Is the maximized contribution to a ROTH individual 401k the same amount as what the maximized contribution to a regular 401k would have been?
Yes, but with regard to the employer contribution, it's not as simple as reporting it as a Roth contribution inTurboTax.
The change that the SECURE 2.0 Act made is that it is now possible for employer contributions to be a Roth contribution, but that's only if the plan permits, and apparently needs to be reported as a regular deductible employer contribution followed by an In-plan Roth Rollover with the IRR reportable on the tax return for the year in which the deposit is made. The employer (you as self-employed) be required to generate the (2024 in this case) Form 1099-R required to report the IRR. You'll want to discuss with your 401(k) trustee how to make Roth employer contributions if that's what you plan to do.
Yes, you can use the Maximize function to determine the permissible employee and employer contributions.
