Writing archive
Thoughts
A structured archive of writing on Pillar Two, tax technology, data, and AI. The goal is not a simple chronological blog, but a growing body of connected work that is easy to navigate by topic.
Start Here
Begin with the main guide for the Pillar Two fundamentals series.
Topic Clusters
The archive is organized by subject so related articles reinforce each other instead of feeling like isolated posts.
Pillar Two Fundamentals
Core concepts, charging rules, and the basic mechanics of the global minimum tax regime.
Pillar page OECD Pillar Two Explained: The Ultimate Guide to Global Minimum Tax Broad foundation article covering the purpose, mechanics, and core rules.- Cluster articleIncome Inclusion Rule (IIR)How top-up tax is collected at parent level.
- Cluster articleUndertaxed Profits Rule (UTPR)How residual top-up tax is collected.
- Cluster articleQualified Domestic Minimum Top-up Tax (QDMTT)How jurisdictions retain tax rights locally.
- Cluster articleTop-Up Tax ExplainedHow the 15% shortfall is calculated.
- Cluster articleEffective Tax Rate (ETR)How low-tax outcomes are measured.
- Cluster articleSubstance-Based Income Exclusion (SBIE)Why not all profit is exposed.
- Cluster articlePillar Two Rule Order ExplainedHow QDMTT, IIR, and UTPR interact.
- Cluster articlePillar Two Safe HarboursTransitional relief and why 2027 matters now.
Pillar Two Data Readiness
Practical writing on the data, systems, controls, and operating model work needed to make GloBE reporting repeatable.
Pillar page Pillar Two Data Readiness: How to Get Your Data, Systems, and Controls Ready for GloBE Parent guide for the data, systems, controls, and operating model work behind GloBE reporting.- Cluster articleAdjustment Ledgers for Pillar Two: How to Track GloBE and Covered Tax AdjustmentsWhy repeatable GloBE reporting needs a structured adjustment ledger, clear ownership, evidence, and automation status tracking.
- Cluster articlePillar Two Data Ownership: Why Tax Cannot Solve the Reporting Problem AloneHow finance, tax, consolidation, local controllers, and technology teams need clear ownership for repeatable GloBE reporting.
- Cluster articlePillar Two Evidence and Controls: What Tax Teams Need to Retain for GloBE ReportingHow to think about audit trail, source evidence, review controls, approvals, and documentation for Pillar Two calculations.
- Cluster articleWhy Pillar Two Is a Data Problem Before It Is a Calculation ProblemWhy the hardest implementation work often sits in source data, ownership, adjustment logic, and evidence.
- Cluster articleWhat a Pillar Two Data Assessment Should Actually CoverHow to test sources, definitions, adjustments, ownership, evidence, and repeatability.
- Cluster articleSource Systems for Pillar Two: Why Trial Balance Alone Is Not EnoughWhy GloBE-ready reporting requires tax, consolidation, local, and manual support layers.
Full Article Index
A date-free index for scanning the full Pillar Two fundamentals series by topic.
- Pillar page · Pillar Two Data ReadinessPillar Two Data Readiness: How to Get Your Data, Systems, and Controls Ready for GloBEParent guide for data, systems, controls, and repeatable GloBE reporting.
- Cluster article · Pillar Two Data ReadinessAdjustment Ledgers for Pillar Two: How to Track GloBE and Covered Tax AdjustmentsWhy repeatable GloBE reporting needs a structured adjustment ledger, clear ownership, evidence, and automation status tracking.
- Cluster article · Pillar Two Data ReadinessPillar Two Data Ownership: Why Tax Cannot Solve the Reporting Problem AloneHow finance, tax, consolidation, local controllers, and technology teams need clear ownership for repeatable GloBE reporting.
- Cluster article · Pillar Two Data ReadinessPillar Two Evidence and Controls: What Tax Teams Need to Retain for GloBE ReportingHow to think about audit trail, source evidence, review controls, approvals, and documentation for Pillar Two calculations.
- Cluster article · Pillar Two Data ReadinessWhy Pillar Two Is a Data Problem Before It Is a Calculation ProblemHow data, ownership, adjustment logic, and evidence shape Pillar Two implementation.
- Cluster article · Pillar Two Data ReadinessWhat a Pillar Two Data Assessment Should Actually CoverHow to test sources, definitions, adjustments, ownership, evidence, and repeatability.
- Cluster article · Pillar Two Data ReadinessSource Systems for Pillar Two: Why Trial Balance Alone Is Not EnoughWhy GloBE-ready reporting requires tax, consolidation, local, and manual support layers.
- Cluster article · Pillar Two FundamentalsPillar Two Safe Harbours: Transitional Relief, Tightening Tests, and Why 2027 MattersBridge article from fundamentals into future data-readiness work.
- Cluster article · Pillar Two FundamentalsPillar Two Rule Order Explained: How QDMTT, IIR, and UTPR InteractHow taxing rights move across the rule order.
- Cluster article · Pillar Two FundamentalsSubstance-Based Income Exclusion (SBIE): Why Not All Profit Is Subject to Pillar TwoHow routine returns reduce the exposed profit base.
- Cluster article · Pillar Two FundamentalsEffective Tax Rate (ETR) Under Pillar Two: How Low-Tax Outcomes Are MeasuredHow jurisdictional ETR drives exposure analysis.
- Cluster article · Pillar Two FundamentalsTop-Up Tax Explained: How the Pillar Two 15% Minimum Is CalculatedHow the shortfall becomes an operational tax amount.
- Cluster article · Pillar Two FundamentalsQualified Domestic Minimum Top-up Tax (QDMTT): How Jurisdictions Retain Pillar Two Tax RightsHow local jurisdictions collect top-up tax first.
- Cluster article · Pillar Two FundamentalsUndertaxed Profits Rule (UTPR): How Residual Pillar Two Top-Up Tax Is CollectedHow residual top-up tax is allocated across jurisdictions.
- Cluster article · Pillar Two FundamentalsIncome Inclusion Rule (IIR): How Pillar Two Top-Up Tax Is CollectedHow the primary charging rule works at parent level.
- Pillar page · Pillar Two FundamentalsOECD Pillar Two Explained: The Ultimate Guide to Global Minimum TaxMain hub for the Pillar Two Fundamentals cluster.