(a) General. Electronic payment methods for Federal tax payments available under this subpart include ACH debit entries, ACH credit entries, and same-day payments.

(b) Conditions to making an electronic payment. This part does not affect the authority of financial institutions to enter into contracts with their customers regarding the terms and conditions for processing payments, as long as the terms and conditions of those contracts are not inconsistent with this part and with any laws that apply to the particular transactions.

(c) Payment of interest for time value of funds held. Treasury will not pay interest on any payment that a financial institution erroneously originates and that subsequently is refunded.