Yes, you son-in-law can amend their return to change filing status from single to married filing jointly. Before amending the tax return your son-in-law will need to wait until such return has been accepted by the IRS. You can amend a return only after it has been filed and accepted by the IRS. E-filed returns are considered filed when you have received notice from the government that your return has been accepted. If your return has been rejected, it is not considered filed.
Mailed returns are considered filed the date you post your return.
When your son-in-law is ready to amend, a previously filed return can be accessed in TurboTax online, from the TurboTax home page. Scroll down the screen to the section Your tax return & documents. If you have used TurboTax CD/download, then you can amend your previously filed return by selecting Other Tax Situations, and then scroll down to Other Tax Forms.
Just an FYI regarding spouses that file separate. When one spouse itemizes, the other spouse must also itemize their deductions on their return as well. The other spouse cannot take the standard deduction.
@PatinWA
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