Editorial Policy
CalcKit is built on one principle: if the numbers are wrong, the tool is worthless. This page explains how we research, write, and maintain everything on this site.
Last updated: 20 May 2026
In short
- ✓All tools use current UK tax rates sourced directly from HMRC and GOV.UK.
- ✓Tools and articles are reviewed at the start of every tax year and after every Budget.
- ✓No sponsored content, no affiliate links, no paid placements.
- ✓Every article is written by a named author — not anonymously or by AI alone.
- ✓Errors are corrected within 5 working days of being reported.
Our editorial principles
Accuracy first
Every calculator and article is built around verified UK rates and legislation. We cross-reference HMRC, GOV.UK, and the Office for National Statistics before publishing any figure.
Updated every tax year
We review all tools and articles at the start of each new UK tax year (April). Any mid-year changes — Budget announcements, emergency legislation — are updated within 5 working days.
Primary sources only
We use primary government sources: HMRC for tax rates and thresholds, Land Registry for property data, ONS for economic statistics. We do not rely on third-party summaries.
Editorially independent
CalcKit has no advertisers, sponsors, or affiliate arrangements that influence our calculator results or editorial content. No tool or article is paid for or commercially influenced.
Named authorship
Every article published on CalcKit is written and reviewed by Muhammad Murtaza, founder of CalcKit. We do not publish anonymous or AI-only content.
Clear limitations
Our tools are for estimation and guidance. We clearly state where calculations are simplified (for example, where income spans multiple tax bands or where individual circumstances vary).
How our calculators are built and maintained
Each calculator is built against the current UK tax year rates at the time of publication. The calculation logic is written in TypeScript and is open to inspection — you can view the source of any result by checking the browser console or examining the page source.
Tax rates, thresholds, and rules are stored in a central configuration updated with each tax year. When HMRC announces a rate change, we update the central config and rebuild. This ensures all tools that share a rate (for example, the income tax rate used by the salary sacrifice calculator and the income tax calculator) stay in sync.
We test all calculators against HMRC's own published worked examples and, where available, HMRC's own digital tools (such as the HMRC tax calculator) to verify accuracy.
Where a tool involves simplified assumptions — for example, our mortgage affordability calculator uses standard income multiples rather than a full affordability assessment — we clearly state those assumptions on the tool page.
Article and guide standards
All articles on CalcKit are written to inform, not to sell. We do not write content designed to funnel readers towards a product or service. We do not accept sponsored articles or paid placements.
Articles include the date of publication and the date of last review. Any article older than 12 months that covers time-sensitive topics (tax rates, thresholds, legislation) is reviewed and updated before each new tax year.
Where an article refers to specific tax figures, those figures are sourced from HMRC or the relevant government body and are accurate as of the stated date. Historical figures are clearly labelled as such.
We use AI writing tools as a research and drafting aid only. All final content is reviewed, edited, and approved by a named human author before publication. We do not publish AI-generated content without human review.
Primary sources we use
Found an error?
If you believe a calculator result or article figure is incorrect, please let us know. We take accuracy seriously and will investigate and correct any verified errors within 5 working days.
Report an error →