TAXENTRIQ

Enterprise Tax Intelligence

Tax determination in SAP, implemented, tested and supported.

SAP tax determination — implementation, testing & support

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ONESOURCE · Vertex · Native SAP 2026

01 — The problem

Most tax determination defects are found by the filing team.

A month after go-live, when they are expensive. By then the wrong tax code sits on thousands of documents, the correction is a disclosure conversation, and nobody can say cleanly whether the cause was configuration, master data or the engine.

Why it happens

Nobody owns it

The system integrator treats tax as the tax team's scope. The tax team assumes the integrator tested it. Determination falls in the gap between them.

Why it persists

Testing is shallow

A handful of happy-path scenarios pass. The combinations that actually break — registrations, classifications, cross-border flows — are never constructed.

Why it costs

Evidence is missing

When the auditor asks how determination was validated, there is a screenshot and a memory. Not a signed-off scenario set with results.

TAXENTRIQ closes that gap.

We implement, test and support tax determination in SAP — across ONESOURCE, Vertex and native SAP — and keep it accurate as rates, rules and regulations change.

02 — Who we are

An enterprise tax technology firm, built on delivery experience.

The firm was founded by SAP Indirect Tax specialists whose careers have been spent inside enterprise tax programmes: global rollouts on S/4HANA and ECC, ONESOURCE and Vertex integrations, tax cutovers, and the month-one filings that follow them.

26Years combined

100+Countries delivered

20+Tax go-lives

6Services

Our depth is in the layer between SAP and the tax engine — how determination is called, what master data drives it, where the condition technique hands off, and why the answer comes back wrong. We are deliberately engine-agnostic: we have no stake in which engine you chose, which in a defect argument between the integrator, the tax team and the vendor is usually the fastest route to an answer.

The mark — a determination crossing Select a crossing

Ship-from ↓ / to →

—

Select a crossing to resolve it

Rows are the ship-from country, columns the ship-to. B2B supply of goods, customer VAT-registered and validated.

Two axes cross and resolve to a code. That crossing is the whole discipline — and it is our mark.

03 — The portfolio

Six services across the lifecycle.

Most clients begin with one and move outward. They are designed to be bought separately.

01

Assess

Tax technology assessment

A scored diagnostic across design, data, integration, assurance, controls and support — with a prioritised view of what to fix first.

02

Codes

Global tax-code intelligence

Tax code framework, determination logic and G/L mapping by treatment across your countries and registrations.

03

Config

Configuration and build

Build and verify tax configuration across SAP, the engine and the integration between them, tracked to a cutover-readiness gate.

04

Test

Determination regression testing

Full scenario coverage, executed and triaged to root cause, with reviewer sign-off evidence an auditor will accept.

05

Reconcile

Reconciliation and assurance

Three-way match of postings, determination output and filed positions, with every variance classified and explained.

06

Operate

Managed tax technology

Ongoing support with a scheduled run calendar — content cycles, regression on every change, and period-close controls.

Where most clients start — TAXENTRIQ Test

Determination testing is the step most often skipped and the one that decides whether go-live is quiet. It is also the fastest way to find out whether the rest of the landscape needs attention.

04 — Services in detail

TAXENTRIQ Assess

Tax technology assessment

When: You suspect the landscape carries risk but cannot say where. A programme is coming and you need a defensible view of readiness.
What we do: A structured diagnostic across eight domains — determination design, tax code framework, master data, engine integration, testing, controls, compliance readiness and the support model. Scored against evidence, not assertion.
You receive: A scored maturity picture by domain, a prioritised findings register weighted by criticality, and a costed view of what to fix first.

TAXENTRIQ Codes

Global tax-code intelligence

When: Tax codes have grown by accretion and nobody can explain the estate. A new country or acquisition needs designing. G/L postings are landing in the wrong accounts.
What we do: Design the tax code framework across your countries and registrations — naming convention, determination logic, account key and G/L mapping per treatment.
You receive: A complete design with G/L assignment by treatment: non-deductible, deferred, import, acquisition and withholding each posting where they belong, not to a generic input/output pair.

TAXENTRIQ Config

Configuration and build

When: A country rollout, an acquisition integration, an engine migration, or an implementation that did not land.
What we do: Build and verify configuration across SAP, the engine and the integration — procedures, codes, condition records, account keys, G/L assignment, registrations, engine mapping and failure handling on the engine call.
You receive: A controlled build register: every object in dependency order, with an owner, a status, a transport and a separate verifier. Readiness is a gate, not a progress bar.

TAXENTRIQ Test

Lead engagement

When: Before any cutover, upgrade, country release or engine content change. If your last go-live produced a tax surprise, this is the engagement that prevents the next one.
What we do: Construct the full scenario set across your countries, registrations, classifications and transaction types. Propose expected treatment for every scenario, flagging those that need a tax decision rather than guessing. Execute, record actuals, and triage every failure to a root cause and an owner group.
You receive: A scenario pack with reviewer sign-off columns — your audit evidence. A defect log with root cause and owner per defect. Coverage reporting by treatment and country.
Not included: Tax advice; expected results are a baseline requiring your sign-off. Rate validation, which is your engine vendor's content. Remediation — we identify and scope it; fixing is separate.

TAXENTRIQ Reconcile

Reconciliation and assurance

When: You cannot demonstrate that what posted, what determination said, and what was filed agree. An audit is approaching and the trail from document to return cannot be reconstructed.
What we do: A three-way reconciliation by country, period and tax code. Two independent variances: posted-versus-determination isolates faults between the engine and the ledger, posted-versus-filed between the ledger and the return.
You receive: Every variance classified and explained, an exception register with reasons, and period reporting by country. Unexplained items stay open — they are not netted away.

TAXENTRIQ Operate

Managed tax technology

When: The programme team has gone and nobody owns determination in the run organisation. Engine content updates arrive and nobody regression-tests them.
What we do: Run the landscape. Incident resolution against defined priorities, engine content application and testing, changes within the agreed design, and a scheduled run calendar — content cycles, regression on every change, period-close reconciliation and quarterly registration and mandate scans.
Why it works: Reactive support keeps a landscape alive; the schedule is what keeps it correct. Determination decay is silent, and nobody raises a ticket for a problem they cannot see. The scheduled work is the service.

05 — How we work

Four commitments.

Engine-agnostic

We work across ONESOURCE, Vertex and native SAP, with no stake in which you chose. Independence is usually the fastest route to an answer.

Fixed scope, fixed fee

Every engagement states what is included, what is excluded, and what you receive. You know what you are buying before it starts.

People hold the judgement

Our tooling accelerates scenario coverage and defect analysis. It does not make tax decisions — judgemental items are flagged for a qualified reviewer, never guessed.

Evidence, not assurances

Deliverables are built to be shown to an auditor: scenario sets with sign-off, defect logs with root cause and owner, reconciliations with explained variances.

Coverage

Tax engines: Thomson Reuters ONESOURCE · Vertex · Native SAP · Engine selection and migration
ERP: SAP S/4HANA (on-premise and cloud) · ECC 6.0 · Central Finance · SAP Ariba
Tax types: VAT / GST · US sales & use tax · Withholding tax · Import and acquisition VAT · Statutory localisations
Reach: Global delivery, with experience across 100+ countries in North America, LATAM, EMEA and APAC

Engagement paths

→Not sure where the risk is — Assess, then act on what it finds.
→Programme or cutover approaching — Test, adding Config where remediation is needed.
→New country, acquisition or engine migration — Codes, then Config, then Test.
→Live and stable but unproven — Test once, then Reconcile periodically.
→Programme team gone, nobody owns it — Operate, with Test on the change cycle.

06 — For systems integrators

We deliver under your paper.

A large share of our work is subcontract delivery to primes running S/4HANA programmes who need the tax determination workstream covered by people who have done it before. Your client, your methodology, your templates.

Non-circumvention, addressed first

We will not approach your client during the engagement or after it, and we will sign that before the first call rather than negotiate it after you raise it.
Named consultants, not a bench

You get the people you interviewed. Practitioners only — there is no pyramid underneath us to feed.
Either commercial shape

Day rate against your SOW, or fixed-scope for a defined deliverable such as a determination regression pack.
Accelerators you can white-label

Engine-specific mapping workbooks, scenario libraries, build registers and reconciliation templates — usable inside your own delivery framework and your own bid.