First you have 3 years to file an amended return for a refund ... so you have until 4/15/2022 to file a 2018 return.
Next, do NOT mail in another return as this can delay things even further. Under normal times an amended return would take 4 months or more to process but add on the 4 month covid delay this year and expect the return to take 6 to 8 months or more to process. More than 11 million envelopes piled up while the IRS was closed down and they are trying to dig out from under while more mail arrives everyday. When your envelope floats to the top of the pile and is opened and entered into the system for processing you may see it on the IRS tool ... just check once a week for a progress report so you don't drive yourself crazy and resign to waiting a long long time this year. https://www.irs.gov/filing/wheres-my-amended-return
Per the IRS ....
COVID-19 Mail Processing Delays
It’s taking us longer to process mailed documents including:
- Paper tax returns, and
- All tax return related correspondence.
We are processing all mail in the order we received it.
Do not file a second tax return or call the IRS.
