You'll both use the same adjusted gross income (AGI) from your originally filed 2019 joint return. To prevent a rejection, don't split or allocate the AGI, even if doing so seems more logical to you. The IRS requires your 2019 AGI to verify your identity for e-filing. If you're paper-filing your return, you won't need your AGI because those are manually processed. If you tried to enter "0" and were not successful at processing your return, you can ​​​​see the information here for steps to correct your AGI. If you can wait a few days then resubmit your tax return and see if you are successful at that time. If it doesn't work you will need to mail in your return.