Fourteen months remain. On 31 December 2027, SAP ends mainstream maintenance for SAP ECC 6.0 (SAP Business Suite 7). No additional free extension, no sector-specific exception: the date has been confirmed and locked in for several years (erpresearch.com, SAP ECC 6.0 End of Support). Yet according to the DSAG survey from February 2026, 54% of respondents are still running ECC, with only 37% expecting to be live on S/4HANA before end of 2027 (SAPinsider, ERP Migration Benchmark 2026).
If you are reading this article from a production SAP ECC instance, you are part of this silent majority. This guide is not here to alarm you — it is here to help you choose, with clear eyes, among the three options available to you in October 2026.
Where Things Stand: The Real State of SAP Migrations in Late 2026
The Numbers: More Than Half of ECC Customers Have Not Migrated
The picture is stark. The SAPinsider 2026 benchmark, conducted across 296 organisations between December 2025 and March 2026, reveals that 55% have deployed S/4HANA, but only 34% have actually switched their daily operations to the new system (SAPinsider ERP Migration Benchmark 2026). In other words, between 45% and 66% of ECC customers remain operationally on the legacy system.
Across the DACH region and Central Europe, the DSAG — the German-speaking SAP user group — documents 54% of its members still on ECC at the start of 2026, with only 37% anticipating a go-live on S/4HANA before the deadline. Roughly half of the remainder are counting on paid extended maintenance through to 2030.
Why So Many Late Movers
Three structural causes explain this accumulation of delays, frequently combined within the same organisation:
The complexity of proprietary ABAP code. Mid-market industrial companies that deployed SAP ECC during the 2000s and 2010s have often accumulated dozens — sometimes hundreds — of Z-programs (custom developments outside SAP standard). Inventorying and remediating this code — a prerequisite for any migration — is a long and costly exercise that many organisations have deferred.
No decision at the C-suite level. S/4HANA migration projects require investments ranging from €500k to €2 million for a mid-market Brownfield engagement (mybusinessfuture.com), and up to double that for a Greenfield. This level of investment requires executive sign-off that, in many organisations, has been pushed back year after year.
The SAP consultant shortage. Approximately 20,000 to 25,000 legacy SAP customers still have their full migration ahead of them, all concentrated in the same 18-month window before the deadline (datavapte.com, SAP Consultant Shortage 2026). Daily rates for S/4HANA consultants have already risen 10–20% in 2026 and will continue climbing through 2027.
What SAP Has Confirmed: The Date Will Not Move
SAP has reaffirmed the 31 December 2027 date for the end of mainstream maintenance for SAP ECC 6.0 with Enhancement Packages 6, 7, and 8. After that date, SAP will no longer deliver standard bug fixes, legal and regulatory updates (including EU VAT e-invoicing mandates currently rolling out across multiple member states), or support packages under a standard maintenance contract.
Enhancement Packages 0 through 5 had already lost mainstream support at the end of 2025. If your instance is on an EHP below 6, you have already been outside standard maintenance for several months.
The 3 Options Available in October 2026
Option 1: Launch an Accelerated Migration to S/4HANA
This is the path SAP recommends, and the only one that fully eliminates accumulated technical debt. In practice, for a mid-market industrial company starting its project in November 2026, three approaches are viable depending on context:
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Brownfield (system conversion): Direct conversion of the ECC instance to S/4HANA via SAP SUM + DMO. Timeline: 9 to 15 months for a standard scope. Cost: €500k to €2M depending on the volume of Z-code to remediate. Advantage: transactional history is preserved. Limitation: technical debt migrates with you if it has not been addressed beforehand.
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Selective Data Transition (SDT): A hybrid approach that lets you choose which processes and data to migrate. Timeline: 15 to 24 months. Higher cost than Brownfield. Best suited for multi-entity groups with subsidiaries of varying age and complexity.
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S/4HANA Cloud Public Edition on a limited scope: For mid-market companies that cannot fund a full migration before 2027, deploying Finance (FI/CO) and the most standardisable modules provides a rapid entry point. Under 6 months on a minimal viable scope — but it does not cover the entire ERP footprint.
The real challenge over 12 months: A realistic fast-track requires a dedicated internal team (S/4HANA project manager, key users per module freed to at least 50%), an integrator available from January 2027 (increasingly hard to find), and a limited functional scope. Companies with a high rate of ABAP customisation or complex EDI integrations cannot realistically complete a full Brownfield in 12 months.
Worth noting: 60% of S/4HANA migrations have already exceeded their budget or schedule according to the SAPinsider benchmark. Starting in emergency mode multiplies that risk considerably.
Option 2: Subscribe to SAP Extended Maintenance Through 2030
SAP offers a paid maintenance extension for ECC 6.0 customers on EHP 6, 7, or 8: Extended Maintenance, available from 1 January 2028 through 31 December 2030. The cost: +2 percentage points on annual maintenance fees (erpresearch.com), raising the effective rate from approximately 22% to approximately 24% of net licences. In practice, initial SAP commercial proposals often come in above this rate — budget for a negotiation.
What Extended Maintenance covers: security patches, critical fixes, and some legal updates. New S/4HANA capabilities (AI, SAP BTP, SAP Joule), process innovations, and business function updates are not included.
What you are buying: three years of time — not three years of managed stagnation. The extension is a bridge, not a refuge. It provides the time to prepare migration properly — provided preparation genuinely starts in 2027 and not in 2029.
The real risk: Companies that subscribe to the extension without simultaneously launching their preparation will find themselves in 2030 in exactly the same position as today, with an even more acute consultant shortage and three additional years of technical debt accumulated.
Option 3: Use the Deadline as a Catalyst to Change ERP Vendor
For some mid-market companies, the SAP 2027 deadline is a trigger to question the choice of SAP itself. This is a legitimate option in specific cases:
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Companies with a high rate of Z-code (more than 60% of code outside SAP standard): if your ECC is so heavily customised that a Brownfield migration amounts to a full rebuild anyway, the trade-off between S/4HANA Greenfield and an alternative such as Microsoft Dynamics 365 Finance & Operations, Infor CloudSuite Industrial, or Odoo Enterprise deserves serious consideration.
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Companies whose functional scope no longer justifies SAP: A mid-market company of 200 employees using SAP ECC primarily for accounting and inventory management may find a solution better suited to its scale and budget.
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Groups that have undergone successive acquisitions: A heterogeneous portfolio with several ECC instances can be the opportunity to converge toward a more unified ERP landscape.
The critical trap: A migration to another vendor takes at least 12 to 18 months for a modular scope, and often 24 to 36 months for a full footprint. If you wait until 2027 to issue an RFP, you will be out of ECC support before you finish. This option is only realistic if scoping and vendor selection start immediately.
Decision Matrix: Which Option for Which Profile
| Criterion | Accelerated S/4HANA Migration | Extended Maintenance | Change ERP Vendor |
|---|---|---|---|
| Z-code rate | < 30% | > 50% (then migrate) | > 60% |
| Available budget 2027 | €500k – €2M | +2% maintenance/year | €400k – €3M |
| Functional ambition | Stay on SAP standard | Defer the decision | Re-engineer processes |
| Acceptable timeline | 9 – 18 months | 36 months (2030) | 24 – 36 months |
| Industry sector | Manufacturing, logistics | All sectors | Small mid-market, low SAP dependency |
| Consultant availability | Confirm immediately | Not critical | Confirm immediately |
For companies in regulated sectors (pharmaceuticals, financial services, critical infrastructure): remaining on unsupported ECC creates a non-negligible NIS2 and cyber-insurance compliance risk from 2028 onwards. European cyber-insurance policies increasingly exclude systems without active patching. This factor effectively shortens the acceptable timeline for most CIOs in these sectors.
The Critical Path: What Takes the Longest
Data Cleansing
Field experience consistently shows that data quality in ageing ECC instances is the most underestimated factor. Governance and cleansing workstreams take 6 to 18 months depending on the history of the system. A dedicated article on the ERP data migration 7-step methodology covers the profiling, cleansing, and validation phases to plan for in detail.
ABAP Inventory and Remediation
Before any Brownfield or SDT conversion, SAP mandates a compatibility analysis via the SAP Readiness Check tool. The tool generates a report of Z-objects incompatible with S/4HANA. For a mid-market company with 300 to 500 Z-objects, remediation typically takes 3 to 6 months of development work — assuming ABAP resources are available in-house or can be rapidly sourced externally.
Training and Change Management
S/4HANA fundamentally changes interfaces and some processes (simplification of database tables, end of classical parallel accounting, FI-CO unification). Key users require training that must be scheduled within the project timeline — typically 2 to 3 months before go-live, which places further constraints on a 12-month window.
Consultant Availability in 2027
This is the most critical external factor. According to analysis published by datavapte, the demand-to-supply ratio for S/4HANA consultants in Europe could reach 3:1 by mid-2027. Tier-1 SAP integration firms are actively closing out their 2027 calendars. If you have not contracted with an integrator before Q1 2027, the risk of finding no qualified resources at a reasonable budget is high.
What the Smartest Companies Are Doing Right Now
Run the Audit Before Choosing an Option
The first step is not to choose Brownfield or SDT — it is to understand the real state of your instance. An ERP pre-migration audit using an 8-step framework will qualify your functional scope, the state of Z-code, data quality, and third-party integrations. Without this audit, any migration business case rests on assumptions — and budget overruns are statistically guaranteed.
Secure Consultant Resources Now
The shortage is not abstract. SAP integrators that still have openings for 2027 projects are being selected right now. A letter of intent, even without an immediate start date, secures a calendar slot. Some firms offer framework agreements with deferred start dates.
Use the SAP Readiness Check
SAP provides the SAP Readiness Check tool free of charge to customers under active maintenance. It analyses your ECC instance in a matter of hours and produces a migration obstacle report. This report is the baseline document for calibrating budget and timeline — and for presenting to the board with factual data rather than generic estimates.
Prioritise Finance First
For mid-market companies that cannot mobilise a full project before 2027, migrating the Finance module (FI/CO/AA) is typically the fastest path: less custom Z-code, more standardised processes, and it closes the accounting compliance risk. It can serve as a first go-live on S/4HANA, with progressive migration of other modules across 2028–2029 under extended maintenance.
Next Steps and Useful Resources
For further reading, three complementary resources on this blog:
- SAP S/4HANA: Greenfield vs. Brownfield vs. Selective Data Transition — Decision Guide 2026-2027 — in-depth analysis of the three migration paths with a decision matrix
- ERP Pre-Migration Audit: The 8-Step Diagnostic Framework for CIOs — the protocol for assessing the real state of your instance before choosing your option
- ERP Data Migration: 7-Step Methodology from Cleansing to Validation — the most underestimated workstream in any S/4HANA project
And to go into your next board meeting with a structured decision tool: download our ERP evaluation grid — 100 criteria to benchmark migration scenarios side by side with weighted criteria.
