The 401(k) after-tax Roth Employee Contributions limit for individuals aged 50 and above is $31,000 in QuickBooks Online, ding2.

In alignment with IRS compliance regarding contribution limits, QuickBooks follows the limit of $23,500 for those under 50 years of age and $31,000 for those aged 50 and above.

The after-tax contribution for the Mega Roth Backdoor 401(k) plan enables you to save beyond the $31,000 limit set for after-tax Roth 401(k) contributions. However, please note that QuickBooks Online does not currently support this feature due to compliance with IRS contribution limits.

For potential workarounds, I recommend contacting your accountant to ensure that your W-2 and other end-of-year reports are accurate.

You can refer to the Learn about employee contribution limits section of this article for more information about employee contribution limits: Set up or change a retirement plan.

To obtain the essential information regarding your employees' deductions and contributions, you can generate a payroll reports in QuickBooks Online. For more information, please check this article: Run payroll reports.

Feel free to circle back to this thread so we can guide you once you have more questions about 401(k) after-tax Roth.