For subsection 148(4) of the Code, the proportionate rebate of premium is calculated using the formula:
where:
"P" is the amount of the premium paid (not including any amount payable in respect of a government charge).
"S" is the number of whole months in the unexpired portion of the period for which insurance was agreed to be provided.
"T" is the number of whole months for which insurance was agreed to be provided.