$300,000 Mortgage at 4% for 30 Years
Monthly payment breakdown for a fixed-rate 30-year home loan.
Monthly Payment
$1,432
Principal: $300,000 · Rate: 4%
| Item | Amount |
|---|---|
| Loan Principal | $300,000 |
| Total Interest (30 years) | $215,609 |
| Total Paid | $515,609 |
Amortization Schedule (Yearly Summary)
How your payments are split between principal and interest each year.
| Year | Principal Paid | Interest Paid | Remaining Balance |
|---|---|---|---|
| 1 | $5,283 | $11,904 | $294,717 |
| 2 | $5,498 | $11,689 | $289,219 |
| 3 | $5,722 | $11,465 | $283,496 |
| 4 | $5,956 | $11,231 | $277,541 |
| 5 | $6,198 | $10,989 | $271,343 |
| 6 | $6,451 | $10,736 | $264,892 |
| 7 | $6,713 | $10,473 | $258,178 |
| 8 | $6,987 | $10,200 | $251,191 |
| 9 | $7,272 | $9,915 | $243,920 |
| 10 | $7,568 | $9,619 | $236,352 |
| 30 | $16,820 | $367 | $0 |
Rate Comparison — $300K Loan
| Rate | Monthly Payment | Total Interest | Total Paid |
|---|---|---|---|
| 4.5% | $1,520 | $247,220 | $547,220 |
| 4% (current) | $1,432 | $215,609 | $515,609 |
Understanding a $300K Mortgage at 4%
A $300,000 fixed-rate mortgage at 4% interest over 30 years results in a monthly payment of $1,432. Over the full loan term, you will pay $215,609 in interest — roughly 0.7× the original loan amount.
In the early years, most of your payment goes toward interest. By year 10, approximately $7,568 of your annual payments go to principal and $9,619 to interest. Over time, the balance shifts as the principal portion grows.
Frequently Asked Questions
What is the monthly payment on a $300,000 mortgage at 4%?
The monthly payment on a $300,000 mortgage at 4% interest for 30 years is $1,432. Over the life of the loan, you will pay $215,609 in interest, for a total of $515,609.
How much total interest will I pay on a $300,000 mortgage at 4%?
On a $300,000 mortgage at 4% over 30 years, you will pay $215,609 in total interest. This means you pay roughly 0.7x the original loan amount in interest alone.
How does 4% compare to other mortgage rates?
At 4% on a $300,000 30-year loan, the monthly payment is $1,432. A 0.5% rate decrease would save approximately $85/month, while a 0.5% increase would add about $88/month.
How This Is Calculated
This page uses the standard fixed-rate amortization formula to compute the monthly mortgage payment:
M = P × [r(1+r)n] / [(1+r)n − 1]
Where P = $300,000 (loan principal), r = 0.003333 (monthly interest rate = 4% ÷ 12), and n = 360 (total payments = 30 years × 12 months).
Standard amortization formula. Assumes fixed-rate loan, no PMI, taxes, or insurance.
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⚠️ Estimates only. Actual mortgage costs may include PMI, property tax, insurance, and HOA fees. Consult a lender for precise figures.