You can make tax payments through a free US Treasury service called eftps (Electronic Federal Tax Payment System). You have to establish an account, get a PIN, submit your bank info, etc. Then from that website, you can log in and make any tax payments, Estimates or your 1040 tax due. It should let you schedule several payments ahead. Once you establish your account, you can also make free payments by phone.
Start here…https://www.irs.gov/payments/eftps-the-electronic-federal-tax-payment-system
