What is an amortization schedule?

An amortization schedule is the month-by-month breakdown of how each loan payment splits between principal and interest. At month 1, almost all of your payment is interest (the balance is largest). By the final payment, almost all of it goes to principal. The schedule shows exactly when the split crosses 50/50 — usually around the 2/3rds mark of the loan term.

Why is so much of my first payment interest?

Interest accrues on the outstanding balance each month. On a $300K loan at 7%, month-1 interest is $300,000 × (7% / 12) = $1,750. Your payment is ~$1,996 (fixed for the whole term), so only $246 reduces principal in month 1. As the balance shrinks, the interest portion shrinks and the principal portion grows.

When does principal start exceeding interest in a typical mortgage?

On a 30-year fixed at 7%, the crossover is around month 230 (year 19). At 5% it's earlier (around year 16), and at 9% it's later (around year 22). The calculator surfaces the exact crossover month for your specific inputs in the 'Principal-crossover point' row.

How is the monthly payment calculated?

Standard amortization formula: payment = P × R × (1+R)^N / ((1+R)^N − 1), where P is principal, R is the monthly interest rate (annual rate ÷ 12 ÷ 100), and N is the total number of monthly payments. The formula keeps the payment constant for the entire term, so the principal/interest split changes month by month.

Does extra principal payment change the schedule meaningfully?

Dramatically. An extra $100/month on a 30-year $300K mortgage at 7% saves ~$80,000 in interest and shortens the loan by ~5 years. The reason: every extra dollar of principal eliminates the interest that would have accrued on that dollar for every remaining month. Early extras compound the most.

Why does my bank's schedule show slightly different numbers?

Three reasons. (1) Banks usually round monthly payments up to the nearest cent or dollar and adjust the final payment. (2) Some loans use daily-accrual rather than monthly-accrual interest, creating 1–3 dollar variances. (3) Mortgage payments may include escrow (tax + insurance), which a pure amortization schedule excludes. Our schedule is P&I only — match it against the P&I line on your bank's statement, not the total payment.

What's the difference between amortization and an interest-only loan?

Amortizing loans repay principal in every payment, so the balance goes down each month. Interest-only loans charge only the interest for an initial period (often 5–10 years) — the balance stays flat. After the IO period ends, the loan re-amortizes over a shorter remaining term, which dramatically increases the monthly payment. Most modern US residential mortgages are fully amortizing.

Can this calculator handle variable-rate (ARM) loans?

No — it assumes a fixed rate for the full term. For a 5/1 ARM, run two passes: one at the teaser rate for the first 5 years to see the initial schedule, then re-run with the worst-case lifetime-cap rate (usually +5% from start) and the remaining 25 years of balance to see the worst-case re-amortized payment.

What's the relationship between term length and total interest paid?

Longer term = lower monthly, but much higher total interest. On $300K at 7%: 15-year = $2,696/month, $185K total interest. 30-year = $1,996/month, $419K total interest. The 30-year is $700/month cheaper but costs $234K more in interest over the life of the loan. Term length is the single biggest cost lever.

How does refinancing reset the amortization schedule?

A refinance pays off the original loan and starts a new one — typically at a new rate and a fresh term. If you started year 5 of a 30-year and refi to a new 30-year, you're back to a payment that's mostly interest. To preserve interest savings, refinance to a shorter remaining term (e.g., 25-year) when possible — the monthly is similar but you don't restart the front-loaded-interest clock.

What's the right way to pay off a mortgage faster without refinancing?

Three proven approaches. (1) Bi-weekly payments — 26 half-payments per year = effectively 13 full payments, cutting 4–5 years off a 30-year. (2) Annual lump-sum prepayment from a tax refund or bonus — even one $5K extra in year 2 saves ~$15K in lifetime interest on a typical mortgage. (3) Round up the monthly payment to the next $100 — small monthly habit, large cumulative effect.

Are amortization schedules used for things other than mortgages?

Yes — any fixed-rate, fixed-term, fully amortizing loan uses the same math: auto loans, personal loans, student loans (federal Direct), small-business term loans, and equipment financing. Credit cards do NOT amortize (revolving + variable balance + daily compounding), and HELOCs in the draw period are typically interest-only.

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Amortization Schedule Calculator — Monthly P&I Split + Payoff Date + Milestones

Drop loan amount, rate, term, and start date — get the full amortization profile: monthly payment, total interest, payoff date, principal-crossover month, and key milestone balances. Same math banks use; surfaced so you can see exactly when interest stops dominating.

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Reviewed by CalcBold Editorial · Sources: CFPB Amortization guide + IRS Pub 936 + Fannie Mae lending standardsLast verified May 15, 2026Methodology

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Frequently Asked Questions

The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.

What is an amortization schedule?
An amortization schedule is the month-by-month breakdown of how each loan payment splits between principal and interest. At month 1, almost all of your payment is interest (the balance is largest). By the final payment, almost all of it goes to principal. The schedule shows exactly when the split crosses 50/50 — usually around the 2/3rds mark of the loan term.
Why is so much of my first payment interest?
Interest accrues on the outstanding balance each month. On a $300K loan at 7%, month-1 interest is $300,000 × (7% / 12) = $1,750. Your payment is ~$1,996 (fixed for the whole term), so only $246 reduces principal in month 1. As the balance shrinks, the interest portion shrinks and the principal portion grows.
When does principal start exceeding interest in a typical mortgage?
On a 30-year fixed at 7%, the crossover is around month 230 (year 19). At 5% it's earlier (around year 16), and at 9% it's later (around year 22). The calculator surfaces the exact crossover month for your specific inputs in the 'Principal-crossover point' row.
How is the monthly payment calculated?
Standard amortization formula: payment = P × R × (1+R)^N / ((1+R)^N − 1), where P is principal, R is the monthly interest rate (annual rate ÷ 12 ÷ 100), and N is the total number of monthly payments. The formula keeps the payment constant for the entire term, so the principal/interest split changes month by month.
Does extra principal payment change the schedule meaningfully?
Dramatically. An extra $100/month on a 30-year $300K mortgage at 7% saves ~$80,000 in interest and shortens the loan by ~5 years. The reason: every extra dollar of principal eliminates the interest that would have accrued on that dollar for every remaining month. Early extras compound the most.
Why does my bank's schedule show slightly different numbers?
Three reasons. (1) Banks usually round monthly payments up to the nearest cent or dollar and adjust the final payment. (2) Some loans use daily-accrual rather than monthly-accrual interest, creating 1–3 dollar variances. (3) Mortgage payments may include escrow (tax + insurance), which a pure amortization schedule excludes. Our schedule is P&I only — match it against the P&I line on your bank's statement, not the total payment.
What's the difference between amortization and an interest-only loan?
Amortizing loans repay principal in every payment, so the balance goes down each month. Interest-only loans charge only the interest for an initial period (often 5–10 years) — the balance stays flat. After the IO period ends, the loan re-amortizes over a shorter remaining term, which dramatically increases the monthly payment. Most modern US residential mortgages are fully amortizing.
Can this calculator handle variable-rate (ARM) loans?
No — it assumes a fixed rate for the full term. For a 5/1 ARM, run two passes: one at the teaser rate for the first 5 years to see the initial schedule, then re-run with the worst-case lifetime-cap rate (usually +5% from start) and the remaining 25 years of balance to see the worst-case re-amortized payment.
What's the relationship between term length and total interest paid?
Longer term = lower monthly, but much higher total interest. On $300K at 7%: 15-year = $2,696/month, $185K total interest. 30-year = $1,996/month, $419K total interest. The 30-year is $700/month cheaper but costs $234K more in interest over the life of the loan. Term length is the single biggest cost lever.
How does refinancing reset the amortization schedule?
A refinance pays off the original loan and starts a new one — typically at a new rate and a fresh term. If you started year 5 of a 30-year and refi to a new 30-year, you're back to a payment that's mostly interest. To preserve interest savings, refinance to a shorter remaining term (e.g., 25-year) when possible — the monthly is similar but you don't restart the front-loaded-interest clock.
What's the right way to pay off a mortgage faster without refinancing?
Three proven approaches. (1) Bi-weekly payments — 26 half-payments per year = effectively 13 full payments, cutting 4–5 years off a 30-year. (2) Annual lump-sum prepayment from a tax refund or bonus — even one $5K extra in year 2 saves ~$15K in lifetime interest on a typical mortgage. (3) Round up the monthly payment to the next $100 — small monthly habit, large cumulative effect.
Are amortization schedules used for things other than mortgages?
Yes — any fixed-rate, fixed-term, fully amortizing loan uses the same math: auto loans, personal loans, student loans (federal Direct), small-business term loans, and equipment financing. Credit cards do NOT amortize (revolving + variable balance + daily compounding), and HELOCs in the draw period are typically interest-only.

Amortization Schedule Calculator

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