The IRS has started to issue coronavirus rebates to tens of millions of people, but faces challenges in getting the payments to everyone.

Treasury Secretary Steven Mnuchin said Wednesday that more than 80 million Americans have already received their payments via direct deposit. But millions of people who haven’t previously given the IRS their bank information, or who may not typically file tax returns, are still waiting.

The IRS has taken steps in recent days to help facilitate getting the payments to people, but challenges remain in getting the payments to every eligible taxpayer in a prompt fashion.

Challenges include ensuring that low-income people get their payments and addressing the concerns of taxpayers who are struggling to use IRS web tools or who say they have not yet received their payments or received incorrect payment amounts.