The best interest rate depends on what you're saving or borrowing for, and rates change weekly

There is no single "best" interest rate because different financial institutions offer different rates for different products, and those rates shift constantly. A rate that's competitive for a savings account might be terrible for a mortgage. A bank offering 4.5% on a CD might offer 0.01% on a checking account. The institution with the lowest mortgage rate this week may not have it next week.

What matters is finding the rate that works for your specific situation: the type of account or loan you need, how long you're willing to lock money away, your credit score (for loans), and how much you're depositing or borrowing. The process is straightforward—you compare offers from multiple lenders and pick the one that saves you the most money over the life of the product.

Key Takeaways

  • Online banks and credit unions typically offer higher savings rates than traditional brick-and-mortar banks because they have lower overhead costs.
  • Your credit score directly affects the interest rate you'll receive on loans—the higher your score, the lower your rate will be.
  • Rates change daily or weekly, so comparing quotes from at least three lenders on the same day gives you an accurate picture of what's available.
  • The lowest advertised rate isn't always the best deal if it comes with high fees, strict withdrawal rules, or a long lock-in period.

How to compare savings account rates across institutions

Start by checking rates at three categories of institutions: online banks, credit unions, and traditional banks. Online banks (like Marcus, Ally, or Discover) almost always offer higher rates on savings accounts and CDs because they don't maintain physical branches. Credit unions often match or beat online bank rates for members. Traditional banks usually offer the lowest rates but may offer convenience or other services that matter to you.

When you compare, look at the annual percentage yield (APY), not just the interest rate. APY includes compounding, so it's the true number you'll earn. Check whether the rate is fixed or variable—a fixed rate stays the same for the term you choose, while a variable rate can change. For savings accounts, variable rates can drop, which matters if you're planning to keep money there for years. For CDs, the rate is locked in for the term length you choose (three months, one year, five years, etc.), so you know exactly what you'll earn.

Write down the APY, any minimum deposit required, and any fees for early withdrawal or account maintenance. Then rank them by APY. The highest APY wins, unless the fees or restrictions make it impractical for how you plan to use the account.

How credit score affects loan interest rates

For loans—mortgages, auto loans, personal loans, or credit cards—your credit score is the single biggest factor determining your rate. Lenders use your score to predict how likely you are to repay. A score of 750 or higher typically qualifies you for the lowest advertised rates. A score below 650 will result in significantly higher rates, sometimes 3% to 5% higher than the best available rate.

The relationship is direct: each 20-point increase in your credit score can lower your rate by 0.25% to 0.5%, depending on the lender and loan type. On a $300,000 mortgage, a 0.5% difference means roughly $150 per month. On a $10,000 personal loan, it could mean $500 to $1,000 in total interest over the life of the loan.

If your score is below 700, you have two options: wait three to six months while you pay down debt and make on-time payments (which will raise your score), or accept a higher rate now and refinance later when your score improves. Some lenders offer rate-and-term refinancing, which lets you refinance just to get a better rate without borrowing additional money.

Where to find current rates for different loan types

Mortgage rates are published daily by Freddie Mac, Fannie Mae, and the Mortgage Bankers Association. You can see national averages on their websites, but your actual rate depends on your credit score, down payment, loan term (15-year or 30-year), and the specific lender. Get quotes from at least three mortgage lenders on the same day to compare. Each lender will pull your credit once, which counts as a single inquiry if done within 14 days.

Auto loan rates are available from banks, credit unions, and online lenders like LendingClub or Upstart. Credit unions often have the lowest rates for members. Get pre-approved before you go to the dealership—this tells you the rate you may have access to for and prevents the dealer from marking up the rate.

Personal loan rates vary widely based on credit score and loan amount. LendingClub, Prosper, SoFi, and traditional banks all publish their rate ranges. The lowest rates go to borrowers with excellent credit; if your score is below 700, expect rates between 10% and 36%.

Credit card rates are set by the card issuer and depend on your creditworthiness. You can see the range of APRs a card offers before you explore (for example, "16.99% to 24.99%"), but you won't know your exact rate until after approval. Cards with no annual fee and lower APRs are available to people with scores above 700.

Why the lowest rate isn't always the best deal

A lender advertising the lowest rate may charge origination fees, process fees, or prepayment penalties that eat into your savings. On a mortgage, an origination fee of 1% means you're paying $3,000 upfront on a $300,000 loan. On a personal loan, a 5% origination fee reduces the amount you actually receive.

For savings accounts, the lowest-rate account might have a minimum deposit of $25,000 or restrict how many times you can withdraw per month. A CD with the highest rate might lock your money away for five years, which is a problem if you need access sooner. Read the terms carefully before you commit.

Calculate the total cost or total earnings over the full term, including fees. A loan with a 0.25% higher rate but no origination fee might cost you less overall than one with a lower rate and a $500 fee. A savings account with a 4.5% APY and a $25,000 minimum might earn you less total interest than a 4.3% account if you only have $10,000 to deposit.

How to lock in a rate before it changes

For mortgages, once you receive a loan estimate from a lender, you can lock in the rate for a set period—typically 30, 45, or 60 days. The lock prevents your rate from changing if market rates rise during that time, but it also means you can't benefit if rates fall. Some lenders offer a "float down" option that lets you lock in a lower rate if rates drop before closing, though this usually costs extra.

For other loans, rates are typically locked once you're approved and the loan is funded. For savings accounts and CDs, the rate is locked in for the term you choose (or indefinitely for savings accounts, though the bank can change the rate with notice). There's no way to "lock in" a savings rate before opening the account—you get whatever rate is offered on the day you open it.

If you're shopping for a loan, get all your quotes within a two-week window so you're comparing rates from the same time period. Rates can shift 0.25% to 0.5% in a single week depending on market conditions.

Frequently Asked Questions

Can I get a better rate if I have a relationship with a bank?

Sometimes. Some banks offer slightly better rates to customers who have a checking account or direct deposit with them, but the difference is usually small—0.1% to 0.25%. It's rarely worth staying with a bank that offers poor rates just for this benefit. Compare the actual rates you're offered, not the relationship.

What's the difference between APR and APY?

APR (annual percentage rate) is the interest rate without compounding. APY (annual percentage yield) includes the effect of compounding—interest earned on interest. For savings accounts, APY is always higher than APR and is the number you should use to compare. For loans, APR is what matters because it includes fees and shows the true cost of borrowing.

Do I have to accept the first rate I'm offered?

For loans, you can shop around and compare offers from multiple lenders before accepting any of them. For savings accounts, you accept the rate the bank is offering on that day—you can't negotiate. If you don't like the rate, open the account elsewhere.

How often do interest rates change?

Savings account and CD rates change weekly or even daily, depending on the institution and market conditions. Mortgage rates change daily. Auto loan and personal loan rates change based on market conditions and your creditworthiness. Credit card APRs can change with 15 days' notice from the issuer.

Will shopping for rates hurt my credit score?

Multiple inquiries for the same type of loan (mortgage, auto, or personal) within 14 to 45 days count as a single inquiry and have minimal impact on your score. Shopping for savings accounts or credit cards doesn't hurt your score at all because those inquiries are soft pulls, not hard pulls.