like i said you need to check your withholding based on what you estimate your taxable income will be for 2019
if withholding covers 90% of the tax there are no penalties. if net taxes or balance due after withholding is $1,000 or less there are no penalties.
in these cases since there are no penalties there is no requirement to make estimated tax payments for any balance that's estimated you'll owe, you do not file $0 estimated tax vouchers
there will be no requirement to file schedule C in 2019 because you said there was no income or expenses.
