Corporate tax departments’ Groundhog Day problem — and the hybrid model that could fix it

Key takeaways:

• • • Tax departments lack resources and confidence — More than half (58%) of tax departments are under-resourced, and 59% are not confident that they can upgrade their tax technology over the next two years.

    • Under-resourced departments incur more penalties — At least half of respondents from under-resourced tax departments say their departments incurred penalties over the past year, compared to only about one-third of those from properly resourced departments.

    • Making the shift to proactive planning and value creation — For many tax departments, the winning model blends in-house expertise, targeted external support, and a coherent tech/AI stack that allows teams to shift from tactical compliance to proactive planning and strategic value creation.

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Under-resourced corporate tax departments spend more of their budget on external support compared to well-resourced teams — yet they’re more likely to incur penalties and less confident in forecasting, according to the Thomson Reuters Institute’s 2025 State of the Corporate Tax Department Report.

Given this, the problem isn’t a lack of spending — it’s the operating model. With respondents from 58% of tax departments saying they are under-resourced, 59% saying they lack the confidence needed to upgrade their existing tax technology over the next two years, and most spending more than half their time on reactive compliance work when they’d prefer to focus on strategic planning, clearly the gap between ambition and reality has never been wider.

The answer isn’t working harder or throwing more money at consultants, however. It’s building a hybrid ecosystem of people, platforms, and partners designed to shift capacity from firefighting to foresight.

The Groundhog Day problem

Every year feels the same: New tax legislation (such as the One Big Beautiful Bill Act or Pillar 2), new compliance burdens, new geopolitical uncertainty — coupled with the same old constraints. Too much work, not enough time, and technology that lags.

When deadlines hit, under-resourced teams rely on two blunt levers: overtime and reactive outsourcing. Internal staff end up working longer hours, and external providers plug the gaps at short notice. This model is breaking departments and it’s breaking down itself.

Under-resourced departments are significantly more likely to incur penalties, with 50% of respondents saying their under-resourced department had been penalized in the past year, compared to just 34% of respondents from well-resourced departments that say that, according to the report.

Further, under-resourced department respondents said they were less confident in their ability to forecast accurately, with just 26% saying their ability to forecast accurately was “very likely” compared to 43% of well-resourced department respondents. Ironically, under-resourced departments also spend more on external support as a percentage of budget (44%) compared to 37% for well-resourced departments. Clearly, spending more doesn’t solve structural problems — it often masks them.

Meanwhile, tax professionals report spending more than half their time on tactical or reactive work, even though they would prefer to spend up to two-thirds of their time on strategic analysis. Not surprisingly, when the team is locked into manual reconciliations and last-minute fixes, it’s nearly impossible to influence business decisions or shape strategy.

Why “all in-house” or “all outsourced” no longer works

When more work is moved onto the plates of the internal tax team, all in-house can often come to mean all heroics — talented people drowning in compliance volume with no time to use the analytical tools already on their desks. Conversely, all outsourced risks hollowing out the department’s institutional knowledge and weakening its seat at the table.

A hybrid model asks better questions: What kind of work is this, and where does it create the most leverage? These questions can be used to determine where and to whom work should go. For example, high-volume, rule-based, recurring tasks are prime candidates for automation, shared services, or managed services under strong tax oversight; while complex, judgment-heavy, strategically sensitive work should remain anchored in-house, with external advisors extending capacity and offering specialized insight.

Thus, the best model for a modern corporate tax department is a hybrid ecosystem — not a fixed organizations chart, but a deliberate blend of internal expertise, enabling technology, and external capability partners.

Four layers of the hybrid ecosystem

This hybrid ecosystem can be delineated into four layers, each bringing their own insight and value:

1. 1. 1. People and roles redesigned — High-performing tax functions invest in analyst and tax-tech roles that connect tax to enterprise resource planning (ERP) systems, data hubs, and analytics, thus freeing technical experts from manual data work. Senior professionals then become embedded advisors to finance, treasury, and the business, not just compliance reviewers.
      2. Processes segmented into “run” and “change” — The biggest barriers to strategic work are excessive volume, heavy compliance burdens, limited resources, and time pressure. Modern tax departments respond by explicitly segmenting work in which run the business processes are documented, standardized, and increasingly automated or pushed into shared or managed service models. Change the business work remains tightly linked to senior tax staff.
      3. Technology becomes the data spine — More than half of respondents say they expect above-normal increases in their tax technology budgets, and more than half say their main resourcing strategy is introducing more automation. The goal isn’t collecting point solutions; rather, it’s building a coherent data spine that includes ERP integration, tax-specific data models, consistent workflow tooling, and strategic platforms that flex as regulations shift.
      4. AI act as an accelerator — Two-thirds of tax departments aren’t yet using generative AI (GenAI), according to the report. And among the one-third that are, usage clusters around research, document summarization, drafting, and some analytical support. The next step up the AI chain is for departments to move from individual experiments to standardized, governed workflows that scan legislation, prepare first drafts of memos, or interrogate large data sets for anomalies.

What high-performing hybrid tax departments do next

Departments that feel well-resourced, allocate more time for their professionals to conduct proactive work, and invest deliberately in technology and skills are significantly more confident in their ability to forecast accurately, avoid penalties, and minimize tax liabilities, the report shows.

Indeed, these high-performing hybrid tax departments:

• • • invest ahead of crises in people, tech, and processes
    • treat external providers as capability partners, not emergency relief
    • actively protect time for strategic work by automating or outsourcing routine tasks
    • insist on a durable seat at the strategy table, not just one for compliance reporting
    • experiment with automation and AI in focused, repeatable use cases

It is worth noting that smaller companies (those under $50 million in annual revenue) and the largest one (those with more than $5 billion in revenue) are leading the way by securing leadership buy-in early and leveraging specialized external expertise rather than trying to build everything in-house. Midsize companies, by contrast, are more likely to rely on in-house teams to lead automation efforts and less likely to use third-party vendors — a cautious approach that risks having them fall too far behind to catch up.

The message: Design the ecosystem, don’t just work harder

For corporate tax professionals, the message may be harsh but hopeful: You cannot work your way out of structural constraints by effort alone. Rather, a well-designed hybrid ecosystem can turn those constraints into a catalyst that will allow the department to deliver more value to the business. In fact, the modern corporate tax department is hybrid by necessity; but the question is whether it’s hybrid by design — or just by accident.

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You can learn more about the challenges facing modern corporate tax departments here