To avoid incurring interest charges for underpaying your estimated taxes, your four installment payments must be paid timely and must total:
- 90% of the state income tax developed, as you are earning income, for the current year OR
- 110% of the previous year's state tax liability paid in four equal quarterly installments.
Each installment payment must be at least 25% of your required total.
If you make your estimated payments online you may also schedule future payments.