Service tax payable under reverse charge mechansim

we are a pvt ltd co. we have hired a helper who helps in office work, we pay monthly compensation of rs. 6000/- pm . he is an individual and therefore there is no service tax applicable on him . we are also not covered under service tax . do we have to pay service tax under reverse charge mechanism. under service tax rules? if any such service is recd from individual what heads are they be paid under to not come under RCM?