The Cost of Staying Legacy: Calculating the Hidden Price of Outdated ITSM Systems

In many organisations today, legacy IT service-management (ITSM) systems linger “because we always have” rather than because they truly serve the enterprise well. But the real cost of holding on to these older systems can be surprisingly high—both in direct dollars and in opportunity lost. This blog explores how to quantify that cost and build a business case for change.

1. Direct costs: What you’re paying to keep the lights on

It’s often easier to spot the obvious expenses of maintaining a legacy ITSM platform, but even these can be underestimated.

• Maintenance cost per system For example, a recent survey found that outdated systems cost IT departments on average nearly US $40,000 annually just in maintenance efforts. (ServiceNow) In certain industries (manufacturing, energy/utilities), that figure rises above $50,000 per system per year. (ServiceNow)
• Infrastructure, licensing, patches and support Legacy systems often require hardware that is ageing, software versions no longer supported, special licences or support contracts. For example, studies show that maintaining one legacy application can incur tens of millions of dollars in ongoing costs. (recordpoint.com)
• Avoided costs when retiring legacy systems For organisations replacing legacy systems, studies show significant cost‐avoidance. One composite organisation was able to avoid ~$2.4 million in legacy system annual costs, plus ~$1 million in one‐time upgrade costs.

These direct costs can be modelled as: Annual legacy cost = System-maintenance cost + Infrastructure/licensing/upgrade cost + Support/administration cost

When you multiply that by the number of legacy ITSM systems (or modules) your organisation runs, and the number of years you keep them, the numbers mount quickly.

2. Indirect & hidden costs: The “soft” expenses that often bite hardest

The less visible costs of legacy ITSM systems are often the ones that silently erode value over time.

• Loss of productivity / wasted time Some estimates show IT workers lose on average 17 hours per week dealing with legacy system maintenance. (ServiceNow) That time could be used productively on improvements, new initiatives or service enhancements.
• Reduced agility and responsiveness If your ITSM platform cannot easily adapt to new workflows, integrate with newer tools or support new ways of working (DevOps, agile, hybrid teams), you pay in slower change cycles and missed opportunities. (Aspire Systems - blog)
• Talent drain and training burden Specialist skills needed to support older tech are harder to find, pay-rates can go up, and employee morale may drop. One blog noted that legacy systems lead to higher employee frustration and turnover. (stratusgrid.com)
• Security and risk overhead Unsupported or rarely updated systems pose a security risk. Data breaches cost big. According to one source, legacy systems were associated with large compliance and security burden. (recordpoint.com)
• Opportunity cost / innovation cost When a significant share of budget and resources is tied up just keeping the old system running, there’s less left over for innovation, new services or business growth. One article estimated that legacy systems account for 60-80% of IT budgets in some organisations. (Medium)

Hidden cost = (Lost productivity value) + (Higher risk mitigation cost) + (Opportunity cost) + (Training/turnover cost)

3. Sample cost calculation: What does this look like in practice?

Let’s walk through a simple illustrative calculation to estimate the cost of staying with a legacy ITSM system.

Assumptions for a mid‐sized enterprise

• One legacy ITSM system serving 5000 users.
• Maintenance/administration + licensing/infra = US $50,000 per year.
• Time lost due to inefficiency = 5000 users × 2 hours/week × 47 working weeks × US $30/hour = ~US $14.1 million annually (for illustrative purposes).
• Additional risk/turnover/training overhead = US $200,000 annually.
• Opportunity cost (e.g., slower service development, missed automation) = US $300,000 annually.

Total rough annual cost = $50k + $14.1m + $0.2m + $0.3m ≈ US $14.65 million Over three years (ignoring inflation) that would be ~US $43.9 million.

Now compare that to investment in a modern platform (licence + migration + change management) and you begin to see how the business case for migrating becomes compelling.

Studies support these orders of magnitude: For example, a composite organisation using Jira Service Management reported benefits of US $9.5 million over three years and $2.3 million in savings from retiring previous solutions. (atlassian.com)

4. Building your business case: Metrics and levers to include

When presenting the cost of staying legacy, it helps to focus on measurable levers and metrics. Here are key items to include:

• Current annual cost of legacy platform(s) Licensing + infrastructure + maintenance + human resource costs.
• Number of legacy systems or modules Each adds incremental cost, so the more systems, the higher the burden.
• Time wasted / manual tasks Hours spent per week/month dealing with work-arounds, manual integrations, patching.
• Incident/issue cost due to inefficiencies E.g., number of prolonged incidents, escalations, SLA violations tied to tool capability.
• Risk cost Estimate added cost of security incidents, penalties, compliance gaps, remedial fixes because of tool limitations.
• Opportunity cost Projects delayed, new features withheld, innovation paused due to tool limitations or resource constraints.
• Migration cost and payback period Estimate cost of migrating to a modern platform (software + consulting + training + change management) and estimate time until benefits offset cost (payback period).

A business case might include a simple ROI model: Payback = Cost of migration / Annual savings from retiring legacy + productivity gains + risk reduction Example: If migration cost = $1 million and annual savings = $500k, payback = 2 years.

5. Common pitfalls when quantifying legacy cost

A few traps to avoid when building your cost calculation:

• Ignoring “soft” costs If you only count licensing and hardware, you’ll understate the real cost significantly. The lost productivity, opportunity cost and risk elements are crucial.
• Underestimating the number of legacy systems Often organisations have multiple smaller legacy modules—each adding incremental cost.
• Assuming maintenance stays constant Legacy system costs typically rise over time as skills become rarer, support becomes harder and hardware ages.
• Using overly optimistic timeframes for migration benefit If you assume savings happen immediately after migration you may mis-estimate the payback period. Real adoption takes time.
• Not adjusting for escalation of risk Security and compliance costs may stay low at first, but as a system ages beyond vendor support, the risk and cost can ramp up sharply.
• Not recognising sunk cost bias Organisations may continue old systems simply because they have invested heavily, but the question should be “what will we pay going forward?” not “what did we pay in the past”.

6. Why this matters for service-driven teams

For IT service management teams, the tool they use is core to how teams deliver value—not just in ticket resolution, but in enabling service innovation, collaboration across IT & business teams, reporting, automation and scalability.

Having an outdated ITSM platform can mean:

• Service teams spend disproportionate time on tool upkeep rather than improvement.
• Workflows are rigid and cannot adapt to new business demands.
• Service experiences are inconsistent across teams or geographies.
• Integration with other business systems (HR, facilities, DevOps) is harder and costly.
• Management cannot easily get real-time visibility or analytics.
• Agents and end-users may bypass the system or create workarounds, reducing standardisation.

When you translate those into a cost framework—lost hours, higher risk, missed growth—you begin to clearly see the price of staying legacy.

7. Next steps: What your organisation should do

Here is a checklist for assessing your legacy ITSM cost and making the case for change:

• 1. Inventory your ITSM systems List all tools used for service management (incidents, requests, changes, assets). For each, estimate number of users, customisations, integrations, support hours.
• 2. Calculate current annual cost Licence/maintenance/infra cost. Internal labour cost for system administration, upgrades, patching. Estimate time lost by service teams due to inefficiencies (surveys, logs).
• 3. Estimate hidden/indirect costs Conduct a survey or gather data on hours spent on manual processes, workarounds. Assess risk cost: How many near-misses, security incidents, compliance issues stem from tool limitations? Assess opportunity cost: What service innovations are delayed because of tool limitations?
• 4. Estimate migration cost and potential savings Based on vendor data, peer success stories (e.g., the JSM study gave ~$2.3 million saving in legacy retirement). (atlassian.com) Estimate internal change management, training, data migration cost.
• 5. Build a financial model Show three- to five-year forward projection: continuing legacy vs migrating. Include scenario analysis (best case, moderate case, conservative case).
• 6. Engage stakeholders early IT leadership, service teams, business units, finance – align on metrics and value. Point out that cost is not just IT’s burden—service delivery, business agility and risk are affected.
• 7. Prepare a roadmap If migration is justified, plan phased rollout, pilot teams, measure adoption, track savings. Monitor realised savings and compare against model.

8. Conclusion

Holding on to legacy ITSM systems may feel safe, but the costs of inaction are often far greater than many organisations realise. From visible maintenance and licensing expenses to the hidden toll of lost productivity, risk exposure and missed opportunities, the burden adds up.

By quantifying both the direct and indirect costs—building a clear business case—you’ll be better positioned to decide whether staying legacy makes sense or whether moving to a more modern, agile service-management platform is the better path.

If you’re ready to evaluate your current ITSM footprint, quantify the cost of legacy, and explore alternatives that can deliver better value and agility for your service teams, we’re here to help. 📧 Contact us at sales@clovity.com or visit 🌐 atlassian.clovity.com to get started today