The golden ratio for ERP maintenance cost: 1-2% of revenue per year
Under the reference framework recommended by S4, annual ERP maintenance cost, including system development, should be 1-2% of revenue. For companies with revenue of VND 500-2,000 billion (about USD 19-77 million), this equals VND 5-40 billion per year, covering subscription, cloud infrastructure, the internal ERP team, partner services, process improvement, integration, training and AI. The key point is that software fees are only a small part; most of the budget should go to people and continuous improvement.
This article explains why S4 proposes this ratio, which items the budget covers, how to allocate it by priority and why Acumatica’s subscription model without per-user fees frees up more resources for business value.
Why do you need a reference ratio for ERP maintenance cost?
Because many companies budget for ERP as a one-off project and are then surprised when operating costs in later years were never planned. After go-live, the system needs administrators, reporting improvements, new integrations, training for new staff and updates for regulations such as Circular 99/2025/TT-BTC, effective 1 January 2026. Without budget for this work, ERP quickly becomes expensive accounting software.
A revenue-based reference ratio helps the CEO and CFO answer the question “how much is enough” consistently year after year. As revenue grows, system capability must grow with it: more subsidiaries, more plants, more stores and more reporting requirements from banks and investors. The 1-2% ratio is a reference framework recommended by S4 based on consulting experience, not a standard published by an external organization, and companies should adjust it to their stage of development.
How much money is an ERP maintenance cost of 1-2% of revenue?
For companies with VND 500-2,000 billion in revenue (about USD 19-77 million), the corresponding budget ranges from VND 5 billion to VND 40 billion per year. The table below applies to all three industries in this campaign: construction, manufacturing and F&B chains.
| Annual revenue (VND billion) | 1% (VND billion) | 2% (VND billion) |
|---|---|---|
| 500 | 5 | 10 |
| 1,000 | 10 | 20 |
| 1,500 | 15 | 30 |
| 2,000 | 20 | 40 |
A level close to 1% suits companies with stable processes, few legal entities and a solid internal ERP team. A level close to 2% suits companies growing fast, expanding into multiple entities, preparing to raise capital or undergo international audits, or investing heavily in data analytics and AI.
Balance your ERP budget at 1-2% of revenue
S4 helps build a 5-year budget, compare subscription models and plan an improvement roadmap for VND 500-2,000 billion companies.
What items does the ERP maintenance budget include?
The budget includes the full annual cost of owning and developing ERP, not just license fees. Specifically:
- Subscription or license: fees for the ERP software and extension apps.
- Cloud infrastructure: with SaaS ERP this is usually included in the subscription; add storage and test environments if needed.
- Internal ERP team: key users in each department, system administrators and business analysts (BA).
- Partner services: post go-live support, advice on extending modules and localization updates for new regulations.
- Process and reporting improvement: management dashboards, consolidated reports and reports for banks and investors.
- Integration: connections to e-invoicing, banks, POS, e-commerce marketplaces, timekeeping systems and machines.
- Training: for new staff, retraining when processes change and advanced key user training.
- AI: AI assistants, automation, predictive analytics and new connection standards such as MCP.
A complete list prevents the budget from showing only software fees while people costs remain scattered across departments.
How should the 1-2% budget be allocated?
The principle is to prioritize people and improvement first, software fees last. A good system without people who understand the data and keep improving it will not create value. The priority order S4 suggests is: internal ERP team, process and reporting improvement, integration, partner services, training, AI and finally the subscription.
The table below is an illustrative example for a company with VND 1,000 billion revenue choosing a 1.5% level (VND 15 billion per year) and using Acumatica. These are not statistics; they only illustrate a way of thinking about allocation.
| Item (illustrative example) | Suggested share | Illustrative amount (VND billion) |
|---|---|---|
| Internal ERP team (key users, admin, BA) | 35% | 5.25 |
| Process, reporting and analytics improvement | 20% | 3 |
| System integration | 12% | 1.8 |
| Partner consulting and support services | 12% | 1.8 |
| Training | 6% | 0.9 |
| AI and automation | 8% | 1.2 |
| Acumatica subscription | 7% | 1.05 |
Actual shares depend on the company’s maturity. The first year after go-live usually needs more partner services; from the third year, the internal team and AI should take a larger share.
How much of the 1-2% budget does an Acumatica subscription take?
An Acumatica subscription takes only a small share. Based on S4’s quotation surveys for companies with VND 500-2,000 billion revenue, Acumatica’s annual cost is usually stable at about USD 20,000-50,000, or about VND 0.52-1.3 billion at a reference rate of about VND 26,000/USD. For a VND 1,000 billion company with a budget of VND 10-20 billion, this is roughly 3-13%.
The cost is stable because Acumatica charges by applications and resources used, not by number of users; in Vietnam, S4 offers a usage-based subscription model, so every package includes unlimited users. With per-user ERP, license costs rise with the number of accounts, which often forces labor-intensive businesses such as contractors, factories and retail chains to limit users. When software fees are stable, the rest of the budget can be focused on people, improvement and AI. A detailed comparison of pricing models is in our NetSuite vs Acumatica vs Business Central comparison.
How do you know if your company is spending too little or too much on ERP?
Signs of spending too little are a system that cannot keep up with the business: reports still built in Excel, double data entry, new regulations such as Circular 99 handled manually and no one accountable for data. Signs of spending a lot with poor results are a budget dominated by licenses and repeated customization while the internal team stays thin.
A simple check is to add up every ERP-related cost over the last 12 months, including salaries of people doing ERP work in each department, and compare the total with revenue. If spending is below 1% and the system is a bottleneck, increase targeted investment; if spending is close to 2% and results are unclear, review the cost structure.
How do localization and true cloud affect ERP maintenance cost?
Ready-made localization and a true cloud platform reduce hidden costs during the operating years. When Circular 99 accounting, social insurance and personal income tax in payroll, fixed assets and e-invoicing are part of a standard package that is updated regularly, the company does not have to maintain its own customizations. S4 provides Acumatica localization packages such as VN Financial Localization and VN Payroll, along with the NetSuite V2.0 accounting localization package.
True cloud removes the cost of servers, backups and version upgrades, which the vendor performs twice a year. The savings should be redirected to improvement and AI, as discussed in our article on true cloud ERP, AI and MCP. S4 Consulting - Acumatica Gold Partner in Vietnam and Oracle NetSuite consultant - can help companies build a 5-year budget using this framework.
Frequently asked questions
What should annual ERP maintenance cost be?
The S4 recommended reference framework is 1-2% of revenue per year for the full cost of owning and developing ERP.
Is 1-2% of revenue an international standard?
No. It is a reference framework recommended by S4 based on consulting experience; companies should adjust it to their stage of development.
Does the 1-2% budget include salaries of the internal ERP team?
Yes. It covers key users, admins and BAs, plus subscription, partner services, integration, training, reporting improvement and AI.
How much of the budget does an Acumatica subscription take?
Based on S4 quotation surveys, about VND 0.52-1.3 billion per year, roughly 3-13% of the VND 10-20 billion budget of a VND 1,000 billion company.
Which budget items should be prioritized?
Prioritize the internal ERP team and process and reporting improvement, followed by integration, partner services, training, AI and the subscription.
