ROI timeline comparison, brownfield versus RISE.

The return on investment profile of brownfield S/4HANA and RISE with SAP differ in shape, not just in headline cost. Brownfield concentrates spend early, releases benefit late, and produces a relatively flat operating profile over the run period. RISE smooths spend across the contract, produces operational benefits earlier, and locks in a subscription cost that grows with renewal cycles. The honest comparison requires looking at the year by year cash flow of both paths against the operational benefits each delivers, and reading the timing of when value actually arrives. This article walks through the shape of each ROI curve, the years where the curves diverge, the sensitivity of the curves to operating model assumptions, and the way buyer teams should present the comparison to a board that wants to see when the investment pays back.

01.The shape of brownfield ROI

Brownfield ROI is back loaded. The migration itself consumes capital in years one and two, often in the range of fifteen to thirty million dollars for a global enterprise depending on the size of the estate and the complexity of the customisations being remediated. The benefits realised during those two years are limited because the platform is still being stood up and the new processes are not yet in production at scale.

Years three and four are the inflection point. The platform is in production, the new processes are operational, and the benefit pipeline starts to deliver. Operating cost reductions appear as the legacy environment is decommissioned, the maintenance load on the old platform falls away, and the new functionality enables process improvements that the old platform could not support. The cumulative cash flow turns positive somewhere in this window, typically in year three for the cleanest brownfield projects and in year four for the more complex ones.

Years five through seven are where brownfield earns its return. The platform is stable, the depreciation of the migration capital is largely absorbed, and the operating profile is lean. The benefits compound as the business adopts more of the new functionality and as the operations function matures around the new platform. The seven year cumulative ROI is often in the range of forty to sixty percent for a well executed brownfield programme, calculated against the migration cost.

The risk to the brownfield ROI shape sits in years one and two. If the migration overruns, the capital spend grows, the benefit realisation slides to the right, and the cumulative cash flow stays negative for longer. The board sees the cost early and the benefit late, which produces a narrative pressure on the programme that can lead to descoping decisions that erode the eventual ROI.

02.The shape of RISE ROI

RISE ROI is front loaded in benefit terms but flat in cost terms. The platform is operational from year one because SAP and the hyperscaler provide the foundation. The internal operations team is released from much of the basis and infrastructure work within months. The functional implementation work still takes time, but the underlying platform is producing value much earlier than the brownfield equivalent.

The cost profile is smooth. The RISE subscription is paid quarterly or annually across the contract term, typically seven years. There is an implementation cost in the early years for the functional build, but the capital intensity is much lower than the brownfield equivalent. The cumulative cash flow is negative across the early years because the subscription is being paid without yet realising full benefit, but the depth of the negative cash flow is shallower than the brownfield case.

Years three through seven are where the subscription model starts to compound against the buyer. The subscription is paid regardless of the realised value, and the contract typically includes year four and year six uplifts that grow the cost. The cumulative cash flow turns positive somewhere in this window, often in year four, but the ROI compounds more slowly than the brownfield equivalent because the cost continues to accrue.

The seven year cumulative ROI for a well negotiated RISE deal is often in the range of twenty to forty percent, lower than the brownfield equivalent but with a different risk profile. The risk in RISE is the renewal in year seven or year eight, where SAP holds significant leverage and the cost can step up materially if the buyer team has not preserved its negotiation position.

03.Year by year cash flow comparison

The clearest way to compare the two paths is a year by year cash flow table that shows capital spend, operating cost, realised benefit, and cumulative position for both paths over seven years. The numbers vary enormously by enterprise, but the shape is consistent.

Year one: brownfield is heavily negative because of migration capital. RISE is moderately negative because of subscription plus implementation. Year two: brownfield is still heavily negative because migration continues and benefits have not yet arrived. RISE is moderately negative for the same reasons. Year three: brownfield turns the corner as the migration completes and benefits begin. RISE continues a moderate negative as subscription continues against partial benefit. Year four: brownfield accelerates as benefits compound. RISE turns positive as benefits catch up with subscription cost. Year five through seven: brownfield compounds at a faster rate because the cost base is now low. RISE compounds at a slower rate because the subscription cost remains material.

The crossover point between the two cumulative curves is the key reference for the board conversation. For most enterprises, the cumulative cash flow of brownfield catches up to and overtakes RISE somewhere between year four and year five. The buyer team that wants to make the case for either path needs to anchor on that crossover point.

04.Where the timelines diverge

The two timelines diverge for reasons that go beyond pure cost. The brownfield path produces a permanent platform that the enterprise owns, depreciates, and operates. The RISE path produces an ongoing service that the enterprise consumes and pays for in perpetuity. The accounting treatment matters because brownfield ROI compounds against an asset base that diminishes over time, while RISE ROI is calculated against a subscription that grows over time.

The operational implications also diverge. Brownfield requires sustained investment in the internal operations function, including basis, security, and infrastructure capability. RISE absorbs much of that capability into the managed service, which simplifies the internal operating model. For enterprises that are stretched on operations talent, the RISE simplification has a value that does not appear cleanly in the cash flow table.

The risk profiles diverge as well. Brownfield risk is concentrated in the migration years one and two. Once the platform is stable, the run risk is low. RISE risk is distributed across the contract life, with the largest single risk being the renewal at year seven or year eight. The buyer team that prefers concentrated risk early may favour brownfield. The buyer team that prefers distributed risk may favour RISE.

05.Sensitivity to operating model

The ROI comparison is sensitive to the operating model assumed for each path. Brownfield ROI assumes an internal operations function that runs efficiently across the seven years. If the function is short staffed, dependent on hard to recruit specialists, or fragile in some other way, the operating cost of brownfield is higher than the model suggests and the cumulative ROI falls.

RISE ROI assumes that the buyer realises the benefits of the managed service rather than rebuilding shadow operations functions internally. Enterprises that take on RISE while continuing to staff a large internal SAP operations team realise less benefit than the model suggests and the cumulative ROI also falls.

The buyer team should run the ROI comparison at three operating model assumptions: optimistic, base, and pessimistic. The optimistic case shows the upper bound of value for each path. The pessimistic case shows the lower bound. The base case is the most likely outcome. The board should see all three because the decision is sensitive to which case proves accurate, and the buyer team should be candid about which case the enterprise is most likely to realise.

06.Presenting the comparison to the board

The board conversation about ROI is more useful when the comparison is shown as a timeline rather than a single number. A single seven year ROI percentage hides the cash flow shape that drives the board's intuition about the risk. A timeline chart shows the depth and duration of the negative cash flow, the timing of the crossover point, and the slope of the cumulative curve in the back years.

The board should also see the sensitivity bands. The base case timeline plus the optimistic and pessimistic envelopes shows the range of outcomes the enterprise might realise. A board that sees a wide envelope can ask the right questions about which assumptions matter most. A board that sees only the base case may not appreciate the risk distribution and may approve a path that has more variance than the board's risk appetite supports.

The buyer team should also present the qualitative considerations alongside the quantitative timeline. Operating model implications, talent considerations, transformation appetite, and strategic alignment all matter. The board should not be asked to make the decision on the timeline alone. The timeline is the input that anchors the quantitative side of the conversation.

Brownfield ROI is back loaded with concentrated migration risk. RISE ROI is smoother but compounds more slowly and faces renewal risk at year seven. The cumulative curves typically cross between year four and year five, and that crossover point is the anchor for the board conversation.

07.Conclusion

The ROI comparison between brownfield and RISE is not a single number contest. It is a comparison of cash flow shapes, of risk distributions, and of operating model implications across a seven year horizon. Brownfield produces a back loaded ROI with concentrated early risk. RISE produces a smoother ROI with distributed risk and a material renewal exposure at year seven. The cumulative curves usually cross somewhere between year four and year five, and where the curves end at year seven depends on operating model assumptions that the buyer team should disclose openly. The board that sees the comparison as a timeline with sensitivity bands makes a better decision than the board that sees only a single percentage. The buyer team's job is to present the comparison honestly, anchor the conversation on the crossover point, and let the board choose the path that fits the enterprise's risk appetite, talent profile, and strategic direction.