Cost of ca and other services for pvt ltd

My question is about yearly maintenance costs incurred to the founder of PVT ltd company 

Say after we register a pvt ltd company, and we are doing very less business very nominal and it would take few years to really improve

ex: 10-20 lakhs turn over per year, an event mgt company

in such case, how much cost would a company owners will incur yearly & what are they.. 

what my intention to know is, how much cost one has to bear in terms yearly filing costs, etc to run a pvt ltd company, if their turnover is very less

thanks