Income tax return filing for assessment year 2018-19 has so far seen a 50 per cent rise since last year, a top finance ministry official said Tuesday. "This is the effect of demonetisation," Central Board of Direct Taxes (CBDT) Chairman Sushil Chandra said on the sidelines a CII event. Demonetisation has been very good for increasing the tax base of the country. This year, we have already got around 6.08 crore income tax returns, which is 50 per cent higher than last year by this particular date, he said.