Unfortunately, you cannot e-file prior year returns. The IRS only allows e-files for the current tax year. You will need to mail them.
If the IRS knows you have a balance due on your 2018 return, they will automatically apply your refund (or part of your refund to that year). However, late filed 2018 returns will not have a priority of being processed during the IRS busy season. It may take several months for a prior year return to be processed.
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