ThomasM125: thanks for your answer.
I called the Maryland Comptroller's office number that you gave as [phone number removed], but that number turns out to be dedicated to their "Refund Information Line", so no good for me.
I instead called the main Maryland Comptroller's office number, 800-MDTAXES, and was able to reach a human within 1-2 minutes. That is about the first time anyone in Maryland government has picked up the phone for me in over a year...
Unfortunately, the lady that I spoke with had no idea if my Maryland Unemployment benefits collected once I moved to Florida can be treated as non-Maryland income. That lady referred me to the 2020 version of Form 502LU, which she said had more information. I see nothing in that form regarding part year residents like myself.
I am going to go ahead and leave that portion of Maryland UI benefits collected once I moved to Florida as non-Maryland income, unless someone points me out to a definitive answer otherwise, since we are treating my wife's income earned from her Maryland employer as non-Maryland income now that she is working remotely.
For the benefit of anyone else reading this, I note that if you do not earn too much, Maryland for 2020 will not tax you at all for your UI (source of quote below:(
Unemployment Compensation Tax Break
For the 2020 tax year, individuals who received unemployment income can subtract the benefits from Maryland taxable income. The subtraction is allowed for individuals whose federal adjusted gross income is $75,000 or less, or for married taxpayers and head of household whose federal adjusted gross income is $100,000 or less. This applies to Maryland unemployment benefits and states with which Maryland has a reciprocal tax agreement.
