We just need to be thankful not only that we receive the money from the employer but for other things as well. Since, the employer handed us the money that we worked hard for, it is but right that we say thank you. Saying thank you can mean a lot of things. First, we are thankful that the money was given to us and we are strong to receive it. Second, saying thank you means we acknowledge the receipt of it.
My salary is automatically credited to my bank account so, I always say thank you Lord whenever payday comes.