I suggest you do the 2018 first. The 2018 return is already processed, so there will not be any conflict when you submit it. Also, you may owe taxes and you can get that cleared up.
For 2019, wait until you get your refund or at least 3 weeks before you send the amended tax return. This ensures that the return is process and there are no conflicts.
This may help you start on the amend process:
If you've filed your return and need to add additional information, then you will have to prepare an amended return in TurboTax. I suggest you wait at least 3 weeks before sending it to ensure that the IRS does not confuse the returns. You have three years to file an amended return.
If you used TurboTax Online, simply log in to your account and select “Amend a return that was filed and accepted.”
If you used our CD/download product, sign back into your return and select “Amend a filed return.” You must file a separate Form 1040X for each tax return you are amending.
Amend ONLINE OR Amend CD/Download Amend 2016 - 2019
You will have to mail the amended return. The IRS limits the system to only one Social Security number or Tax ID to be E-Filed. This is to guard against fraudulent tax returns.
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