PARTNERSHIP FIRM TURN OVER LESS THAN 20 LAKHS

As per my opinion, You cant File ITR -3 .Because its applicable only to Individual & HUF.

ITR 4 would be applicable if you want to file return u/s 44AD

But if you dont want to opt 44AD, You can File ITR 5,but you have to fill balance sheet  & P/L statement details.

This is my opinion.

sir is it tax audit or normal filling

You can use ITR-5  for normal filing also.

You said your Turnover is less than 20 lakhs , Audit is not required.