SAP ECC 2027: Extending Maintenance Buys You Time. It Doesn't Buy You Readiness.

Mainstream maintenance for SAP ECC (ERP 6.0, EHP 6–8) ends on 31 December 2027. Customers can extend into 2030 with a two-percentage-point surcharge on the maintenance fee base — not simply a two percent increase on the existing bill. [1]

A three-year extension can be the right call. Other investments may take priority, the landscape may be complex, or the organisation may not yet have the capacity for a transformation this size. None of that is in question here.

What matters is what happens during the time it buys.

What The Extension Actually Buys You

Paying the surcharge says one thing: the organisation needs more time, and is willing to pay for it. Extended maintenance has operational value — it keeps support running. On its own, it modernises nothing. It doesn't improve data quality. It doesn't bring process automation or AI usage any closer. The surcharge is the cost of keeping the current system alive; the transformation still has to be paid for, later, in full.

The surcharge, once paid, isn't recoverable. What makes the bought time valuable is starting transformation preparation inside it — clarifying business and IT ownership, the target state and the project's scope early, and reducing risk before the programme itself starts. That takes as much attention on the organisational side as the technical one: a capable project office and prior project experience are a good foundation, but an ERP transformation touches multiple business units' daily work, shared data and interdependent processes at once — and the decisions and resourcing the project creates need their own planning.

The surcharge is easy to quantify. The risk of a postponed go-live is harder. Gartner's 2025 estimate put roughly 39% of the ~35,000 ECC customers on S/4HANA already by the end of 2024, forecasting around 17,000 still on ECC by the end of 2027, and 13,000 by 2030. These are earlier estimates, not today's numbers — but they show how many organisations may be scheduling large transformations into the same window. [2]

Delay carries more than market risk. More than 60% of S/4HANA transformations deviate from plan and budget — and Horváth names the root cause plainly: organisational competencies are overestimated. [3] Time doesn't fix that on its own. Unclear business–IT ownership, slow decision-making, and uneven readiness across sites or business units don't resolve themselves while an organisation waits. Left unaddressed through the extension years, the same structural problems arrive at the 2030 deadline — inside a tighter schedule.

Meanwhile, the current ERP environment won't stand still either. New business requirements, custom developments, interfaces and bolt-on solutions keep accumulating. Defer their review, and the migration starts with more technical debt than it needed to. The reverse is just as true: the extra years are also an opportunity to clean up custom code, master data, simplify processes and tidy system connections.

Only 8% of S/4HANA projects finish on schedule. [3] A complex programme starting in 2029 can find the 2030 deadline tight easily.

2030 isn't a hard stop on every support option. SAP offers customer-specific maintenance on different terms, and the SAP ERP, Private Edition, Transition Option can extend the support for some large, complex systems to the end of 2033, subject to its own technical and contractual requirements. It isn't a simple three-year extension of existing ECC maintenance — the terms for a specific system and contract need checking separately. [4]

Transformation Needs A Working Organisation Behind It

An S/4HANA rollout doesn't just re-platform the business — it forces business processes to be rethought. Standardisation demands decisions: which exceptions survive, where the standard applies, who signs off what, and what in-house capability the organisation needs to run the system after go-live. None of that gets solved by installing new software.

A programme that spans processes and organisational boundaries quickly shows whether decision rights work in practice, not just on the org chart. A typical scene: in a workshop on adopting the standard solution, the consulting team and IT find the technically right answer — but no one in the room can approve it on the business side. The decision doesn't disappear. It just moves to the next meeting, where the same thing can easily happen again.

Organisational readiness often gets treated as a communication and training question. Those matter — but they don't answer the harder one: how does leadership know the organisation is actually ready? That doesn't show up in a workshop or a leadership alignment meeting — everyone there speaks for their own area, not for how the company actually runs. The only way to answer it is to look at how the business operates in practice.

Readiness Starts With How The Business Actually Runs

Start with how completely the organisation thinks in processes, not just tasks. Can an order be tracked from intake through delivery to financial settlement? And when the process stalls at a boundary — between sales and logistics, say — does anyone catch it and fix it, or does the problem sit in the gap between teams?

Naming a process owner isn't enough on its own. Someone has to own the output and the reliability of the data it produces: who's responsible for fixing bad master data, who signs off the KPIs, who steps in when results miss target.

Without that, the new system's data stays unreliable. If no one takes ownership of these decisions, how will you know whether moving to S/4 actually made order processing faster or reduced the number of orders fulfilled incorrectly?

The target state and business requirements are only as sharp as process ownership is clear. Uncertain ownership doesn't produce a sharp target state — it produces a compromise, where every business area defends their own view and no one ends up accountable for the result.

Make personal dependencies visible when assessing in-house knowledge. On the IT side, if only one person understands how an interface works or why a custom development exists, losing them puts both the project and the new system's operation at risk. Architecture and development knowledge needs to be accessible and transferable inside the organisation — AS-IS documentation, shared technical work, and trained backups. Documentation is only good if someone else can use it to get the job done.

The same is true on the business side. The most experienced people are often essential to several projects at once, while daily operations still rely on them. Bringing in and training additional colleagues early in the preparation phase to help with data checks, testing, and process documentation allows key people can focus on reviewing and guiding the work instead of having to do everything themselves. That requires both time and support from leadership. Companies often plan for employees to spend 50% of their time on the project, when in reality they need to spend closer to 70–80%.

Readiness also varies, almost always, across sites and business units. On a complex ERP programme, unclean data, slow decisions or resistance to change in one area can hold up others. That makes it a priority during the preparation phase to ensure that the relevant leaders formally accept and empower the project organisation and its leadership before kickoff. The project management office needs executive mandate and concrete tools — enforceable deadlines, shared resource planning, and an escalation path that actually produces a decision on stuck issues by a set date. Designated decision-makers of business areas or sites rule on business priorities and local exceptions; the PMO's job is making sure that structure works.

Unreadiness Shows Up In The Budget

If key users can't find time for testing alongside their daily work, the project falls behind — or worse, testing gets rushed and defects only emerge after go-live. If an overlooked exception forces the team to revisit an already-approved process, system settings and documentation may need to be redone. That means delays, extra costs, and often disputes between the client and consultants over who is responsible for the rework and who should pay for it. And if knowledge transfer is rushed, the company may remain dependent on external support long after go-live. Together, these push up project costs and strain the business at the same time.

More than 60% of S/4HANA transformations deviate from plan and budget — respondents named weak project management, repeated process and concept redesign, and delayed decisions among the causes. The research's own findings already point to organisational causes, not technical ones. [3]

Prosci's research puts it plainly: human and organisational factors carry roughly six times the weight of technical factors in realising ERP benefits. [5]

But these risks don't look the same in every organisation. Some struggle with departments that disagree on how processes should work, others with overdependence on a handful of experienced employees, gaps in SAP knowledge, or business leaders who aren't sufficiently involved in the project. Understanding where these weaknesses lie before the project starts gives companies a chance to address them before they turn into delays and additional costs.

That's why assessing organisational readiness should be part of S/4HANA preparation, not something to think about once problems emerge during implementation.

Pair The Maintenance Decision With A Readiness Plan

A practical way to start is to assess organisational readiness department by department. Sit down with the people who know how each area operates and try to answer a few key questions:

• Decision-making: Who makes the final call when departments disagree on a process or responsibility? Is this clear to everyone involved?
• Knowledge: Which processes or systems depend heavily on one or two employees? Is there anyone who could take over their responsibilities?
• Project capacity: Who are the people you'll need for the project? How much time can they realistically dedicate to it, and who will cover their daily work?
• Leadership commitment: Ask managers what they would do if an important project deadline conflicted with their department's operational targets. Would the project still get priority?
• Process differences: Where do departments or sites handle the same processes differently, and could these differences become a problem during implementation?

Once you've gathered the answers, compare them across departments. Do responsibilities overlap or fall between teams? Do managers have different expectations? Are the same key employees needed by several parts of the project?

The real value of the assessment comes from putting these answers together. Individual departments may seem well prepared, while the gaps between them reveal risks that nobody has noticed.

Not every organisational question needs to be resolved before kickoff. What matters is that the critical risks are identified, enough people and time are available to address them, and leadership gives organisational readiness the same attention as technical readiness when assessing the factors and risks that could affect the project's success.

Extending ECC maintenance can be a rational financial and operational decision. Its value depends on what happens in the time it buys. If the organisation uses it to sharpen decision-making, settle business and IT ownership, and build internal knowledge and capacity, the later transformation starts from stronger ground. If none of that happens, leadership meets the same organisational problems at the end of the three years — inside a tighter schedule.

Avoiding that starts with an objective assessment of which organisational capabilities are already in place, where the strengths lie, and what still needs attention. An outside perspective can be valuable here, helping organisations identify risks and gaps that may be difficult to recognise when you're closely involved in day-to-day operations.

Sources And Methodological Notes

[1] SAP Support – Maintenance Strategy

[2] CIO, Grant Gross — "Nearly half of SAP ECC customers may stick with legacy ERP beyond 2027," 4 June 2025. Reporting on Gartner's estimates.

[3] Horváth — "Study shows SAP S/4HANA transformations rarely go as planned," 10 April 2025. Survey of 200 SAP-using companies (≥€200m annual revenue, ≥200 employees), fielded Q1 2025.

[4] SAP News, Stefan Steinle — "Navigating Your RISE with SAP Journey: Updates for SAP ERP Private Edition Transition Option," 4 August 2025

[5] Prosci — Best Practices in Change Management, 12th Edition. The 6× figure measures the relative weight of human/organisational versus technical factors in ERP benefit realisation, across different types of organisational change rather than ERP projects exclusively.

Gartner figures are earlier estimates published in 2025, not current measured customer numbers. Confirm specific maintenance entitlement and fees against your own contract and SAP product version. The 2031–2033 transition option is a separate cloud subscription, bringing its own technical, service and contractual terms alongside the move to SAP ERP Private Edition by the end of 2030.