Payments Secure Online Payments to Smith Patrick CPAsPAY NOW IRS PaymentsYou should have received a federal tax filing communication from our team with any amounts due to the Internal Revenue Service (IRS).MAKE A FEDERAL TAX PAYMENT ONLINE Important deadlines Income tax remittance: April 15Income tax extension: October 15Estimated Quarterly Tax Payments: April 15June 15September 15January 18 State Tax Payments Missouridor.mo.gov Illinoisillinois.gov Coloradocolorado.gov Marylandmarylandtaxes.gov Californiaftb.ca.gov Connecticutportal.ct.gov Mississippidor.ms.gov North Carolinancdor.gov