It depends. Pension plans use different rules to figure out the value of their members' benefits. We will calculate the cost of bringing the service you earned in the other plan over to PSPP. Then we will send you a package with the details before you decide whether or not you want to proceed.
All pension plans are priced differently, so the benefit you earned in your previous plan might not match the cost of buying the same amount of service in PSPP. If the amount available for transfer from your previous plan is at least as much as the amount required by PSPP to credit your previous plan service, you will not have to make any additional payment and all of your previous service will be credited under PSPP.
On the other hand, if the amount required by PSPP to credit your previous plan service is greater than the amount available for transfer, this will result in a shortfall. You will be credited with a proportionate amount of the service you had originally earned, and you will have the option of buying back the difference. Paying for this shortfall means that you can retire earlier with a larger PSPP pension than if you did not buy the service.