A mortgage is a long-term loan backed by your home: you borrow money now and pay it back, with interest, in monthly payments over 15 to 30 years.
What is a mortgage?
A mortgage is a loan to buy a home (or to refinance one you own). The home itself is the security for the loan. That means the lender puts a lien on the property: a legal claim that stays on the home until the loan is paid off.
You live in the home and own it. But if payments stop for a long time, the lender can use that claim to take the home back and sell it. That process is called foreclosure. It is usually a last resort, and there are often options if you fall behind and reach out early. Still, it's the reason to pick a payment you can keep up with, not just one you can qualify for.
Principal, interest and the loan term
Principal is the amount you borrow. Interest is what the lender charges you to borrow it. Your term is how many years you have to pay it back. The most common terms are:
- 30 years: a lower monthly payment, but you pay much more interest over the life of the loan.
- 15 years: a higher monthly payment, but you pay the loan off in half the time and pay far less interest overall.
Fixed or adjustable?
With a fixed-rate mortgage, the interest rate never changes, so your principal-and-interest payment stays the same for the whole term. With an adjustable-rate mortgage (ARM), the rate is fixed for a set time, often 5, 7 or 10 years, and then it can go up or down on a schedule. An ARM may start lower, but your payment could rise later.
What's in your monthly payment: PITI
Your mortgage payment is usually more than the loan itself. Lenders call it PITI (principal, interest, taxes and insurance):
- Principal and interest pay back the loan.
- Property taxes go to your city or county.
- Homeowners insurance protects the home against things like fire or storms.
If you buy a condo or a home in a community with a homeowners association, add the dues and it becomes PITIA (the A is for association). With a small down payment, mortgage insurance may be added too. Many lenders collect taxes and insurance each month into an escrow account and pay those bills for you.
Example monthly payment: $2,545.91
- Principal + interest
- Property taxes
- Homeowners insurance
Why early payments are mostly interest
Each month, interest is figured on the balance you still owe. At the start, you owe the most, so most of your payment goes to interest. As the balance shrinks, less goes to interest and more goes to principal. This slow shift is called amortization. Your payment stays the same; only the split changes.
Worked example: a $300,000 loan
Say you borrow $300,000 for 30 years at an example rate of 7% (not a quote). The standard payment formula gives:
| Monthly rate | 7% ÷ 12 = 0.5833% |
|---|---|
| Number of payments | 30 years × 12 = 360 |
| Principal + interest | about $1,995.91 a month |
| First month's interest | $300,000 × 0.5833% = $1,750.00 |
| First month's principal | $1,995.91 − $1,750.00 = $245.91 |
| Add example taxes + insurance | $1,995.91 + $400 + $150 = $2,545.91 (PITI) |
So in month one, only about $246 of a nearly $2,000 loan payment lowers what you owe. If you kept this loan the full 30 years with no extra payments, you would pay about $418,500 in interest. Your own rate, taxes and insurance will be different.
Where your first $1,995.91 goes
- Interest
- Principal (lowers your balance)
Who's involved
- You, the borrower: you sign the loan and make the payments.
- The lender: approves the loan and provides the money.
- The servicer: the company that collects your payments and runs your escrow account. It may not be the same company as your lender.
- The appraiser: gives an independent opinion of what the home is worth.
- The title company or closing attorney: checks that the seller can legally sell the home and handles the closing.
What this means for you
When you shop for a home, budget for the whole payment (PITI or PITIA), not just principal and interest. A 30-year loan keeps the payment lower; a 15-year loan saves interest. A fixed rate gives you a steady principal-and-interest payment; an adjustable rate can change later. Pick the payment you can live with month after month.
Mistakes to avoid
- Looking only at the principal-and-interest number and forgetting taxes, insurance, HOA dues and mortgage insurance.
- Assuming an adjustable-rate payment will stay the same after the fixed period ends.
- Thinking a "fixed" payment can never change. Taxes and insurance in escrow can still go up or down.
- Waiting too long to call your servicer if money gets tight. Reach out early.
Words to know
- Principal
- Interest
- Amortization
- PITI
- Escrow
- Adjustable-rate mortgage
- Lien
- Servicer
See the full mortgage glossary →
Frequently asked questions
Is a 15-year or a 30-year mortgage better?
Neither is always better. A 15-year loan has a higher monthly payment but costs much less interest overall. A 30-year loan has a lower payment, which can leave more room in your budget. Many people choose the payment that fits comfortably.
If my rate is fixed, can my payment still change?
Your principal-and-interest payment stays the same. But if your lender collects property taxes and insurance through escrow, your total payment can go up or down when those bills change.
What should I do if I can't make a payment?
Call your loan servicer as soon as you can, before you miss a payment if possible. Ask what help is available. Free help from a HUD-approved housing counselor is also available.
What is escrow?
Escrow is an account your servicer uses to collect part of your property taxes and homeowners insurance each month, then pay those bills for you when they're due.
Sources
- CFPB: Buying a House (Owning a Home)
- HUD: Find a housing counselor
- Payment math uses the standard fixed-rate amortization formula; the 7% rate is an example only, not a quote.
Educational information only, not an offer, approval or financial advice. LoanFight is not a lender; we review your scenario before connecting you with an appropriate lending partner.
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