10 Mistakes to Avoid When Choosing an HRIS Software Vendor

1. Letting the demo drive the decision
2. Treating integration as a technical detail
3. Over-customising before you go live
4. Underestimating change management
5. Failing to secure C-suite buy-in early enough
6. Choosing a platform your deskless employees can't use
7. Digitising the problem instead of solving it
8. Overlooking the vendor's long-term roadmap
9. Skipping reference checks - or doing them too late
10. Treating selection as a one-time event

What happens: Vendors are skilled at showcasing their platforms in ideal conditions. The data is clean, the workflows are simple, and the scenarios are carefully chosen. It's easy to come away from a polished demo feeling confident – and then discover six months into implementation that the system handles your actual complexity very differently.

This matters more at scale. A 600-person organisation with ten pay groups, multiple site locations, and a mix of salaried and hourly workers has needs that a standard demo is unlikely to cover. 

How to avoid this mistake: Rather than letting vendors set the agenda, provide each shortlisted supplier with identical real-world scenarios based on your most complex use cases – and see how the technology can solve admin challenges and improve the experience. As Philippa Barnes, Director at ReThink HR, puts it in our Make your HR Tech Investment Count webinar:

"You don’t necessarily want to recreate your existing processes in the new system. You need to ask why each step exists and whether it's still relevant." The demo should answer your questions, not the vendor's.

What happens: Integration tends to be treated as a technical detail to be resolved after the commercial decision has been made. In practice, it's one of the most consequential factors in whether a platform actually works for your organisation – or becomes yet another system your team has to work around.

When HR, payroll, workforce management and learning don't share data, someone ends up bridging the gap manually. That's how you end up with a sophisticated HR platform and a spreadsheet sitting next to it.

How to avoid this mistake: The real question isn't whether a vendor can integrate with your existing systems – most will say yes. It's how that integration actually works in practice. A well-built API connection means data flows automatically between systems without anyone having to touch it. But it's worth asking vendors to be specific: is the API connection live and active with customers today, or is it on the roadmap? Some vendors talk confidently about API capability in the sales process but rely in practice on scheduled data exports or CSV uploads that still require someone to verify accuracy at the other end. At 500+ employees, that kind of hidden manual overhead compounds quickly – and it's exactly the admin burden a new platform was supposed to eliminate. Ask to see the integration working or to speak to a customer that’s using it.

What happens: When organisations have spent years building processes around a legacy system, there's a strong instinct to replicate those processes exactly in the new one. This is understandable – change is disruptive, and people want certainty. But it's also one of the most common reasons implementations take longer than planned and cost more than budgeted.

Over-customisation at the point of implementation often locks organisations into yesterday's processes, negating much of the value the new system was supposed to deliver.

How to avoid this mistake: Before signing off on any configuration decisions, ask a simple question for each process: why does this step exist, and is it still relevant? Use the implementation as an opportunity to redesign, not just replicate. Vendors who push back on this conversation (who are happy to customise anything you ask without challenge) may not be the long-term partner you need.

What happens: Technology selection and change management are regularly treated as separate workstreams. The platform gets chosen, implemented, and launched – and then the real work begins: persuading people to actually use it.

At 500+ employees, different teams, different levels of digital confidence, different managers with different attitudes to new systems can all impact adoption. A platform that 30% of your workforce ignores because it wasn't introduced properly has delivered 30% of its potential value.

"People can be switched off really easily if your systems aren't giving you what you need and it means it's a poor experience in whatever vein – whether that's your learning and development or your onboarding process. When you've got something that makes sense and is logical and it all looks and feels the same, it's easy to maintain." - Zoe Wilson, Director, ReThink HR

How to avoid this mistake: Build your change management plan before you go live, not after. Identify your champions in each business area early. Involve managers and employees in testing, not just the HR team. And look for a vendor with a structured approach to implementation that treats adoption as a shared responsibility, not something HR manages alone after handover.

Change management doesn't end at go-live either. The organisations that get the most from their HR platforms tend to have an account manager who proactively brings new features to their attention, helps them drive engagement over time, and supports them in evolving how they use the platform. If a vendor's post-implementation support amounts to a help desk and an annual review, it's worth asking whether that's enough.

What happens: Building the business case isn’t always done right at the start of the selection process, meaning Finance and IT are asked to validate a direction that HR has already invested significant time in exploring. With the best intentions, this can create friction rather than alignment, and occasionally derail projects at the point of final approval.

The scale of that challenge is worth acknowledging. According to Gartner, buying groups for complex purchases typically range from five to sixteen people across multiple functions. In a large organisation, that could mean HR, Finance, IT, Procurement, Legal and the board all need to reach alignment – often with different definitions of what success looks like.

How to avoid this mistake: Map your internal stakeholders at the very start of the process. Understand what Finance needs to see (ROI, total cost of ownership, payback period), what IT needs to know (integration requirements, security standards, hosting approach), and what the board cares about (risk, compliance, competitive positioning). Weaving their priorities into your plans early makes the final approval stage a formality rather than a hurdle. 

It also helps to anchor your business case in wider organisational goals from the outset – not just what HR needs today, but where the business is heading. A platform that supports current processes but can't scale with growth plans, structural changes or evolving compliance requirements will create problems further down the line. 

What happens: HR software selection is typically driven by the HR team and assessed through the lens of what works at a desktop. But for organisations with significant numbers of frontline, shift-based or deskless workers – manufacturing, healthcare, retail, logistics – a platform without genuine mobile functionality isn't just a poor experience; it's effectively unusable for a large proportion of the workforce.

The result: self-service that only works for office-based employees, a high volume of queries sent directly to the HR team, and engagement data that reflects a fraction of the actual workforce.

How to avoid this mistake: Test mobile functionality as thoroughly as desktop. Ask to see the app – not a screenshot of it, but a live demonstration on an actual mobile device. Check that time-sensitive tasks like clocking in, requesting leave, and accessing payslips work intuitively on mobile. And ask vendors directly what proportion of their customer base uses their mobile offering, and what the adoption rates look like. For Livv Housing Group's Director of Business Improvement, Guy Corbett, mobile functionality was a priority when selecting their platform:

"It was more advanced in comparison to the others. It's user friendly, has a great interface, and we knew instantly that rolling out the mobile app across the business would be hugely successful."

What happens: This is arguably the most expensive mistake of all, because it's the hardest to spot until it's too late. An organisation replaces a broken manual process with a digital version of the same broken process. The admin burden doesn't reduce; it just moves from paper to a screen. Employees are still entering the same data in multiple places. Managers are still chasing the same approvals. HR is still running the same reports manually, just in a different system.

This tends to happen when requirements are defined by listing current activities rather than desired outcomes.

How to avoid this mistake: Define what success looks like in terms of outcomes, not features. Instead of 'a system that manages absence', think: 'managers can approve leave requests in under two minutes from any device, and HR can see absence trends in real time without pulling a report.' Outcome-based requirements make it much harder for a vendor to promise something their platform can't deliver.

What happens: The platform that meets your needs today may not be the one that meets your needs in three years. Organisations with growth plans, potential M&A activity, or significant regulatory exposure – like the Employment Rights Act's 28 reforms currently being phased in – need a vendor whose product is evolving in the same direction they are.

Buying a platform based solely on current capability is a common mistake at a stage when HR technology is moving particularly fast. According to Fosway Group, Europe's leading HR industry analyst, much of what vendors currently market as AI capability remains on the roadmap rather than live with customers, making it critical to understand the difference between what a platform does today and what it promises to do eventually.

How to avoid this mistake: Ask vendors to walk you through their product roadmap – specifically what's live with customers now, what's in preview, and what's further out. Look for transparency rather than polish. A vendor with a Living Roadmap that shows exactly where capabilities sit in the development cycle, and allows you to test new functionality early, gives you far more useful information than a glossy feature list.

What happens: References are often treated as a formality – a quick call with a pre-selected happy customer at the end of the process. At this stage, they rarely change anything. The commercial decision has been made; references are used to confirm it.

But reference checks done properly, and earlier in the process, are one of the most valuable sources of information available. An organisation that has lived through implementation at similar scale, with similar complexity, will tell you things no demo ever will.

How to avoid this mistake: Request references from organisations comparable to yours in size, sector and complexity. And do it earlier in the process, before you've made an emotional commitment to a preferred supplier. Structure the conversation around the questions vendors don't tend to volunteer answers to: What took longer than expected? What would you do differently? How responsive has support been since go-live? What does the account management relationship actually look like day to day? Our guide to asking the right questions of HR software vendors covers the conversations worth having in detail – including what to ask references, and what their answers should tell you.

What happens: Once a platform is chosen and implemented, many organisations essentially stop evaluating it. Years pass, the business evolves, and the system quietly falls further behind the organisation's actual needs, until the gap becomes so painful that a full replacement feels like the only option. This cycle – implement, tolerate, replace – is expensive and disruptive. 

How to avoid this mistake: Build a regular review cadence into your HR technology governance – annually at minimum. Check that adoption is where it should be across all employee groups, that the vendor is delivering against their roadmap commitments, and that your organisation is making use of capability that's already available. A genuine technology partner should welcome this conversation and proactively bring new features to your attention. If you find yourself discovering functionality that's been live for months without anyone flagging it, that's a signal worth acting on.

Getting internal approval for a new HRIS platform at scale requires more than a feature comparison. Here's a straightforward framework:

Step 1: Quantify the cost of your current situation 

Before you can make the case for change, you need to put a number on the status quo. How many hours per week does your team spend on manual processes that could be automated? What does first-year attrition cost your organisation? What's the compliance exposure of your current system's limitations? These figures make the case in language Finance understands.

Step 2: Map requirements to outcomes, not features 

A list of features is easy to dismiss. A set of outcomes tied to business priorities – reduced admin burden, faster reporting, improved manager visibility, and Employment Rights Act compliance – is much harder to argue against.

Step 3: Build the stakeholder map before you build the deck 

Know what each decision-maker needs to hear before you put a single slide together. Finance wants ROI. IT wants integration clarity and security assurance. The board wants risk mitigation. HR wants capability and usability. One deck rarely serves all four.

Step 4: Define success metrics upfront 

What will good look like twelve months after go-live? Agree these metrics before implementation begins – not after – so there's a shared baseline for measuring return on investment. For guidance on the full journey from recognition to implementation, our Moving Up the HR Tech Stack guide, developed in partnership with ReThink HR, is a practical place to start.

Choosing the right HR software vendor is one of the most consequential decisions an HR leader will make, directly impacting team capacity, employee experience, and ultimately business growth. The organisations that navigate it well tend to share a common approach: they ask the right questions early, involve the right people sooner, and stay focused on outcomes rather than features throughout.

Access PeopleXD Evo brings together HR, payroll, talent, learning, workforce management and employee benefits in one intelligent platform – built for the complexity of mid-to-large organisations, with transparency that shows you exactly what's live today and what's coming next.