12 CFR § 1024.34 - Timely escrow payments and treatment of escrow account balances.
(a) Timely escrow disbursements required. If the terms of a mortgage loan require the borrower to make payments to the servicer of the mortgage loan for deposit into an escrow account to pay taxes, insurance premiums, and other charges for the mortgaged property, the servicer shall make payments from the escrow account in a timely manner, that is, on or before the deadline to avoid a penalty, as governed by the requirements in § 1024.17(k).
(b) Refund of escrow balance -
(1) In general. Except as provided in paragraph (b)(2) of this section, within 20 days (excluding legal public holi days, Satur days, and Sun days) of a borrower's payment of a mortgage loan in full, a servicer shall return to the borrower any amounts remaining in an escrow account that is within the servicer's control.
(2) Servicer may credit funds to a new escrow account. Notwithstanding paragraph (b)(1) of this section, if the borrower agrees, a servicer may credit any amounts remaining in an escrow account that is within the servicer's control to an escrow account for a new mortgage loan as of the date of the settlement of the new mortgage loan if the new mortgage loan is provided to the borrower by a lender that:
(ii) Is the owner or assignee of the prior mortgage loan; or