You can view details of your current payment plan (type of agreement, due dates, and amount you need to pay) by logging into the Online Payment Agreement tool using the Apply/Revise button (see link below. make sure you use the right link. there is one for individual (that's you) and one for business).
What You Can Change Using the Online Payment Agreement Tool
You can use the Online Payment Agreement tool to make the following changes:
Change your monthly payment amount
Change your monthly payment due date
Convert an existing agreement to a Direct Debit agreement
Change the bank routing and account number on a Direct Debit agreement
Reinstate after default
https://www.irs.gov/payments/online-payment-agreement-application
