The IRS currently only allows e-filing for 2021 Tax Returns. They will not accept e-filing for previous year tax returns, so you can no longer prepare and e-file a previous year tax return online. However, you can prepare paper returns for previous years and mail them to the IRS.
If you started a 2020 Return on eFile.com, see this page.
If you did not receive Stimulus 1 and/or 2, did not claim them on a 2020 Return, and were in fact owed them, then file back taxes now or within three years. The only way to claim Stimulus 1 and 2 is by filing a 2020 Return. To do so, fill in the forms manually and claim the credit on the Form 1040. Estimate your Stimulus 1 and 2 amounts here:
Stimulus 1 Calculator
Stimulus 2 Calculator
Once you have these amounts, combine them and report this on the Form 1040, Line 30, Recovery Rebate Credit: 2020 Form 1040.
If you claim dependents, be sure to add their information in the dependents section. Add your other information on the Form 1040 - name and address, wages, retirement, standard deduction, etc. Find any other required 2020 Forms here.
Prepare and e-file your 2021 Taxes on eFile.com - the eFile platform handles all the forms and calculations for you and will help you claim Stimulus 3. The IRS and states only allow current year returns to be filed electronically (currently, 2021).
See information on stimulus checks and how to request a payment trace.
For 2020 and all other previous year resources, see back taxes.