First----is that the mistake you made? Did you enter all of the income under one name? You fix the 2018 mistake by paying the IRS. And you check to see if you made the same mistake on your 2019 return. If you did, then amend your 2019 return before the IRS sends you a letter about it. You will probably owe some tax when you amend 2019 too.
How do I amend my 2019 TurboTax Online return?
https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-q...
https://ttlc.intuit.com/questions/1908543-do-i-need-to-amend
https://ttlc.intuit.com/questions/3318997-how-does-the-refund-math-work-on-amendments
Look more carefully at the income screens when you enter a W-2---there will always be a spot with each spouse's name on income screens. You have to be careful to enter the income under the right name on a joint return.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
