A defensible dynamics gp modernization roi business case. Hard cost-avoidance build-up (partner / ISV / SQL Server / infrastructure / licence / admin headcount), one-time migration cost, target Fusion run rate, productivity and AI upside accelerator. Fusion vs Business Central as alternative targets — modelled side-by-side.
CFOs don't sign off on hand-wavy 'transformation value'. A defensible dynamics gp modernization roi rests on hard cost avoidance from auditable invoice lines, with productivity and AI as named upside.
The strongest dynamics gp modernization roi cases at the CFO sign-off conversation are built from the bottom up on hard cost avoidance. Current GP partner support spend — auditable from invoice records. Current ISV subscriptions (Mekorma, Greenshades, Integrity Data, Rockton, Encore) — auditable from contracts. Current SQL Server and infrastructure cost — auditable from IT chargebacks. Current GP licence renewals. Current in-house headcount allocation to GP administration. Add it all up and a mid-market multi-company customer is typically running £200–400K/year just to keep GP operational.
Against that, a target Fusion run-rate of £140–275K/year (Fusion subscription plus lower partner support post-go-live plus minimal incremental cloud infrastructure) produces a £90–275K/year hard cost-avoidance run rate. Layer the one-time migration cost on top, work out payback month, and the dynamics gp modernization roi case lands at 18–30 month payback in nearly every mid-market multi-company scenario. Productivity gains from Fusion's modern UX and AI capability are layered on as a named upside accelerator — defensible in their own right but not load-bearing for the base case.
Equally important is the do-nothing scenario. GP mainstream support ended September 2025 and extended support runs through April 2031. The dynamics gp modernization roi case has to model the rising risk of running unsupported software, the diminishing partner / Dexterity / ISV cooperation as the lifecycle clock advances, and the operational impossibility of continuing post-2031. The do-nothing scenario gets materially worse year-over-year — which makes the Fusion migration case strengthen rather than weaken over the 5-year horizon.
Six cost-avoidance lines that compound annually plus three productivity / risk lines that layer on top.
Implementation partner ongoing support, customisation maintenance, Dexterity development hours, SQL Server admin services. Typical annual avoidance for mid-market multi-company: £40–120K/year.
Mekorma, Greenshades, Integrity Data, Rockton, Encore. Typical combined annual subscription for mid-market multi-company: £30–80K/year. Replaced by Fusion-native or successor third-party.
Dedicated SQL Server cores, application servers, SAN / storage allocation. Typical avoidance: £20–75K/year for mid-market multi-company.
Annual GP licence costs plus user CALs running under extended support. Typical avoidance: £15–40K/year.
0.5–1.5 FTE allocation for SQL Server / GP / eConnect / Dexterity / ISV admin. Fully-loaded cost: £40–150K/year. Net post-cutover avoidance: typically £25–100K/year.
Fusion UX vs GP screens saves 10–20% time per role. OTBI / BI Publisher replaces SmartList Builder. Embedded AI for invoice OCR, supplier matching, anomaly detection. Layered as upside accelerator.
Year-by-year cumulative net benefit for a typical 3–6 company mid-market customer with £280K project cost and £165K/year run-rate avoidance.
Project cost of £280K incurred. Partial-year avoidance of £85K from post-cutover quarter. Net negative position — the investment year.
Full annual run-rate avoidance of £165K kicks in. Partner contracts ended, ISV subscriptions lapsed, SQL Server / infrastructure decommissioned. Cumulative gap closing fast.
Year 2 avoidance of £165K layers on. Payback achieved in month 19–22 typical. Cumulative net benefit turns positive. Productivity gains compounding.
Year 3 avoidance layers on. Productivity and AI value starting to land in measurable form (faster close cycles, lower error rates, mobile expense / approval productivity).
Year 4 avoidance. By this point GP databases are in long-term cloud archive (sub-£5K/year), no GP licence cost, no partner cost, no ISV subscriptions, no SQL Server infrastructure.
Year 5 avoidance. 5-year cumulative net benefit lands at £520–850K typical. Plus productivity and AI upside layered on. Plus do-nothing scenario would have been operationally untenable post-April 2031 anyway.
Six comparison axes the dynamics gp modernization roi calculator models when both modernisation targets are credible.
Business Central typically has lower migration cost (Microsoft-to-Microsoft path has more pre-built tooling). Fusion migration cost higher but offset by higher enterprise capability ceiling.
Fusion strong: native multi-LE consolidation, advanced intercompany, GAAP / IFRS dual-ledger. Business Central limited: SMB-class multi-entity capability.
Fusion strong: deep localisations for major economies plus emerging markets, sophisticated tax and statutory reporting. Business Central decent for major economies, lighter elsewhere.
Both have AI roadmaps; Fusion's embedded AI suite is currently broader and deeper (invoice OCR, supplier matching, anomaly detection, AI agents).
Fusion strong for complex manufacturing, multi-tier supply chain, advanced PLM. Business Central capable for light manufacturing and distribution but ceiling lower.
Business Central is the natural choice if the rest of the customer's stack is Microsoft-aligned. Fusion is the natural choice for Oracle-aligned parents (post-M&A) or customers who have outgrown SMB-class capability.
A credible dynamics gp modernization roi calculation has three input layers and one output layer. Input layer one: current GP run-rate cost — partner support fees, ISV subscriptions (Mekorma, Greenshades, Integrity Data, Rockton), SQL Server licences and infrastructure, application server hosting, GP licence renewals, in-house GP admin headcount allocation. Input layer two: target Fusion run-rate cost — Fusion subscription per user, Fusion implementation partner support (lower than GP partner support post-go-live), incremental cloud infrastructure. Input layer three: one-time migration cost. Output layer: 3-year and 5-year TCO comparison, cumulative net benefit by year, payback month, plus productivity and AI value layered on top. The dynamics gp modernization roi calculator at Syntra ETL produces this in 30 minutes from a 15-question intake.
For a typical 3–6 company mid-market GP customer, the 3-year TCO comparison runs: GP status-quo at £900K–£1.5M (3 × annual run-rate of £300K–£500K including partner / ISV / infrastructure / licences / admin) vs Fusion at £700K–£1.1M (migration cost £280K + 3 × Fusion run-rate of £140K–£275K). Net 3-year benefit: typically £200K–£400K. The 5-year TCO comparison is more favourable for Fusion: GP at £1.5M–£2.5M vs Fusion at £980K–£1.65M, net benefit £520K–£850K. Productivity gains and AI value are typically layered on top as a separate accelerator. The dynamics gp modernization roi case strengthens materially over the 5-year horizon as the migration cost is paid down and the annual run-rate gap compounds.
Productivity gains in a dynamics gp modernization roi come from four sources. Fusion's modern UX vs GP's Dynamics-style screens saves time on common transactions — invoice entry, voucher entry, journal entry, master-data maintenance — typically 10–20% time saving per role. Fusion's embedded analytics (OTBI ad-hoc, BI Publisher pixel-perfect, Smart View Excel-tethered) replaces the SmartList Builder ecosystem with significantly less keystroke effort per query. Fusion's mobile-friendly interface means approvers, expense submitters and AP coders can work from anywhere. Fusion's embedded AI for invoice OCR, supplier matching, anomaly detection and approval routing eliminates manual steps. The aggregated time saving across finance / AP / AR / ops in a mid-market multi-company GP customer typically runs 15–30 hours/week, which the dynamics gp modernization roi calculator converts to a £-value at fully-loaded labour rates.
Both Fusion and Business Central are credible modernisation targets from GP. Business Central is Microsoft's direct successor product to GP and is the natural choice for SMB customers who want to stay in the Microsoft ecosystem; Fusion is the choice for customers who have outgrown SMB-class capability or are part of an Oracle-standardised parent organisation post-M&A. The dynamics gp modernization roi differs by target. Business Central often has a lower migration cost (the Microsoft-to-Microsoft path has more pre-built tooling and lower change-management cost) but a lower ceiling on enterprise capability — multi-org consolidation, advanced manufacturing, sophisticated localisations are harder. Fusion has higher migration cost but a higher enterprise capability ceiling. The Syntra ETL dynamics gp modernization roi calculator can model both targets side-by-side.
Yes — the lifecycle clock is one of the most important non-financial inputs to a dynamics gp modernization roi case. Customers running unsupported software past April 2031 face material regulatory risk (audit exception on use of unsupported production financial software), material security risk (no security patches), material partner-availability risk (Dexterity developer pool, ISV partner cooperation, customisation maintenance all wind down toward 2031), and material talent risk (GP admin and Dexterity skills are hard to hire by 2028 and effectively unhirable by 2030). The dynamics gp modernization roi calculator models a 'do-nothing' scenario alongside the Fusion migration scenario — and the do-nothing scenario gets materially worse year-over-year as the lifecycle clock advances.
For a defensible business case to a CFO, typically 60–75% of the dynamics gp modernization roi rests on hard cost avoidance (partner support, ISV subscriptions, SQL Server / infrastructure, GP licences, admin headcount) and 25–40% on productivity / AI value. The hard cost-avoidance lines are auditable from invoice records — they survive challenge from finance. Productivity value is more defensible the more it's broken into specific role / process pairs (AP invoice entry time × AP headcount × labour rate, for example) rather than top-down 'we'll be 20% more productive'. The dynamics gp modernization roi calculator at Syntra ETL favours the hard-cost-avoidance build-up because it produces a defensible base-case payback and treats productivity / AI as upside accelerator.
GP installations typically require dedicated or partial-allocation in-house headcount. A typical multi-company GP installation has 0.5–1.5 FTE allocation across SQL Server admin, GP application admin, eConnect / Web Services admin, Dexterity development support, ISV add-on administration and reporting maintenance — a fully-loaded cost of £40–150K/year. Post-cutover, most of this evaporates: Fusion is SaaS so there's no DBA work, Dexterity disappears, ISV admin disappears, SmartList Builder maintenance disappears. Some headcount shifts to Fusion administration (Fusion roles, security, FSM configuration changes) but at a lower allocation. Net in-house headcount cost avoidance in the dynamics gp modernization roi typically runs £25–100K/year for a mid-market multi-company customer.
Syntra ETL produces a defensible dynamics gp modernization roi business case in 1–2 weeks from a 15-question intake. The intake captures current GP company DB count, current partner support spend, current ISV subscriptions with renewal dates, current SQL Server / infrastructure cost, current GP licence cost, current in-house GP admin headcount allocation, target cutover window and target Fusion footprint. The output is a 3-year and 5-year TCO comparison, payback month, year-by-year cumulative net benefit chart, productivity / AI upside accelerator, and a Fusion-vs-Business-Central comparison if relevant. Consultant-led equivalents typically take 6–10 weeks and rarely produce a hard-cost-avoidance build-up that survives CFO challenge.
Complete our 15-question intake covering current GP run-rate cost, ISV subscriptions, partner support, SQL Server infrastructure, in-house admin headcount and target cutover window. We will return a 3-year and 5-year TCO comparison, payback month, year-by-year cumulative net benefit chart and Fusion-vs-Business-Central comparison within 1–2 weeks.