Lenders will often guarantee an interest rate to you as much as 120 days before your mortgage matures. And, as long as you are not increasing your mortgage, some will cover the costs of transferring your mortgage too.
This means a rate promised well in advance of your maturity date, thus eliminating any worries of higher rates. And if rates drop before the actual maturity rate, the new lender will usually adjust your interest rate lower as well.
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