Thanks for asking your question! I'm sorry to hear about your tax issue and I'm going to try my best to help you understand or resolve it.
Thank you for your question, and thanks for using JustAnswer.com. If your wife already paid taxes on her income this year on her own, you will need to file an amended return
in order to have a joint tax return. You would have your wife file an amended return changing her status from married filing separately to married filing jointly, and then include your income with that amendment. You would have to mail the return in, you cannot electronically file it because your wife has already filed.
I would wait until your wife gets her refund, if any, before turning in your amended return.
Please let me know if you need anything additional. Thanks again for using JustAnswer.com and have a great night.
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You should be aware that your question, as with most tax questions, can never really be answered completely...addressing all the permutations; that is because of the many assumptions that have to be made I have done my best to determine what I think you are asking and answering it in the most direct and understandable manner possible. If, however, after reviewing the questions, you have any uncertainties or further questions, please do not hesitate to ask.