Well you have a number of issues that need to be addressed:
- You have a termination of the multi-member LLC when that occurred and you would have had a final return due the 15th day of the third month after that occurred. This means your return is technically late; almost a year late.
- This also means that you would be reporting the full year activity on your 1040 Schedule C.
- Depending on what was held by the LLC, you may could have either a step-up or step-down on one-half of the assets held by the LLC.
- As a result of number 3, this means that your depreciation schedules would have to be updated to reflect the step-up or step-down.
- Attached is an IRS Revenue Ruling that discusses your facts and you are situation 1.
https://www.irs.gov/pub/irs-drop/rr-99-6.pdf
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
