The pension MBR factor is the percentage increase in the 'not a member of a couple' service pension maximum basic rate. It is used for the [glossary:indexation:433] of some payments, limits and thresholds. The factor is calculated each time the rate of service pension is indexed and is equal to the new 'not a member of a couple' MBR divided by the previous 'not a member of a couple' MBR.