not file it Fy 2017-18

In case your Total Income is above 5L, you have to pay fine of Rs 10,000/- as per sec 234F of Income Tax Act

If your ITR is not filed then You are liable to Penalty u/s 234F of Rs. 10,000/-.

Your audit report is also not filed then you will be liable to Penalty u/s 271B of 1/2% of Turnover subject to maximum of Rs. 1,50,000/-

The maximum penalty which can be charged is Rs. 10,000. If you file your ITR after the due date (31st August 2018) but before 31st December 2018, a penalty of Rs 5,000 will be levied. For returns filed later than 31st December 2018, the penalty levied will be increased to Rs 10,000. There is a relief given to small taxpayers – the IT department has stated that if the total income does not exceed Rs 5 lakh, the maximum penalty levied for delay will be Rs 1,000.