SAP HCM to Cloud migration: what it really means for HR and Payroll leaders

Vincent Beaupérin: "SAP HCM, Human Capital Management, is the on-premise HR and Payroll management system that thousands of companies, often large corporations or mid-sized enterprises, have been using for years to manage their workforce: payslips, contracts, absences, working time…

'On-premise' means the software runs on the company's own servers, or those of a dedicated hosting provider. It is a legacy architecture, as opposed to the cloud. It is a robust, tried-and-tested system, but SAP has announced the end of support for the end of 2027: in less than two years, it will no longer receive technical or legal updates.

This is therefore a topic that directly affects HR Directors, Payroll Managers and IT Directors at every company still using this solution — and there are still a great many of them."

"SAP has confirmed the end of standard support for SAP HCM On-Premise on 31 December 2027. The deadline is firm. After that date, there will be no more security patches, no more automatic legal updates. Every change to employment law or collective agreements will have to be handled manually.

According to the latest SAP data (2024), more than 8,000 companies are still using SAP HCM On-Premise without having planned their migration. The urgency is real, and the question is no longer 'should we migrate?' but 'how do we migrate intelligently, without disruption and on time?'"

"There are several categories of identified risk, and all of them are serious:

• Regulatory risk first: without automatic legal updates, the company is exposed to payroll errors, URSSAF audits, and penalties. Everything will have to be handled manually, and we all know how complex compliance is today. It is simply unmanageable.
• Operational risk next: HCM systems are often heavily customised, and therefore fragile. The departure of a single internal expert can be enough to paralyse the entire payroll process.
• HR and employee experience risk is also very real: accurate, on-time pay is the foundation of the trust contract between employer and employee. Recurring errors immediately damage the employee experience, we've all seen it happen.
• Finally, financial risk: companies that wait are facing cost increases of 20 to 40%, due to the scarcity of expert resources available during periods of peak demand. The longer you wait, the more expensive and the riskier it becomes."

"Two main options exist:

• Option 1, SAP SuccessFactors (EC + ECP): the target trajectory. This is the cloud-native solution recommended by SAP, with an active roadmap beyond 2040, integrated AI innovations and automatic legal updates. If you go down this route, you are fully secure.
• Option 2, SAP S/4HANA (H4S4): an interim step. It enables rapid migration (3 to 4 months) that secures continuity in the short term, but it is not a final destination: you will need to migrate to SuccessFactors regardless. SAP is very clear on this.

For payroll in particular, Arago recommends in the vast majority of cases a Lift & Shift approach, i.e. a migration in 12 weeks. We migrate the existing system rather than rebuilding from scratch: this reduces risk, preserves configurations and accelerates the project. It is the ideal option if you do not wish to overhaul all your processes immediately."

"The benefits are real for everyone:

• For Payroll teams: data is reliable upstream of calculation, with far fewer manual re-entries and checks. The Payroll Control Center integrated into SAP SuccessFactors enables continuous supervision of the process, not just at month-end. Anomalies are detected in advance thanks to AI. The goal: by the time the payslip is produced, the team is in verification mode, not correction mode.
• For HR and managers: consistent data throughout the employee lifecycle, more legible processes and an improved employee experience.
• For IT teams: a gradual exit from complex on-premise architectures, fewer interfaces to maintain, and alignment with SAP cloud standards.

And in concrete terms, the AI assistant Joule allows employees to retrieve their payslips in seconds, and to ask questions about their leave or pay in natural language, without going through the HR department. It is a simple example, but it illustrates very well what the platform delivers."

"AI is already embedded in the platform, notably through Joule, SAP's AI assistant, and it is far from a minor feature:

• On the Payroll side, the Payroll Control Center uses AI to detect anomalies upstream of calculation: an unusual salary variation, an unprocessed absence, a missing uplift, before it becomes an error on the payslip.
• On the employee side, Joule allows employees to retrieve a payslip, ask a question about their leave or pay in natural language, directly within SuccessFactors, without going through HR.
• On the HR and manager side, predictive analytics make it possible to anticipate risks, turnover, overload, payroll budget, rather than simply noting what happened after the fact.

What fundamentally changes is this: we move from a system that records what has happened to a system that helps anticipate and decide what needs to be done. That is a genuine qualitative leap compared with SAP HCM On-Premise."

"Yes, there is still time, provided you act now. Between scoping, partner selection and the migration itself, a company that starts today can still aim for a go-live before the end of 2027. It is entirely achievable.

SAP itself advises against targeting 2027: the peak in demand will saturate available resources. It is better to get ahead of it.

The concrete first step is an S2C Readiness Check : an analysis of the existing SAP HCM environment (configurations, customisations, interfaces, data) to identify the most appropriate path and estimate costs before making any commitment. At Arago, we offer this initial assessment report free of charge. It is the right entry point for objectively assessing complexity without taking on any risk."

"Arago has been a Gold SAP Partner since 2010, with a rare dual expertise: we know SAP HCM from the inside, and we have full command of the SuccessFactors suite. These are two very different worlds, and this dual competence allows us to truly secure the transition.

We offer a packaged solution called Success2Cloud (S2C), covering Payroll, Core HR and Time Management, with preconfigured tools and templates that significantly accelerate the project.

The goal: to help companies not merely endure this migration, but to turn it into a transformation lever, modernising their tools, empowering their teams and approaching the future with far greater confidence."