You can pay using digital wallets such as PayPal and Click to Pay; There’s a maximum number of card payments allowed based on your tax type and payment type; Employers’ federal tax deposits cannot be paid by card; see how to pay employment taxes; For card payments of $100,000 or more special requirements may apply; Fees by Processor
Since Direct Pay works without a login, you will need to verify your identity each time you revisit Direct Pay after closing it. Make sure you enter your name and address exactly as they appear on the tax return you are using for verification. If your name or address have changed, try selecting a prior or later year for verification and enter the information from that year.
You cannot pay estimated taxes with a direct debit. IRS instructions for Form 1041-ES require estimated tax payments to be made with a check and voucher or through EFTPS.