No. Do not put $0 in the box. Use the actual tax liability from your 2019 Maryland tax return.
If you do not have a copy for your 2019 Maryland return, fill out Maryland Form 129 and get a copy.
Your tax liability and your refund are two different things. Your tax liability is the amount of tax owed on your income. If your withheld more than your tax liability, you will receive a refund.
For example, if you earned $25,000 in Maryland, your tax liability would be $875. If you had $1,000 withheld from your pay, your refund would be $125.
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