Borrowers are often surprised by how much of the first year's mortgage payments go to interest. This is a normal feature of amortization, not a lender trick, and understanding it makes extra-payment strategies much more intuitive.
Interest is highest when the balance is highest
At the start of a mortgage, you owe almost the entire original loan amount. Because interest is usually calculated on that remaining balance, the first payments naturally devote more money to interest than to principal.
The pattern changes gradually, not suddenly
There is no single month when the loan flips from interest-heavy to principal-heavy. The shift happens slowly as the balance falls. That is why early payoff progress can feel psychologically slow even when the loan is behaving exactly as designed.
This is also why early extra payments are powerful
When borrowers add extra principal early, they interrupt the high-balance phase sooner. That reduces future interest month after month, which is why even small early overpayments can create meaningful lifetime savings.
Key takeaways
- High early interest is a normal result of a high starting balance.
- The interest-to-principal mix shifts gradually over time.
- Early extra principal payments interrupt the expensive phase sooner.
Reader note
This guide is educational and does not replace lender disclosures, personalized financial advice, tax advice, or legal advice.