When filing jointly, you prepare only one tax return. You include the income and deductions for both of you in the one tax return.
My husband and I efiled jointly, but now we owe money to the IRS. Can either one of us create an account on the website using their SSN and pay the money owed? Or do we need to somehow create a joint IRS account online (which seems not possible)?
If you have federal tax due you can pay by mailing your payment with the 1040V voucher, (which has the address printed on it, having the payment taken out of a designated bank account, or you can pay directly on the IRS website.
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/00/26212
You must pay your state tax due using the state’s preferred method of receiving payment. For most states that will be by making a payment to the state’s own tax website, or by mailing a check or money order.
https://ttlc.intuit.com/questions/1901670-how-do-i-contact-my-state-department-of-revenue
To apply for a payment plan with the IRS