(a) Interest subject to refund. Precomputed interest in Texas Finance Code, Chapter 342, Subchapter E and G loans is subject to refund.(b) Interest or fees not subject to refund.(1) Administrative fees. Administrative fees authorized by Texas Finance Code, §342.201(f) and §342.308(c) are not subject to refund.(2) Per diem interest. Per diem interest on odd days in the first installment period is not subject to being refunded if the per diem interest for the first installment period has been earned and collected during the first installment period.(3) Refunds less than $1. Refunds of unearned interest are not required when a partial prepayment is made or when the sum of interest to be refunded is less than $1.