Why do I pay mostly interest in the early years of my mortgage?

Interest is charged on the outstanding balance, which is highest early on, so interest dominates the payment for roughly the first half of the term.

When does my mortgage balance start dropping faster?

The crossover point where principal exceeds interest typically happens near the middle of the loan term.

Does this schedule include property tax and insurance?

No, only principal and interest; escrowed taxes and insurance are billed separately.

How much would extra payments change this schedule?

Extra principal payments lower every future month's interest and shorten the schedule.

Can I use this for a refinanced loan?

Yes, enter the new loan amount, rate, and term after refinancing.

MORTGAGE AMORTIZATION CALCULATOR - unitcalculatortool.net

MORTGAGE TOOLS

Mortgage Amortization Calculator

Generate a full year-by-year or month-by-month amortization schedule for a fixed-rate mortgage.

Loan amount

Interest rate (APR)

Loan term

MONTHLY PAYMENT (P&I)

Principal Interest

Loan amount$0

Total interest paid$0

Total of payments$0

Payoff date—

Amortization Schedule

Period	Payment	Principal	Interest	Balance

Disclaimer: This calculator provides estimates for informational and educational purposes only and does not constitute financial advice. It assumes a fixed rate and consistent on-time payments throughout the term. Confirm your exact schedule with your lender or loan servicer.

How to Use the Mortgage Amortization Calculator

Enter your loan amount, interest rate, and loan term to generate a full month-by-month amortization schedule showing how much of each payment goes toward principal versus interest.

How Mortgage Amortization Works

Why Early Payments Are Mostly Interest

On a $300,000 loan at 6.5% over 30 years, month one applies roughly $1,625 to interest and only about $271 to principal. Interest is calculated on your remaining balance, so it’s highest when your balance is highest.

How the Interest-to-Principal Ratio Shifts Over Time

As your balance shrinks, less of each payment covers interest, leaving more to reduce principal — a snowball effect that accelerates near the end of the loan.

Example: Balance Milestones on a $300,000 Loan at 6.5%

After 5 years: ~$282,000 remaining (6% paid off)
After 10 years: ~$256,000 remaining (15% paid off)
After 20 years: ~$158,000 remaining (nearly half paid off)
After 30 years: $0 remaining, with total interest exceeding $382,000

Why Extra Payments Matter More Early in the Loan

Extra principal paid in year one or two prevents years of future interest from ever accruing. The same extra payment in year 25 has a much smaller effect.

Using Amortization to Track PMI Removal

Lenders generally cancel PMI once your balance reaches 78% of the original home value. An amortization table shows exactly which month you’ll cross that threshold.

Using Amortization for Tax Planning

Mortgage interest is often deductible for those who itemize. Your amortization table shows how much interest you paid in a given year before your official Form 1098 arrives.

Frequently Asked Questions

Why does most of my early mortgage payment go toward interest?

Interest is calculated on your outstanding balance, which is highest at the start of the loan, so more of each early payment covers interest.

How can I see how much equity I have at any point in my loan?

Your amortization schedule shows your remaining balance after every payment — subtract that from your home’s current value to estimate equity.

Does refinancing reset my amortization schedule?

Yes. Refinancing creates a new loan with its own schedule, restarting the interest-heavy early period.

When will my PMI automatically be removed?

Generally once your loan balance reaches 78% of the home’s original value.

Can I use an amortization schedule for tax deduction purposes?

Yes, it can help estimate annual deductible mortgage interest, though your lender’s Form 1098 is the official record.

Related Mortgage Calculators

Disclaimer

This calculator provides estimates for educational purposes only and does not constitute financial, tax, or legal advice. Actual schedules may vary by lender.