Filing a tax return for a taxpayer who's passed away, isn't that different from filing one for someone still living.
Here's one thing that's different:
- Select Personal Info, then select your mother's name, then Edit.
- On the screen, Tell us a bit more about (Name), check the box next to (Name) has passed away.
- Enter the date and Continue.
- When you get to the File section, you should be able to just sign with PINs as usual.
Since this is a joint return, there won't be extra paperwork for claiming a refund.
I'm very sorry for your loss. If you have any additional questions, please feel free to reach out for help again.