Excel vs Power BI for Management Control

Almost every SME I meet runs its management control on Excel. And I get it: everyone knows it, it costs little and at the start it does everything you need. It works, until it doesn't. In this article I compare Excel vs Power BI honestly: where Excel really is enough, which limits of Excel you end up paying for at some point, and what changes in practice when you move to Power BI.

Let me say it upfront, to clear the air: this is not a contest with a winner. I use both, every week. The right question is not which tool is better, but which one fits the stage your business is at.

Where Excel works perfectly well

Excel has earned the place it holds. For plenty of situations it remains the right choice, and recommending anything else would be selling you smoke:

• Lists and master data. Customers, suppliers, price lists, simple inventories. A well-kept table does the job.
• One-off calculations. A quote, a pricing simulation, comparing two supplier offers. Open, calculate, close.
• A simple annual budget. Expected income and expenses over twelve months, reviewed each quarter. For many small businesses that is more than enough.
• Companies with little data. If you issue thirty invoices a month and have a single data source, an automated dashboard is a sledgehammer to crack a nut.

If you recognise yourself here, keep Excel and stop worrying about it. The problem starts when you ask it to do a job that isn't its own: becoming the monthly reporting system for the whole company, fed by hand by several people.

The 5 limits of Excel that SMEs pay for

These are the five problems I see most often when I start working on an SME's Excel-based management control. This is not theory: each one has a cost in hours and in francs.

• 1. The copy-paste ritual every month. Someone downloads the data from the ERP, pastes it into the file, fixes the columns, corrects the formats. Half a day a month, every month. At CHF 45 an hour that is more than CHF 2'000 a year spent just moving numbers from one place to another.
• 2. Silent formula errors. A cell overwritten with a hard-coded value, a sum that doesn't cover the latest rows added. The file doesn't warn you: it keeps showing a number, it's just the wrong one. I've seen the margin on a project overstated for months because a formula stopped at row 200.
• 3. A single owner of the file. Every company has "THE file", and one single person who really knows how it works. If they're on holiday, off sick or change jobs, management control stops with them.
• 4. No automatic refresh. The file shows the data from the last time someone updated it. So in mid July you're deciding on late May's numbers, and decisions always arrive a month late.
• 5. The file grows and slows down. Thirty sheets, chained formulas, references to other files. Every recalculation takes minutes, every opening is a gamble, and nobody dares touch anything anymore.

A concrete example. A company I worked with closed its monthly report in a day and a half: exports from the ERP, three Excel files to align, cross-checks by hand. A day and a half of a person who costs the company around CHF 400 a day comes to almost CHF 7'000 a year. Not to analyse the numbers: just to prepare them. And despite all that work, every now and then the totals still didn't add up.

What changes with Power BI

Power BI does a different job from Excel. It doesn't replace the spreadsheet: it replaces the manual work around the spreadsheet. In concrete terms, a Power BI dashboard for an SME changes four things:

• It connects to your sources. ERP, accounting, e-commerce and even the Excel files you already use. The data stays where it is, Power BI reads it.
• It refreshes by itself. The monthly copy-paste disappears. You open the dashboard and the numbers are last night's, not last month's.
• Same numbers for everyone. Owner, sales manager and fiduciary look at the same dashboard. No more meetings where two files say two different things.
• Drill-down from total to detail. Revenue is falling? You click and see in which product line, then which customer, then which month. With Excel that question costs you an afternoon of work.

And the cost? The licence is the small part: Power BI Pro costs around ten Swiss francs per user per month, and there is also a free version to get started. The real investment is the initial construction of the data model, a line of reasoning similar to the one I laid out in how much it costs to automate a process in an SME.

Excel and Power BI together: the realistic path

In practice, moving from Excel to Power BI almost never means abandoning Excel. The combination that works in SMEs is this: Excel stays for data entry and ad hoc analysis, Power BI becomes the monthly dashboard everyone looks at.

The typical path I follow with clients has three steps:

• 1. Clean up the sources. Understand where the data lives and tidy it up. It's the least glamorous part and the most important one.
• 2. A first dashboard with 5-6 KPIs. Revenue, margin, cash, collections, the top customers by margin. Small, but looked at every week.
• 3. Automate the data refresh. That way the dashboard lives on its own and nobody goes back to copy-paste.

This is the work I do in my management control and Power BI dashboards for SMEs service. If you want to dig into KPIs and structure, I've written a guide on how to set up management control with Power BI. And if you'd rather have a ready-made tool, with cash, sales and customers in one place, there's App AFianco.

When it makes sense to switch (checklist)

Five lines. The more boxes you tick, the more mature the switch is:

• Closing the month costs you more than half a day of manual work.
• The numbers in two files never match on the first try.
• Only one person knows how to use "THE file", and everyone knows it.
• You decide on data that is a month old, because nothing fresher exists.
• Someone copies data from the ERP by hand, every single month.

Zero or one tick? Stay on Excel, seriously. Two or more? The switch is not a luxury: it's time and reliability you're already paying for, just invisibly.

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Did you recognise yourself in the checklist? We start from the files you already have, clean up the sources and build the first dashboard around the numbers that matter. It's the heart of my management control and Power BI dashboards for SMEs service: write to me and we'll talk it through with no obligation.

Frequently asked questions

Is Power BI hard to learn for Excel users?

No. If you work well with Excel you already have the basics: tables, formulas, data logic. Reading a Power BI dashboard can be learned in an afternoon. Building the model behind it takes more experience, but it's a one-time job, often done with outside help.

How much does Power BI cost for a small business?

The Pro licence costs around ten Swiss francs per user per month, and there is also a free version to get started. The bulk of the cost is not the licence: it's the initial construction of the data model, which means cleaning up your sources and defining the right KPIs.

Can I keep using Excel alongside Power BI?

Yes, and it's the most common setup in SMEs. Excel stays for entering data and ad hoc analysis, while Power BI reads those files and turns them into the shared dashboard. You don't have to throw away anything you've built.

Do I need a server or does it run in the cloud?

It runs in the cloud: reports are published to Microsoft's Power BI service and viewed from the browser or your phone, with no server on your premises. If your data lives in local files, a small free component called the gateway refreshes the data automatically.

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