ROI for Small Business Investment
A simple way to decide if a business investment is likely to pay off.
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Whether you are buying software, running a marketing campaign, or hiring help, ROI (return on investment) gives you a quick way to compare options.
Simple formula
ROI % = (Net Gain ÷ Investment Cost) × 100
Net Gain = the extra profit the investment produces, not the extra revenue.
Why it matters
- Compares very different opportunities on the same scale.
- Prevents spending on things that look exciting but don't pay back.
- Helps prioritise when budget is limited.
Practical example
A small business spends €2,000 on a marketing campaign that brings in €5,000 in extra profit over the next year. ROI = (5,000 ÷ 2,000) × 100 = 250%.
How to interpret
- Positive ROI: the investment earned more than it cost.
- Negative ROI: it lost money — stop or change the approach.
- Always compare ROI to alternatives, not zero.
Next steps
- Use realistic estimates of net gain, not best-case revenue.
- Set a date to review actual results.
Open the ROI & Payback calculator →
This guide is for educational and planning purposes only. It is not accounting, tax, legal, investment, or financial advice.