How to Read a Mortgage Amortization Schedule

What Is an Amortization Schedule?

An amortization schedule is a complete table of every payment you'll make over the life of your mortgage. Each row shows exactly how much of that payment goes to interest, how much reduces your principal balance, and what your remaining balance is after the payment.

Most people never look at their amortization schedule — and that's a costly mistake. Understanding it reveals one of the most important and counterintuitive facts about mortgages: in the early years, the vast majority of your payment goes to your lender as interest, not toward owning more of your home.

What Each Column Means

YEAR The payment period

Amortization schedules are often shown annually (each row = 1 year of payments) though they can also be shown monthly. Our calculator shows annual rows, which makes it easier to see the big picture over your full loan term.

PAYMENT Your annual total paid

This is simply your regular monthly payment multiplied by 12. For a fixed-rate mortgage, this number stays the same every year for the entire term — only the split between principal and interest changes.

PRINCIPAL How much goes toward your home

This is the portion of your annual payments that actually reduces your loan balance. In year 1, this is surprisingly small. In year 25, it's almost everything.

INTEREST What you pay your lender

The interest charged is calculated on your remaining balance each month. As your balance decreases, the interest charged each month also decreases — which is why the principal portion grows over time.

BALANCE What you still owe

Your remaining mortgage balance after all payments in that year. This number tells you your home equity position (assuming your home's value stays constant) and what you'd need to pay to discharge the mortgage.

A Real Example

Here's what the first 5 years of a $520,000 mortgage at 6.25% over 25 years looks like:

The Front-Loading Problem

The schedule above illustrates mortgage front-loading: interest is calculated on your outstanding balance each month. Since your balance is highest at the start of the mortgage, that's also when you pay the most interest.

After 5 full years of payments ($217,140 paid), your balance has only dropped from $520,000 to $458,516 — a reduction of just $61,484. You've paid $155,656 in interest during that time.

This isn't your bank being unfair — it's simply how compound interest works. But it does mean that extra payments made early in your mortgage term are exceptionally powerful, because they reduce the balance at the point where interest charges are highest.

How Extra Payments Change Your Schedule

Adding even $300/month to the example above would:

• Reduce the total interest paid from ~$490,000 to ~$390,000 (saving $100,000)
• Pay off the mortgage approximately 5 years and 4 months early
• Shift the principal/interest ratio in your favour much sooner

The amortization schedule recalculates completely — each extra payment shrinks the balance, which reduces next month's interest, which means more of the regular payment goes to principal, which shrinks the balance faster. It compounds in your favour.

How to Use Your Schedule Strategically

Once you understand your amortization schedule, you can use it to make smarter decisions:

• Find your crossover point — the year when your principal payment exceeds your interest payment. For most 25-year mortgages at today's rates, this happens around year 14–16.
• Plan lump-sum payments — the earlier you make them, the more interest you avoid. A $10,000 lump sum in year 1 saves far more than the same payment in year 15.
• Evaluate refinancing — if you're 10 years in and considering a refinance that resets your amortization, your schedule shows exactly how much total interest that adds.
• Track your equity — the balance column shows your loan-to-value at any point in time, which matters for refinancing eligibility and mortgage insurance removal.