Your IRS tax refund check could be on the way. Here's how to track it online, and what to do if you lose your refund check.

More than a million American taxpayers could be leaving cash on the table as the deadline to claim tax refunds from three years ago is fast approaching. The Internal Revenue Service (IRS) has issued a warning that more than a million taxpayers are still eligible to receive a share of more than $1 billion in refunds—but they need to act quickly.

With staffing cuts at the IRS, many taxpayers are concerned about delays in receiving their refunds. Here are some things you can do to avoid a delay.