BUYING A HOME
When to Lock in a Mortgage Rate? - Zillow
4 Things Home Buyers Should Know About Rate Locks

A rate lock is a guarantee from a mortgage lender that they will give a mortgage loan applicant a certain interest rate, at a certain price, for a specific time period. The price for a mortgage loan is typically expressed as "points" paid to obtain a specific interest rate. (Points are basically prepaid interest, so the more points you pay, the lower the interest rate; 1 point equals 1 percent of the loan amount.) A rate lock protects the borrower from rising interest rates: So, if the borrower locks in a rate of 4 percent, he will only have to pay 4 percent interest even if rates rise while he's going through the loan application process. Usually, a rate lock is good for 30, 45 or 60 days, though that time period can be shorter or longer; once that period expires, the borrower is no longer guaranteed the locked-in rate unless the lender agrees to extend it.

Here's what you need to know about rate locks:

What happens if the rate goes up or down after you lock in the rate?

If interest rates rise during your lock-in period, you will not be impacted -- you will still pay the lower rate that you locked in. If, however, you lock in a rate but then rates drop, you typically will not be able to take advantage of those lower rates; instead, you'll pay the higher rate that you locked in. There are some exceptions to this: First, if you have a so-called "float down" provision -- which states that if rates drop during the rate lock period, the borrower can take advantage of the lower rates -- in your written rate lock agreement, you should be able to get a loan with the lower interest rate. (But beware -- putting this provision in your agreement can be costly, so you need to think about how big of a risk falling interest rates might be to you). Second, you can rewrite your rate lock so that it reflects the new, lower rate, but this, too, can prove costly.

When should you lock in your rate?

For most people, it makes sense to first sign a purchase agreement on a specific property before trying to lock in a mortgage rate. Then, find a mortgage loan with a good interest rate (do your homework online to look at available rates) and consider asking your lender to (in writing) lock in the rate. But before you formalize the rate lock, consider these things: First, you don't want to lock in the rate too early on, as rate locks are usually only good for between a few weeks to 60 days, so if your loan doesn't process within that period, your rate lock offer will no longer be good. Therefore, you need to make sure that the duration of your lock-in will give the lender enough time to process the loan. To do that, ask the lender to share the average loan processing time and try to get the lender to lock-in your rate for as long as possible to protect yourself.

Should you choose a longer rate lock period?

All things being equal, consumers should choose a longer rate lock period (these usually range from a few weeks to 60 days) to ensure they can get the agreed upon rate even if there are delays in processing the loan. But there's a catch: Sometimes if you pick a rate lock with a longer duration (say 90 days) the interest rate won't be as good as with a shorter duration rate lock period, or the lender may charge a fee for this longer duration. Normally if a loan fails to close within its lock period, the borrower will be charged the "worst case scenario" price for a re-lock (the worst price between the original lock and the current interest rate). Ask your lender to spell out the differences in cost and rates for different duration periods.

Does it cost money to lock in your rate?

Sometimes rate locks cost money and sometimes they don't. The rate lock fee may be a flat fee, a percentage of the total mortgage amount or added into the interest rate you lock in. The fees may be refundable or non-refundable. Typically, short-term rate locks (those less than 60 days) are free or cost roughly up to about 0.25 - 0.50 percent of the total loan, or a few hundred dollars. Lenders typically charge more for longer-term rate locks.

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