The IRS is preparing to send most Americans one-time stimulus relief checks in response to the coronavirus pandemic. But the bill excludes many financially vulnerable groups from receiving checks.

Individuals earning up to $75,000 will receive a check for $1,200, while couples earning up to $150,000 will get $2,400. Additionally, parents will receive $500 for each child under 17. That leaves out anyone 18 and older, who can still be claimed as dependents on another person's tax return.

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In fact, people who can be claimed as a dependent, even if they are not, are not eligible for a payment, Janet Holtzblatt, senior fellow at the Urban-Brookings Tax Policy Center, tells CNBC Make It in an email.

"A taxpayer is allowed to claim a full-time student between the ages of 19 and 24 as a dependent, so the parent will not get $500 for a college student, nor can the college student generally claim $1,200," says Holtzblatt. The parent will still receive their $1,200 check, if eligible.

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Experts predict that coronavirus will have profound impacts on the financial futures of young Americans. Not only are some left out of receiving stimulus relief checks, but young people, ages 16 to 24, will also be disproportionately affected by coronavirus layoffs, according to the Pew Research Center, since nearly half work in service-sector jobs, and make up 24% of workers in higher-risk industries overall.