How Do Mortgage Interest Rates Work and How Do They Affect My Payment in San Diego?

Interest Rate: The Cost of Borrowing

Your mortgage interest rate is the annual cost your lender charges for lending you money — expressed as a percentage of the loan balance. The rate has an enormous impact on your monthly payment and total cost over the life of the loan. In San Diego's high-price market, even a quarter-point rate difference can mean $100 to $200 per month.

How a Rate Change Affects Your Payment

On a $700,000 San Diego loan, the difference between a 6.5 percent and a 7.0 percent interest rate is approximately $220 per month. Over 30 years, that difference amounts to nearly $80,000 in additional interest paid. This is why shopping multiple lenders and rate strategies matters significantly in San Diego.

Factors That Affect the Rate You Are Offered

• Credit score: Higher scores receive lower rates — 760+ typically gets the best conventional rates
• Down payment: More down reduces lender risk and often results in a lower rate
• Loan type: VA loans often offer the lowest rates; FHA rates are competitive
• Loan term: 15-year loans carry lower rates than 30-year but higher monthly payments
• Market conditions: Federal Reserve policy and bond markets drive the base rate environment

Fixed vs. Adjustable Rate Mortgages

A fixed-rate mortgage locks your interest rate for the entire loan term. An adjustable-rate mortgage (ARM) offers a lower initial rate for a fixed period — typically 5, 7, or 10 years — before adjusting to market rates annually. In a high-rate environment, ARMs can offer payment relief but carry the risk of future rate increases.

Shopping for the Best Rate

Even a 0.25 percent rate difference on a San Diego mortgage is significant over 30 years. Shop with 3 or more lenders, compare Loan Estimates on the same day for the most accurate comparison, and consider a mortgage broker who can access multiple lenders simultaneously. Rieder Homes Group can refer you to trusted San Diego lenders with competitive rates.

Related Reading on RiederHomes.com:

→ Blog #2: Mortgage Pre-Approval

→ Blog #8: Should I Lock My Rate?

→ Blog #1: How Much Can I Afford?

→ Blog #15: Adjustable Rate Mortgages

— Mance Rieder, Broker Associate | Rieder Homes Group | REAL Broker | riederhomes.com | 858-295-0556