ECC support ends in 2027
Move from SAP ECC to S/4HANA before it moves you
Mainstream maintenance ends on Dec 31, 2027, migration to S/4HANA takes 12 to 18 months. Work backwards and it starts now.
Trusted by enterprises worldwide
The 2027 deadline, explained
Every SAP migration is really three projects: custom code, data, and the business carrying on while both happen. The date does not move for you.
Talk to an SAP ExpertSupport does not just stop
Mainstream maintenance ends in 2027. Extended support runs to 2030, at a premium.
Custom code is the long pole
Every Z-program and modification has to be assessed, remediated or retired first.
Your data sets the timeline
SAP data migration moves fast on clean master data. Most ECC landscapes are not.
Waiting narrows your options
Partner capacity tightens as 2027 nears. Late projects cost more and rush harder.
Inside an SAP S/4HANA migration
Nobody signs off an SAP S/4HANA migration on a benefits slide. These are the six things a steering committee actually argues about.
Partners in Innovation
What clients are saying
Why enterprises choose Accely
With 26+ years of SAP expertise, Accely helps enterprises move from ECC to S/4HANA with a structured, outcome-driven approach. Our global delivery capabilities help reduce migration complexity, protect business continuity, and accelerate value from the modern SAP landscape.
Reporting in real time
Live analytics on transactional data, so finance stops waiting for the nightly batch.
A lighter landscape
Retired custom objects and cleaner master data mean fewer things to break and patch.
Predictable spend
Scope, timeline and data quality on one dashboard from kickoff through to hypercare.
Faster month-end close
Universal Journal removes the reconciliation between ledgers that slows your close.
AI and automation
S/4HANA is the base layer for SAP Business AI, Eerly Studio, RPA and the tools you buy next.
Supported well past 2030
A release SAP is investing in, with innovation arriving instead of support expiring.
SAP ends mainstream maintenance for ECC in 2027, and good delivery teams book out first. Send us your version, custom code volume and target date. We map the path and the timeline.
Find your answers
What is the difference between greenfield, brownfield and bluefield? +
Greenfield is a clean build on standard S/4HANA, with processes redesigned and only the data you choose to bring across. Brownfield converts your existing system in place, keeping history and configuration. Bluefield is selective: new build where your processes are a mess, carried over where they work. Most enterprises assume brownfield is cheaper, then find their custom code decides for them.
How long does an SAP S/4HANA migration take? +
For most mid-size landscapes, 12 to 18 months from kickoff to go-live. Single-entity brownfield conversions can land in six to nine. Multi-country greenfield programmes run longer. The three variables that move the date are custom code volume, master data quality and how many legal entities go live in the same wave. Adding people late rarely recovers a slipped date.
Can the business keep running during the migration? +
Yes. Cutover is planned in waves rather than one weekend where everything changes at once, and each wave carries a fallback that has been rehearsed on your data. Month-end close, invoicing and shipping keep running throughout. The disruption people remember from ECC-era projects usually traces back to untested cutover plans, not to the migration itself.
Should we move to SAP cloud or stay on-premise? +
It depends on how much control you need and how you want to hold the cost. RISE with SAP and private cloud shift spend from capital to operating and hand infrastructure to SAP or a hyperscaler. On-premise keeps control and suits tight data residency rules or heavy customisation. We are partnered with AWS, Google Cloud and Azure, so the recommendation is not tied to one platform.
Will our custom code survive the move to S/4HANA? +
Some of it. We run a code assessment before any commitment, sorting custom objects into three buckets: now standard in S/4HANA, needs remediation, or unused and safe to retire. In most ECC landscapes a large share falls into that last group, quietly inflating estimates until someone checks. Knowing the split early is what makes a timeline real rather than optimistic.