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Owing state tax Interest and a result of living in Maryland and working in Virginia
Ultimately, you are the one that is responsible for your tax filings and your payments (It's all linked to your SSN, after all). If this fee/interest is the result of a filing error, and you went through a preparing company which assumes liability for their own errors, then you should speak to them. They will likely correct this and pay the fees.  On the other hand, if this is the result of not making quarterly payments, then you are responsible for it. (Source: Comptroller of Maryland Site) If you [...] do not have Maryland income taxes withheld by an employer, you can make quarterly estimated tax payments as part of a pay-as-you-go plan. If your employer does withhold Maryland taxes from your pay, you may still be required to make quarterly estimated income tax payments if you develop a tax liability that exceeds the amount withheld by your employer by more than $500. From this watered-down public-facing resource, it seems like you'll get hit with fees for not making quarterly payments if your tax liability exceeds $500 beyond what is withheld (currently: $0).