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If you recently received a letter from the IRS, don’t ignore it.

The tax agency announced in mid-October that it would begin sending out letters to more than 9 million people who may qualify for thousands of dollars worth of stimulus payments and tax credits.

Those who received the letters were identified by the Treasury’s Office of Tax Analysis. Typically, these are individuals who aren’t required to file their taxes since they have very low incomes.

The IRS announced that certain Americans can still claim money for the 2021 Recovery Rebate Credit, the Child Tax Credit, and the Earned Income Tax Credit.

Taxpayers have until Nov. 17 to take advantage of the Free File to claim their benefits. The service is available on the IRS website until the November deadline.

 The tax agency said that people who believe they are eligible for these benefits but haven’t filed a 2021 tax return could do so on the Child Tax Credit website.

Many Americans received stimulus payments to stay financially afloat during the pandemic. The IRS relied on tax returns to determine which people qualified and where to send the payments, but the IRS also acknowledged that millions of Americans didn’t receive these payments.

These letters are similar to ones sent out in September 2020 that encouraged non-filers to submit a tax return to qualify for the first stimulus payment, officially known as the Economic Impact Payment.

Make sure to double-check your mail, so you don’t miss out on these payments.