If you have already filed your taxes, and you made a mistake on your states withholding, there are several things you can do:
- You can file an amended return, and correct the error.
- If you choose not to do that and you owe money, they will figure it out and send you a bill. There may be interest and penalties on it.
- If your withholding was more than what you posted, and you don't file an amended return you will not get that money back.
Therefore, I recommend you prepare an amended return.
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