Enterprise Tax
Architecture Framework
A structured framework for examining the layers of enterprise tax architecture — from business model through governance. Each layer has distinct purposes, decisions, dependencies, and failure modes.
This framework represents a conceptual architecture pattern. Actual architecture design requires validation against organizational requirements, SAP configuration, and jurisdictional obligations.
Architecture Layers at a Glance
Business Model
Defines the commercial activities, revenue streams, and transaction types that generate tax obligations.
Key Decisions
- • Which legal entities are in scope?
- • What products and services are sold?
- • Which customer and vendor channels are used?
- • What intercompany transactions exist?
Common Failure Points
- • Incomplete entity scope
- • Unrecognized transaction types
- • Missing jurisdictional obligations
Responsible Stakeholders
Legal Entity Model
Maps the corporate structure to SAP company codes and determines which entities have which tax obligations.
Key Decisions
- • How do legal entities map to SAP company codes?
- • Which entities are VAT/GST registered?
- • Which entities have withholding obligations?
- • How are intercompany transactions structured?
Common Failure Points
- • Incorrect company code to entity mapping
- • Missing tax registrations in SAP
- • Incorrect intercompany tax treatment
Responsible Stakeholders
Jurisdiction Model
Defines the geographic and regulatory scope of tax obligations across countries, states, and localities.
Key Decisions
- • Which jurisdictions require tax registration?
- • How are jurisdiction codes maintained in SAP?
- • How are cross-border transactions classified?
- • How are digital services taxed?
Common Failure Points
- • Incorrect jurisdiction assignment
- • Missing local tax codes
- • Incorrect nexus determination
Responsible Stakeholders
Tax Policy
Translates legal tax obligations into operational rules, rates, and procedures implemented in SAP and tax engines.
Key Decisions
- • How are tax policies documented and maintained?
- • Who owns tax policy changes?
- • How are policy changes tested before go-live?
- • How are exceptions managed?
Common Failure Points
- • Undocumented tax policy
- • Uncontrolled policy changes
- • Inconsistent policy across systems
Responsible Stakeholders
Process Architecture
Defines the end-to-end tax processes from transaction origination through filing and payment.
Key Decisions
- • Which processes are automated vs. manual?
- • Where do tax decisions occur in each process?
- • How are exceptions escalated?
- • How are period-end processes managed?
Common Failure Points
- • Manual processes at scale
- • Unclear process ownership
- • Undocumented exception handling
Responsible Stakeholders
Master Data
Provides the foundational data — customers, vendors, materials, plants, tax codes — that drives tax determination.
Key Decisions
- • Which master data fields drive tax determination?
- • Who owns each master data element?
- • How is master data quality monitored?
- • How are changes governed?
Common Failure Points
- • Incorrect tax classifications
- • Missing tax-relevant fields
- • Inconsistent data across systems
Responsible Stakeholders
Tax Determination
The logic that identifies which tax applies to a transaction based on master data, jurisdiction, and business rules.
Key Decisions
- • Where does determination occur — SAP or tax engine?
- • How are determination rules maintained?
- • How are edge cases handled?
- • How is determination tested?
Common Failure Points
- • Incorrect tax code selection
- • Missing determination rules
- • Untested edge cases
Responsible Stakeholders
Tax Calculation
Computes the tax amount based on the determined tax type, rate, base amount, and applicable rules.
Key Decisions
- • Where does calculation occur?
- • How are rate changes managed?
- • How are exemptions applied?
- • How is rounding handled?
Common Failure Points
- • Incorrect rate application
- • Missing exemption logic
- • Rounding errors at scale
Responsible Stakeholders
Integration
Connects SAP to tax engines, government portals, compliance platforms, and other systems in the tax landscape.
Key Decisions
- • Which integration pattern is appropriate?
- • How are errors handled?
- • How is integration monitored?
- • How are retries managed?
Common Failure Points
- • Silent integration failures
- • Data loss in transit
- • Unmonitored error queues
Responsible Stakeholders
Tax Posting
Records tax amounts in SAP financial documents, tax accounts, and the general ledger.
Key Decisions
- • How are tax accounts structured?
- • How are posting keys configured?
- • How are corrections posted?
- • How are period-end accruals handled?
Common Failure Points
- • Incorrect tax account assignment
- • Missing tax postings
- • Unreconciled tax balances
Responsible Stakeholders
Reconciliation
Validates that tax amounts in SAP agree with tax engine outputs, filed returns, and accounting balances.
Key Decisions
- • What reconciliation layers are required?
- • How frequently is reconciliation performed?
- • How are differences investigated?
- • How are adjustments documented?
Common Failure Points
- • Undetected differences
- • Infrequent reconciliation
- • Undocumented adjustments
Responsible Stakeholders
Controls
Preventive, detective, and corrective controls that ensure tax processes operate as intended.
Key Decisions
- • Which controls are automated vs. manual?
- • How are control failures escalated?
- • How are controls tested?
- • How is evidence retained?
Common Failure Points
- • Undetected control failures
- • Missing evidence
- • Untested controls
Responsible Stakeholders
Compliance Reporting
Produces statutory returns, digital reports, and audit files required by tax authorities.
Key Decisions
- • Which reporting formats are required?
- • How is data extracted from SAP?
- • How is data validated before submission?
- • How are submissions tracked?
Common Failure Points
- • Incorrect data extraction
- • Missing validation
- • Untracked submissions
Responsible Stakeholders
Governance
Oversight of tax architecture, configuration changes, vendor management, and continuous improvement.
Key Decisions
- • Who approves architecture changes?
- • How are configuration changes controlled?
- • How are vendors managed?
- • How is performance measured?
Common Failure Points
- • Uncontrolled changes
- • Unclear ownership
- • Missing governance documentation
Responsible Stakeholders
Assess Your Tax Architecture
The free 10-hour discussion includes a structured review of your current-state architecture and key design questions.
Start the Free Discussion