How to Read an Amortization Schedule (And Why It Matters)

The Most Depressing Document in Finance?

When you close on a house, you get a stack of papers. Buried in there is the Amortization Schedule. Most people glance at it and ignore it.

But if you look closely, it can be shocking. On a new 30-year loan, you might send the bank a check for $2,000, and see your loan balance drop by only $300. Where did the other $1,700 go? Interest.

What is Amortization?

Amortization is the process of spreading out a loan into a series of fixed payments over time. While your total payment stays the same, the composition of that payment changes every single month.

The Formula Logic

Interest is calculated on your current outstanding balance.

Month 1: Your balance is huge (e.g., $400,000). Interest is calculated on $400k. That interest is paid first. The leftovers go to principal.
Month 120 (Year 10): Your balance is lower. Interest is calculated on that lower number. Less interest is owed, so more of your fixed payment goes to principal.
Month 350: Balance is tiny. Almost no interest accrues. Nearly the entire payment goes to principal.

How to Read the Table

An amortization schedule typically has columns for:

Payment Date
Payment Amount (Fixed)
Interest Paid (Decreases over time)
Principal Paid (Increases over time)
Remaining Balance

The "Tipping Point"

On a 30-year loan, you usually don't reach the "tipping point"—where you pay more principal than interest in a month—until roughly year 18 or 19.

Why It Matters

Understanding amortization is the key to wealth building.

Motivation: Seeing that only $200 of your payment is going to principal might make you angry enough to add an extra $50/month. That $50 goes 100% to principal, effectively boosting your "equity payment" by 25%!
Refinance Decisions: If you are at year 20 of a mortgage, you are paying mostly principal. Refinancing to a new 30-year loan throws you back to year 1, where payments are mostly interest.
Selling: It explains why, after owning a home for 5 years, you might not have as much equity as you thought (assuming home prices stayed flat).

Summary

Don't ignore the amortization schedule. Print it out. Circle the date where you reach the tipping point. Then, use extra payments to move that date forward.

View your loan's full schedule with our Amortization Calculator.