Editorial Policy

Purpose of our content

UK Tax Toolbox publishes practical UK tax calculators and guidance for people trying to understand salary income, Self Assessment, sole trader profit, rental income, online reselling, creator income, digital products and side hustles. Our aim is to make common tax concepts easier to understand before users check their position with HMRC or a qualified adviser.

Author and founder perspective

Content is produced and maintained by UK Tax Toolbox, led by founder Conor Dwyer. Practical business experience informs the site's focus on records, cash flow, deadlines, platform income, expenses and common calculation mistakes. We do not present that experience as a professional tax-adviser or accountant qualification.

We do not present this experience as a professional tax adviser qualification. Our guidance remains informational and should be checked against HMRC guidance or a qualified adviser where personal decisions are being made.

How pages are researched

HMRC and GOV.UK are the primary sources for rates, allowances, filing rules and tax-treatment explanations used by UK Tax Toolbox. Calculator pages link to the most relevant official material so users can inspect the source behind an assumption instead of relying on an unsupported summary.

We then add practical examples around records and common earning patterns, such as PAYE income alongside self-employment, marketplace fees, creator payouts, rental costs and payments on account. Examples are illustrations rather than claims that one tax treatment fits every user.

Supported tax years and assumptions

Each calculator states the tax year or tax-year choices it supports. The main tools currently include 2026/27 assumptions where shown and some also retain earlier-year comparisons. A result is only an estimate based on the fields exposed by that tool; it is not a full HMRC tax computation.

Important exclusions are stated on individual calculator pages. A simple tool may not model Scottish Income Tax, tax codes, every allowance or relief, capital gains, VAT, company structures, foreign income, losses, benefit interactions or unusual personal circumstances unless the page explicitly says it does.

Review and updates

Rates and assumptions are checked when a new tax year is introduced or when HMRC or GOV.UK publishes a material rule change affecting a calculator. Substantive content pages are also reviewed when their source guidance changes. A visible review date records when a page was last checked or materially updated; it is not a guarantee that a rule cannot change afterwards.

Corrections

If we find an error, unclear explanation or outdated assumption, we aim to correct it promptly. Users can report possible issues through the contact page. Helpful correction reports include the page URL, the section or calculator field involved, and a short explanation of the concern.

Advertising independence

UK Tax Toolbox may display advertising, including through services such as Google AdSense. Advertising does not decide our editorial conclusions, calculator assumptions or guide topics. We do not allow advertisers to edit tax guidance or calculator results.