When tax leaders describe what makes their function hard to run, they tend to reach for the same explanations: regulatory complexity, resourcing constraints, the pace of change in the external environment. These are all real. But watching my colleague run a live tax technology maturity assessment at SYNAPSE Workshop last month, the data pointed to a different diagnosis.

The problems most tax teams are experiencing day to day trace back to something more foundational, and almost nobody is naming it directly.

Where the data lives

The first question was deceptively simple: where does the data your tax processes depend on actually live? The options ranged from data spread across many systems with no central ownership, to a single source of truth that everything else feeds into cleanly.

Not one respondent out of 21 chose the top option. Zero. The most common picture, chosen by 48% of the room, was several systems with bridges and reconciliations between them. A further 24% described data spread across many systems with separate formats and owners. Only 29% were operating primarily from one system, managing a small number of feeders around it.

Every single person in that room was working with data that required active reconciliation effort before it could be trusted for tax purposes. The data infrastructure was not a foundation the function could build on. It was a problem the function was managing around.

When errors surface

The downstream effect of that picture showed up clearly in the next question: when they find a tax data error, when did it actually happen?

48% said often weeks or months ago, caught during reconciliation or audit. 43% said within the current period, caught at close. 10% said within days. Nobody had real-time detection.

91% of the room was finding errors after the fact, with almost half discovering problems that had been sitting undetected for weeks or months. The function is running on data it can't fully trust in real time, which means decisions made on that data carry a margin of error that only becomes visible later.

Where determination sits in the picture

The third question moved from data to what the data powers: how is tax actually calculated when a transaction happens?

Here the room was more spread. 20% had achieved full automation with no human in the loop. 35% were mostly automated, managing exceptions. A further 35% described a mixed picture where most transactions still needed human handling. 10% were still working manually, on spreadsheets and offline processes after the fact.

On the surface, the determination picture looks more encouraging than the data foundation picture: over half the room had meaningful automation in place. But determination automation built on a fragmented, unreliable data foundation is only as good as the data it processes. The 20% who had achieved full determination automation were almost certainly the same organizations running cleaner data infrastructure. The correlation between data maturity and determination maturity is not coincidental.

What the data actually tells us

The problems tax teams describe as resourcing problems, process problems, or complexity problems are almost always data infrastructure problems that haven't been named as such. The manual rework at close, the errors discovered during audit, the slow response to regulatory changes: these trace back to the same condition. The data wasn't unified, validated, and available when it was needed.

The teams that close the maturity gap fastest are the ones that address the foundation first. When the data is clean, unified, and flowing correctly, most of the downstream problems that consume operational capacity either shrink significantly or resolve entirely. The resourcing problem doesn't disappear, but it becomes a genuinely different problem than the one the team was solving before.

Assess your own tax maturity 

Take the online tax technology maturity assessment to benchmark your own operations. It takes around six minutes and covers the core areas explored at Synapse SF, a shorter version of the full assessment that goes considerably deeper. Simply answer six questions to receive a customized report to help you understand where you currently stand and how to improve.

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