Applying for a payment plan

[fasteddie577]

I've amended my son's 2023 tax return. He can't afford to pay the full amount due. Once he mails the amended tax return to the IRS, at what point does he apply for a payment plan on the IRS website? Should he include a letter with the amended return stating he will be applying for a payment plan?  Thank you in advance. 

[Bsch4477]

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

[fasteddie577]

When does my son apply for the payment plan? After the IRS contacts him about his return? Also, my post mentioned if he should include a letter with the return??

[Bsch4477]

Apply after the return is accepted and processed— usually 3 weeks if efiled, longer if mailed. An accompanying letter is not necessary and probably won’t be read. 

[fasteddie577]

Thank you.