If you miss a payment, the servicer can usually charge a late fee after the grace period expires. Most mortgage loans give a grace period of ten to fifteen days, for example, before you'll incur late charges. To find out the grace period in your situation and the amount of the late fee, review the promissory note or your monthly billing statement.

If you miss a few mortgage payments, the servicer will probably send letters and call you to try to collect. Federal mortgage servicing laws require the servicer to contact you (or attempt to contact you) by phone to discuss foreclosure alternatives—called "loss mitigation" options—no later than 36 days after a missed payment and again within 36 days after each following missed payment. No more than 45 days after a missed payment, the servicer must let you know in writing about loss mitigation options that could be available, and assign personnel to help you. Some exceptions to a few of these requirements exist, like if you file for bankruptcy or tell the servicer not to contact you under the Fair Debt Collection Practices Act. (12 C.F.R. § 1024.39).