SAP Migration · 8 min read · July 2025
The 2027 SAP ECC deadline, and how much time you really have
By Thinklytics Partners, SAP S/4HANA Practice
SAP ECC mainstream maintenance ends December 2027. Support does not vanish that day, but the practical message is the same: start now.
Topics covered
- SAP ECC
- 2027 Deadline
- S/4HANA
- Migration Planning
Frequently asked questions
When does SAP ECC support end?
Mainstream maintenance for ECC 6 ends December 31, 2027. Optional extended maintenance runs to 2030 at roughly two extra points of fee, and older ECC releases already lost mainstream support in 2025.
Does support disappear in December 2027?
No. Mainstream maintenance ends, but paid extended maintenance is available to 2030, and a restricted private-cloud option exists for some large customers beyond that. The cost and the risk rise as the window closes.
How long does an S/4HANA migration take?
Typically 6 to 18 months for the mid-market and 18 to 36 months for large enterprises. Discovery and data cleansing alone consume about 40 percent of that time, which is why an early start matters more than the headline date.
How much does it cost?
Mid-market budgets run from a few hundred thousand into the low millions, while a large-enterprise greenfield build can reach eight figures. The biggest swing factor is data condition and custom code, not the license.
Why start now if the deadline is 2027?
Because capacity is tightening. Demand for S/4HANA specialists is near three times supply into 2027 and rates are up 30 to 50 percent, so a late start buys you junior people at premium prices. Starting early lets you choose your path and your partner.
How far along is everyone else?
By early 2026, legacy ECC use dropped below half of organizations for the first time and 59 percent of companies are fully or partially live on S/4HANA. The teams still in planning are mostly large, complex estates, about 35 percent of big enterprises.
What is the first step?
A readiness assessment that measures the real state of your data and custom code before you set a date and budget. It is the cheapest way to de-risk a large program.
Has SAP extended the deadline?
No general extension. The 2027 mainstream end stands, with paid extended maintenance to 2030 as the main relief valve.