GST for OPC with 54 lakhs turnover ?

What is GST for OPC with 54 lakhs turnover ?

45 lakhs as directory salary. That will be only expense.  18 percent GST for my opc since it is doing IT  service.

I understand i can get refund later on. I cannot execute LUT since i cannot do bond worth tax liability + bank guarantee. I just started OPC last month .

Thanks :)