Business case
Five-year TCO model
TCO is one of the four mandatory conditions at gate G2, alongside PoC results, UAT and the risk register. This model converts every customisation into money and risk so the board decides on a common basis.
Model parameters
Change a parameter to see its effect on the five-year TCO immediately.
Implementation scenario
Year-one cost
4.27 B ₫
Licensing, implementation, platform and run
Recurring cost / year
3.17 B ₫
From year two onwards
Total over 5 years
16.9 B ₫
A reference framework, not a quotation
Cost structure by year
Implementation cost concentrates in year one; later years are mostly licensing, platform and run.
Scenario comparison
Total cost over 5 years with the same user count and customisation level.
- Lean — Business Central14.2 B ₫
- Base — BC + Sales + Power Platform16.9 B ₫
- Enterprise — Finance + Supply Chain25.2 B ₫
Customisation risk
Every non-standard item must be converted into TCO and risk before approval.
Above the recommended threshold of 45. Consider bringing requirements back to fit-to-standard or using an existing connector.
Saves 1.88 B ₫ in year one
Against a Big Bang rollout with no accelerator, thanks to the requirement catalog, reusable PoC scripts and the existing connector library.
Cost line detail
Amounts in million ₫. This is OLYM3's strategic reference framework, not a Microsoft Dynamics 365 quotation.
| Item | Group | Year 1 | Each following year | Note |
|---|---|---|---|---|
| Dynamics 365 licence — Full user | Licensing | 1.84 B ₫ | 1.84 B ₫ | 45 users × 3.4M ₫/month (reference estimate) |
| Dynamics 365 licence — Team member | Licensing | 360 M ₫ | 360 M ₫ | 120 users × 0.25M ₫/month |
| Standard implementation with the OLYM3 accelerator | Implementation | 620 M ₫ | — | Shortened by the requirement catalog and reusable PoC scripts |
| Customisation beyond standard | Implementation | 276 M ₫ | — | 6 extension/custom items |
| Customer-specific connectors | Implementation | 174 M ₫ | — | 3 connectors outside the existing library |
| Data migration and cleansing | Implementation | 120 M ₫ | — | Includes the data readiness gate before G1 |
| Azure, data and AI | Azure platform | 168 M ₫ | 168 M ₫ | App Service, Functions, Data Lake, AI Foundry, observability |
| OLYM3 Nexus subscription | Run & OLYM3 IP | 408 M ₫ | 408 M ₫ | Core + Insight + Flow + AI |
| Managed digital operations | Run & OLYM3 IP | 312 M ₫ | 312 M ₫ | Monitoring, control tower, continuous improvement |
| Maintenance of customisations | Run & OLYM3 IP | — | 81 M ₫ | 18% a year on the value of customisations and bespoke connectors |
| Total | 4.27 B ₫ | 3.17 B ₫ | Total over 5 years: 16.9 B ₫ | |