Amid a tech sell-off that has seen the Nasdaq index lose 28 per cent of its value so far this year and the wider S&P 500 fall back 18 per cent, should Ireland worry for the IT multinational sector employing over 100,000 people here and paying most of the corporation tax take? New analysis by the Revenue Commissioners shows that multinationals accounted for €12.3 billion of the corporation tax collected last year – that’s 80 per cent of net receipts. Meanwhile, the top 10 companies in Ireland paid more than half of this tax. Although they are not named, it…