Maryland Form PV is required if your employer isn't already taking enough out of your paycheck. Under the state’s "pay-as-you-go" rules, you are required to pay your taxes throughout the year as you earn your income, rather than in one lump sum when you file your tax return. If your job withholds at least 90% of your total tax bill (or 110% of what you owed last year), then those vouchers are optional and you can ignore them. However, if your son did not have enough withholding or had investment income where no taxes were being taken out, Maryland expects quarterly payments. Once he owed more than $500 at the end of the year, the state charged him interest and penalties.
The vouchers that TurboTax automatically prints are based on this past year- you should adjust them if your income changes.
