CRM or ERP: differences and which one your SME needs

> Declaration of interest: BAI Business offers a management platform with a CRM and publishes this article. It is signed by Héctor Redondo, CEO and founder of BAI Business.

Today I want to talk about the question business owners ask most when they start putting their business in order: do I need a CRM, an ERP or both?

The short answer: the CRM stores your customers and their sales; the ERP stores your money and your operations (invoices, expenses, stock, team). They are not the same thing and, in an SME, they often overlap. What really hurts is not lacking one of the two, but having both with no connection between them.

The difference, in a table

	CRM	ERP
Looks towards	Outwards: your customers	Inwards: your business
Stores	Records, history, sales by stage, next actions	Invoices, purchases, expenses, stock, team
The question it answers	Who do I need to call and what did I promise them?	How much comes in, how much goes out and what is left?
You notice when it fails	A sale is lost	The stock or the quarter does not add up
Used mainly by	Whoever sells and serves	Whoever invoices, buys and collects

Where they overlap

The invoice shows it. It starts from a sale (CRM) and ends up in your accounting (ERP). If you make it in one program and the sale is in another, somebody copies the data. The same goes for the customer: the name and email on the record have to be the same as on the invoice. When the two live apart, invisible work appears: copying and checking.

What the INE says

According to Spain's National Statistics Institute (INE), 63.6% of companies in Spain with 10 or more employees and an internet connection use ERP software and 34.5% use a CRM (survey on ICT use in companies, first quarter of 2025, accessed on 11 October 2026). Most already organise their money; only one in three organises their customers. Data for companies with 10 or more employees; for those with fewer than 10, that INE release does not measure them.

How to decide which to start with

You do not have to choose forever. You have to choose where to start. Ask yourself these questions, in this order:

1. What am I losing today: sales or control? If you forget to reply or to call back, start with the CRM. If you do not know how much you earned this month, start with invoices and expenses.
2. How many times do I copy the same piece of data? If you copy it from one application to another, you need them to talk to each other before you need more features.
3. How many people will use it? A system used by one person can be simple; one used by a team needs permissions and task assignment.
4. Can I add the rest later without changing system? This is the one that saves the most: choose something that grows with you.

Imagine a hair salon with five people. Today it records appointments in one program, invoices in another, and the customers are on the owner's phone. What hurts most is two clients landing on the same time, and that is diary and customer record. Starting there and adding invoicing afterwards gives it more than building a full ERP. (An invented example, not a real customer.)

What we have built at BAI

This is exactly why we built BAI as a single platform, and I use all of it: the CRM, the catalogue, the receptionist, the task module, the calendar and the appointments. According to what we publish on the website, each customer has a single record and the appointment, the invoice and the review come out of that same record; with separate programs, the diary does not know what the chat says; at BAI, what arrives through the chat enters the diary by itself. The modules switch on one at a time: you start with what is most urgent and add the rest without changing system.

If what you do is an industry with its own production, a specialised ERP will serve you better than we can.

What to do now

Take a piece of paper and write down the three tasks you repeat most and which program you do them in. If some tasks go through more than one program, that is your priority.

To understand each piece on its own, read what a CRM is and what an ERP is. If you want to see how we put them together, look at BAI's management platform.

How we checked this

I read the INE figures directly in its press release (ICT use table by region, total row) on 11 October 2026. What I say about BAI comes from the published pages of our website. I wrote it with the help of artificial intelligence from the cited sources and from what we use at BAI; I sign it myself.

Sources

• INE, "Encuesta sobre el uso de TIC y del comercio electrónico en las empresas. Año 2024 - Primer trimestre 2025": https://www.ine.es/dyngs/Prensa/ETICCE20241T2025.htm (accessed on 11 October 2026). Percentages over companies with 10 or more employees and an internet connection.
• Description of BAI's platform: published page the management platform.