The deadline to get those delinquent 1040s to the IRS for most taxpayers is April 18. Those living in Maine and Massachusetts have until April 19.
"By law, there's only a three-year window to claim these refunds, which closes with this year's April tax deadline," IRS Commissioner Chuck Rettig said in a statement on March 28. "We want to help people get these refunds, but they need to file a 2018 tax return before this critical deadline."
The median amount owed to taxpayers who haven't filed their returns is $813, according to IRS estimates. That means half of those refunds will be more and half will be less than $813.
The state with the highest potential median refund is Alaska at $969. The lowest is Idaho at $686.
In addition, some of those who did not file a 2018 return could be eligible for the Earned Income Tax Credit, which was worth up to $6,431 for that tax year. The EITC income thresholds for 2018 were as follows:
- $49,194 ($54,884 if married filing jointly) for those with three or more qualifying children
- $45,802 ($51,492 if married filing jointly) for people with two qualifying children
- $40,320 ($46,010 if married filing jointly) for those with one qualifying child, and
- $15,270 ($20,950 if married filing jointly) for people without qualifying children.
Forms 1040s, 1040-As and 1040-EZs for 2018 can be found on IRS.gov.
Those who are missing W-2s or other income forms and who cannot get them from employers, banks or other payers can use the IRS Get Transcript Online tool.