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It would take a drastic series of circumstances, aggressive rate buydowns, particularly from new home builders — or finding an assumable mortgage. In 2021, the average 30-year mortgage rate fell below 3%. Now, according to Freddie Mac, it's over 7%.

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In 2020 and 2021, Americans witnessed record-low mortgage rates. The lowest 30-year fixed rate was 2.65% in January 2021, but rates hovered at or below 3% for a couple of years. However, home loan rates are unlikely to drop back down to 3% anytime soon.

To understand why, consider two key factors: the circumstances that initially drove the drastic drop in interest rates and the factors that are currently determining today's higher rates.

Read about the mortgage rate predictions for the next five years.

Home loan interest rates reached historic lows in 2021 as the Federal Reserve aggressively cut rates to mitigate the economic effects of the COVID-19 pandemic.

The pandemic impacted the economy in several ways, including widespread unemployment and supply shortages. To encourage spending and avoid a major recession, the Fed began lowering the federal funds rate in March 2020, making it cheaper to borrow money as Americans faced job losses.

Although many factors influence home loan rates, mortgage rates typically follow the general direction of the federal funds rate. By late December 2020, the average rate for a 30-year mortgage was even lower than 3%, at 2.66%.

Learn how the Federal Reserve rate decision affects mortgage rates.

Lower interest rates and pandemic-relief stimulus programs increased consumer demand, one of several factors that drove higher inflation.

The Federal Reserve monitors this rate, which measures changes in the prices of goods and services, and aims to keep it around 2% based on yearly changes in the personal consumption expenditures (PCE) price index.

By 2022, the PCE inflation rate was over 5%, and the Fed began a series of fed funds rate hikes to curb it. The central bank raised its rate 11 times in 2022 and 2023. Mortgage rates followed suit, peaking at 7.79% in October 2023 before hovering around 6.6% at year-end.

Many experts expect 30-year mortgage rates to remain above 7% in 2027. Here are two reasons why.

Inflation: Higher inflation can push mortgage rates up as the Federal Reserve raises the benchmark interest rate to tame rising consumer prices.

10-year Treasury yield: Mortgage rates tend to follow the direction of the 10-year Treasury yield. Unlike the fed funds rate, the 10-year yield is a greater indicator of rates on longer-term loans — like home loans. Recently, Treasury yields have been at multi-year highs.

Keep reading: When will mortgage rates go back down to 4%?

While a conventional mortgage at 3% isn't possible today, there are pathways to a well-below-market mortgage rate.

There are assumable government mortgages held by current homeowners with rates near 3%. If they decide to sell, you may be able to take over their loan and the low rate, if the lender approves. These assumable loans are generally backed by the VA, the FHA, or the USDA.

Assuming a mortgage isn't easy. You have to:

Find a seller with an assumable mortgage.

Pay the seller the equity they have in the house (the equity gap) in cash from your personal savings or by securing a secondary loan.

Be approved by the current lender servicing the loan to assume the balance due.

Another way to achieve a home loan rate below today's prevailing 7% is to use a rate buydown. These discounted mortgage rates are most often offered by new home construction builders through their affiliated lenders.

Usually, the discounts are spread over three years, with the largest discount in year one, a notch higher in year two, and yet another bump up in year three. An example:

The 3-2-1 buydown reduces your rate by three points in the first year, then two, and finally a one-point discount in the third year. With current rates near 7%, that would mean an initial loan rate of 4%, then 5%, and finally 6%. In the fourth year, your mortgage would reset to a permanent fixed rate of 7%.

In addition to new home builders, some retail mortgage lenders may offer a one- or two-year buydown. And home sellers are increasingly offering concessions to buyers to compensate for a growing number of buyer's markets.

You can also buy discount points, essentially prepaid interest, to buy down your interest rate with a lender. Typically, $1000 gets you a 0.25% rate break.

In today's world, without snagging an assumable loan or a drastic buydown, you won't get a 3% home loan. But you can't keep your homebuying plans on hold forever. You can take steps to secure the lowest mortgage rate possible.

Boost your credit score: A higher credit score makes you more likely to get a lower interest rate. Improve your score by paying your credit cards and other debts on time and resolving errors on your report.

Pay down debt: Reducing your debt lowers your debt-to-income (DTI) ratio, a factor mortgage lenders consider when determining your loan eligibility and the rate you qualify for.

Compare multiple lenders: Get preapproval from more than one mortgage lender to compare interest rates, repayment terms, and discounts.

Negotiate fees: Pay attention to closing…