i request you to visit McDonalds, their display board is for "Mcdonalds" not for the company who holds the McDondalds brand.
it also display the name of actual shop at bottom of board
at the entrance, u can see a small board, which display the name of actual shop, without any brand
tax authority are asking you about that small name board, not about the hording which you are going to use for promotion of your principal,
you name board fixed at entrance should contain your name, address and nothing.