You lock a rate on Monday. By Thursday, the market has improved and identical loan terms now carry a lower rate. The instinct is to capture that savings, but the mechanics matter: paying for a contractual float-down option, canceling your lock and re-locking with the same lender, or abandoning the file and switching lenders entirely all produce different outcomes.
Float-down provisions and their fee structures
Some lenders offer a contractual float-down feature, either included at lock or purchasable as an add-on. A typical structure charges 0.125 to 0.25 percent of the loan amount and allows one downward adjustment if rates improve by a specified threshold—often 0.25 or 0.375 percentage points—within the lock window. The fee is non-refundable whether or not you use the option. On a $400,000 loan, a 0.25 percent float-down fee costs $1,000. If the market drops and you exercise the provision, underwriting and the appraisal remain valid; the lender simply re-prices the loan. If rates don't move enough to trigger eligibility, you've paid the fee with no benefit. These figures are illustrative; rates and products are subject to change and this is not a commitment to lend.
Canceling and re-locking with the same lender
Most lock agreements allow cancellation before closing, though the lender is not obligated to offer a new lock or honor previous underwriting decisions. Canceling and re-locking resets the clock: the lender may require updated pay stubs, bank statements, or credit pulls if enough time has passed, and any conditions or waivers previously granted start from zero. The appraisal typically transfers because it was ordered and paid for under the same lender relationship, but confirm this in writing before canceling. You avoid float-down fees, but you introduce re-underwriting risk and push your closing date.
Switching lenders mid-process
Abandoning one lender for another captures the new market rate but forces a full restart. The new lender orders a separate appraisal—appraisals are not portable across institutions—and begins underwriting from scratch. You forfeit the application and appraisal fees paid to the first lender, often $500 to $800 combined. If you are near your purchase-contract closing date or refinance deadline, the delay may cost more than the rate savings. Switching makes financial sense when the rate improvement is significant and you have time to complete a full cycle without jeopardizing the transaction.
The Alliance take: run the math before you move
Compare the dollar cost of each path against the monthly savings the lower rate produces. A 0.25 percent rate reduction on a $400,000 thirty-year fixed loan saves roughly $60 per month. If the float-down fee is $1,000, breakeven occurs after seventeen months. If switching lenders costs $700 in sunk fees and adds three weeks to closing, measure that against the rate benefit and your transaction timeline. Float-downs work best when rates are volatile and you want insurance without re-starting underwriting. Re-locking suits scenarios with ample time and minimal underwriting complexity. Switching is the last resort unless the rate gap is large and the calendar allows it. Start an application to discuss lock strategies that fit your timeline and risk tolerance.