Effective Tax Rate is the actual rate of tax a company pays on its accounting or economic profit, reflecting deductions, credits, and timing differences.
The Effective Tax Rate (ETR) is the ratio of total income tax expense to pre-tax accounting profit. It is the headline number investors look at because it captures the combined impact of statutory rates, deductions, credits, exemptions, and tax planning.
A company with a 21% statutory rate may report an ETR of 14% thanks to R&D credits, patent boxes, and tax-loss usage, or 28% because of permanent disallowances and foreign withholding tax.
For financial reporting (IFRS / US GAAP), the ETR is total income-tax expense (current plus deferred) divided by pre-tax profit. For Pillar Two purposes, the GloBE ETR is computed differently: jurisdiction-by-jurisdiction, using GloBE income (a tax-adjusted accounting figure) and covered taxes, and compared to a 15% minimum.
ETR is the right input for cash-flow projections, valuation models, and group structure design. Headline rates are misleading: the relevant question is what rate actually applies to your business after deductions, treaty relief, and incentives. ETR is also used to benchmark group structures and identify pockets of overtaxation or undertaxation that may attract scrutiny.
You will compute and discuss ETR during board reporting, investor due diligence, M&A analysis, and tax-planning reviews. It also appears in Pillar Two compliance, where the per-jurisdiction GloBE ETR drives whether a top-up tax applies, and in management reporting that compares forecast versus realised tax burden.
See what a company actually costs in year one, and how the jurisdictions compare on tax, capital and timeline.
