The accountant for the deceased person, can give you the paper to make the missing car tax payment. A friend of mine is in the process of inheriting a house & a car from his deceased father & this it what he has done. All the papers are with his lawyer, to claim his inhertance, so I don't know how to register the car in his name yet. If you have the inheritence papers, stating that your husband has inherited the car, I would think you could take those to the Licensing Office to have the car registered in his name. Your husband would need to provide copies of his Passport/ID card & AFM (Greek tax number).