Hi there, @ding2.

The After-tax Roth 401(k) with an annual limit of $23,500 is fixed for IRS compliance. While the annual maximum of $23,500 can't be changed, you can explore a third-party integration to QBO that has this feature.

Browse our QuickBooks Online App Store with many third-party integrations that allows you to enter higher annual limits: QuickBooks App Store.

Make sure to contact the third-party administrator (TPA) of your 401(k) plan. They will guide you on how to properly implement Mega Backdoor Roth and ensure compliance with IRS.

For more details about setting up a retirement plan, please check this article: Set up or change a retirement plan.

After that, consider creating a 401(k) loan repayment payroll item and add it to the employee profile in your QBO Payroll account.

If you have additional questions, feel free to leave a reply below.