M&A integration and indirect tax: managing the moving parts before, during, and after a transaction

In brief: In a merger or acquisition, indirect taxes such as VAT run through nearly every operational process — invoicing, moving inventory, paying suppliers, collecting cash. When they are planned well, the combined business can trade compliantly from day one; when they are overlooked, errors cascade and can add material, unrecoverable cost to the deal. Effective indirect tax management therefore spans the whole transaction: due diligence, structuring, implementation, and integration.

Key takeaways

• Indirect tax risk has a domino effect because VAT is embedded in everyday operations, and that effect intensifies during M&A.
• Historical due diligence is only the starting point; how the indirect tax profile will function after the deal matters just as much.
• VAT rates of up to 25 percent in the EU (27 percent in Hungary) mean even small invoicing or registration errors can become costly.
• A VAT registration can crystallize a permanent establishment in some jurisdictions, increasing corporate income tax exposure.
• Invoicing is where a half-finished integration most often fails—ownership of ERP configuration and registrations must be assigned up front.

Why does indirect tax matter so much in a merger or acquisition?

Indirect taxes run through almost every routine activity a company performs: raising sales invoices, moving inventory, paying suppliers, and collecting cash. Because they are woven into operations this way, indirect tax risk tends to have a domino effect — one error cascades into the next — and that effect grows sharply during a merger or acquisition. Yet these taxes, and the planning opportunities that come with them, are often overlooked, particularly as business models become more global and more complex.

How did indirect tax due diligence traditionally work?

In a simpler era, a purchaser’s due diligence concentrated on identifying, assessing, and quantifying historical indirect tax exposure. The goal was to understand those risks and then build adequate protection into the contract in case history repeated itself. With that information in hand, a buyer could negotiate a lower price or secure indemnification against the risks identified.

Advisory work also extended to the opportunities embedded in the deal structure. With effective planning, deal costs would cascade down the group to settle in an entity where they could be deducted for corporate income tax purposes, and value-added tax would not “stick” as an unrecoverable cost — a meaningful concern given VAT rates of up to 25 percent in the European Union, and 27 percent in Hungary.

Asset deals attracted lighter scrutiny. Historical risk generally stayed with the seller, and the buyer assumed only the exposures tied directly to the assets themselves, such as a VAT adjustment period. Where the assets together qualified as the transfer of a business as a going concern, the deal could fall outside the scope of VAT altogether: the seller would not charge or report it, the buyer would not pay or deduct it, and both sides could enjoy a cash-flow benefit.

Why are today’s transactions harder to manage?

As the commercial world has grown more connected, corporate structures have grown more intricate. A diagram of a typical multinational today can resemble a Rube Goldberg machine — a tangle of interdependent parts that must connect precisely for tax, regulatory, and reporting purposes. Indirect tax sits awkwardly within this picture. Unlike income-based taxes, which tend to be managed centrally, responsibility for indirect tax is often scattered across the enterprise: not only in the tax department but in finance, IT, supply chain and logistics, human resources, and elsewhere.

Two trends compound the difficulty. The first is the rise of shared service centers that run operational processes such as accounts payable and receivable, alongside outsourced tax, finance, and treasury functions. The second is the reliance on one or more enterprise resource planning (ERP) systems to determine and report tax across the whole operation — systems that are integrated to varying degrees and supported by tax technology of varying sophistication. The practical consequence is that fundamental tax due diligence, while still essential, is only the opening chapter. Just as important is thinking through how the indirect tax profile should be structured and how it will actually function after the acquisition.

What indirect tax questions should buyers ask before an acquisition?

Asking the right questions early — of external advisers and of company leadership alike — helps focus attention where it matters most.

Processes, controls, and retained knowledge

The central concerns are what the new processes and controls will be, who will own them, and whether the acquired business’s tax knowledge and key staff will be retained or lost to resignations. It is equally important to establish which technology will carry over, who understands the history of past tax planning well enough to keep the right structures intact, and how the seller’s processes and systems will ultimately be integrated.

The new structure and VAT

These questions are more technical but no less commercial. Should VAT be charged on the sale, and if so, in which country and at what rate? Who bears liability for any VAT due, can it be deducted, and who is responsible for errors and penalties? How will acquired inventory fold into the purchaser’s supply chain? A classic principal structure may help concentrate profit in low-tax jurisdictions, but it requires a single entity to hold title to inventory and to register for VAT in every location where that inventory sits.

Inventory hub locations deserve particular care. Planned well, they allow import VAT to be deferred until it no longer represents a cash-flow cost. Planned poorly, a “virtual” VAT inventory arrangement can do the opposite — if every national entity moves its own goods across borders to maintain minimal local stock, each subsidiary may end up needing a VAT registration in every other jurisdiction. There are knock-on effects for U.S. groups as well: a VAT registration is generally required wherever inventory is held, and in some countries, notably in Asia and Latin America, that registration can crystallize a permanent establishment for corporate income tax, sharply increasing both the U.S. parent’s foreign compliance burden and its tax bill. Finally, deal costs are usually cascaded so the corporate income tax deduction sits in the right entity; but if a cost is stranded in a holding company, the associated VAT becomes an absolute cost of the transaction.

How does changing the business model create new VAT risk?

Changing the operating model can itself create VAT risk. A selling arrangement may shift from buy-and-sell to broker or agent, or the reverse; purchasing may be centralized; and the routes and storage points for goods may move. Any of these changes can trigger new VAT registration obligations in different countries, shift which entity must charge VAT, alter whether that VAT is recoverable, and generate entirely new billing flows.

Accounts payable and receivable

As integration proceeds, even something as mundane as a billing error — an invoice issued in the wrong name — can delay revenue and leave VAT unrecoverable. Because penalties for incorrect invoicing are often calculated as a percentage of turnover, the amounts escalate quickly: VAT of up to 25 percent in Europe (27 percent in Hungary) on turnover, plus penalties on top.

Intangible assets

A fundamental question is where ownership of intangible assets will sit in the new structure, and whether it will migrate to a low-tax jurisdiction. The risk is easy to underestimate. In one instance, VAT was charged on the sale of intangibles between two U.S. corporations because the assets were exploited in Europe and the acquirer had not arranged the necessary registrations in advance. The VAT proved unrecoverable, adding an unexpected cost of roughly 20 percent of the asset’s value. It is a clear illustration of the limits of purely historical due diligence: if intangibles were not an issue before, the past shows no risk — while the current and future exposure looms large.

What are the practical risks during implementation and integration?

Anyone who has lived through an M&A knows how many moving parts surround indirect tax, and how easily some are overlooked. Four stages deserve particular attention.

Implementation

Once a structure has been chosen that is both commercially sound and tax-efficient, the theory has to be put into practice. That means deciding who will file VAT registrations and when — lead times can run to several months — who will keep the business operating in line with the agreed model, how that model is communicated, and how ongoing monitoring will be handled. Most major ERP systems, including SAP, Oracle, JD Edwards, and PeopleSoft, offer some VAT functionality, but it typically needs significant configuration and customization to handle indirect tax correctly, and it must be updated and tested for new contracts and billing flows. Ownership of these tasks has to be settled and communicated up front so the system can issue accurate invoices from day one.

Integration

The next stage is to fold the legacy business into the new one where possible, or to run a hybrid in which two legacy systems operate side by side. A fully integrated system is more likely to deliver economies of scale, but in either case continuity of tax knowledge is what manages the risk. That continuity reaches well beyond the tax team — into the logistics staff who understand the physical flow of goods and file customs declarations, the shared service center clerks who actually raise the invoices, and the IT team who manage data between systems.

Impact

The risks here are best understood through their consequences. What happens if a VAT registration is not obtained in time, if the ERP system is not properly tested, if no one owns the key processes centrally, or if the project team does not grasp the material weight of indirect tax? The fallout ranges from logistical failures, such as goods being held at customs, to invoicing errors that delay collections, to incorrect tax treatment and compliance breakdowns that bring payment errors, reporting errors, and penalties.

Interim solutions and invoicing

When the new model cannot be built into the purchaser’s ERP system in time, the common fix is to outsource the process back to the seller temporarily under a transitional service agreement. Practical as that is, it introduces fresh risk: it can look like outsourced VAT accounting, raising compliance questions, data-access difficulties, and doubts about control quality, while the seller’s staff bridging the gap have little stake in the new model. Invoicing is where the strain shows most. Payable invoices may be coded incorrectly so that VAT cannot be deducted; or incorrect sales invoices go out, creating problems for customers, misstated tax figures, and missed compliance obligations. Knowing who is both legally obliged and practically able to issue invoices becomes critical.

Indirect tax M&A checklist

Indirect tax risk is present across the entire M&A and integration lifecycle. A handful of leading practices help keep it from becoming a stumbling block:

1. Establish a project charter that takes effect from the very first due diligence activities.
2. Validate the due diligence findings and set clear priorities.
3. Build an indirect tax integration plan and secure buy-in from the right sponsors.
4. Map the current state at acquisition, identifying key risks, opportunities, and people within the acquired organization.
5. Jointly validate and refine the plan, developing a road map to a successful integration.

Frequently asked questions

Why is indirect tax important in M&A integration?

Because VAT and similar taxes are embedded in everyday operations — invoicing, inventory movement, supplier payments — a single error can cascade into delayed revenue, unrecoverable tax, and penalties. During an acquisition the number of moving parts multiplies, so indirect tax can materially affect both the cost and the success of the deal.

How does an asset deal differ from a share deal for VAT purposes?

In an asset deal, historical risk usually stays with the seller and the buyer takes on only the exposures tied to the assets. Where the assets qualify as the transfer of a business as a going concern, the transaction may fall outside the scope of VAT entirely, giving both parties a cash-flow benefit.

Can a VAT registration create a permanent establishment?

Yes. A VAT registration is generally required wherever inventory is held, and in some jurisdictions — notably parts of Asia and Latin America — that registration can crystallize a permanent establishment for corporate income tax, increasing both compliance obligations and the tax due.

What is the most common indirect tax problem during integration?

Invoicing. When a legacy system is only partly integrated, payable invoices may be coded so that VAT is not deductible, and sales invoices may be issued incorrectly—causing customer problems, misstated tax figures, and missed compliance obligations.

What risk does a transitional service agreement carry?

Temporarily outsourcing the process back to the seller can resemble outsourced VAT accounting, which raises compliance questions, data-access difficulties, and doubts about control quality — compounded by the fact that the staff doing the work have no lasting stake in the new model.