Should you lock your mortgage rate today? If your closing date is 30 to 45 days out, the published guidance says yes. A rate lock is the lender's written commitment to hold a specific rate for a set number of days. This month, going without one carries a cost you can see clearly.

Freddie Mac's Primary Mortgage Market Survey put the average 30-year fixed at 7.40% for the week ending October 8, 2026. That was up from 7.28% the week before. It was the seventh straight weekly increase and the highest reading since November 2023.

The alternative to locking is floating, which means leaving your rate unlocked so it moves with the market until you lock it. Floating is a bet that this climb reverses before you close. What follows explains how to tell whether that bet suits your file, and whether paying for a float-down option makes sense.

Three numbers decide lock or float

Lenders reprice off the bond market every day, and sometimes more than once a day. A lock freezes your rate. Floating leaves it moving. A float-down sits between the two. You lock, and if rates fall far enough before closing, you can take the lower rate in exchange for a fee.

Days to closing. MortgageDaily's October 9 rate report calls locking "the conservative choice" if you close within 30 to 45 days. If you are 60 or more days out, it treats floating as a deliberate bet that inflation is cooling.

The buffer matters more than most buyers expect. The Real Cost Report puts the typical purchase loan at 26 days from lock to closing, so a standard 30-day lock leaves about four days to spare. AmeriSave recommends a lock that covers your closing timeline plus 10 to 15 days, which is the same reasoning behind timing the lock to your closing date.

How much room your approval has. Your debt-to-income ratio is the share of gross monthly income that goes to debt payments, including the new mortgage. If it already sits near your lender's limit, a higher rate can push the payment past that limit. The size of the change is easy to underestimate. MortgageDaily calculates that a $400,000 loan costs $2,775 a month in principal and interest at 7.42%, and $2,844 at 7.67%. That is a $69 difference from a quarter point. On a file with room to spare, $69 is a nuisance. On a borderline file, it can mean a new underwriting decision. Only your loan officer can tell you how much of a rate increase your approval can absorb, so ask.

What a float-down costs. AmeriSave puts float-down and repricing fees at 0.25% to 0.50% of the loan amount. It says rates typically have to fall 0.25% to 0.375% before you can use the option. The Real Cost Report cites about 0.25%, or roughly $1,000 on a $400,000 loan. Some lenders allow one reprice at 0.25%, and others charge 0.50% for multiple reprices.

Does a float-down pay for itself?

This is AmeriSave's example on a $400,000 loan. You pay for a float-down, and rates later fall enough for you to use it.

Float-down fee$1,600
Rate improvement captured0.375%
Monthly savingsabout $87
Months to recover the fee ($1,600 / $87)about 18

The fee pays off only if two things happen. Rates must fall past the trigger before you close, and you must keep the loan for more than about 18 months. If rates never drop far enough, the $1,600 is spent and buys nothing. The Real Cost Report estimates a breakeven of about 15 months on a cheaper float-down after a 0.25% improvement.

What the last six weeks looked like

On August 27, 2026, the PMMS 30-year rate was 6.66%. By October 8 it was 7.40%, which is 74 basis points higher in about six weeks. A basis point is one hundredth of a percentage point. WRE News calculated that a $400,000 loan at 7.40% runs about $2,770 a month in principal and interest, compared with about $2,476 at the 6.30% rate of a year earlier.

The daily measures have told a slightly different story, and it helps to know why. On October 8, the same day Freddie Mac printed 7.40%, Mortgage News Daily reported a 0.09% drop in its daily average. That was the fastest one-day decline in three months. By October 9 its top-tier 30-year average was 7.48%, a two-week low.

PMMS averages applications submitted from the prior Thursday through Wednesday, so it trails the daily figures. A dip of a day or two does not show up in it right away.

What comes next is genuinely uncertain. MortgageDaily flags the October 14 CPI inflation report as able to move rates a quarter point in either direction. The October 15 PPI and retail sales reports follow, and the Fed meets on October 28. Mortgage Daily's forecast rates its own confidence in the near-term direction as "low."

If your closing is inside 45 days, locking remains the conservative choice: three dips of a basis point or two do not undo a 68-basis-point climb.

Darryl Linnington
Writer, MortgageDaily.com

A float-down is not a lock, and neither is an extension

Buyers often treat these three as one product. They are three separate purchases. Mortgage Daily's forecast puts it bluntly: a float-down "is a separate feature with its own cost, not a reason to stay unlocked." An extension buys more time on a lock you already have, and its cost adds up per extension.

Rate lock Float-down Lock extension
What it buys A fixed rate for a set period The right to take a lower rate if rates fall past a trigger More days on an existing lock
Typical cost on $400,000 30-day: usually built into the rate; 45-day: $0 to $500 $1,000 to $2,000 (0.25% to 0.50%) $500 to $1,000 per 15 days; most lenders cap it at three extensions
Pays off when Rates rise before closing Rates fall 0.25% to 0.375% or more and you keep the loan long enough Closing slips past the lock date

The five-minute call with your loan officer

  1. Match the lock length to the closing date

    Count the days to your closing and add 10 to 15. Then ask what that length costs compared with a 30-day lock.

  2. Ask for the float-down terms in numbers

    Get three answers: the fee, how far rates must fall to trigger it, and whether you can use it once or more than once.

  3. Run the breakeven

    Divide the fee by the monthly savings the trigger would give you. If you might sell or refinance before that many months, or if the trigger would need a bigger drop than you expect, lock without the float-down.

  4. Get the lock confirmed in writing

    A quoted rate is not a lock. Ask for the written confirmation that shows the lock is actually in effect, along with its expiration date.

  5. If you float, set the trigger now

    This applies only if you are 60 or more days out. Agree on a lock trigger with your lender in advance, and budget for a payment a quarter point higher as a cushion. The bond market is closed on October 12.

Is the rate you are about to lock competitive?

Once you lock, you are committing to a number, so check it first. Freddie Mac's chief economist, Sam Khater, said with the October 8 release that getting multiple quotes "can potentially save them thousands over the loan's lifetime."

Under contract, a competing quote is most useful in two ways. You can use it as leverage with your current lender, or you can act on it if your file is early enough that moving it would not cost days you lack. If switching lenders would push your closing date, the lower rate may not be worth the risk to the deal.