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UK finance and tax planning
This hub collects take-home pay sketches, sole trader and dividend models, and adjacent invoice helpers alongside respectful Zakat arithmetic and Australian GST splits. Every page states limits up front: bands, allowances, and filing rules change, so treat outputs as conversation starters with a qualified accountant or advisor, not filings.
Pair calculators with the guides below for worked examples, comparison tables, and long-tail FAQs. For broader US-focused calculators, use the main finance directory.
When to use which UK sketch
Mixed earners often need three different lenses in one afternoon: PAYE-style take-home, sole trader profit after blended tax and NI percentages, and distribution planning after an effective dividend rate. The table maps typical questions to a starting tool; always align inputs with your latest HMRC or payroll pack.
| Scenario | Start here | Why |
|---|---|---|
| Employee or contractor with PAYE-style deductions | Salary after tax (UK) | You supply combined income tax, NI, and pension percentages to approximate net pay. |
| Sole trader profit after blended rates | Self-employed tax (UK) | Uses a single effective tax plus NI percentage you pull from forecasts or your accountant. |
| Director distributions after an effective dividend rate | Dividend tax (UK) | Stacks allowances into the percentage you enter; pair with salary tool when mixing income types. |
| Pricing retained days from an annual after-tax goal | Freelance day rate | Turns target net income and billable days into a floor day rate before discounts. |
Guides with worked examples
Long-form explainers that pair with the calculators in this hub. Open a post, then return here to plug in your own numbers.
2026-05-16
UK self employment, dividends, and PAYE take-home sketches
HMRC rules move; free tools should not pretend to file for you. These calculators mirror advisor percentages for planning, not submissions.
Read guide →2026-05-15
GST vs VAT for Australia and UK operators: comparison table and worked examples
A practical AU vs UK consumption tax comparison with a reference table, inclusive pricing math, and links to GST and VAT calculators plus UK planning hub.
Read guide →2026-05-15
GST inclusive vs exclusive in Australia: the 10% math operators actually get wrong
Ten percent GST is simple arithmetic with brutal social failure modes - usually mislabeling inclusive vs exclusive or applying 10% to the wrong base.
Read guide →2026-05-15
Zakat calculation and nisab: how calculators help without replacing guidance
Zakat is worship with disciplined math - this guide clarifies what calculators can do, why nisab is user-supplied, and where scholars still lead.
Read guide →2026-05-16
Working days in the UK, business days, and time zones
Payroll and SLAs argue about the same integers with different holiday tables. Split UK weekday counts from global business-day counts and log in UTC.
Read guide →
Tools in this cluster
Estimate UK take-home salary after tax and NI.
Sketch take-home profit after income tax and NI percentages.
Estimate net dividends after an effective dividend tax rate.
Turn annual income targets and billable days into a minimum day rate.
Estimate late fees from principal, days overdue, and annual rate.
Add or remove 10% Australian GST on amounts.
Estimate Zakat due when zakatable wealth exceeds your chosen nisab threshold.
Hub FAQs
- Are these HMRC-certified calculators?
- No. They apply the percentages and amounts you type. Use official HMRC guidance, payroll software, or a tax agent for filings and edge cases such as Scottish bands, high income child benefit charge, or payments on account.
- Why list Australia GST and Zakat on a UK hub?
- Teams and households often span geographies. Keeping respectful Zakat arithmetic and Australian GST splits nearby reduces fragmented searches while each tool page still carries its own disclaimers and intent.
- Where should I go for business metrics outside tax?
- Use the business growth directory for ROAS, churn, CAC, and break-even calculators that complement finance planning decks.
Developer utilities live in the developer tools hub. Converters and SLAs live under utilities and converters.