Changing the setup of your simple 401k to simple 401k catch-up needs assistance with our Customer Support Team. They can do payroll correction in case you have existing paychecks of your employee that need to change.
Simple 401k catch-up contributions will normally apply to those employees who are age 50 or over at the end of the calendar year and this will apply for future paychecks.
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I'm adding these articles that will guide you with retirement contributions in QuickBooks: