MX State ID

Forum|Forum|3 months ago
March 6, 2026
1 reply
11 views

TurboTax 2025 Deluxe offline program accepts proper 1099-INT multi-state ID input to MX and then flags it for correction in the Federal error check review. The totals from eight states are correct and were entered individually with correct state IDs, but TurboTax reset the total form to MX and then wants it corrected. It appears that the two events were not coordinated in the application.

Best answer by SteamTrain

Yes, I'm using 2025 TT Deluxe the license for which I purchased at Costco and downloaded in the Mac version. I'm as confused as you over why TT inserted it. This is why I suspect it may be a bug in the software.

Ahhh....... a MAC. I don't have a clue if the MAC software still uses the MX or not.

You could change an MX to an XX and see what happens.

At one time the software used XX in the actual breakdown table, but used MX (in that last line I showed in the picture above.) to indicate that the table amounts were to be used Just make sure that the $$ in the breakdown table exactly match the $$ in box 8.

RogerD1

Level 6

Are you entering tax exempt municipal bond interest? You should just need to allocate the interest between your resident state(s) and the rest to multiple states. I'm not sure what you mean by setting the multi state ID to MX - did you mean multiple states?

If you could reply back with additional details about whether this is municipal bond interest and to what is meant by MX plus any other relevant information about this situation, that will help us to better help you.

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EdiepieAuthor

Level 2

Roger, thank you for asking for more info.

Yes, I entered 8 different states that posted interest payments on munies in 2025, each using their specific State digraph. When TT checked for errors after all income and deduction data was completed using Deluxe prior to filing, TT flagged the compiled 1099-INT as having the erroneous MX State code. It was not I who had entered MX; TT did that.

At this point, I am left with three options and don't know which one is best for IRS purposes:

a. Accept the MX TT gave me, ignore it, and file;

b. Go into the form, change it to the State digraph from which I got the highest interest payment, and file; or

c. Go into the form, delete the MX leaving the State code blank (this may pop up a TT error message again), and file.

SteamTrain

Level 15

@Ediepie

1) TTX software no longer uses "MX" for multiple states. They now use "XX" on the form when looking at the sheet in Forms Mode. That has been the case for a number of years...MX was used maybe 10 or more years ago (wild guess)

2) Unless you are a resident of Utah, you don't need to break out all the states. Just your own state, any US Territory bonds (Puerto Rico, Guam, US Virgin islands), and the remaining $$ are all lumped together as "Multiple States" (XX)

3) You really shouldn't be working in Forms Mode, make the entries using the Interview is safer for a 1099-INT

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*