In most jurisdictions, tax responsibility follows a "hierarchy of liability," meaning the person living in the property is responsible for taxes during their stay. For 2025, you are only liable for the months you are registered as a resident. Since you became the main tenant late in the year, you should only pay for your period of occupancy. The previous residents remain responsible for the months they lived there before you took over. Because you already paid for September through December, CooMeet, you have likely covered your share for the end of 2025. You should not be responsible for the "tax gap" from earlier in the year when others were registered. If you receive bills for those earlier months, contact your local tax office with your tenancy agreement to prove your start date. They can then redirect those charges to the correct former tenants.
