I contribute to TSP (401a) w/ a max contribution of $19.5k p/year. Software is registering it as a 401k & I'm being charged a fee. There's no 401a option, please help!

(Maybe it's NOT a TSP......a true TSP would be noted in box 12 of your W-2 with a code D, or coe AA if it was a ROTH TSP)

TSP contributions ARE equivalent to 401k contributions...they are 401k contributions with another name.

 There should be no penalty for that contribution..

BUT

1)  Your contributions should only be entered as a part of your W-2 entries, and should be noted in box 12 with a code D  (if traditional TSP and not a ROTH TSP).

2)  Do not enter the contributions a second time on the Deductions&Credits page as an IRA contribution.....an IRA is NOT a TSP/401k.

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OR, explain further what you are being "charged" for.  Software  Upgrades can be required for a number of reasons, certainly it is not just for having that TSP contribution.

Or again...maybe it is NOT really a TSP.   TSP's are specific to Federal Govt/Military employees.

The federal TSP is equivalent to a 401(k) and follows the rules of a 401(k).  A 401(k) is a type of 401(a) plan.