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The Fed didn't make a move at the March meeting, but what the Fed had to say about future policy has implications for mortgage rates.

The Fed didn't make a move at the March meeting, but what the Fed had to say about future policy has implications for mortgage rates.

How are mortgage interest rates determined?

Keith Gumbinger

Mortgage rates fluctuate from day to day, depending on a number of factors related to the economy and to choices made by investors. While some mortgage money comes from deposits held by banks and credit unions, most of the funds for borrowers come from investors in capital markets.

If you are watching mortgage rates so you can lock in a loan at the best time, you will notice that rates tick up and down regularly. Here are a few of the factors that regularly influence mortgage rates:

  • Investor demand. While borrowers are interested in keeping mortgage rates as low as possible, investors prefer high rates so they can get a better return on their investments. But demand depends a lot on other available investment returns and the risk involved with those investments. When investor interest is low, brokerages and banks must increase yields (rates) in order to attract investors to buy these loans and securities.

  • Treasury bonds. Mortgage rates, while not specifically tied to Treasury bond yields, over the long term usually move in the same direction as these yields, with fixed-rate mortgages often tracking the 10-year Treasury bond. Because they are not guaranteed and carry additional risk, rates on mortgages must be a little higher than Treasury bonds to compensate investors.

  • Volume. Sometimes a rush of applications for purchases or refinances will mean there are more mortgages available for investors to buy. An oversupply generally means that mortgage brokerages and bankers will need to raise mortgage rates a little to increase investor interest in buying these investments.

  • Inflation. Rising inflation reduces the actual return on a fixed-interest-rate investment, so when higher inflation is expected, mortgage rates will also often rise. Thankfully, the reverse is also true.

  • Federal Reserve. Many people assume that when the Federal Reserve changes the target rate for the federal funds rate -- the interest rate banks charge each other for overnight loans -- mortgage rates will change. In truth, the federal funds rate is adjusted according to economic activity and inflation, and mortgage rates will not always be impacted. Sometimes, in fact, the federal funds rate will be lowered in order to stimulate the economy and mortgage rates will actually rise in anticipation of stronger economic growth and possibly higher inflation.

  • Your finances. One important component of the mortgage rate you'll pay is determined by you, the borrower. Your credit profile, asset strength, debt load, loan choices and other factors all figure into risk-based pricing, where your individual financial strengths and weaknesses tune the final package of rates and fees you'll pay to get a mortgage. The fewer risks you present to a lender, the lower your rates and fees will be.

  • As you can see, mortgage rate movements are determined by a variety of factors that are not necessarily controlled directly by your mortgage lender. However, lenders can help you by anticipating potential changes in mortgage rates, and locking in your rate when it's most favorable to do so, for example.

    In the setting of mortgage rates, there are a lot of potentially complicated intersections and economic relationships involved, and you can learn about them in "What moves mortgage rates? The Basics".

Ask the expert
Keith Gumbinger
Keith Gumbinger
Mortgage Expert
Vice President, HSH.com
About Keith: Mortgage market observer and analyst with 35 years experience... (more)
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