(a) Circumstances subject to interest assessments. Treasury may assess interest on a financial institution in instances where a taxpayer that failed to meet a tax due date proves to the IRS that the delivery of Federal tax payment instructions to the financial institution was timely and that the taxpayer satisfied the conditions imposed by the financial institution pursuant to § 203.10(b). Treasury also may assess interest where a financial institution fails to respond to an ACH prenotification entry on an ACH debit as required under part 210 of this title, or fails to originate an ACH prenotification or zero dollar entry on an ACH credit at a taxpayer's request, which then results in a late payment.

(b) Calculation of interest assessment. Any interest assessed under this section will be at the TT&L rate of interest. Treasury will assess the interest from the day the taxpayer specified that its payment should settle to the Treasury until the day Treasury receives the payment, subject to the following limitations: for ACH debit transactions, interest will be limited to no more than seven calendar days; For ACH credit and same-day transactions, interest will be limited to no more than 45 calendar days. The limitation of liability in this paragraph does not apply to any interest assessment in which there is an indication of fraud, the presentation of a false claim, or misrepresentation or embezzlement on the part of the financial institution or any employee or agent of the financial institution.

(c) Authorization to assess interest. A financial institution that processes Federal tax payments made electronically under this subpart is deemed to authorize the TSC to debit its reserve account for any interest assessed under this section. Upon the direction of Treasury, the TSC will debit the financial institution's reserve account for the amount of the assessed interest.

(d) Circumstances not resulting in the assessment of interest.