At TMF Group, this risk became acute in 2024 when the existing payroll platform could no longer support UK and Ireland requirements at scale. The decision was made to migrate more than 400 clients onto a new platform: an initiative that introduced significant operational risk across multiple payroll environments.  

For Robert Evans, leading the programme, the challenge was not just to deliver a system change, but to do so while maintaining every payroll cycle, deadline and client expectation. 

Running transformation alongside live payroll delivery 

The operational context was defined by scale and constraint. The migration had to be delivered using existing business-as-usual resources, without pausing or reducing payroll operations.  

This created several pressure points: 

More than 1,000 parallel tests were required to validate the new system before full transition. Each test represented a checkpoint where errors could be identified, but also a potential delay if issues were not resolved quickly. 

The margin for error was minimal. Any failure would have affected multiple clients simultaneously, increasing both operational and reputational risk. 

Structuring delivery around control and communication 

The approach taken was grounded in disciplined governance and structured execution. Rather than accelerating migration at the expense of control, the programme was built around rigorous testing, validation and phased transition. 

Parallel testing became the backbone of delivery, ensuring that outputs from the new system matched existing payroll results before go-live. This reduced the risk of discrepancies and allowed issues to be resolved in advance. 

At the same time, communication played a central role. Clients were kept informed throughout the process, with clear expectations set around timelines and outcomes. This transparency helped maintain trust, even as significant changes were being implemented. 

Internally, alignment was reinforced through a restructured delivery model. The Cross Market Delivery Team was expanded to 70 full-time equivalents across four countries, creating a unified approach to service delivery regardless of location.  

This model emphasised consistency and quality, ensuring that all teams were operating to the same standards during and after the migration. 

Delivering change without disruption 

The outcome of this approach was a transition completed without interruption to payroll services. All clients were migrated successfully, with every implementation signed off defect-free.  

Operationally, the new platform improved efficiency and accuracy, reducing manual intervention and supporting a more scalable delivery model. This translated into stronger client relationships, with increased confidence in TMF’s ability to manage complex payroll environments. 

The commercial impact was also evident, with improved service quality contributing to revenue growth and higher client retention. 

Leadership that connects execution with culture 

A defining element of this transformation was how it combined technical delivery with team development. Alongside system change, Robert Evans focused on building capability across the organisation, introducing structured learning programmes and supporting career progression within the team.  

This ensured that the new operating model was supported by the skills and engagement required to sustain it. The emphasis on a people-first approach contributed to high morale and retention, reinforcing delivery stability during a period of change. 

Designing payroll transformation for continuity 

For payroll and reward leaders, the key lesson is that large-scale transformation must be designed around continuity from the outset. 

Three practical insights emerge from this example: 

This case shows that successful payroll transformation is not defined by the technology implemented, but by how effectively disruption is avoided. When leadership prioritises control, alignment and trust, even the most complex migrations can be delivered without compromising service.