Practical decision guide
How to calculate the ROI of custom business software
By DEVTom · Published · Reviewed
There is no universal ROI percentage for custom software. Calculate it by comparing measurable benefits with the full cost of ownership over the same period. Benefits can include reduced administrative work, fewer preventable errors, faster reporting, avoided subscriptions and improved capacity. Costs must include discovery, implementation, migration, training, hosting, maintenance and future changes.
Formulas
ROI (%) = (Total benefits − Total cost of ownership) ÷ Total cost of ownership × 100
Payback period in months = Initial implementation cost ÷ Average monthly net benefit
Benefits and costs
| Benefits to measure | Costs to include |
|---|---|
| Administrative hours | Diagnostic and design |
| Duplicate entry and error correction | Development or configuration |
| Reporting delay | Data migration and integrations |
| Avoided subscriptions or workarounds | Training and rollout |
| Capacity gained | Hosting, support and maintenance |
| Earlier project or labour-cost visibility | Internal management time and enhancements |
Illustrative example — editable, not a client result
Assume an initial implementation cost of $40,000, two-year operating and change costs of $20,000, and measured two-year benefits of $90,000. TCO is $60,000; illustrative ROI is ($90,000 − $60,000) ÷ $60,000 × 100 = 50%. If average monthly net benefit after operating cost is $2,500, illustrative payback is $40,000 ÷ $2,500 = 16 months. Replace every value with validated business data. This is not a DEVTom client result or a guaranteed outcome.
Practical measurement
- •Record the baseline before implementation.
- •Separate cash savings from capacity that may or may not be converted into revenue.
- •Avoid counting the same benefit twice.
- •Use the same time horizon for benefits and costs.
- •Revisit assumptions after the pilot and rollout.
When custom software is not justified
Do not proceed when benefits cannot be tied to a material workflow, a standard product offers a lower-risk fit, or the organization cannot fund maintenance and change. A negative or uncertain result is a useful diagnostic outcome.
Where DEVTom can help
DEVTom’s TCO assessment helps document the present cost, plausible benefits, first-version scope and lifecycle costs without promising a universal return.
Source
Government of Canada guidance groups software TCO into up-front implementation, ongoing maintenance and support, and upgrade or transition costs. Open First white paper
Related services and field evidence
Frequently asked questions
What is a good ROI for custom software?
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There is no universal benchmark. Use the organization’s approved hurdle rate, risk tolerance and alternatives, based on measured benefits and full lifecycle cost.
Start with the operational problem
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