- You can file back as far as you want. You can not get a refund for 2014 and 2015.
- They will not charge penalties. It is the opposite, they pay you interest.
- You can get refunds for 2016, 2017 and 2018. You have until April 15 to file for 2016 and get a refund.
- The IRS will mail you a check.
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