Last week’s release of Exchequer figures left observers scratching their heads after May’s corporation tax take plummeted by €1.1 billion, or 30 per cent compared with the same month last year. “This reflects once-off factors that boosted May 2024 receipts, distorting the year-on-year comparison,” the Department of Finance noted. While last year’s May take was high, this year’s correction is much deeper than a reversal of that gain. It sets the Exchequer back to May 2021’s level, erasing four years of growth for that month.  Time for an update to my multi-coloured monthly corporation tax chart, it seems. “Once-off factors”,…