The Future of Tax Advisory: Five Theses and What AI Really Changes

For decades, tax advisory was a field that changed only slowly. The tools got better, the regulations more numerous, the demands on speed higher, but at its core the work stayed the same: receipts, bookings, financial statements, advice. That inertia is now ending abruptly.

Technological progress is shifting the boundaries of what digitalization makes possible. Demographic change is hitting hard and putting firms under pressure. PE-backed firm groups and ambitious startups are reshaping the structures of the market. Rarely have so many shifts reached the industry at once.

The demographics make the pressure tangible: the average age of tax advisors in Germany is 53.7, nearly half (45.8 percent) are 56 or older, almost a third (31.6 percent) are even 61 or older, while only 2.6 percent are under 30 (German Federal Chamber of Tax Advisors (Bundessteuerberaterkammer), 2025 professional statistics). As these cohorts retire, many clients will look for a new firm, while too little young talent moves up to replace them. Firms with capacity and strong processes can absorb this demand.

The market structure is in motion too: two in three firms are sole practices (67.1 percent of roughly 54,000 practices), while the number of professional practice companies is growing by 3.8 percent and more and more qualified professionals work as employees rather than self-employed (German Federal Chamber of Tax Advisors (Bundessteuerberaterkammer), 2025 professional statistics). It is precisely into this fragmentation that PE-backed firm groups and startups are pushing to consolidate the market.

We see this as an opportunity. Not despite the depth of the change, but because of it. The future of tax advisory will be more demanding, more relevant, and more individual than the present. Firms face a decision about how they want to shape their future. This piece sets out our view in five theses.

Thesis 1: The more AI can do, the more valuable the person who uses it becomes

The greatest value arises where technology lifts advisory to a new level.

Many of the laborious tasks that are still part of tax advisory today were never the actual value: sorting receipts, capturing data, filling out forms. They were the price you had to pay to get to the value, namely accurately representing the economic situation and deriving business decisions from an understanding of the numbers. Digitalization is taking over more and more of these upstream tasks. What remains is what clients truly value their advisor for.

Because wherever AI is in use, the same pattern shows: experience and judgment become more valuable through the technology, because they are applied more precisely where they are truly needed, and because they subject AI's seemingly polished concepts to critical scrutiny. Especially in a field like tax advisory, where specialists are increasingly scarce, this leverages expertise in the client's interest. Where service quality suffers today because overload on the mandatory work eats up the time for shaping and planning, new room opens up for proactive collaboration.

What this means for us: We are deliberately not a software business; we stand for technology-enabled service. Technology is not the product but a tool that works together with the expertise of our specialists. We are convinced that the advantage for the client is greatest where human competence and technology are consistently combined. Every client has fixed points of contact, with a mobile number. No chatbot loop, no ticketing system, no rotating case handlers who don't know the case. That sounds like the past, and for us it is actually the future, because only a firm that has seriously automated its routine work can afford this kind of accessibility.

Thesis 2: The firm's tech stack grows broader

The firm of the future no longer works in a single large system, but in a modular architecture that breaks complex tax tasks down into their steps and deploys people and technology wherever each is strongest.

For decades, tax advisory was marked by a strong fixation on DATEV, which held everything under one roof: accounting, financial statements, tax returns, archiving, the interface to the authorities. That was useful as long as the work itself remained manual. Today it is a drag. Anyone who wants to automate an activity has to be able to view, optimize, and control it in isolation. DATEV's sheer size makes it sluggish here.

The firm of the future therefore has its own individual digital backbone: DATEV or comparable systems remain an important interface to the authorities and for compliance requirements such as audit-proof archiving under GoBD, Germany's principles for the proper keeping and storage of digital records. But many sub-steps of the process are pulled into a broader architecture ahead of DATEV that optimizes data flows via interfaces to the most important client systems, breaks the processes built on them down into granular sub-steps, and solves each step with the right tool. Some of this is AI, but much of it is not: plausibility checks run more reliably as scripts, and where judgment is needed, the human stays in the loop.

What this means for us: We build our firm accordingly and break the core processes down into their sub-steps. This lets us keep asking: what can be safely automated today, where is a human needed, and which part will be ready for the next automation stage in 6, 9, or 12 months? We then reassemble the individual building blocks into a seamless end-to-end process through workflow automation. Breaking things down is not an end in itself, quite the opposite: only those who control a process in its parts are able to solve each step optimally. This granularity is the only way to be fast in a regulated field without becoming unsafe. Whoever hands everything to AI at once builds a system they no longer control. Whoever doesn't automate at all stays trapped in an increasingly left-behind world. The path in between is more demanding, but it is the only one that fits our standard of quality.

Thesis 3: The processes of firm and client grow together more closely

The tax advisory of the future is not a digital platform the client has to operate. It integrates as well as possible into existing systems and workflows, so that data flows automatically and collaboration becomes easier for the client.

For decades, the classic collaboration between client and firm was a deliver-it-yourself model: collect receipts, upload them or hand them over in a folder passed back and forth, wait, follow up. Many current digital solutions change little about this; they merely replace that back-and-forth folder with an additional portal. For the client, onboarding at the firm usually also means a new system into which they have to dump data they have long maintained elsewhere.

The firm of the future turns this logic around. It connects via interfaces to the systems the client already uses, such as banking, invoicing tools, ERP, or payroll systems, and automatically pulls the relevant data into a secure environment where the firm processes it. This creates something that was not possible in the old model: whoever sees and understands the data in its full breadth spots issues early. Reactive processing becomes real-time transparency and proactive advice.

What this means for us: We don't want to be the provider of yet another platform the client has to operate; we integrate into their systems as well as possible. For the client, that means less manual back and forth of documents, no new system. And because the data comes straight from the systems, the bookkeeping depends far less on individual documents being handed in: it becomes faster and more reliable. For us, it means we reliably get to the relevant data and have our hands free to check, contextualize, and decide. This is exactly where an important difference to the classic firm and to pure software lies: the one forces the client into unnecessary manual processes, the other leaves them alone with their questions. We do neither.

Thesis 4: The digital firm stays a robust model over the long term

The firm of the future continues to support its clients in the classic areas: ongoing financial accounting and payroll as the foundation, financial statements as the professional core, advice as the shaping lever. Each of these areas is changing, but their interplay remains and stabilizes the value of working with tax firms even in a digital world.

Ongoing accounting and payroll remain the foundation of the collaboration in the future too. It is here in particular that many believe AI agents will soon automate accounting and payroll so thoroughly that firms are no longer needed. We see it differently: the more I let an agent handle tasks in the background that I myself only partly understand, the greater the danger of half-knowledge. In such a sensitive and regulated area, that is precisely a risk, because whoever blindly adopts an advance VAT return is still liable for it.

A firm that has specialized in truly mastering the digitalization of these processes takes this risk off the client's shoulders. It ensures that the ongoing matters run cleanly, on time, and in a legally sound way, and shares the efficiency gain with the client. This security has a value, which means that accounting and payroll will in the future be outsourced to well-digitalized firms even more, not less. After all, you are not outsourcing the work, but the responsibility for making the automation run safely. Ongoing support becomes so unobtrusive that the client barely notices it. Yet it is a central building block, because it produces the data foundation on which both the clean fulfillment of compliance tasks and a data-driven advisory offering are built.

What this means for us: We see ongoing financial accounting and payroll as a product in its own right. The key difference from software the client operates themselves: we take responsibility for the professional accuracy. We build on that, from efficient financial-statement preparation to the continued expansion of our advisory services, together with our partner network, from a single source.

Thesis 5: New ways of working need new roles

The four preceding theses also change who works in the firm and how. The firm of the future no longer knows a rigid separation between tax advisors who delegate and clerks who execute. It creates new, future-ready roles: clerks become tax professionals who monitor systems, review their results, and contextualize them for the client. That demands more expertise, not less, and makes the profession attractive again to a broader pool of talent.

Why that is so and what it means for the future of the profession, we explore in a dedicated piece: Tax advisors, a profession with a future.

The through-line: legal certainty and quality

Everything we describe here holds only under one central condition: legal certainty. Tax advisory is not a field where you experiment and correct afterward. An error in the advance VAT return, a wrong assessment in advice, archiving that is not GoBD-compliant: in the end, the clients bear the consequences. This is not a question of attitude but of professional law: under the German Tax Advisory Act (Steuerberatungsgesetz, StBerG), the commercial provision of assistance in tax matters is reserved for qualified professionals. Software can neither take responsibility for nor sign off on a tax return.

This is exactly where the real value lies. By engaging a tax advisor, the client is not buying information but the assumption of risk, and that is something no model can provide. Professional liability insurance is, at best, only the last safety line. The more AI floods the market with plausible-sounding but potentially wrong answers, the higher the premium for someone who contextualizes, takes responsibility, and stands behind it with their name.

This premise runs through all five theses. It is the reason a broader tech architecture does not mean handing every task to AI, but controlling the decisive steps individually. It is the reason integration into client systems only works through the highest data protection standards and client-owned data spaces. It is the reason clerks become tax professionals who need more expertise, not less. And it is the reason the business model stays viable despite all the digitalization, because clients pay precisely for this reliability.

This is demanding and sometimes leads to delays. But we are convinced: speed without direction is not speed, only motion. Whoever runs fast in the wrong direction only arrives faster where they didn't want to go. Safety and quality are not the price we pay for speed, but the direction it points in. Whoever doesn't master this harms their clients and, in the end, their own development. At the same time, one must not freeze in fear of the new, because then you get left behind. At its core, the central task in this development is therefore the organization of pace and direction.

What does this mean for us at Vantoya?

Tax advisory in Germany faces profound change. Technology is changing workflows, demographics are changing organizational structures, new market entrants are changing the competitive dynamic. Anyone who wants to succeed in this movement has to develop deliberately.

We believe this path does not lead through acquisitions and consolidation, but through building a firm designed for this new world. A firm that still understands tax advisory as a service, not as a tool, and that precisely for this reason deploys technology with real added value for its people and its clients. A firm in which tax professionals continually develop, take responsibility, and help shape things, instead of working through tasks blindly. A firm that integrates its clients' processes into tax solutions.

With Vantoya, we set out on this journey a good two years ago. Today our professionals serve a growing number of clients. On this foundation, we are taking the next stages of the transformation.