Types of ERP systems: A complete guide to deployment, tiers, and examples

Key takeaways

• The global cloud ERP market is projected to reach US$110.26 billion by 2030, an 18% compound annual growth rate.¹ 

• Types of ERP systems fall into three groups: deployment model, business size tier, and industry focus. For businesses that pay and get paid in several currencies, ERP connectivity matters as much as hosting. 

• Airwallex integrates with ERPs including NetSuite, QuickBooks, Xero, Sage, Microsoft Dynamics 365 Business Central, and Odoo to sync multi-currency payments and spend data to the ledger.

A finance team that exports bank data into a spreadsheet at month-end and hopes the totals are accurate has usually outgrown its bookkeeping software. The next step is typically an enterprise resource planning (ERP) system, and choosing the wrong one is an expensive mistake. This guide covers three ways ERPs are classified, how they connect to the tools that move money, and how to choose the right ERP system and vendor.

What is an ERP system?

An ERP system is business management software that runs accounting, inventory, purchasing, payroll, and order management from one shared database.² Instead of a separate app for every department, a company gets a single source of truth.

What does an ERP system do?

An ERP connects departments to ensure that updates in one place show up everywhere. When a salesperson confirms an order, the system can allocate inventory, calculate the cost of goods sold, trigger a purchase request, issue the invoice, and post the accounting entry in one step. This connection eliminates duplicate data entry and gives leadership a live view of the company’s financial health.

How does an ERP system work?

Every transaction flows into a central database and unified general ledger, serving as the master record for every financial account. Each module handles one job, such as procurement or HR, but they all sync to the same database.

Modern platforms also use application programming interfaces (APIs), the connections that let separate software swap data automatically. With APIs, outside financial tools can send transactions straight into the ledger without manual retyping.

Why choosing the right ERP system is important

An ERP rollout is one of the costliest and riskiest technology projects for a business. An ill-fitting system could require heavy customization, workflow disruptions, and low adoption. The right fit speeds up month-end close, supports compliance, and gives decision-makers actionable data. 

What are the main types of ERP systems?

ERPs can be classified in three ways: 

1. By where they are hosted (deployment)

2. By business size (tier)

3. By how specialized the software is (industry). 

The table below puts all three side by side, with example vendors for each type.

Cloud ERP

A cloud ERP runs on remote servers managed by the vendor or a third party, and teams use it through a web browser. Mid-market companies typically get one up and running in about three to nine months.

Benefits

Cloud ERP skips the hardware and the permanent license, keeping upfront costs low. The vendor handles server maintenance, backups, and security patches, and provides automatic updates, helping finance teams stay current on compliance standards. Cloud ERP also supports AI capabilities and agentic automation, which vendors offer continuously to subscribers.³

Drawbacks

Cloud ERPs require a stable internet connection and ongoing subscription fees. Businesses also have less control over where data is physically held, which may not work for heavily regulated industries.

On-premises ERP

On-premises ERP runs on physical servers the company owns and maintains. The business buys a perpetual license and installs the software in its own data center.

Benefits

Companies with strict data residency rules appreciate on-premises ERP for controlling security, hardware, and upgrade timing. Because the business owns the license, the only ongoing costs are annual maintenance and support.

Drawbacks

Upfront bills can be steep for licenses, servers, and network hardware. On-premises ERP requires a dedicated IT team for security, backups, and major upgrades. Implementations often take more than a year.

Hybrid ERP

Hybrid ERP, often called a two-tier model, uses an on-premises system at headquarters with cloud systems at regional subsidiaries.

Benefits

Subsidiaries can set up a standardized, region-specific system quickly, without waiting for a multi-year rollout. Local teams record transactions in a simpler interface, and integrations send all records to headquarters on a set schedule.

Drawbacks

Two systems require two upgrade schedules and a set of connections to maintain. If one of those connections breaks, headquarters loses sight of the subsidiary’s data. 

Open-source ERP

Open-source ERP gives organizations access to the software’s source code, and many platforms let them add applications one at a time.

Benefits

Initial software costs are lower because there are no standard per-user license fees. Teams can build custom workflows and connect internal tools without waiting for the vendor to ship a feature.

Drawbacks

Free licensing often leads to high development costs. Engineers must configure the code, build the infrastructure, and maintain it. Without a commercial vendor’s support, the technical risks all fall on the business.

What are the types of ERP by business size?

Vendors group ERPs into three tiers based on target revenue, operational complexity, and functionality, ranging from Tier I for global enterprises to Tier III for small businesses.

Tier I ERP for global enterprises

Tier I systems are built for the largest global corporations. They manage complex supply chains, manufacturing, and financial data across many international subsidiaries. Rollouts can take several years, with IT teams implementing heavy customizations. Tier I examples are SAP S/4HANA and Oracle Fusion Cloud ERP.

Tier II ERP for mid-market companies

Tier II platforms target midsize companies that want cross-functional capabilities without the cost and complexity of Tier I. They offer strong analytics and modular functionality with manageable implementation timelines. Oracle NetSuite, Sage Intacct, and Acumatica are Tier II options.

Tier III ERP for small businesses

Tier III software serves small businesses that have outgrown basic bookkeeping tools but don’t need enterprise modules yet. These platforms focus on core processes such as accounting, billing, basic inventory, and payroll. They are affordable, work out of the box in the cloud, and need little IT support.

What are the types of ERP by industry?

Some ERPs serve every business, and others are built for one sector.

General ERP

General or horizontal systems support a wide range of business models. They usually have strong core finance and HR modules and plenty of room to customize, with implementation partners shaping the software around the company’s workflows.

Industry-specific ERP

Industry-specific, or vertical, systems arrive pre-configured with the workflows, compliance frameworks, and terminology of a particular sector. They reduce the need for expensive custom code.

• Manufacturing: Manages bills of materials, routes work orders, and calculates finished goods costs.

• Wholesale and eCommerce: Adds freight and duties to product costs and reserves inventory across sales channels.

• Professional services: Logs billable hours and records revenue as it’s earned.

• Life sciences: Supports FDA electronic signature rules and tracks batch expiration dates.

What modules do ERP solutions include?

Most ERP solutions share a set of core modules. Each one covers a single discipline while sharing data across the system.

• Financial management: Houses the general ledger, runs accounts payable and receivable, handles multi-currency consolidation, and produces financial statements.

• Inventory management: Tracks stock across warehouses, follows product movement, and automates reorders.

• Procurement: Generates purchase orders, manages vendor contracts, and matches vendor bills with delivery receipts to prevent overbilling.

• Human resources: Stores employee data, tracks attendance, runs payroll, and manages performance reviews.

• Customer relationship management (CRM): Tracks customer interactions before and after a sale, manages the sales pipeline, and handles support tickets.

How Airwallex works alongside an ERP system

An ERP is the system of record, but it doesn’t move money. Airwallex works alongside it as a global financial infrastructure layer, executing payments and syncing transaction data back to the ledger. A cloud ERP with a weak payments connection still requires manual reconciliation, which is exactly the problem the ERP was bought to solve.

ERP and accounting software integrations

Manual data entry creates errors and burns out finance teams. Airwallex accounting integrations automate that flow for NetSuite, QuickBooks, Xero, Sage, Microsoft Dynamics 365 Business Central, and Odoo.

During the NetSuite setup, for example, the integration copies the chart of accounts, subsidiaries, and tracking categories from NetSuite into Airwallex. Hourly bank feeds then run for each currency balance. When an employee photographs a receipt in the Airwallex app, it’s matched to the card transaction and posts to NetSuite coded to the right account. Learn more about how the NetSuite integration with Airwallex works in this detailed article. 

Multi-entity payments and spend in 20+ currencies

Paying overseas suppliers creates reconciliation challenges with tracking multiple currencies and FX fees. Airwallex multi-currency accounts simplify global money movement, letting businesses collect funds from 70+ countries and hold balances in 20+ currencies. When a foreign invoice comes due, the payment can come straight from the matching currency balance. A European supplier paid from a euro balance needs no conversion and incurs no FX fees.

Spend works the same way. Finance teams issue virtual and physical corporate cards with set spending limits, and receipts are captured as employees spend. This replaces manual expense reports and makes expense management much easier after ERP integration.

How to choose the right type of ERP system

To choose the right system, businesses should evaluate the processes needing automation, connectivity to existing systems, technical resources, costs, and the appropriate tier for their company size. The process is a multi-year commitment, which makes a structured approach worthwhile.

1. Map the processes that the ERP will run

Before scheduling vendor demos, stakeholders should decide on critical, uncompromised workflows. This process helps define how the business consolidates multi-entity financials and recognizes recurring revenue.

2. Match deployment to IT resources and data requirements

Teams should assess technical resources honestly. A company without a strong IT team benefits from picking a vendor-managed cloud system over an on-premises setup to avoid server upkeep. Organizations bound by strict data localization laws, such as government agencies, may still need physical on-premises control.

3. Pick the tier that fits size and growth plans

Functionality should match current revenue and a realistic five-year outlook. An 80-person company doesn’t need the custom work and multimillion-dollar scope of a Tier I platform. Teams should favor pre-built setups for their industry and pick the tier that fits their scale.

4. Check integrations with finance and payments tools

The ERP has to talk to the rest of the finance stack through reliable APIs or pre-built connectors. Finance leads should ask every vendor how deep its ERP integration goes with payments, FX, and spend tools. 

5. Compare total cost of ownership, not just license fees

The subscription is only part of the bill. ERP systems range from the low five figures for a small company to millions of dollars for a global enterprise, depending on users, modules, and deployment. Consultants, data cleanup, and integration setup add high costs too.

Best ERP system examples

US finance teams favor these five platforms:

• Oracle NetSuite: A popular cloud platform with venture-backed and mid-market companies. It handles multi-entity consolidation, multiple currencies, and complex revenue recognition rules.

• Microsoft Dynamics 365 Business Central: A modular cloud platform for midsize companies already in the Microsoft ecosystem. Its manufacturing and supply chain modules connect natively with Excel and Power BI.

• SAP S/4HANA: An enterprise platform for large global corporations. It handles huge data volumes and complex manufacturing, logistics, and multinational entity structures.

• Sage Intacct: A cloud financial management system built for finance teams. It’s known for multi-entity reporting in professional services, nonprofits, and software companies.

• Odoo: A flexible, open-source platform made of independent apps. Companies start with core modules such as accounting or inventory and add more as operations grow.

Frequently asked questions about types of ERP systems

What are the 4 types of ERP systems?

By deployment model, the four types of ERP systems are cloud, on-premises, hybrid, and open-source. Cloud systems run on vendor-managed servers, and on-premises systems run on company-owned servers. Hybrid systems pair headquarters software with regional cloud applications, and open-source systems give direct access to the source code.

What are the 3 common types of ERP?

By company size, the three common types of ERP are Tier I, Tier II, and Tier III. Tier I serves global enterprises with complex manufacturing and supply chains, and Tier II serves mid-market businesses that need cross-functional workflows. Tier III serves small businesses focused on core accounting and inventory.

Which type of ERP is best for a small business?

The best ERP for a small business is usually a Tier III cloud system. It needs little upfront IT investment, has no servers to maintain, and covers standard financials out of the box. That lets a small business launch quickly and affordably, then grow into more complex tools later.

What is the difference between cloud ERP and SaaS ERP?

All SaaS (software as a service) platforms are cloud-based, but not all cloud software is true SaaS. True SaaS uses a multi-tenant architecture, where customers share the same software version and infrastructure while their data stays isolated. A single-tenant legacy system hosted on a remote server is cloud software, but it lacks the automatic updates and built-in scalability of SaaS.

How much does each type of ERP cost?

Pricing varies widely with user count, modules, and deployment. Costs run from the low five figures for a small company to millions for a global enterprise. Budgets should cover total cost of ownership, including support, training, and integration work, rather than the license alone.

Sources

1. https://www.grandviewresearch.com/press-release/global-cloud-enterprise-resource-planning-erp-market

2. https://www.airwallex.com/en-us/blog/what-is-erp

3. https://global-mediator.com/cloud-erp-trends-2026