Global macroeconomic and financial sector headwinds are set to take a deep toll on the domestic IT companies' revenue growth in FY24, a report said on Friday. The Rs 10 lakh crore sector is likely to witness revenue growth plunging by up to 9 percentage points to 10-12 per cent in FY24 as against the nearly 20 per cent growth estimated in FY23, Crisil Ratings said.