Why is most of my mortgage payment interest?

Q: Why does my payment stay the same if the interest keeps falling?

A repayment mortgage uses one fixed payment that clears the loan by the end of the term. As interest shrinks, principal grows by the same amount. Escrow for tax or insurance is separate and can change on its own.

Q: When does more of my payment go to principal than interest?

It depends on rate and term. On $200,000 over 30 years: month 84 at 3%, month 223 at 6%, month 257 at 8%. Over 15 years at 6%: month 43.

Q: Does refinancing reset the interest back to the start?

The interest-heavy early split restarts on the new loan because a new schedule is calculated on the refinanced balance. The total effect depends on the new rate, term and costs, so compare both schedules.

Nobody front-loaded anything. Interest is charged on what you still owe, and at the start you owe almost all of it.

6 minute read

Why is most of my mortgage payment interest? Because interest is charged on the balance you still owe, and at the start that balance is as large as it will ever be. Nothing is being loaded onto the early years on purpose; the split falls straight out of the arithmetic. Put your own loan into the loan repayment calculator to see your year-by-year schedule. This page walks through why it looks the way it does.

Why is my first mortgage payment mostly interest?

Take a $200,000 mortgage over 30 years at 6%. Lenders quote that as a yearly rate and charge a twelfth of it each month, so the monthly rate is 0.5%. The fixed payment that clears the loan in exactly 360 months works out at $1,199.10.

In the first month, the lender charges 0.5% on the full $200,000:

Interest: $200,000 × 0.5% = $1,000.00
What is left of the payment to reduce the debt: $1,199.10 − $1,000.00 = $199.10

So about 83 cents of the first dollar goes to interest. That is not a fee or a penalty. It is simply one month's interest on $200,000, and it would be the same $1,000 on a loan of any length at that rate.

The Consumer Financial Protection Bureau describes the same pattern: early on, most of each payment covers interest, and by the end most of it pays off the last of the principal. The name for this is amortisation.

How the split shifts, month by month

Next month the balance is $199,800.90, so the interest is a little smaller — and because the payment is fixed, the principal share is a little larger. That repeats every month. Each dollar of principal repaid lowers the next month's interest, which frees up a slightly bigger slice for principal. It is compounding working in your favour, just slowly at first.

On the same $200,000 loan at 6%, the engine produces:

After year 1: $14,389.20 paid, of which $11,933.19 was interest. The balance is down only $2,456.02, to $197,543.98.
After year 5: $58,054.78 of interest paid, and $186,108.71 still owed.
After year 10: $111,263.58 of interest paid, and $167,371.45 still owed.
The last payment: $5.97 of interest and $1,193.14 of principal — the mirror image of the first.

When does principal overtake interest?

On this loan, not until month 223 — the seventh month of year 19. In month 222 the payment splits $599.62 interest to $599.48 principal. In month 223 it is $596.63 to $602.48, and principal stays ahead from then on.

Half the original $200,000 is not repaid until month 252, the end of year 21. Two-thirds of the way through the term, you have cleared half the debt. That is the part most people find surprising, and it is the same effect seen from the other side.

Why am I paying so much interest on my mortgage?

Two things set the size of the interest share: the rate, and the length of the loan. Here is the same $200,000 run four ways:

3% over 30 years: $843.21 a month, $500.00 of the first payment is interest. Principal overtakes interest in month 84, the end of year 7. Total interest: $103,554.90.
6% over 30 years: $1,199.10 a month, $1,000.00 of the first payment is interest. Crossover in month 223. Total interest: $231,676.38.
8% over 30 years: $1,467.53 a month, $1,333.33 of the first payment is interest. Crossover in month 257, in year 22. Total interest: $328,310.49.
6% over 15 years: $1,687.71 a month. The first month's interest is still $1,000.00, but $687.71 goes to principal. Crossover in month 43, in year 4. Total interest: $103,788.46.

The rate decides how much interest one month costs. The term decides how much is left over for principal once that interest is paid. A higher rate or a longer term both push the crossover later, and the total up. These rates are illustrations to show the shape, not a statement about what any lender is charging.

What an extra payment does to the split

A regular payment has to cover the month's interest first. Money paid on top of it, where your lender allows that and applies it to the balance, goes entirely to principal. Every dollar of principal repaid early stops being charged interest for the rest of the loan, which is why an extra payment in year 2 moves the total more than the same payment in year 25. Whether that is a good use of the money depends on what else it could do, and that is your call, not a sum. The mortgage overpayment calculator shows the time and interest it would save on your own loan.

Common questions

Is my lender charging me extra interest at the start?

No. Each month's interest is the monthly rate times the balance you owe that month. The early payments are mostly interest only because the balance is highest then. On a $200,000 loan at 6%, the first month's interest is exactly 0.5% of $200,000: $1,000.

Why does my payment stay the same if the interest keeps falling?

Because a standard repayment mortgage is built around one fixed payment that clears the loan by the end of the term. As the interest part shrinks, the principal part grows by the same amount, so the total does not change. Anything else in the payment, such as escrow for property tax or insurance, is separate and can move on its own.

When does more of my payment go to principal than interest?

It depends on the rate and the term. On $200,000 over 30 years it happens in month 84 at 3%, month 223 at 6% and month 257 at 8%. Over 15 years at 6% it happens in month 43. The loan repayment calculator shows the yearly split for your own loan.

Does refinancing reset the interest back to the start?

The split restarts on the new loan, because a new schedule is calculated on the balance you refinance. How much interest that means in total depends on the new rate, the new term and any costs of the switch, so the only honest answer is to run both schedules and compare them.

Is this the same for car loans and personal loans?

Yes, for any loan repaid in equal instalments with interest charged on the remaining balance. The shorter the term, the less pronounced the pattern, because more of each payment has to go to principal from the start.

Not financial advice. Worked examples assume a fixed rate, a quoted annual rate divided by twelve, and no fees or escrow. Rates on this page are illustrations, not quotes. Your own schedule is on your loan statement or from your lender.