1.148-7 (i)(2) Earnings on a reasonably required reserve or replacement fund.

Earnings on any reasonably required reserve or replacement fund are available construction proceeds only to the extent that those earnings accrue before the earlier of the date construction is substantially completed or the date that is 2 years after the issue date. An issuer may elect on or before the issue date to exclude from available construction proceeds the earnings on such a fund. If the election is made, the rebate requirement applies to the excluded amounts from the issue date.