October 23, 2019 16:11 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 DC contributions are all post-tax? How much can I contribute to my PERF account? Where do I find employer forms? What are my options for my Defined Contribution Account at retirement?