May 18, 2020 17:18 Updated Follow If you buy service credit, that added service will increase your monthly defined benefit amount. Read more here. Related articles How much does service credit cost? How do I decide if I want to buy extra service credit? What do these changes with the International Equity Fund mean for me? I’m retiring from my PERF-covered position at the end of the month. My employer has agreed to re-hire me in the same job after 30 days. Is this legal? Can I change my beneficiary and / or benefit option after retiring from PERF?