Where an enforcement authority requires a landlord or letting agent to pay an amount under section 10, the authority may require the landlord or letting agent to pay interest on that amount.
If an enforcement authority requires a landlord or letting agent to pay interest on an amount under subsection (1)—
the amount carries interest from the day specified in subsection (3) until the day on which the amount is paid;
the rate of interest is the rate for the time being specified in section 17 of the Judgments Act 1838.
That day is—
where the amount is required to be paid under section 10(2), the day on which the prohibited payment was made;
where the amount is required to be paid under section 10(5), the day on which the payment or (as the case may be) the first of the payments under the contract was made;
where the amount is required to be paid under section 10(8)—
in a case within paragraph 4 of Schedule 2, the day after the end of the period within which the holding deposit is required to be repaid in accordance with that paragraph, or
in a case within paragraph 5 of that Schedule, the day after the end of the relevant period within the meaning of that paragraph.
The total amount of interest imposed under subsection (1) must not exceed the amount required to be paid under section 10.