(a) The mortgagor must pay to the mortgagee, upon execution of the mortgage, a sum that will be sufficient to pay the ground rents, if any, the estimated taxes, special assessments, flood insurance premiums, if required, and fire and other hazard insurance premiums for the period beginning on the last date on which each such charge would have been paid under the normal lending practices of the lender and local custom (if each such date constitutes prudent lending practice), and ending on the due date of the first full installment payment under the mortgage, plus an amount sufficient to pay the mortgage insurance premium from the date of closing the loan to the date of the first monthly payment under the mortgage or, where applicable, the one-time mortgage insurance premium payable pursuant to § 203.280.

(b) The mortgagee may also collect from the mortgagor a sum not exceeding one-sixth of the estimated total amount of such taxes, special assessments, insurance premiums and other charges to be paid during the ensuing 12-month period.