On February 17, 2022, we notified IRS management of our concerns with undeliverable payments that post after the processing of the tax return. In these instances, the IRS processed the tax return as if the payment was received by the taxpayer. As a result, the taxpayer would receive less Child Tax Credit than they are eligible to receive. We recommended that the IRS develop a process to identify undeliverable payments after processing of the TY 2021 tax return.