The things that determine your rate are mostly about you, not the market

Your mortgage rate depends on five concrete factors: your credit score, how much you are putting down, the loan term you choose, the type of loan (fixed or adjustable), and current market conditions. You control the first three. The fourth is your choice. Only the fifth is outside your hands.

Banks price risk. A borrower with a 750 credit score and 20 percent down poses less risk than one with a 620 score and 3 percent down, so that first borrower gets a lower rate. A 15-year loan means you pay it back faster, so that carries less risk than a 30-year loan. These are not negotiable discounts—they are how lenders calculate what rate you actually deserve.

This means the single most effective way to lower your rate is to improve your credit score before you apply. The second is to save a larger down payment. Everything else—shopping lenders, locking your rate at the right time, choosing the right loan structure—matters, but it matters less than those two things.

Key Takeaways

  • Your credit score is the largest factor you control; a 50-point improvement can lower your rate by 0.25 to 0.5 percent, which saves tens of thousands over the life of the loan.
  • A down payment of 20 percent or more removes the requirement for mortgage insurance, which adds 0.5 to 1 percent to your rate if you put down less.
  • Comparing offers from at least three lenders takes a few hours and can reveal rate differences of 0.25 to 0.75 percent for the same loan.
  • Locking your rate protects you if rates rise before closing, but you pay a small fee for that protection and lose the benefit if rates fall.
  • A 15-year loan carries a lower rate than a 30-year loan, but your monthly payment will be roughly 50 percent higher.

How your credit score changes your rate

Lenders pull your credit report and score when you apply. Most mortgage lenders use FICO scores, and they typically look at the middle score if three bureaus report different numbers. A score of 740 or above usually qualifies for the best rates a lender is offering that day. A score of 700 to 739 typically costs you 0.25 to 0.5 percent more. Below 680, the gap widens.

If your score is below 740, spending three to six months paying down credit card balances and making all payments on time before you apply can move your score up by 30 to 100 points. That translates directly into a lower rate. On a $300,000 loan, a 0.5 percent rate reduction saves you roughly $150 per month, or $54,000 over 30 years.

You can check your own credit score for free through AnnualCreditReport.com, which is the official site for the three major bureaus (Equifax, Experian, and TransUnion). Dispute any errors you find before you apply for the mortgage.

Why your down payment size matters so much

If you put down less than 20 percent, lenders require you to carry private mortgage insurance (PMI). This is insurance that protects the lender if you default, and you pay the premium as part of your monthly payment. PMI typically adds 0.5 to 1 percent to your effective rate.

Saving to 20 percent down eliminates this cost entirely. If you are close—say at 15 percent—the math often favors waiting a few more months to reach 20 percent rather than paying PMI for years. On a $300,000 home with 15 percent down, PMI costs roughly $200 to $300 per month. At 20 percent down, that cost disappears.

If you cannot reach 20 percent, putting down as much as you can still helps. Each additional percentage point of down payment lowers your rate slightly and reduces the PMI amount. A 10 percent down payment costs less in PMI than a 5 percent down payment.

Comparing lenders reveals real rate differences

Rates vary between lenders even on the same day for the same borrower. One bank might offer 6.75 percent while another offers 7.0 percent. That 0.25 percent difference costs you roughly $50 per month on a $300,000 loan, or $18,000 over 30 years.

To compare fairly, request a Loan Estimate from at least three lenders. This is a standardized form that shows the interest rate, points, fees, and monthly payment. Federal law requires lenders to provide it within three business days of your application. Compare the same loan type (30-year fixed, for example) across all three estimates.

Watch for differences in points. One lender might offer 6.75 percent with no points, while another offers 6.5 percent but charges 1 point (1 percent of the loan amount). On a $300,000 loan, 1 point costs $3,000 upfront. You break even after about five years, so if you plan to stay longer, paying points makes sense. If you might move or refinance sooner, the no-point option is better.

Locking your rate protects you from increases

When you lock your rate, the lender guarantees that rate for a set number of days—typically 30, 45, or 60 days—while your loan processes. If market rates rise during that time, your rate stays locked. If rates fall, you lose the benefit of the drop.

Locking costs money. A 30-day lock is usually free or nearly free. A 60-day lock typically costs 0.125 to 0.25 percent in points. You pay this upfront or it gets rolled into your loan amount. Lock only as long as you need. If your lender says closing will take 35 days, lock for 45 days, not 60.

The decision to lock depends on market conditions and your risk tolerance. If rates are rising, locking early protects you. If rates are falling or stable, waiting a few weeks to lock costs you nothing and might save you money if rates drop further. Your lender can tell you what rates have done over the past week and month, which gives you context for the decision.

Loan term and type affect your rate directly

A 15-year fixed-rate loan typically carries a rate 0.25 to 0.5 percent lower than a 30-year fixed-rate loan, because you are paying back the money faster and the lender's risk is lower. However, your monthly payment is roughly 50 percent higher. On a $300,000 loan at 6.5 percent, a 30-year payment is about $1,896 per month. A 15-year payment at 6.0 percent is about $3,090 per month.

An adjustable-rate mortgage (ARM) starts with a lower rate than a fixed-rate loan, but that rate adjusts after an initial period (typically 3, 5, 7, or 10 years). After adjustment, your payment can rise significantly. ARMs make sense only if you plan to sell or refinance before the rate adjusts, or if you are confident you can absorb a higher payment later.

For most borrowers, a 30-year fixed-rate loan is the safest choice. Your payment never changes, and you know exactly what you owe for the life of the loan.

Market conditions set the baseline, but you still have room to move

Mortgage rates follow the 10-year Treasury yield and move with broader economic conditions. When the Federal Reserve raises interest rates, mortgage rates typically rise. When inflation falls or the economy slows, rates often fall. You cannot control this baseline.

What you can control is where you sit relative to that baseline. Two borrowers applying on the same day might receive different rates because one has a 760 credit score and 25 percent down, while the other has a 680 score and 5 percent down. The first borrower gets the market rate. The second pays a premium on top of it.

This is why improving your credit and saving a down payment before you apply is more powerful than timing the market. You are not trying to predict whether rates will rise or fall. You are positioning yourself to get the best rate available, whatever that rate is.

Frequently Asked Questions

Does paying points always make sense?

No. Paying points (paying money upfront to lower your rate) makes sense only if you plan to keep the loan long enough to break even. On a $300,000 loan, 1 point costs $3,000 and typically saves you 0.25 percent in rate, or about $60 per month. You break even after 50 months (about 4 years). If you might move or refinance sooner, skip the points.

Can I negotiate my mortgage rate?

Not in the traditional sense. Rates are set by the lender based on your credit, down payment, loan type, and market conditions. However, you can shop multiple lenders to find the best rate available to you, and you can ask a lender to match a competitor's offer. Some will; some will not.

What happens to my rate if I apply with a co-borrower?

Your rate is based on the lower of the two credit scores if you both sign the note. If one borrower has a significantly lower score, that pulls the rate up for both of you. Sometimes it makes sense for only the higher-score borrower to apply, though that affects how much you can borrow.

Should I lock my rate immediately?

Not necessarily. Lock only as long as you need to close. If your lender estimates 35 days to closing, a 45-day lock gives you a buffer without paying for extra days you do not need. Ask your lender for a rate lock timeline before you decide.

Does refinancing let me get a better rate later?

Yes, but refinancing costs money in fees and closing costs, typically $2,000 to $5,000. Refinancing makes sense if rates have fallen enough that you break even within a few years. If you plan to stay in the home at least five years and rates drop 0.75 percent or more, refinancing is usually worth exploring.