Money now moves faster than the law can think. Across Europe and the UK, fintech firms such as Revolut and Wise advertise borderless accounts and instant transfers, yet tax authorities remain anchored in geography-bound rules. The question is simple and unsettling, just how do you tax a company that lives in the cloud and operates in ten jurisdictions simultaneously? In this article we’ll explore five increasingly urgent frontiers of that challenge, from overlapping tax regimes and algorithmic audits to decentralised finance, through the sharp-eyed lens of UK and EU regulation. Strap in: the tax world is catching up, but it might just be too late.

The Borderless Bank Account

Fintech moves faster than tax codes can blink. As already mentioned, many firms have redefined cross-border banking, scaling across Europe and the UK in months rather than years. They operate through apps, not branches, using servers, not storefronts. Yet tax law still leans on the century-old notion of “permanent establishment”,  the idea that profits arise where an office or workforce physically sits.

Imagine a London fintech offering euro accounts from servers in Ireland, customers in Spain and developers in Lithuania. Where does it owe VAT, corporate tax or the EU’s proposed Digital Services Tax? Each jurisdiction can stake a claim, yet none fits neatly within the old frameworks.

Post-Brexit divergence only complicates things further, with the UK and EU now drifting apart on digital-service and financial-tax treatment. Even Brussels is questioning long-standing VAT exemptions for financial services. Fintech isn’t breaking the rules, it’s simply revealing how outdated the borders of taxation have become.

Double Taxation or Double Trouble?

Double taxation sounds abstract until the same digital pound is taxed once where it’s earned and again where it’s used. An EU payments start-up serving UK customers can be pulled into the OECD’s (Organisation for Economic Cooperation and Development’s)  anti-avoidance rules under Base Erosion and Profit Shifting (BEPS), and face divergent EU and UK treatments of what counts as a “financial service” versus a “digital supply”. Each definition triggers different VAT and profit-allocation consequences, spawning duplicate filings and audits.

Consider a buy-now-pay-later provider scaling across Europe and Britain with authorisations in multiple states, income booked in one entity, servicing done in another. Every step becomes a tax judgement call. Klarna, operating in many markets, has highlighted the operational complexity of cross-border expansion, a complexity that quickly turns into tax spend.

The hidden bill? Lawyers, reporting software and transfer-pricing updates, often rising faster than revenue. Post-Brexit divergence adds a second playbook to learn, while the EU’s expanding data-sharing regimes (for example, DAC8) tighten information flows.

Ironically, the more “borderless” fintech becomes the more parochial its tax headaches feel, with global products, local paperwork and no single cashier at the till.

Algorithms and Auditors

Fintech’s campaign of algorithmic innovation isn’t only about faster payments, it’s also forcing tax compliance into a whole new gear. For instance, AI-driven underwriting models now route thousands of credit decisions in milliseconds, yet when the tax office asks, “who made this decision and where’s the data trail?” the answer can be fuzzy. Meanwhile, tax authorities such as HM Revenue & Customs (UK) are deploying machine-learning tools to spot suspicious transactions in real time, flagging social-media posts, lifestyle shifts and wallet anomalies.

In one groundbreaking move, HMRC’s innovation head revealed that AI tools handled over 13 million transactions in 2024/25, freeing up the equivalent of 400 full-time staff. On the flip side, fintechs themselves are now using “algorithmic taxation”. These are predictive models to estimate exposure, suggest transfer-pricing routes and even negotiate with advisers. A recent study of “agentic AI” for financial crime compliance proposes systems that auto-select audit trails and generate blockchain-based logs.

But here’s the rub: automation may promise precision and speed, but only if regulators can read the code. Otherwise, we’ve swapped human ambiguity for machine opacity.

Regulators Without Borders

Global tax reform is the holy grail for fintechs and their tax advisers alike. The OECD’s two-pillar framework aims to reallocate tax rights to where customers sit (Pillar One) and impose a global minimum tax of 15% (Pillar Two). Meanwhile, the EU has adopted Directive (DAC 8) to force the automatic exchange of crypto-asset data across borders.

In practice, fintechs based in the UK now find themselves navigating a split world: one foot inside the EU’s co-ordinated regime, the other dancing to UK’s independent beat. Post-Brexit innovation is fast, but so is inconsistency; the UK may skip ahead, yet still lacks full alignment with EU or OECD systems. Sandbox initiatives in the UK and Ireland are proving useful testbeds for cross-border tax frameworks, letting regulators experiment with “digital tax sandboxes” before full roll-out.

What’s emerging is a first draft of a “Digital Tax Treaty” rather than a traditional one: algorithmic, data-driven and border-agnostic. But while the theory glitters, ditching the old physical-presence model demands political will. Until then, fintechs may reap global scale but have to cope with local complexity.

The Crypto Conundrum

On a typical DeFi platform a user might stake tokens, earn rewards, swap assets and lend funds, but no single jurisdiction holds all the pieces. Ownership is anonymised, profits arise across chains and jurisdiction is undefined. Traditional tax rules, designed for bricks, desks and resident accountants, simply don’t fit.

The Markets in Crypto‑Assets Regulation (MiCA) took effect in the EU in December 2024, aiming to bring crypto into a unified regulatory and taxable framework. Meanwhile the UK is revamping its crypto-regime through updated crypto-asset guidance from HM Revenue & Customs, signalling new reporting obligations for service providers.

Some innovators propose “on-chain tax remittance” via smart contracts that auto-deduct tax at the wallet level, while others suggest ledger-based audit trails that flag cross-border profit flows in real time. Yet these collide with privacy norms and decentralisation’s promise: should a decentralised autonomous organisation (DAO) be forced to report like a national bank?

Crypto isn’t flouting the rules so much as exposing that the rule-book needs rewriting. And until we do, taxation remains reactive, fragmented and largely unfit for the chain.

Evolve or Be Left behind

In a world where the “borderless bank account” has become more than a slogan, tax systems must evolve or be left behind. Real-time reporting, cross-agency data sharing and AI-mediated dialogue between companies and tax authorities are no longer futuristic concepts but urgent imperatives. The Netherlands’ innovation in real-time tax collection demonstrates this shift.  The future belongs to fintech firms that treat tax not as a compliance burden, but as a strategic asset, embedding tax design into their global architecture rather than retrofitting it as an after-thought. As digital finance continues to scale effortlessly across jurisdictions, the true test will be whether the infrastructure of tax can catch up. Fintech may have erased the borders of money, but the real innovation will come when tax does the same.

 
And what about you…?   

•  How well prepared is your organisation to manage tax compliance across multiple jurisdictions — and do you see it as a strategic function or merely a regulatory obligation?

•  Do you believe AI and automation will simplify or complicate tax compliance in your business over the next five years? Why?