You are a little outside of the amendment period for 2018 so you will need to do it yourself, and mail it in. Or have someone prepare it for you.
Your 2020, Form 1040X can be amended in Turbo Tax and e-filed. Below I have listed several TurboTax articles that walk you through the process.
You will also have to amend your State Tax returns as well. For 2018 you will have to visit your States Taxation website for information on ow to do this. For 2020 you can do it in TurboTax.
A 2018 tax return can only still be amended if you are within three years from the date you filed your original return, you can amend your taxes by filing Form 1040X.
To amend a return for 2018 or earlier, you'll need to print the completed Form 1040-X and any other forms you're amending. Attach any necessary supporting documentation, such as: Any new or amended W-2s.
Per the IRS website, you can file Form 1040-X, Amended U.S. Individual Income Tax Return electronically with tax filing software to amend tax year 2019 or later Forms 1040 and 1040-SR, and tax year 2021 or later Forms 1040-NR. See Form 1040-X, Amended U.S. Individual Income Tax Return, Frequently Asked Questions for more information. You still have the option to submit a paper version of the Form 1040-X and should follow the instructions for preparing and submitting the paper form.
You can prepare your 1040X for 2018, to add your W-2, by downloading the form from the website below, and mailing it to the IRS yourself or you can have someone prepare it for you. For a 1040X you only change the area that applies, in your case it will be earned income or wages which is line 1, and you will be adding that to your reported wages for 2018. You will need your 2018 tax return for reference. You will then complete the form following the instruction below.
Click here for a copy of form 1040X for 2018. Note: You will make your adjustment to line one, in column A enter the amount from line 1 of your 2018 tax return as files, in column b add the change to your wages (i.e. the W-2 that you are adding), and column c will be the correct amount of wages for line 1. Per the instruction for Form 1040X see below, complete lines 1-23.
Click here for instructions to 1040X for 2018.
Click here for additional information on "How do I amend my Federal Return for a prior year?"
Click here for "How do I amend my State tax Return?"
Click here for a TurboTax video on amending your tax return.
Click here for how to correct your federal taxes.
Click here for a TurboTax article on filing tax return amendments.
Click here for TurboTax article on amending your tax return.
Click here for additional information on amending your tax return.
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