A practical guide to building the business case for SAP S/4HANA migration, covering costs, ROI, benefits, risks, and strategic value for UK businesses.
For a UK enterprise, the case for moving to SAP S/4HANA should not be built around a technology upgrade alone.
An S/4HANA programme can require significant investment in software, implementation, data, integrations, testing, change management, infrastructure, and internal resources. The business case therefore needs to demonstrate something more important than technical readiness:
Why should the organisation invest in changing its ERP platform now, and what measurable business value will the investment create?
This is particularly important for organisations still running SAP ERP 6.0. SAP states that mainstream maintenance for the latest three enhancement packages of SAP ERP 6.0 runs through 31 December 2027, followed by optional extended maintenance through 31 December 2030. SAP also maintains its innovation commitment for S/4HANA through 2040, with at least one S/4HANA release in maintenance at any given time.
The maintenance timeline can be an important business driver, but it should not be the entire business case.
A stronger case connects:
Business Strategy + Current-State Costs + Transformation Benefits + Migration Investment + Risk + Future Value
The objective is to demonstrate not only that the organisation needs to change, but that the proposed S/4HANA transformation is the right investment compared with the realistic alternatives.
A weak business case often looks like:
Legacy SAP → S/4HANA → Modern Technology
That is not enough to secure a major enterprise investment.
A stronger business case answers six questions:
The final business case should allow executives to compare:
Stay as Is
vs.
Optimise Existing SAP
vs.
Migrate / Transform to S/4HANA
This is more credible than assuming the migration decision has already been made.
The strongest S/4HANA business cases begin with business strategy.
Typical drivers for a UK enterprise may include:
For example, a UK manufacturer may not need S/4HANA simply because its ERP is old.
It may need a new ERP strategy because:
The business case should connect the ERP problem to the business problem.
Instead of:
“We need S/4HANA because SAP ERP is approaching the end of mainstream maintenance.”
Use:
“We need to modernise our ERP platform to support the business strategy, reduce operational and technical risk, standardise critical processes, and establish a sustainable platform for future growth.”
The maintenance timeline then becomes one of the supporting factors.
Before calculating the value of migration, establish what the organisation is spending and how the current SAP environment performs.
This baseline should cover four areas.
Measure:
Measure:
Measure:
Measure:
Without this baseline, the organisation risks making claims such as:
“S/4HANA will reduce costs.”
without knowing what those costs actually are today.
One of the most important improvements to an S/4HANA business case is to model the cost of staying.
The alternative to migration is not zero cost.
A legacy SAP environment may continue to generate:
For SAP ERP 6.0 EHP6–8, mainstream maintenance ends on 31 December 2027, followed by an optional extended-maintenance phase through 31 December 2030.
This means the business case should model several scenarios.
Include:
Include:
Include:
This creates a much more credible comparison.
A comprehensive business case should not put every potential benefit into one “ROI” number.
Separate value into clear categories.
Examples:
Examples:
Examples:
Examples:
Examples:
Not every benefit should be converted into a financial figure.
Some should remain explicit strategic or risk-adjusted benefits.
This is where many ERP business cases become much stronger.
Instead of saying:
“S/4HANA improves efficiency.”
identify a measurable business process.
Current:
Financial close = 10 business days
Target:
Financial close = 7 business days
Potential value:
Current:
40% of incoming payments require manual intervention
Target:
25%
Potential value:
Current:
Manual purchase-order processing = 30 minutes per transaction
Target:
20 minutes
Potential value:
10 minutes × annual transaction volume × loaded labour cost
Current:
Manual exception handling = 1,500 hours annually
Target:
900 hours
Potential value:
600 hours × loaded labour cost
The business case becomes much more credible when benefits are tied to actual operational baselines.
The cost model should be significantly broader than the implementation partner's proposal.
A comprehensive cost model should include at least:
| Cost Category | Examples |
| Assessment | Readiness, discovery, architecture |
| Software | SAP subscriptions / licences where applicable |
| Implementation | Functional and technical delivery |
| Data | Cleansing, mapping, migration, reconciliation |
| Custom Code | Analysis, remediation, redevelopment |
| Integration | Interface redesign and testing |
| Infrastructure | Cloud, hosting, environments |
| Testing | Functional, integration, regression, performance |
| Change Management | Training, communications, adoption |
| Internal Resources | Business SMEs and IT staff |
| Programme Management | PMO, governance, architecture |
| Cutover | Migration rehearsals, downtime, go-live |
| Hypercare | Additional support after go-live |
| Decommissioning | Legacy SAP and related systems |
| Ongoing Operations | AMS, cloud, support, monitoring |
The organisation should also include contingency for material risks rather than assuming the initial implementation estimate is the final investment.
The initial migration investment is only one part of the financial model.
Compare:
Infrastructure + Support + Development + Interfaces + Security + Contractors + Operational Inefficiency
with:
Subscription / Licensing + Cloud + Support + AMS + Enhancements + Internal Team + Governance
Then calculate:
Total Cost of Ownership = Transformation Investment + Ongoing Operating Costs
over an agreed planning horizon, for example:
5 years or 7 years
The planning period should reflect the organisation's actual investment strategy.
A migration may have a high initial cost while producing lower operating costs over time.
Conversely, a cloud ERP programme may shift costs from capital expenditure to recurring operating expenditure without necessarily lowering total cost automatically.
The business case should therefore focus on total economic value, not on one cost category.
A basic ROI calculation can be expressed as:
ROI = (Total Benefits − Total Investment) ÷ Total Investment × 100
But enterprise ERP projects need more than one percentage.
Track:
Total Quantified Benefits − Total Transformation Cost
How long does it take for cumulative benefits to recover the initial investment?
For larger programmes, calculate Net Present Value over the agreed investment horizon.
For more sophisticated investment cases, calculate the Internal Rate of Return.
Compare the total cost of the current environment with the target S/4HANA environment.
This gives finance leadership a more complete picture than a single ROI percentage.
Not every benefit should be treated as guaranteed savings.
These can usually be measured directly.
Examples:
These may create substantial value without appearing as direct P&L savings.
Examples:
Do not turn every strategic benefit into a speculative cash figure.
Instead, assign:
Value + Measurement Method + Confidence Level
For example:
| Benefit | Measurement | Confidence |
| Reduced support effort | Support hours / month | High |
| Faster close | Days to close | High |
| Better planning | Forecast accuracy | Medium |
| Faster market entry | Days to launch | Medium |
| Better decision-making | Management reporting cycle | Medium |
This makes the business case more credible.
Avoid unsupported assumptions such as:
Published customer examples can be useful benchmarks, but they should not automatically become forecast results for another organisation.
SAP publishes customer and solution material showing benefits from S/4HANA and cloud ERP, but outcomes depend heavily on the implementation, scope, operating model, adoption, and starting point.
For an internal business case, use:
Current Baseline → Target → Measurement Method
rather than generic industry percentages.
One of the less obvious S/4HANA benefits can come from process standardisation.
A UK enterprise may have:
The migration creates an opportunity to establish:
Global Process Standard
with:
Approved Local Variations
This can reduce:
For organisations with acquisitions or multiple business units, this can be one of the most important strategic benefits.
A stronger business case also quantifies improvements that sit outside the ERP core.
Measure:
Measure:
S/4HANA transformation may provide an opportunity to rationalise and redesign these areas.
The value should be attributed to specific changes rather than automatically attributed to “S/4HANA”.
Every major SAP transformation carries risk.
The business case should therefore model:
Base Case + Downside Case + Upside Case
Assumes expected implementation cost and benefit levels.
Assumes:
Assumes:
This gives executives a much better understanding of the investment range.
One of the most commonly missed elements is the cost of waiting.
Delaying an S/4HANA programme can have both positive and negative effects.
Potential benefits of delay:
Potential costs:
For UK organisations on SAP ERP 6.0 EHP6–8, maintenance timing is another factor to incorporate into this analysis. SAP's current strategy provides mainstream maintenance through 2027 and optional extended maintenance through 2030.
The business case should therefore compare:
Migrate Now
vs.
Migrate Later
rather than simply:
Migrate vs. Do Not Migrate
Executives are more likely to trust a business case when they can see the alternatives.
Consider at least four scenarios.
Minimal transformation.
Pros:
Cons:
Targeted technical and process improvements.
Pros:
Cons:
Modernise while retaining significant existing configuration.
Pros:
Cons:
Build a new target architecture.
Pros:
Cons:
The business case should compare all options that are genuinely feasible.
The business case should become the baseline for value realisation.
Choose KPIs from several categories.
The exact KPI set should reflect the business case, not become a generic dashboard.
A business case should not end when the project is approved.
Assign each expected benefit:
For example:
| Benefit | Owner | Baseline | Target | Measurement |
| Financial close | CFO / Finance | 10 days | 7 days | Close calendar |
| Manual AP effort | Finance Ops | 100% baseline | -25% | FTE / hours |
| Interface incidents | IT | 200 / quarter | <100 | Service management |
| Duplicate vendors | Procurement | 4,500 | <500 | Master-data report |
| Support cost | CIO | £X | £Y | Annual operating cost |
| User adoption | Business | 0% | >90% | Usage data |
This transforms the business case from an investment document into an operating framework.
One of the costs most often underestimated is the period when the organisation is running the existing SAP environment while building and deploying S/4HANA.
For large UK enterprises, the transition can create temporary costs such as:
These costs can become material even when the final S/4HANA operating model is more efficient.
The business case should therefore model:
Current-State Operations + Transformation Run Costs + Target-State Operations
rather than comparing only:
Current-State Cost vs. S/4HANA Cost
Suppose a business normally spends £4m per year operating SAP.
During a two-year transformation, it may additionally require:
£1.2m annual transformation and transition costs
while still paying most of the existing operating cost.
Those costs do not necessarily indicate that the programme is inefficient.
They are part of the economic reality of the transition.
Create a detailed transition cost curve showing:
This makes cash requirements and payback much more realistic.
A board-ready business case should normally contain:
A useful process is:
Assess → Quantify → Compare → Model → Validate → Approve → Measure
Understand the current SAP and business environment.
Measure costs, inefficiencies, technical debt, and business impact.
Evaluate realistic alternatives.
Build financial scenarios and benefits.
Test assumptions with finance, business, IT, SAP specialists, and implementation partners.
Present the investment case to the appropriate governance body.
Track benefits against the baseline after implementation.
For UK organisations still operating SAP ERP 6.0, the timing of business-case development should reflect the actual system release and maintenance position.
SAP's current strategy provides mainstream maintenance for EHP6–8 of SAP ERP 6.0 through 31 December 2027, followed by optional extended maintenance through 31 December 2030. SAP's S/4HANA innovation commitment runs through 2040.
For a UK enterprise, the practical sequence is:
Document:
Establish:
Compare:
Stay → Optimise → Transform
Establish:
Model:
Connect the investment decision to:
This creates a decision framework rather than simply an implementation budget.
“Real-time analytics”, “AI”, and “cloud” are capabilities.
They are not automatically business benefits.
Without current-state data, projected savings are difficult to validate.
Legacy support and technical debt are real costs.
Strategic benefits should be clearly distinguished from direct financial savings.
Training, business participation, testing, and organisational change require real investment.
Dual running, backfill, temporary infrastructure, and hypercare can materially affect the financial model.
A credible case should also consider optimising the existing SAP landscape where appropriate.
Published customer results are not guarantees.
Business value needs to be tracked after the system is operational.
Maintenance deadlines matter, but the investment should be connected to the organisation's broader strategy.
Before seeking final approval, confirm:
LeverX can support UK enterprises from the initial SAP assessment through S/4HANA strategy, migration planning, implementation, and ongoing optimisation.
Potential activities include:
The objective is to create a business case grounded in the organisation's actual SAP landscape, costs, priorities, transition requirements, and transformation goals rather than relying on generic ERP assumptions.
Discuss Your SAP Transformation Business Case with LeverX
Because an S/4HANA transformation requires significant investment and organisational change. The business case provides a structured way to evaluate strategic benefits, costs, risks, alternatives, and expected returns.
At minimum: current-state assessment, strategic objectives, migration options, target state, investment costs, benefits, TCO, financial analysis, risks, implementation roadmap, transition costs, and benefits-realisation KPIs.
A basic formula is:
ROI = (Total Benefits − Total Investment) ÷ Total Investment × 100
For larger programmes, also consider NPV, payback period, IRR, TCO, and sensitivity analysis.
Separate benefits into:
Cost Reduction + Operational Efficiency + Risk Reduction + Growth Enablement + Strategic Value
This prevents strategic benefits from being incorrectly presented as guaranteed financial savings.
Include current infrastructure, support, maintenance, custom development, integrations, security, specialist resources, technical debt, and any applicable future maintenance costs.
For SAP ERP 6.0 EHP6–8, SAP currently states that mainstream maintenance ends on 31 December 2027, with optional extended maintenance through 31 December 2030.
Yes, where they apply to the organisation's actual SAP release and commercial situation. However, maintenance should be treated as one business driver rather than the sole reason for transformation.
There is no universal figure. Cost depends on the source system, migration approach, custom code, data, integrations, business-process scope, deployment model, testing, and organisational change.
Yes. If the organisation will operate the existing environment while building or rolling out S/4HANA, the business case should include temporary support, infrastructure, project backfill, parallel testing, hypercare, and other transition costs.
There is no universal payback period. It should be calculated from the organisation's actual investment, benefits, implementation timing, and ramp-up assumptions rather than using a generic benchmark.
They should be included in the overall business case, but not necessarily converted into artificial financial savings. Strategic benefits can be tracked using operational or business KPIs.
At minimum:
Stay on Current SAP + Optimise Existing SAP + S/4HANA Transformation
Where realistic, also compare different S/4HANA transition approaches such as system conversion, selective data transition, and new implementation.
Each benefit should have an owner, baseline, target, measurement method, and target date. This turns the business case into a benefits-realisation framework rather than a document used only to obtain approval.
Building a business case for SAP S/4HANA migration is not about proving that S/4HANA has more capabilities than the current ERP.
It is about demonstrating that changing the ERP creates enough strategic, operational, financial, and risk-adjusted value to justify the investment.
For UK enterprises, the strongest business case combines:
Current-State Baseline + Cost of Staying + Future Business Requirements + Migration Options + Investment + Quantified Benefits + Transition Costs + Risk + Benefits Realisation
The maintenance timeline can create urgency for organisations still running relevant SAP ERP 6.0 releases, with mainstream maintenance for EHP6–8 ending on 31 December 2027 and optional extended maintenance available through 31 December 2030. But urgency should support the business case rather than replace it.
The strongest decision is not:
“We need S/4HANA.”
It is:
“We have compared the realistic alternatives, quantified the investment and value, modelled the transition, assessed the risks, and demonstrated why this transformation is the right choice for our business.”
That is the foundation for an S/4HANA programme that can secure executive approval and remain accountable for measurable business value after go-live.
Discuss Your SAP Transformation Business Case with LeverX
Disclaimer: SAP product capabilities, maintenance timelines, deployment options, licensing, migration approaches, and technical requirements may change by product edition, release, configuration, and customer scenario. Any financial models, ROI calculations, benefit assumptions, or business outcomes should be based on the organisation's own baseline and validated assumptions. This article provides general information and should not be treated as a financial, procurement, or migration recommendation.