Anyone with an EIP should have received Notice 1444 (and the upcoming Notice 1444-B for the second one).  That's the good news.

The bad news:  By my estimation, 98.81401% of the people who received this Notice, threw it away.

And according to the draft instructions for 1040, your clients should also be able to check the amounts of EIP's paid on this IRS webpage: https://www.irs.gov/payments/view-your-tax-account

No.

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@rbynaker wrote:

By my estimation, 98.81401% of the people who received this Notice, threw it away.

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I think that is high.  I would say 98.81400%.  

😁