Hi Ayush,
My view is "this question is asking about legal solution of illegal practise".-Thats not possible
Because
As a auditor we have to complete audit befor filling of return. and u are saying that we start audit in aug-sept of A.Y. That time is not for start to audit. But that is for we have to complete audit.
Now some point:
In case of proprietorship: generally they not required audit due to less turnover/presumptive basis. yes even there are cases of audit. but 99% fees are pre decided and fees is less than the limit for the requirement of tds.
In case of listed companies question doesnot arise because due to qurterly audit fees generally agreed till april.
In case of others(including unlisted cos., pat. firm ):
if fees less than limit, then no problem.
but in case of requirement of tds.
practise as far as my knowledge is: generally till last date of filling of tds return both parties generally agreed to a particular amount for Audit fees. for the same after considering the payment till march, party make provison.....deposit tds, ca claim tds for the same amount.
But generally fees are not equal to agreed amount. now both parties treat the rest amount as the item of next year..mean deduct tds in next year, claim tds in next year. Client can enter those amount simply as exps of next year( if we go to legal way, we can entered as prior period items)