How did i underpay maryland tax last year when I received a refund?

[SweetieJean]

<a rel="nofollow" target="_blank" href="https://forms.marylandtaxes.gov/current_forms/502UP.pdf">https://forms.marylandtaxes.gov/current_for...>

[lizarpv]

That was last year's refund, you may not have had enough withheld for the current tax year, therefore you underpaid for the current year.