I picked mail by check on my returns but I want to now set up a payment plan

[SherekaB · Accepted solution]

This is fine if you checked this. This allows you a little more flexibility when you choose this option. You can go directly to the IRS website below and apply for a payment arrangement.

https://www.irs.gov/individuals/online-payment-agreement-application

As for your state you can contact them directly to see what their payment arrangement terms are. All states are different. Click your state below to get their contact details and website info.
https://ttlc.intuit.com/replies/3300211