Business

IR35 Pay Difference Calculator

Compare outside vs inside IR35 net.

Use the interactive calculator below for an instant estimate. Results depend on your inputs and the assumptions shown on the page.

Methodology and source status

Scope: UK VAT, payroll, company-tax, cash-flow, and small-business estimates.

Primary reference: GOV.UK Income Tax rates and allowances.

Source record: Direct statutory or government source. This link is the calculator-specific evidence path, not a statement that every individual input or exception is current.

Effective period: Check the linked GOV.UK guidance and the applicable UK nation, tax year, reliefs and allowances before relying on an estimate.

Review status: Source path published; no named calculator-level review is currently represented here.

Last source or expert review: No calculator-level source or expert review date is published.

Technical validation: 12 August 2026 — catalogue build, route, metadata, and internal-link checks completed. This is a technical delivery check, not a review of current rates, rules, sources, calculations, or personal circumstances.

Next review trigger: Review when a relevant rate, threshold, provider fee, tax period, rule, or formula changes.