A quoted mortgage rate gives you one number: principal and interest. The bill that actually arrives, plus the association dues you pay separately, can be a third higher. Knowing which parts are fixed, which change and which can end lets you budget for the real cost and spot what is negotiable.
The six parts, and who receives each one
| Component | Paid to | Fixed or variable | Can it end? |
|---|---|---|---|
| Principal | Lender, reduces your balance | Grows within a fixed payment | At payoff |
| Interest | Lender | Shrinks within a fixed payment | At payoff |
| Property tax | Local government, often via escrow | Changes with assessments and rates | No |
| Homeowners insurance | Insurer, often via escrow | Changes at renewal | No, while a lender requires it |
| Mortgage insurance (PMI) | Insurer, collected by servicer | Set by the policy | Often, for conventional loans |
| HOA dues | Homeowners association | Set by the association | No |
The CFPB describes the total monthly payment as principal plus interest plus mortgage insurance, if applicable, plus escrow for homeowners insurance and tax. That is the PITI figure, with PMI added when it applies. HOA dues sit outside it: the CFPB says they are usually paid directly to the association rather than to the servicer, but they are still a monthly housing cost and lenders count them when judging what you can carry.
A worked monthly cost with 10% down
Take a 350,000 home bought with 35,000 down, leaving 315,000 financed at a fixed 6.5% for 30 years. Property tax is estimated at 4,200 a year, homeowners insurance at 1,800 a year and HOA dues at 75 a month. The 130 monthly mortgage-insurance figure is a placeholder for illustration; real premiums depend on the loan, credit and insurer, so use the amount on your Loan Estimate.
| Line | How it is found | Monthly |
|---|---|---|
| Principal and interest | 315,000 × 0.0054167 ÷ (1 − 1.0054167^−360) | 1,991.01 |
| Property tax | 4,200 ÷ 12 | 350.00 |
| Homeowners insurance | 1,800 ÷ 12 | 150.00 |
| Mortgage insurance | Entered from quote | 130.00 |
| Payment to servicer (PITI + PMI) | Sum of the four lines above | 2,621.01 |
| HOA dues | Paid to association | 75.00 |
| Monthly housing cost | All six parts | 2,696.01 |
Principal and interest are 74% of the total here. The other 705.00 a month is 8,460 a year that no rate quote reveals. Over the scheduled 30 years, interest alone comes to 401,765.14, more than the loan itself.
Mortgage CalculatorEnter your price, down payment, rate, tax, insurance, HOA and PMI quote to see each line and the monthly total.How a 20% down payment changes the lines
The CFPB explains that PMI may be required on a conventional loan with a down payment below 20%. Rerunning the same home with 70,000 down, and no mortgage insurance, shows which lines move and which do not.
| Line | 10% down (35,000) | 20% down (70,000) | Difference |
|---|---|---|---|
| Amount financed | 315,000 | 280,000 | 35,000 |
| Principal and interest | 1,991.01 | 1,769.79 | 221.22 |
| Property tax | 350.00 | 350.00 | 0 |
| Homeowners insurance | 150.00 | 150.00 | 0 |
| Mortgage insurance | 130.00 | 0.00 | 130.00 |
| HOA dues | 75.00 | 75.00 | 0 |
| Monthly housing cost | 2,696.01 | 2,344.79 | 351.22 |
| Interest over 30 years | 401,765.14 | 357,124.57 | 44,640.57 |
Tax, insurance and HOA are set by the property, not the loan, so the extra 35,000 down touches only principal, interest and PMI. Whether that trade is worth it depends on what else the 35,000 could do for you and whether it would leave you without reserves for repairs.
When PMI ends on a conventional loan
For conventional mortgages on single-family principal residences that closed on or after July 29, 1999, the CFPB summarizes three federal points. You can ask the servicer to cancel PMI when the balance is scheduled to reach 80% of the home's original value. The servicer must end it automatically when the balance is scheduled to reach 78%. And it must end the month after the loan's amortization midpoint, which is 15 years on a 30-year loan. Cancellation on request also requires a written request, a good payment record, no junior liens and evidence that the home has not lost value. FHA and VA loans follow different rules.
In the 10%-down example, 80% of the 350,000 original value is 280,000. On the regular schedule the balance first falls to that level around payment 95, a little under 8 years in, and to 78% (273,000) around payment 109. The CFPB also notes you can ask early if extra payments bring the balance to 80% sooner; the extra-payment guide shows how much faster the balance falls. Use your servicer's own schedule for the actual date, since its rounding and payment dates differ slightly from this model.
Amortization CalculatorFind the month your balance first reaches 80% or 78% of the original value.Why the escrowed lines change every year
Your servicer estimates the year's tax and insurance bills, collects one-twelfth each month and reviews the account periodically. If the county reassesses the home or the insurer raises the premium, the escrow share rises and so does your payment, even though principal and interest stay at 1,991.01. If there is a shortage, the servicer may also spread the catch-up over the next year. Budget for these lines to move.
What this breakdown leaves out
- Closing costs and upfront premiums. Some mortgage insurance is paid as a single premium at closing or financed into the loan, which changes the principal rather than adding a monthly line.
- Maintenance, utilities and special assessments. These are real costs of owning that no lender collects. The rent-versus-buy guide treats them as a yearly percentage of home value.
- Adjustable rates. If the rate can reset, principal and interest are only fixed until the first adjustment.
- Qualification. A lender judges the full housing payment against your income using its own debt-to-income limits; see how DTI caps the loan amount, or test a limit in the Loan Affordability calculator.