12.7.3 Taking account of previous MRCA PI lump sums or periodic payments
When a previous MRCA PI lump sum has been paid, the additional amount of PI payable is calculated by converting the lump sum paid to an equivalent weekly amount and subtracting this from the total weekly amount of PI payable at Step 4 or 7 of GARP M, whichever is applicable. When converting the lump sum to an equivalent weekly amount, the delegate is essentially finding the indexed weekly amount the veteran would be receiving now, if they had not converted their payment to a lump sum.