For most people the IRS will begin processing and accepting/rejecting efiled returns SOMETIME on January 29, 2024. A few returns have been processed earlier for IRS testing purposes, but the general processing of returns opens tomorrow. There can be a backlog once they open processing, and returns are pulled in batches from the various tax services, so you may or may not hear anything back on Monday.
FYI ... the IRS has not accepted any returns in test batches for the past 6 days so the backlog could be significant and/or they may be having technical difficulties.
