Organizations spend an average of 5.6% of the overall IT budget on IT security and risk management, according to the most recent IT Key Metrics Data from Gartner, Inc. However, IT security spending ranges from approximately 1% to 13% of the IT budget and is potentially a misleading indicator of program success, analysts said.

"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 practicing due diligence in security and related programs," said 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. Alternatively, you may be spending appropriately but have a different risk appetite from your peers.”

According to Gartner, the majority of organizations 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. Moreover, IT spending statistics alone do not measure IT effectiveness and are not a gauge of successful IT organizations. They simply provide an indicative view of average costs, without regard to complexity or demand.

Explicit security spending is generally split among hardware, software, services (outsourcing and consulting) and personnel. However, 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.

Gartner's experience is that many organizations 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. 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, 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 organizations can sometimes spend less than average on security as a percentage of the IT budget. The lowest-spending 20 percent of organizations are composed of two distinctly different types of organizations:

° Unsecure organizations that underspend;

° Secure organizations that have implemented best practices for IT operations and security that reduce the overall complexity of the IT infrastructure and work toward reducing the number of security vulnerabilities.

Gartner's view is that enterprises should be spending between 4% and 7% 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. 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, organizations 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," McMillan said.