I already filed before discovering this oversight. How do I get Turbotax to adjust the oversight, or, if the problem was mine, how to I file an adjustment?
It could be due to how you entered your pension in TurboTax. There are some questions in the federal section of your return, after form 1099-R asking where your distribution is from.
Then in the Michigan return, there are additional questions to classify your pension. The questions are to determine what type of pension you have. There are some codes depending on what the source of your pension is. See the codes below:
G - if the pension is from a government or public source
P - if it is from a private source or an IRA
C - if it is a 2024 Roth conversion
N - if it is an other pension subject to Michigan tax (including ALL Section 457 plan distributions)
M - if it is a Military pension
R - if it is a Railroad pension
If you entered the income incorrectly on the return and you already filed, you will need to amend your return. See the following TurboTax help article for more information.