How Mortgage Interest Rates Work

Your mortgage rate is the single biggest driver of what your home costs over the life of the loan, and most people never stop to understand how it is actually set. A $400,000 loan at 6.5% costs about $510,000 in interest over 30 years; the same loan at 5.5% costs about $418,000. One percentage point is nearly $100,000. That is a down payment on another home, a college fund, or a decade of retirement. Understanding what moves rates, why your rate differs from the advertised one, and how to get the lowest possible number is worth more than almost any other financial skill.

What actually moves rates

The most common misconception is that the Federal Reserve sets mortgage rates. It does not. The Fed controls the short-term federal funds rate, which influences credit cards, auto loans and home equity lines. Fixed mortgage rates track something else: the 10-year Treasury yield, plus a spread.

Here is how the chain works. Investors who want a safe long-term return buy 10-year Treasury bonds. Their yield is set by the bond market every day, based on expectations for inflation, economic growth and future Fed policy. Mortgage-backed securities — the things lenders bundle and sell after you take out a loan — compete with Treasuries for the same investors. When Treasury yields rise, mortgage rates rise to stay attractive. When inflation expectations fall and the economy slows, Treasury yields drop and mortgage rates follow.

This is why rates move daily, sometimes sharply, even when the Fed does nothing. A jobs report, an inflation print, or a shift in the bond market can move the average rate by an eighth of a point in a morning. The Fed matters indirectly — its rate decisions and its bond-buying programs shape the whole yield curve — but the number on your loan comes from the bond market, not a Fed announcement.

Why your rate differs from the advertised one

The published national average is a starting point, not your number. Your personal rate is set by how risky the lender thinks you are, and that risk is priced through five main factors.

First is your credit score. Second is your down payment and loan-to-value ratio — more equity means less risk. Third is your loan type: government-backed loans can price differently from conventional ones. Fourth is your debt-to-income ratio, which measures how much of your income already goes to debt. Fifth is the loan size and whether it is a conforming or jumbo loan. A buyer with a 760 score and 20% down gets the advertised rate; a buyer with a 660 score and 3% down pays a meaningful premium, because the lender is taking on more risk and expects to be paid for it.

The credit score effect, quantified

Credit score is the biggest personal factor you control, and the cost of a lower score compounds over three decades.

Those numbers explain why fixing your credit before you buy is the highest-return investment available. Raising a score from 680 to 760 before applying can save more money than any negotiation on the home price itself. We break down exactly how in our credit guide.

Fixed vs adjustable: choosing your risk

A fixed-rate mortgage locks your rate for the entire life of the loan. Your principal and interest payment never changes, which makes budgeting simple and predictable. The tradeoff is that fixed rates are usually a little higher than the introductory rate on an adjustable-rate mortgage, because you are paying for that certainty.

An adjustable-rate mortgage (ARM) starts with a lower rate fixed for an initial period — commonly 5, 7 or 10 years — and then adjusts annually based on a market index plus a margin, subject to caps on how much it can move. ARMs are cheaper up front and can be a good deal if you are confident you will sell or refinance before the first adjustment. They are a risk if you stay past it and rates have risen, because your payment can jump.

The right choice depends on your timeline. If you expect to be in the home for a decade or more, the predictability of a fixed rate is worth the small premium. If you are buying a starter home you plan to sell in five years, an ARM's lower early rate can save thousands. The key is being honest about how long you will actually stay.

Points: trading cash now for a lower rate

Mortgage points, also called discount points, let you buy your rate down at closing. One point costs 1% of the loan amount and typically cuts the rate by about 0.25%. On a $400,000 loan, one point costs $4,000 and reduces your monthly payment by roughly $66.

Whether points make sense is a break-even calculation. If you spend $4,000 to save $66 a month, you break even in about 61 months — just over five years. Stay longer than that and you come out ahead; sell or refinance sooner and you wasted the money. The general rule is that points pay off for buyers who plan to stay in the home long-term and do not expect to refinance soon. In a falling-rate environment, they are often a bad bet, because you would be better off keeping the cash and refinancing later.

How to get the lowest rate

Getting the best rate is a process, not a wish. Start six to twelve months out by raising your credit score above 760 and saving toward a 20% down payment, since both lower your risk profile. When you are ready to apply, shop at least three lenders — a bank, a credit union and a mortgage broker — and get a Loan Estimate from each.

Apply within a short window, ideally the same day or week, because multiple mortgage inquiries within a 14- to 45-day window are grouped as a single inquiry for credit-scoring purposes. Compare the full Loan Estimate, not just the headline rate: origination fees, points and lender credits differ as much as the rate itself, and a lower rate with high fees is not a better deal.

Finally, lock your rate once you find one you are happy with. A rate lock freezes the rate for a set period — usually 30 to 60 days — so it cannot rise while your loan is processed. Floating in hopes of a dip can work, but in a volatile market it is a gamble. When you see a rate that fits your budget, lock it and move on.

Frequently asked questions

Does the Federal Reserve set mortgage rates?

No. The Fed sets short-term rates, but fixed mortgage rates track the 10-year Treasury yield plus a spread. Fed policy influences rates indirectly through the bond market.

Why did my rate go up after I was quoted?

Rates move daily with the bond market. A quote is not a guarantee until you lock. Always confirm whether a quoted rate is locked and for how long.

Is it worth paying points to lower my rate?

Only if you plan to stay in the home past the break-even point, typically five or more years. If you might refinance or sell sooner, keep the cash.

What is a good mortgage rate in 2026?

The "good" rate is the best one your credit and down payment qualify you for. A 760+ score with 20% down gets the most competitive pricing. Shop multiple lenders to find it.

See your own rate in action

Rates are abstract until you see them on your own payment. Our mortgage calculator lets you change the rate field and watch the monthly payment and total interest move in real time. Run a few scenarios — the difference a point of rate makes will surprise you, and it will clarify exactly why getting the best rate matters.