A: Not always. You can generally file Form N-400 for citizenship even if the physical green card is expired. For a properly filed N-400 submitted on or after December 12, 2022, the receipt notice extends the Permanent Resident Card’s validity for 24 months from the “Card Expires” date, not from the N-400 filing date. During that extension period, use the expired card together with the qualifying receipt as evidence of LPR status. If that extension has already expired, temporary evidence of LPR status may be needed. You may still need Form I-90 or temporary proof of permanent resident status if the card is lost or you need longer evidence. Conditional residents should not use Form I-90 to remove conditions.
Sources: USCIS Naturalization and Green Card Evidence: https://www.uscis.gov/policy-manual/volume-12-part-d-chapter-2