HR platform vs a custom-built in-house system
Building HR and payroll in-house or as an ERP module versus buying a platform: cost over five years, compliance maintenance and key-person risk.
Where A custom-built or in-house system stands
Some businesses build their own HR and payroll, often inside an existing ERP. It fits your processes exactly, because it was written for them, and there is no subscription line in the budget.
A custom-built or in-house system fits best when
Organisations with genuinely unusual processes, a permanent in-house development team, and the appetite to maintain compliance code indefinitely.
Aiden HR fits best when
Businesses that would rather have their developers working on their actual business than re-implementing tax slabs every July.
Side by side
| Aiden HR | A custom-built or in-house system | |
|---|---|---|
| Fit to your process | Configuration — rules are data, not code | Exact, by construction |
| Finance Act changes | Add a versioned slab set | A development ticket, every year, forever |
| Who maintains it | The vendor | Whoever wrote it — and their eventual replacement |
| Cost profile | Predictable subscription | Low visible cost, high ongoing maintenance |
| Key-person risk | None | Severe when the original developer leaves |
| Audit trail and history | Append-only by design | Whatever was specified at the time |
When not to choose Aiden
If your processes are genuinely unlike anyone else's and you have a stable development team, building can be the right call. Be honest about the five-year maintenance cost before choosing it — that is where in-house systems usually fail, not at launch.
Should we build our own HR and payroll system?
Building is defensible if your processes are genuinely unusual and you have a permanent development team. The cost that surprises people is not the build, it is maintaining statutory compliance and audit history for years afterwards — every Finance Act becomes a development ticket.
We compare approaches rather than named products. Any summary we wrote of another vendor would be out of date within months and unfair in the meantime — evaluate specific systems against the criteria here and ask each vendor directly.