Excel as an ERP system?

Excel is probably one of the most encountered “ERP systems” in Polish companies. The problem is that it was never designed to manage business processes, yet many organizations use it in exactly that way.

It does not require a costly implementation, is relatively inexpensive, flexible, and allows users to quickly create summaries, calculations, and reports. At the beginning of a company’s development, it is often entirely sufficient. It can be used to maintain customer lists, record orders, control costs, and prepare basic financial analyses. However, it is important to remember that Excel was created to work with data, not to manage complex business processes. Problems begin when it takes over the role of the company’s central operating system.

So when does Excel stop supporting business growth and start limiting it?

The turning point usually comes gradually. First, there is one spreadsheet for orders. Then another for inventory levels. The next one is used for cost control, and yet another for sales reporting.

Over time, the company operates based on dozen or even dozens of files connected through more or less formal dependencies.

Sales uses its own spreadsheet, the warehouse maintains separate records, finance has additional files, and management receives reports manually prepared from data gathered from various sources. Information must be copied between documents, updated in multiple places, and constantly checked for consistency.

In practice, this means the company has created its own informal ERP system based on spreadsheets. The problem is that there is no single source of truth. Each department may work with slightly different data, and the accuracy of information depends on employees’ manual actions.

In many organizations, this model works for years until the number of documents and users begins to grow rapidly. At that point, every additional person working with the files increases the risk of using outdated data, and the company ends up with a complex network of spreadsheets that becomes increasingly difficult to control.

According to IDC, more than 80% of business data ends up in spreadsheets at various stages of business processes. This demonstrates how important Excel is in day-to-day operations, but also how easily it can become an organizational bottleneck.

The point is not to choose between ERP and Excel.

Excel is excellent for analysis, financial modeling, forecasting, and one-off calculations. It enables quick work with data and the creation of customized reports.

An ERP system serves a completely different purpose. Its role is to manage processes that span multiple departments. For example, a single sales order can automatically update inventory levels, generate a sales document, trigger the invoicing process, and then be included in financial reports. Everything happens within a single process and a single database.

In practice, the ERP vs. Excel dilemma most often arises when a company increases sales, expands its warehouse network, or hires additional employees. Processes that could previously be handled manually begin to require automation and full control over information.

This is where the line is drawn. Excel is used to work with information. ERP is responsible for executing business processes.

Therefore, the question should not be “ERP or Excel?” but rather: which operational processes should be handled by an ERP system, and which can still be supported by spreadsheets?

The business consequences of using Excel as the primary management system can be significant.

The first issue is errors. A single incorrect formula or accidentally deleted cell is enough for reports to stop reflecting the company’s actual situation.

Another risk is data overwriting and lack of access control. The more people work on the same files, the greater the likelihood of information loss or unauthorized modifications.

A further challenge is the lack of a complete audit trail. In many cases, it is difficult to determine who made a specific change, when it was made, and on what basis a business decision was taken.

A good example is when a salesperson records an order in their spreadsheet while the warehouse uses a different version of the file. As a result, the customer is informed that a product is available when it is actually out of stock.

The consequences are very real:

• Delayed reporting
• Order errors
• Outdated inventory levels
• More difficult financial settlements
• Greater dependence on individual employees
• Limited ability to scale operations
• Decisions based on incomplete data

„The real problem begins when an organization tries to manage processes involving multiple departments and hundreds of documents per month in Excel. In such a model, every change requires additional work, and the risk of errors increases along with the scale of the business”.

Microsoft Dynamics 365 Business Central was designed specifically to connect dispersed processes in a single environment and provide businesses with an easy way to manage:

• Finance
• Sales
• Purchasing
• Inventory
• Projects
• Manufacturing
• Service
• Reporting

For example, a sales order entered into the system is immediately visible to the warehouse, finance department, and employees responsible for fulfillment. Inventory levels are updated automatically, and the data is available to all authorized users.

In the same environment, invoices, payments, purchase orders, product availability, and management reports are handled.

This eliminates the need to manually copy information between files and significantly improves data consistency across the organization.

As a result, the company gains a single source of data for all departments. This is the key difference between an Excel-based ERP model and a modern ERP system that automatically synchronizes information across processes.

Implementing an ERP system does not mean abandoning Excel. This is one of the most common myths associated with process digitalization.

Spreadsheets can still play an important role in the organization. They are ideal for analysis, custom reporting, quick calculations, and working with exported data.

The difference is that Excel stops being the place where business processes are executed. Instead of managing orders, inventory levels, or invoices, it supports the analysis of data coming from the ERP system.

This approach allows organizations to leverage the strengths of both tools without the risks associated with storing critical processes in spreadsheets.

In many organizations, the need for an ERP system emerges much earlier than management realizes.

• Employees use multiple versions of the same file
• Reports are prepared manually
• Data must be re-entered between systems
• Inventory levels do not match reality
• More and more processes depend on the knowledge of individual employees
• Preparing reports takes many hours or even days

We discussed this in more detail in our article: Why do you need an ERP system? If any of these situations occur regularly, it is worth analyzing whether the current operating model still supports the organization’s growth.

There is no specific number of documents or users after which a company should automatically implement an ERP system. However, there are clear signs that the current model is no longer effective.

It is worth considering this step if:

• more and more people use the same data,
• the number of orders and documents is steadily increasing,
• reporting requires manual consolidation of information from multiple sources,
• there are more and more process exceptions,
• the company uses many separate tools and integrations,
• data errors are starting to generate real costs,
• critical knowledge is stored in spreadsheets managed by individual employees.

Importantly, the first step does not have to be purchasing a system immediately. It is worth starting with an audit of processes and data to determine which areas truly need to be moved into an ERP environment.

If you are wondering whether Excel is still supporting your company’s growth or starting to limit its scalability, it is worth beginning with a discussion about processes. An analysis of the way your company operates can identify which areas should be moved into Microsoft Dynamics 365 Business Central and whether the time is right to implement an ERP system.