$150,000 mortgage at 8%: monthly payment over 30 and 15 years
At 8%, a $150,000 mortgage amortizes at $1,100.65 a month over 30 years and $1,433.48 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 | $1,100.65 | $1,433.48 |
| Total interest over the term | $246,233 | $108,026 |
| Total paid (principal + interest) | $396,233 | $258,026 |
| Interest as a share of total paid | 62% | 42% |
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.
Balance and equity over time (30-year loan)
Year one: $13,208 paid, $11,955 of it interest, $1,253 principal. That ratio is why equity builds slowly at first and why extra principal payments early are worth the most.
| After | Remaining balance | Paid down |
|---|---|---|
| 5 years | $142,605 | $7,395 |
| 10 years | $131,587 | $18,413 |
| 15 years | $115,172 | $34,828 |
| 20 years | $90,717 | $59,283 |
| 25 years | $54,282 | $95,718 |
PMI tipping points: 80% and 78%
If this loan was more than 80% of the home’s original value, private mortgage insurance applies until the balance falls to 80% (cancellation on request) and 78% (automatic). By the schedule alone, with no extra payments or appreciation:
| Starting LTV | Home value | 80% (request) | 78% (automatic) |
|---|---|---|---|
| 97% | $154,639 | month 152 | month 163 |
| 95% | $157,895 | month 142 | month 154 |
| 90% | $166,667 | month 112 | month 127 |
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 $1,100.65 payment, the usual 4% to 5% late fee is $44.03 to $55.03 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 = $150,000, r = 8% ÷ 12 = 0.6667% per month, n = 360 (30 years) or 180 (15 years).
Same formula every lender uses; differences between quotes come from the rate, points and fees, never from the arithmetic. Balance after k payments: P(1 + r)k − M((1 + r)k − 1) ÷ r.
Frequently asked questions
What is the monthly payment on a $150,000 mortgage at 8%?
$1,100.65 a month for principal and interest on a 30-year fixed loan, or $1,433.48 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 $150,000 loan at 8%?
$246,233 over 30 years, or $108,026 over 15 years, if every payment is made as scheduled with no extra principal. In the first year of the 30-year loan, about $11,955 of your $13,208 in payments is interest and $1,253 reduces the balance.
When can I cancel PMI on a $150,000 loan at 8%?
By the regular schedule alone, a loan that started at 95% of the home’s value reaches 80% loan-to-value in month 142 (when you may request cancellation) and 78% in month 154 (automatic cancellation). Extra principal payments or an appraisal showing appreciation can move that earlier.
Same amount, other rates: 5% · 6% · 7%. Same rate, other amounts: $200,000 · $250,000 · $300,000 · $350,000 · $400,000 · $500,000 · $600,000 · $800,000. All tables.