Loan Amortization Calculator
Get your complete monthly payment schedule showing exactly how much goes to principal vs. interest — and see how extra payments can save you thousands.
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Why Early Payments Are So Powerful
In the early years of a loan, most of your payment goes toward interest rather than principal. On a 30-year $300,000 mortgage at 7%, your first payment sends about $1,750 to interest and only $246 to principal.
Extra payments hit principal directly, which shrinks future interest charges. An extra $200/month on that same loan saves over $90,000 in interest and pays it off 6+ years early.
Loan Amortization: Real Payment Schedule Examples
Example 1: $300,000 Mortgage at 7% — First Year Breakdown
On a $300,000 30-year mortgage at 7%, your monthly P&I payment is $1,996. In month 1, $1,750 goes to interest and only $246 reduces your principal. By month 12 you have paid $23,952 but your balance has only dropped from $300,000 to $297,100 — a reduction of just $2,900. This is why extra payments early in a mortgage are so powerful: every dollar of principal you eliminate saves 30 years of compound interest on that dollar.
Example 2: Extra $200/Month on a $250,000 Loan
A $250,000 30-year mortgage at 6.75% with a standard payment of $1,621/month costs $333,560 in total interest over 30 years. Adding $200/month extra pays off the loan in 23 years and 4 months — 6 years and 8 months early — and reduces total interest to $240,800. You save $92,760 in interest and 80 months of payments for a total extra investment of just $22,400 extra paid in.
Example 3: $25,000 Auto Loan at 6.5% — 48 vs. 60 Months
A $25,000 auto loan at 6.5% for 60 months gives a monthly payment of $488 and total interest of $4,280. Choosing 48 months instead raises the payment to $593/month (+$105) but cuts total interest to $3,464 — saving $816. The amortization table makes this visible: in a 60-month loan, nearly 30% of the first year goes to interest versus under 25% in a 48-month loan.
Example 4: Student Loan Payoff — Standard vs. Aggressive
A $35,000 student loan at 5.5% on a standard 10-year plan has a payment of $380/month and $10,600 in total interest. Switching to a 5-year payoff by paying $671/month cuts total interest to $5,250 — saving $5,350. Or, staying on the 10-year plan but adding $200/month extra pays it off in just under 7 years and saves $3,800 in interest — a middle-ground approach many borrowers find manageable.