2017 was a positive.

MN return is so convoluted.

But I did get the letter and went in search of the correction. Since I used TurboTax I knew it was not my mistake but was curious.

We itemized our deductions and one could only deduct medical expenses that exceeded 7.5% of AGI. But MN set the bar higher to 10%. So one had to use a few more forms, of course, to add this 2.5%. (The new Federal "tax reform" now also uses the 10% bar).

The corrected form now removed that addition to income, reduced the taxable income and the tax and, in our case, increased the refund.

I do hope that the 2019 forms are not as bad as the 2018 but am doubtful. Yes, I use TurboTax but usually have my spreadsheet filled.

Know just what you are talking about. We ended up using a CPA the last twenty years or so. Outside sales expenses caused a Audit in the mid seventies,after that,enough,take to Mikey,he will figure this think out.

Had a similiar situation in the State of Utah when they gave you a option to either pay 7% of your AGI or 5%. Choose the 7 just in case,later that year the State Legislature changed the List of qualified deductions and made it retroactive back to the filing year. So we received a refund for the 2% difference,something in the 200 dollars neighborhood. Course that all changed two years later when their Legislature gave the Business and Industry a massive break and added SS and your AMD's and Pensions to the Gross Income . And to top that off,it was retroactive to the previous year. That was one ugly check to cut.