 a month is applied to principal from the first payment, the same three loans change like this:
| Loan | Interest saved | Time saved |
|---|---|---|
| Mortgage, $300,000 at 6.5% | $60,995 | 4 yr |
| Car loan, $28,000 at 7.5% | $1,036 | 10 mo |
| Personal loan, $15,000 at 11% | $1,374 | 1 yr 5 mo |
+$100 a month applied to principal from the first payment, loan terms as in the table above.
Timing counts too. As an illustration, on the $300,000 mortgage an extra $200 applied to principal every month saves about $103,449. If the same $2,400 a year reached principal only once each December instead, it would save about $99,670, which is $3,778 less. This is not a prediction of what any servicer does; it shows what is at stake when extra money is delayed.
How to make sure it counts: five steps
- Read your loan documents. They set the terms for prepayments and any penalty.
- Ask your servicer how to designate extra principal. Ask whether it can be done online, by phone, or with a note on a check, and whether you can set a standing instruction for recurring extra payments.
- Give the instruction with every extra payment, not just the first, unless the servicer confirms in writing that a standing instruction is in place.
- Check your next statement. You are looking for the balance to fall by the regular principal plus the extra amount.
- If it was applied elsewhere, contact the servicer and ask for a correction in writing. Keep your payment confirmations.
What to look for on a mortgage statement
For mortgages covered by the federal periodic statement rule (12 CFR 1026.41), the statement must show, grouped together on the first page, the total payments received since the last statement and how they were applied: to principal, interest and escrow, and to fees and charges. It must also show any amount sent to a suspense or unapplied funds account. If your extra money appears there, or in the wrong line, it has not reduced your principal. The rule has exemptions, so check whether your loan is covered; if it is not, or if you have another type of loan, ask your lender how it shows where each payment went.
Questions to ask your servicer
- How do I designate an extra payment as principal-only: online, by phone or on a check?
- Can I set a standing instruction so every extra payment goes to principal?
- Does an extra payment affect my due date, or only my balance?
- Is there a prepayment penalty on my loan, and when does it end?
- Is there a fee or a minimum for extra payments?
Frequently asked questions
What is a principal-only payment?
Does extra money automatically go to principal?
How do I know my extra payment was applied to principal?
Can a principal-only payment trigger a prepayment penalty?
Related guides
- Prepayment penalty: what it is and how to check yours
- How to pay off a car loan faster: 6 ways, with real numbers
- What happens if you pay an extra $200 a month on a 30-year mortgage?
- Biweekly vs monthly mortgage payments: what you really save
See what your extra payment is worth. Enter your loan and test an extra amount to see the interest you would save once it reaches principal.
Open the calculatorSources and method
- Consumer Financial Protection Bureau, Is it better to pay off the interest or principal on my auto loan? (reviewed January 30, 2024).
- Consumer Financial Protection Bureau, What is a prepayment penalty? (reviewed September 11, 2024).
- Consumer Financial Protection Bureau, 12 CFR § 1026.41, Periodic statements for residential mortgage loans, paragraph (d)(3), Past payment breakdown.
- Figures in the tables were calculated with the Financial Accelerator engine (see methodology).
This page is educational, covers U.S. rules, and is not legal or financial advice. How extra payments are applied depends on your loan contract and servicer; confirm it with your own lender.