Published:
September 24, 2018
Last updated:
August 20, 2026
How Mortgage Rates Work: A Plain-English Guide for Washington Home Buyers

Key Takeaways

  • Mortgage rates affect both monthly payments and total loan cost, but taxes and insurance also shape the full payment.
  • Rates vary by market conditions, credit score, down payment or equity, loan type, occupancy, and fee structure.
  • APR reflects the interest rate plus certain loan costs, so comparing both rate and APR gives a clearer view of total cost.
  • Paying discount points can lower your rate, and adjustable-rate mortgages may offer lower initial rates than fixed loans.
In This Article

A mortgage rate is the interest charged on a home loan, and it directly affects both your monthly payment and the total amount you pay over time. But the rate itself is only part of the story. Washington home buyers and homeowners can see different pricing based on market conditions, loan details, and borrower qualifications. In this guide, we’ll explain how mortgage rates work, what affects them, and how to compare your options when buying or refinancing.

5 Things to Know About Mortgage Rates

A small book could be written about mortgage rates and how they work. It’s a fairly complex topic. But from a borrower’s perspective, there are just a few important concepts to grasp. And we’ve boiled it down for you in this little mortgage rate guide. Here are five things you should know about mortgage rates in Washington.

1. Rates can vary from one loan to the next.

Mortgage rates do not move for just one reason. Some factors affect the broader rate environment for everyone, while others affect the specific rate offered to you.

At a broad level, mortgage pricing changes with overall market conditions. That’s why the rates reported in the news can rise or fall over time.

At the individual loan level, pricing can also vary based on borrower and loan characteristics. Common examples include credit profile, down payment or home equity, loan type, property occupancy, and how fees are structured. So two borrowers applying around the same time could still receive different offers.

We’ve covered some of those influencing factors below (and in this related article). For now, just realize that the actual interest rate applied to a certain home loan might be higher or lower than the “averages” reported in the news.

2. The rate is one of several parts of the monthly payment.

Mortgage rates are one of the four primary factors that make up the typical monthly payment on a home loan. The other three are the principal, taxes and insurance. Collectively, these four factors are referred to as PITI.

This is something to keep in mind when shopping for a home loan in Washington. Mortgage rates are one of the costs involved, but there other others as well. If you use a basic mortgage calculator to determine what your monthly payments would be for a certain loan size, you might not be seeing the full picture.

Mortgage Rate vs. APR: What’s the Difference?

The mortgage rate tells you the interest charged on the loan balance. The APR, or annual percentage rate, is a broader measure that can reflect the rate plus certain loan costs and fees.

That’s why two loans with similar interest rates can have different APRs. When you compare offers, looking at both numbers can give you a clearer picture of overall cost. Advertised rates can also be misleading if you don’t look at the fees, credits, or points tied to them.

View WA State Mortgage Rates

3. Higher credit scores can bring lower rates.

There’s a difference between average credit scores in Washington, and the actual rates assigned to individual home loans. Credit scores are one of the reasons why borrowing costs can vary from one home buyer or homeowner to the next.

Generally speaking, a higher score could help you qualify for a lower rate on your mortgage loan.

Consumer credit scores are based on current and past financial activity, primarily credit cards and loans. Borrowers who make their debt payments on time tend to have higher scores, while those who experience delinquencies tend to have lower numbers. A lower number indicates a higher level of risk, and could therefore bring on a higher mortgage rate. And the opposite is true for those with higher scores.

4. You might be able to get a lower rate by paying “points.”

We’ve written about the points strategy for getting a lower rate in a separate article. Here’s a quick recap of that tutorial:

Mortgage shoppers in Washington State often choose to pay points in exchange for a lower rate. In this context, one “point” is equal to one percent of the loan amount. This financing strategy is a trade-off. You’re paying a bit more money up front (at closing) in exchange for a lower mortgage rate.

Depending on how long you stay in the home and keep the loan, you could potentially save a lot of money over the long term.

How to Decide if Paying Points Makes Sense

A practical way to evaluate points is to think about break-even timing. In simple terms, how long will it take for the monthly savings from a lower rate to make up for the extra money you paid at closing?

You should also consider how long you expect to keep the home or loan, how much cash you want to bring to closing, and whether you might refinance or move before the break-even point. If you expect to keep the loan for a long time, paying points could make more sense. If not, keeping more cash up front might be the better trade-off.

5. Consider both fixed and adjustable-rate mortgage loans.

An adjustable (ARM) loan might be a good option in some scenarios, because they generally offer lower mortgage rates for the first few years. Most borrowers in Washington State, however, choose the long-term stability of the 30-year fixed mortgage.

For buyers who plan to remain in a house for many years, the fixed-rate mortgage is usually the best option. But an ARM might be better if you think you’ll only be in the home for a few years. Please contact us if you’d like to learn more about your financing options.

When Should You Lock a Mortgage Rate?

A rate lock is an agreement that helps protect a quoted mortgage rate for a set period of time while your loan moves through the process. Timing matters because rates can change between preapproval, house hunting, contract, and closing.

Once you are far enough along to move forward with a loan, ask about the available lock period and what happens if your closing timeline changes. It can also help to ask whether relock, extension, or float-down options are available, if needed.

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Have Questions About Mortgages?

Sammamish Mortgage can help. We serve clients across Washington, Idaho, Colorado, Oregon, and California. Since 1992, we’ve been providing several mortgage programs and products with flexible qualification criteria to borrowers across the Pacific Northwest. Visit our website to get an instant rate quote or to use our online mortgage calculator. Or, reach out to us if you are ready to get pre-approved for a mortgage.

FAQs

What is a mortgage rate?

A mortgage rate is the interest charged on a home loan. It affects both your monthly payment and the total amount you pay over time.

Why is the rate I was quoted different from the rate I saw advertised online?

Advertised rates are often based on broad market conditions and specific assumptions. Your actual rate can differ based on your credit profile, down payment or home equity, loan type, property occupancy, and how fees are structured.

What is the difference between a mortgage rate and APR?

The mortgage rate is the interest charged on the loan balance. APR is a broader measure that can reflect the rate plus certain loan costs and fees, so two loans with similar rates can still have different APRs.

How much can a higher mortgage rate change my monthly payment?

A higher mortgage rate usually increases the interest portion of your monthly payment, which can raise the total amount you pay each month and over the life of the loan. The exact impact depends on the loan amount, term, and other parts of the payment such as taxes and insurance.

What makes up a typical mortgage payment besides the interest rate?

A typical mortgage payment is often described as PITI: principal, interest, taxes, and insurance. The rate affects the interest portion, but the full monthly cost also includes the other three parts.

Can a higher credit score help me get a lower mortgage rate?

Generally, yes. Higher credit scores can help borrowers qualify for lower rates, while lower scores can lead to higher borrowing costs because they may indicate more risk to the lender.

Should I pay points to lower my mortgage rate?

Paying points can make sense if the lower rate produces enough monthly savings to offset the added upfront cost over time. It often depends on how long you expect to keep the home or loan, how much cash you want to bring to closing, and whether you might move or refinance before the break-even point.

When should I lock my mortgage rate?

A rate lock can help protect a quoted rate for a set period while your loan moves toward closing. Once you are far enough along to move forward with the loan, it is smart to ask about available lock periods and what happens if your closing timeline changes.

Is a fixed-rate or adjustable-rate mortgage better for my situation in Washington?

It depends on how long you expect to keep the home and your comfort with payment changes. Many borrowers in Washington choose a 30-year fixed loan for long-term stability, while an ARM may be worth considering if you expect to move or refinance within a few years.

How should Washington borrowers compare mortgage offers?

Compare more than just the interest rate. Look at the APR, fees, credits, points, loan type, and whether the payment fits your budget when taxes and insurance are included.