What is ERP? A plain-English guide for small businesses

ERP (enterprise resource planning) is software that keeps a company's core records (clients, sales, invoices, purchases, stock, accounting and staff) in one shared database. Every team works from the same numbers, so an invoice you send updates revenue, stock and the books at the same time.

The name sounds like something only factories and banks use. In practice, any business that sends invoices, buys from suppliers and pays people is already doing "resource planning". The only question is whether it happens in one system or in ten spreadsheets.

What ERP means in plain words

Think of a small company that sells and installs air conditioners. In one week it:

• sends an offer to a client, who accepts it
• orders units from a supplier and receives them into the warehouse
• sends a technician in a company van to install them
• issues the invoice and gets paid
• pays the technician's salary at the end of the month

Without ERP, each step lives in a different place: offers in Word, stock in Excel, the van's mileage in a notebook, invoices in an invoicing app and salaries with the accountant. Somebody has to copy numbers from one place to the next, and mistakes creep in.

With ERP, the accepted offer becomes the invoice, the invoice takes the units out of stock, the payment is matched to the invoice, and the accountant sees everything without asking for files.

What an ERP system does

An ERP is a set of modules that share the same data. Most small businesses use some of these:

You can see the full list of what Clientlly covers on the features page.

ERP vs. separate apps

Many small businesses start with one app per job: an invoicing app, a spreadsheet for stock, a separate payroll service. That works until the business grows. Here is how the two approaches compare:

Signs your business needs an ERP

You do not need an ERP because you reached a certain size. You need one when the manual work starts to cost more than the software. Typical signs:

1. 1You type the same client, product or price into more than one tool.
2. 2Answering "who owes us money?" takes more than a few minutes.
3. 3Stock in the system does not match what is on the shelf.
4. 4Month-end closing with your accountant takes days of collecting files.
5. 5Only one person knows how the spreadsheets work.
6. 6You cannot see sales or cash while away from the office.
7. 7You hire more people, and leave, attendance and payroll become a separate headache.

If three or more of these sound familiar, you have outgrown spreadsheets. Our article on Excel vs. business software goes through each sign in detail.

What an ERP costs a small business

There are two very different worlds:

• Traditional ERP is installed for large companies by consultants. Projects take months, and the implementation often costs more than the licences.
• Cloud ERP for small businesses is paid as a monthly subscription, runs in the browser and on phones, and is set up by the business itself in days.

When comparing prices, look at the whole picture: the subscription, how many users are included, whether modules such as inventory or payroll cost extra, and how much time it takes to set up. Clientlly's plans are listed on the pricing page, with no per-invoice fees.

How to choose an ERP: 8 questions to ask

1. 1Does it speak your language and your clients' language? Invoices and offers should go out in the language the client reads.
2. 2Does it know your country's VAT rates, currency and invoice rules? See our guide to VAT rates, registration and e-invoicing in the UK and Europe.
3. 3Can you start with a few modules and switch on more later without migrating again?
4. 4Is there a real mobile app for approvals, expenses and checking sales on the go?
5. 5Can you import your existing data (clients, products, opening balances) from Excel or CSV?
6. 6How are permissions handled? A salesperson should not see payroll.
7. 7Can your accountant get access without you exporting files every month?
8. 8What happens to your data if you leave? You should be able to export it.

How to switch without stopping the business

Moving to an ERP does not have to be a big-bang project. A simple plan that works for most small teams:

1. 1Pick a start date, ideally the first day of a month or quarter.
2. 2Import clients, suppliers and products from your current files.
3. 3Enter opening balances: unpaid invoices, stock quantities and bank balances.
4. 4Issue all new invoices from the new system from the start date.
5. 5Keep the old files read-only for reference, and close the first month together with your accountant.

Our migration guide explains each step and what to prepare.

Where Clientlly fits

Clientlly is an ERP built for small and medium-sized businesses. Invoicing, expenses, inventory, accounting, HR, attendance, fleet and reports share one database, in eight languages and with local VAT rates and currencies. You can try it free for 14 days without a credit card.