Rhode Island General Laws Title 44. Taxation § 44-30-56. Payments of estimated tax

(a) General. The estimated Rhode Island personal income tax, in excess of any credits allowable against the tax, shall for each taxable year be paid not later than as follows:

(b) Late declarations. If a declaration is filed after the due date, including the date fixed by an extension, the installment payable on or before the filing date shall be paid at that time. The remaining installment shall be due on the prescribed date.

(c) Amendments of declaration. If an amendment of a declaration is filed, any remaining installments shall be ratably increased or decreased (as the case may be) to reflect any resultant increase or decrease in the estimated Rhode Island personal income tax, in excess of any credits allowable against the tax. If an amendment is made after September 15 of the taxable year, any resultant increase shall be paid at the time of filing the amendment.

(d) Fiscal year or short taxable year. This section shall apply to a taxable year other than a calendar year by the substitution of the months of a fiscal year for the corresponding specified months and shall apply to a taxable year of less than twelve (12) months under regulations of the tax administrator.

(e) The payments of estimated tax shall be a credit against tax for the taxable year as may appear on the tax return.