Tax experts are raising a red flag for people who have health coverage through the Affordable Care Act.
Now, users will need to file a new form in order to get tax credits to help pay for insurance premiums.
But because the Health and Human Services Department has to send out millions of them, there's concern that some might not get their forms in time.
A delay by HHSD could start a chain reaction that may lead to delays for tax refunds for millions of people.
The Obama administration says officials are on the job, working to avoid delays.