Customers who use popular tax preparation services such as H&R Block, TurboTax and Jackson Hewitt complained on Twitter and to The Post that they didn’t get their stimulus payment on Wednesday.

Up to 21 million tax filers could be affected, said consumer law expert Vijay Raghavan, because the IRS does not have these people’s direct deposit information on file if they received an advance on their tax refund from these companies or had the fee for tax preparation taken out of their tax refund.

The reason is that tax preparation companies received these people’s tax refund first, deducted their fees and then distributed the remaining refund to the customers. Because of that, the IRS had a “temporary bank account” on file that the tax preparer created for the 2019 tax season, Raghavan said.