If the advance payments total differs between their Letter 6419 and their IRS Online Account, they should rely on the total in their Online Account. If taxpayers believe that they received a different amount than what the letter indicates, they should check the IRS Online Account, as this is the information that the IRS has on file. Submitting a different amount on the tax return could mean additional IRS review is needed and could mean a refund delay.

The IRS Online Account has the most current advance payment information. However, the IRS warned against relying on the Child Tax Credit Update Portal or Tax Transcripts for the advance payments total; this information may be outdated.