Corporate departments outside of the IT department, globally, are forecast to spend $609bn in 2017:
A new update to the Worldwide Semiannual IT Spending Guide: Line of Business from the International Data Corporation (IDC) forecasts worldwide corporate IT spending funded by non-IT business units will reach $609 billion in 2017, an increase of 5.9% over 2016. The Spending Guide, which quantifies the purchasing power of line of business (LoB) technology buyers by providing a detailed examination of where the funding for a variety of IT purchases originates, also forecasts LoB spending to achieve a compound annual growth rate (CAGR) of 5.9% over the 2015-2020 forecast period. In comparison, technology spending by IT buyers is forecast to have a five-year CAGR of 2.3%. By 2020, IDC expects LoB technology spending to be nearly equal to that of the IT organization.
Meanwhile, all in, global IT spend was estimated at $2.4tn in 2016, but that includes telco and consumer tech. And, this demographic breakdown for enterprise IT spend:
In terms of company size, more than 45% of all IT spending worldwide will come from very large businesses (more than 1,000 employees) while the small office category (the 70-plus million small businesses with 1-9 employees) will provide roughly one quarter of all IT spending throughout the forecast period. Medium (100-499 employees) and large (500-999 employees) business will see the fastest growth in IT spending, each with a CAGR of 4.4%.
Sources: Technology Purchases from Line of Business Budgets Forecast to Grow Faster Than Purchases Funded by the IT Organization, According to IDC, March 2017 and Worldwide IT Spending Forecast to Reach $2.7 Trillion in 2020 Led by Financial Services, Manufacturing, and Healthcare, According to IDC, Aug 2016.