How can i make complete payment online after filing. I was going to make installment payments originally

[GiseleD]

You can pay the IRS online here. 

[adolphsloboda]

Your identity could not be verified. Please review and re-enter your information or try a different tax year.

i entered everything correctly

[RobertG]

Remember, they are asking for information from a prior tax year.

If all else fails, pay by check:

If paying a 2019 income tax liability without an accompanying 2019 tax return, taxpayers paying by check, money order or cashier's check should include Form 1040-V, Payment Voucher with the payment.

Mail the payment to the correct address by state or by form.

Do not send cash through the mail. Indicate on the check memo line that this is a 2019 income tax payment.