February 06, 2019 16:02 Updated Follow You can also make extra payments into your post-tax. This means your federal, state and Social Security taxes have already been withheld. Related articles Am I allowed to make voluntary contributions to my PERF plan? How are my taxes affected if my voluntary ASA contributions are all post-tax? What is the employer contribution rate for 2020? How much can I contribute to my PERF account? I have service in another plan. Does that count toward my PERF retirement?