Q. Should I report that we lived together in 2023?
A. Simple answer: Yes.
That said, there is no place on the tax form to report whether you lived together. So the real answer depends on what you are trying to accomplish? You may use Married Filing Jointly (MFJ) filing status (or Married Filing Separately [MFS]), regardless of your living arrangement. If you are looking to use Head of Household (HoH) filing status, you living situation does not meet the standard for having lived apart the entire last half of the year, based on your description.