See the list below for links to each state’s portal to pay estimated taxes.

IRS (Federal income tax): DirectPay

Alabama: MyAlabamaTaxes  
Alaska: No personal income tax
Arizona: AZTaxes
Arkansas: ArkansasTaxpayerAccessPoint
California: FranchiseTaxBoard
Colorado: DepartmentOfRevenue      
Connecticut: MyconneCT
Delaware: DelawareTaxpayerPortal District of Columbia: MyTaxDC  
Florida: No personal income tax
Georgia: GeorgiaTaxCenter
Hawaii: HawaiiTaxOnline
Idaho: IdahoStateTaxCommission
Illinois: MyTaxIllinois
Indiana: INTime
Iowa: GovConnectIowa
Kansas: TaxPaymentPortal
Kentucky: KYDoR
Louisiana: LaTAP   
Maine: MTP
Maryland: MarylandTaxesOnlineServices
Massachusetts: MassTaxConnect
Michigan: Site down until Nov 12th, 2025
Minnesota: DepartmentOfRevenue
Mississippi: MississippiDepartmentOfRevenue
Missouri: MissouriDepartmentOfRevenue
Montana: TransActionPortal
Nebraska: DepartmentOfRevenue
Nevada: No personal income tax
New Hampshire: No personal income tax
New Jersey: DivisionOfTaxation
New Mexico: TaxpayerAccessPoint
New York: DepartmentOfTaxationAndFinance
North Carolina: NCDoR
North Dakota: NDTAP
Ohio: OHTax
Oklahoma: OKTap
Oregon: RevenueOnline
Pennsylvania: myPaTH
Rhode Island: DivisionOfTaxation
South Carolina: MyDORWay
South Dakota: No personal income tax
Tennessee: No personal income tax
Texas: No personal income tax
Utah: TaxpayerAccessPoint
Vermont: myVTax
Virginia: VirginiaTax
Washington: No personal income tax
West Virginia: WestVirginiaTaxDivision
Wisconsin: MyTaxAccount
Wyoming: No personal income tax