Mortgage basics: what you are actually paying for

A mortgage is a long-term loan secured against a home. The headline interest rate matters, but it is only one part of the cost. Understanding the structure makes it much easier to compare offers.

PITI: the four-part payment

Most US mortgage payments include:

• Principal — the part that reduces what you owe.
• Interest — the lender's charge on the outstanding balance.
• Taxes — local property tax, often collected monthly in escrow.
• Insurance — homeowners insurance, and sometimes mortgage insurance.

HOA dues are separate. If your down payment is under 20%, lenders usually require private mortgage insurance (PMI) until the balance falls to 78–80% of the home's original value, though rules vary.

Amortization: why early payments feel slow

A fixed-rate mortgage has a level monthly principal-and-interest payment. Early on, most of that payment is interest because the balance is high. Over time, more goes to principal.

On a 30-year loan at 6.5%, the first payment on a $320,000 loan is roughly $2,023. About $1,733 is interest and only $290 is principal. By the final year, the split is almost entirely principal.

This is why extra payments early have an outsized effect on total interest. Even a modest extra amount can shorten the loan by years. Check that your lender applies extra funds to principal and that there is no prepayment penalty.

Fixed versus adjustable

• Fixed-rate keeps the rate the same for the full term. Predictable, usually slightly higher at the start.
• Adjustable-rate (ARM) is fixed for an initial period, then adjusts periodically. It can be cheaper if you move or refinance before the first adjustment, but the payment can rise.

An ARM is not automatically risky or automatically clever. It depends on how long you will keep the loan and how much payment change you can absorb.

Escrow

An escrow account collects part of your tax and insurance bill each month and pays the bills when due. It protects the lender and smooths your budgeting, but the monthly amount can change when taxes or insurance premiums change.

Closing costs and cash needed

Beyond the down payment, expect lender fees, appraisal, title work, recording fees, prepaid interest and escrow deposits. Closing costs commonly run a few percent of the loan amount. Ask for a Loan Estimate and compare it line by line.

Pre-qualification versus pre-approval

• Pre-qualification is a quick, often informal estimate based on what you tell the lender.
• Pre-approval involves verification of income, assets and credit. It carries more weight with sellers but is still not a guarantee of final approval.

Affordability

Lenders use debt-to-income ratios, credit history and reserves. A common rule of thumb is to keep housing costs near 28% of gross monthly income and total debt near 36%, but these are guides, not rules. Childcare, transport, student loans and maintenance all matter.

Refinancing and rate locks

Refinancing replaces an existing mortgage, usually to lower the rate, change the term or access equity. Closing costs apply, so calculate the break-even point. A rate lock protects a quoted rate for a set period; ask what happens if closing is delayed.

This guide is general information, not financial advice. Your lender's Loan Estimate and a qualified professional are the authoritative sources for your situation.