While security spending can account for up to 13% of an IT budget, this could potentially be a misleading indicator of programme success, according to Gartner.
According to new research from the analyst firm, organisations spend an average of 5.6% of the overall IT budget on IT security and risk management.
"Clients want to know if what they are spending on information security is equivalent to others in their industry, geography and size of business in order to evaluate whether they are practising due diligence in security and related programs," explains Rob McMillan, research director at Gartner.
"But general comparisons to generic industry averages don't tell you much about your state of security. You could be spending at the same level as your peer group, but you could be spending on the wrong things and be extremely vulnerable,” he says.
“Alternatively, you may be spending appropriately but have a different risk appetite from your peers.”
McMillan says the majority of organisations will continue to misuse average IT security spending figures as a proxy for assessing security posture through 2020.
“Without the context of business requirements, risk tolerance and satisfaction levels, the metric of IT security spending as a percentage of the IT budget does not, by itself, provide valid comparative information that should be used to allocate IT or business resources,” he explains.
“Moreover, IT spending statistics alone do not measure IT effectiveness and are not a gauge of successful IT organisations,” McMillan states.
“They simply provide an indicative view of average costs, without regard to complexity or demand.”
Identifying the "real" security budget
Explicit security spending is generally split among hardware, software, services (outsourcing and consulting) and personnel. However, Gartner says any statistics on explicit security spending are inherently "soft" because they understate the true magnitude of enterprise investments in IT security, since security features are being incorporated into hardware, software, activities or initiatives not specifically dedicated to security.
McMillan says Gartner's experience is that many organisations simply do not know their security budget.
“This is partly because few cost accounting systems break out security as a separate line item, and many security-relevant processes are carried out by staff who are not devoted full-time to security, making it impossible to accurately account for security personnel,” he says.
“In most instances, the chief information security officer (CISO) does not have insight into security spending throughout the enterprise.”
To identify the real security budget, McMillan says there are many places to look, such as networking equipment that has embedded security functions, desktop protection that may be included in the end-user support budget, enterprise applications, outsourced or managed security services, business continuity or privacy programs, and security training that may be funded by HR.
According to Gartner research, secure organisations can sometimes spend less than average on security as a percentage of the IT budget. The lowest-spending 20% of organisations are composed of two distinctly different types of organisations:
Gartner's view is that enterprises should be spending between 4 and 7 percent of their IT budgets on IT security: lower in the range if they have mature systems, higher if they are wide open and at risk. McMillan says this represents the budget under the control and responsibility of the CISO, and not the "real" or total budget.
To demonstrate due care in information security, organisations need to first assess their risks and understand both the CISO's security budget and the "real" security budget found in the complicated range of accounts that may not capture all security spending.
"A CISO who has knowledge of all of the security functions taking place within the organization as well as those that are necessary but missing and the way in which those functions are funded, is likely to use indirectly funded functions to greater advantage," says McMillan.