Shared Services and F&A outsourcing are often spoken about as if they are the same thing. They are not. Both models aim to bring efficiency, standardization, and governance to scalable finance operations, but they do so in fundamentally different ways, at fundamentally different costs, and with fundamentally different implications for an organization at different stages of its growth journey.
Choosing between them or deciding how to sequence them is a very critical structural decisions a finance leader makes. With the right choice, finance becomes a scalable, governed platform that supports growth without adding complexity.
This blog sets out the core differences between the two models, the growth stage at which each delivers the most value, and the sequencing logic that the most effective finance transformations follow.
What a finance Shared Services model means and what it requires
A Shared Services Center is an internal delivery model.
It is a centralized finance function, typically in a lower-cost location, that serves multiple business units, entities, or geographies from a single governed structure. Processes are standardized, technology is consolidated, and the delivery model operates under defined SLAs that hold each business unit to a consistent service standard.
Done well, a Shared Services Center is a genuinely powerful model. It eliminates the inefficiency of duplicated finance functions across entities, creates a single source of financial truth, and builds the process discipline and governance infrastructure that large, complex organizations need to operate at scale.
The world’s largest companies, from multinationals to global financial institutions, have built their finance operating models around Shared Services for exactly these reasons.
What it requires, however, is significant:
- Capital investment in technology, real estate, recruitment, and implementation costs
- Shared Services implementations take 18 to 36 months from design to stable delivery
- The economics of a Shared Services model only work at sufficient transaction volume and entity complexity
- Process maturity required for successful implementation of the model
For organizations that meet these conditions, large enough, mature enough, and patient enough, Shared Services delivers exceptional long-term value.
- KEY TAKEAWAY
SSCs are powerful but demanding they require significant capital, 18–36 months to implement, and sufficient transaction volume to justify the investment. Not every organisation is ready for them.
What F&A outsourcing delivers and when it works best
F&A outsourcing transfers operational responsibility for part or all of the finance function to a specialist external partner.
It solves for speed, capability access, and cost efficiency, without requiring the upfront investment, implementation timeline, or process maturity that a Shared Services build demands.
For an organization that needs its finance function to perform better now, not in two years, outsourcing is structurally better suited to the problem.
The conditions under which outsourced F&A delivers the most value:
- Transaction volumes, entity complexity, and reporting requirements outpace internal capacity.
- The finance team is stretched across operational tasks.
- Need for scalable finance capacity due to business expansion or acquisition.
- Process quality and governance are inconsistent across entities or functions
- High cost of building in-house capability
For most businesses below a certain scale threshold, and for larger businesses managing specific capacity or capability gaps, it is consistently the faster, lower-risk, and more cost-effective path to a well-governed finance function.
- KEY TAKEAWAY
Outsourcing delivers speed, specialist capability, and cost efficiency without the upfront investment or implementation risk making it the smarter choice when the finance function needs to perform better now.
The growth stage question: Which model fits where?
The most useful way to think about the Shared Services vs. outsourcing decision is not as a permanent either/or choice, but as a growth stage question. Different models fit different stages and the organizations that build the most effective finance functions over time are the ones that understand this sequencing.
Early to mid-stage growth (up to approximately $200M revenue)
At this stage, the finance function is typically under-resourced relative to the complexity of the business. Transaction volumes are growing, reporting requirements are increasing, and the internal team is stretched.
Outsourced F&A is the natural fit. It provides the specialist capability, process discipline, and scalable capacity the business needs, without the capital commitment or implementation risk of a Shared Services build.
Wins from outsourcing:
- Standardization, automation, process improvement
- Cost efficiency
- Improved quality and pace of service delivery
- Flexibility, scalability
Established scale ($200M – $1B+ revenue, multi-entity)
Many organizations at this stage run a hybrid model, having outsourced specific functions or geographies while building the Shared Services infrastructure in parallel. This approach allows the business to maintain finance performance during the transition without placing the full burden of change on an already-stretched internal team.
Wins from hybrid finance shared services model:
- Solid data foundation to build capital-intensive internal capabilities/infrastructure
- Cybersecurity, compliance, resilience
- Ease of entry and expansion into new markets
- Agility for merger, divestiture, and acquisition activity
- Real-time customer, partner, and process delivery insights
- Flexibility to experiment with innovative technologies and approaches
- KEY TAKEAWAY
Outsourcing fits early-to-mid-stage growth (up to ~$200M revenue); a hybrid model works best at established scale ($200M–$1B+). The right model depends entirely on where the organisation is in its growth journey.
The sequencing logic most finance leaders miss
The most common mistake organizations make when approaching the Shared Services vs. outsourcing decision is treating it as a binary choice rather than a sequence. They either commit to building a Shared Services Center before the organization is ready, creating a costly, painful implementation that delivers value years later than planned. Or they outsource indefinitely without a strategy for how the model evolves as the business grows.
The sequencing logic that works most reliably is straightforward: outsource first, build Shared Services later.
Benefits of sequencing:
- Outsourcing stabilizes, standardize and cleans finance data foundation
- Ensures governed, consistent, and audit-ready finance function
- Compresses the timeline for the Shared Services implementation.
- Implementation is faster, cheaper, and significantly low-risk
- KEY TAKEAWAY
The most reliable approach is outsource first, build Shared Services later. Outsourcing stabilises and standardises finance processes, making any future SSC implementation faster, cheaper, and lower risk.
The hidden risk in getting the sequence wrong
The sequencing logic is not just a theoretical framework. It is the approach that some of the world’s most sophisticated finance functions have validated in practice.
Pfizer’s Chief Accounting Officer Jennifer Damico, speaking at a recent Deloitte controllership webcast, made precisely this case, arguing that foundational process standardization must precede any technology or AI investment in the finance function. Her three-step framework is instructive: first, rethink what you do and how you do it. Second, assess the risk you are willing to absorb. Third, and only then, maximize the use of technology and automation.
There is another dimension to the Shared Services vs. outsourcing sequencing decision that rarely features in the conversation but should. As finance functions increasingly adopt AI-driven workflows and automated data pipelines, the governance foundation underneath those systems becomes a security and compliance question, not just an operational one.
The logic is straightforward. AI systems are only as reliable as the data they process and the governance structures that surround them. A finance function that deploys AI on top of fragmented, unstandardized processes does not just risk poor outputs, it risks compliance failures, financial misstatements, and audit exposure.
Data lineage, access controls, and audit trails are not technology features. They are the governance prerequisites that determine whether AI adds value or amplifies risk.
For CFOs, confidence in financial statements is increasingly tied to visibility into how data was accessed, processed, and used, not to just what the numbers say.
The cybersecurity dimension adds further urgency.
According to SAP Concur’s latest CFO Insights report, cybersecurity has overtaken economic conditions and geopolitical tensions as the biggest external concern for finance leaders globally. The exposure is real, and the cost is high. IBM’s research puts the average US cost of a data breach at over $10 million, an all-time high driven by regulatory fines and escalating detection costs.
Organizations that use outsourcing to establish clean, governed, audit-ready finance processes are not just preparing for a Shared Services build, they are building the data and governance infrastructure that makes their AI investments safe to deploy and their financial reporting resilient under scrutiny.
- KEY TAKEAWAY
Deploying AI or building Shared Services on top of fragmented, ungoverned finance processes amplifies compliance failures and audit exposure. Clean, governed data established through outsourcing is the prerequisite for safe technology investment.
Conclusion
Shared Services and F&A outsourcing are not competitors. They are different tools for different moments in an organization’s growth journey. The finance leaders who build the most effective finance functions over time are those who understand which tool fits the moment and have the strategic clarity to sequence them in the right order.
- FAQS
Frequently Asked Questions
1. What is the key difference between Shared Services and F&A outsourcing?
Shared Services is an internal centralised delivery model built and owned by the organisation. F&A outsourcing transfers operational responsibility to a specialist external partner. Both drive efficiency and standardisation, but at different costs, timelines, and levels of organisational readiness.
2. When does F&A outsourcing make the most sense?
Irish-incorporated companies prepare statutory accounts under FRS 102 (Irish/UK GAAP) or FRS 101 for qualifying group entities, within the statutory scope of the Companies Act 2014. Fintech firms authorised by the Central Bank of Ireland carry additional regulatory filing obligations on top of these requirements.
3. At what revenue stage should an organisation consider moving to Shared Services?
Shared Services typically becomes viable at the $200M+ revenue mark, where multi-entity complexity and transaction volumes justify the investment. Below that threshold, F&A outsourcing consistently delivers better value with lower risk.
4. Can Shared Services and F&A outsourcing work together?
Yes. Many organisations at established scale run a hybrid model outsourcing specific functions or geographies while building Shared Services infrastructure in parallel. This maintains finance performance during transition without overburdening the internal team.
5. How does F&A outsourcing support AI adoption in finance?
AI systems are only as reliable as the data and governance structures underneath them. F&A outsourcing establishes the clean, standardised, audit-ready data foundation that makes AI investments safe to deploy reducing the risk of compliance failures or financial misstatements.
