$300,000 mortgage at 6%: monthly payment over 30 and 15 years
At 6%, a $300,000 mortgage amortizes at $1,798.65 a month over 30 years and $2,531.57 over 15. This page lays out the consequences of that rate on that balance, all computed: interest paid, equity built, when PMI ends, and the cost of paying late.
| 30-year fixed | 15-year fixed | |
|---|---|---|
| Monthly principal & interest | $1,798.65 | $2,531.57 |
| Total interest over the term | $347,515 | $155,683 |
| Total paid (principal + interest) | $647,515 | $455,683 |
| Interest as a share of total paid | 54% | 34% |
Principal and interest only. Property taxes, homeowners insurance, mortgage insurance and HOA dues are added to the actual payment. Rates shown are for the arithmetic, not an offer; see 30-year vs 15-year for how to choose.
Where the payments go: the 30-year amortization
Of the first twelve payments ($21,584), interest takes $17,900 and principal $3,684. The table shows the remaining balance at five-year marks.
| After | Remaining balance | Paid down |
|---|---|---|
| 5 years | $279,163 | $20,837 |
| 10 years | $251,057 | $48,943 |
| 15 years | $213,147 | $86,853 |
| 20 years | $162,011 | $137,989 |
| 25 years | $93,036 | $206,964 |
Reaching 80% loan-to-value
The Homeowners Protection Act sets two thresholds on the original value — 80% on request, 78% automatic. Here is when the regular amortization of this loan reaches them, depending on how much was put down:
| Starting LTV | Home value | 80% (request) | 78% (automatic) |
|---|---|---|---|
| 97% | $309,278 | month 127 | month 138 |
| 95% | $315,789 | month 118 | month 129 |
| 90% | $333,333 | month 89 | month 103 |
Extra principal payments or a new appraisal showing appreciation can bring cancellation forward — see PMI removal. FHA mortgage insurance follows different rules.
Missing a payment on this loan
On a $1,798.65 payment, the usual 4% to 5% late fee is $71.95 to $89.93 once the grace period ends. The fee is the small cost; the 30-day credit mark is the large one. Before it happens: the first 72 hours after a missed payment.
The arithmetic behind the table
M = P × r(1 + r)n ÷ ((1 + r)n − 1), where P = $300,000, r = 6% ÷ 12 = 0.5000% per month, n = 360 (30 years) or 180 (15 years).
This is the standard fixed-rate amortization — the payment is constant, the interest share falls each month as the balance falls. Balance after k payments: P(1 + r)k − M((1 + r)k − 1) ÷ r.
Frequently asked questions
What is the monthly payment on a $300,000 mortgage at 6%?
$1,798.65 a month for principal and interest on a 30-year fixed loan, or $2,531.57 on a 15-year fixed loan. Property taxes, homeowners insurance, mortgage insurance and any HOA dues are added on top and typically raise the total payment by 25% to 50%.
How much interest will I pay on a $300,000 loan at 6%?
$347,515 over 30 years, or $155,683 over 15 years, if every payment is made as scheduled with no extra principal. In the first year of the 30-year loan, about $17,900 of your $21,584 in payments is interest and $3,684 reduces the balance.
When can I cancel PMI on a $300,000 loan at 6%?
By the regular schedule alone, a loan that started at 95% of the home’s value reaches 80% loan-to-value in month 118 (when you may request cancellation) and 78% in month 129 (automatic cancellation). Extra principal payments or an appraisal showing appreciation can move that earlier.
Same amount, other rates: 5% · 7% · 8%. Same rate, other amounts: $150,000 · $200,000 · $250,000 · $350,000 · $400,000 · $500,000 · $600,000 · $800,000. All tables.