Mandatory retirement, to be treated as a child support consideration, must be mandatory. If you are able to discontinue the withdrawals, then it is not mandatory and you will not receive credit. Typical examples of mandatory retirement accounts are CalSTRs and PERS for parents that are either teachers, law enforcement or other types of government employment. Employer sponsored 401ks are not mandatory as you have the option to either participate or not. Mandatory retirement deductions decrease your gross income which has the same effect as both union dues and health care. However, parents who have mandatory retirement taken out of their monthly wage typically do not have deductions for either Social Security or FICA (Federal Insurance Contribution Act). This requires a change in the Dissomaster or X-Spouse settings to account for not having these deductions.