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.
SAP ECC 6 mainstream maintenance ends December 31, 2027. Support does not vanish that day. Paid extended maintenance runs to 2030, and a narrow private-cloud option exists beyond that for some large accounts. The practical message is still the same: the cheapest version of this move is the one you start early.
- Dec 31, 2027 ECC 6 mainstream maintenance ends. Paid extended maintenance runs to 2030 at roughly two extra points of fee. Older ECC releases already lost mainstream support in 2025. The date is a planning input, not a cliff.
What the dates actually mean
Mainstream maintenance for ECC 6 ends at the close of 2027. After that, SAP stops shipping fixes, legal and tax updates, and standard support unless you pay for extension. Extended maintenance buys you to 2030 at roughly two extra points of fee. Older ECC releases already lost mainstream support in 2025. None of these dates stop the system from running. They are the points where your risk and your cost step up.
The SAP ECC support timeline
What each milestone actually changes for a running ECC estate.
| Milestone | Date | What it means |
|---|---|---|
| Older ECC releases end | 2025 | Pre-ECC 6 enhancement packs already off mainstream support. |
| ECC 6 mainstream maintenance ends | Dec 31, 2027 | Fixes, legal/tax updates, and standard support stop unless you pay for extension. |
| Extended maintenance ends | 2030 | The paid relief valve runs out. A narrow private-cloud option exists beyond it for some large accounts. |
Source: SAP maintenance roadmap, 2026.
Why waiting is the real risk
A full migration takes 6 to 18 months for the mid-market and 18 to 36 months for a large enterprise, and discovery and data cleansing alone consume about 40 percent of that timeline. Start after the middle of 2026 and you compress the program into the window when specialists are scarcest and rates are highest. Demand for S/4HANA talent is running near three times supply heading into 2027, and consulting rates are up 30 to 50 percent across the 2026-27 stretch. The calendar is not the constraint. Capacity is.
Where the installed base is, early 2026
Most of the market is already moving. The remaining third competes for the same scarce specialists.
- Fully or partially live on S/4HANA
- Large enterprises still in planning or exploration
- Migration projects running late or over budget
Source: Precisely/ASUG and PAC migration surveys, 2026.
Where the market already is
By early 2026, legacy ECC use fell below half of organizations for the first time, and 59 percent of companies are fully or partially live on S/4HANA, up 13 points from 2024. The teams still in planning are mostly the large, complex estates, about 35 percent of big enterprises, and they are the ones competing for the same shrinking bench. Being late is not only a scheduling problem. It means more junior people at higher rates.
The move that de-risks the rest
Treat the deadline as a planning input, not a panic trigger. The first dollar to spend is a SAP data readiness assessment that measures the true condition of your data and custom code before you commit to a date or a budget. That is the cheapest way to find the expensive problems while they are still cheap to fix. Our 30-day Analytics Truth Audit does exactly that, and it feeds straight into the SAP practice when you are ready to plan the move.
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.
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.