How Work Decisions calculations are produced

1. User figures take priority over generic assumptions

Pay rates, take-home changes, pension values, commuting costs, working weeks, childcare, shift lengths and rota dates are supplied by the user wherever they can vary materially. We avoid presenting one employer's premium, one tax outcome or one working pattern as universal.

2. Defined conversions and scenario estimates are separated

Simple arithmetic such as multiplying a contractual hourly rate by an entered overtime multiplier is deterministic. A scenario such as assigning a monetary value to commuting time is subjective. The interface keeps those inputs visible so the result can be recalculated with a different assumption.

3. Why there is no personal tax engine

Several decision tools ask for expected take-home pay or the take-home change you reasonably expect. Tax, National Insurance, pensions, benefits, student finance and other deductions can depend on individual circumstances and can change over time. Work Decisions therefore avoids turning a general decision calculator into a personal tax or financial-advice tool.

4. Annualisation

Where a daily or weekly cost recurs only while working, the calculator uses the working-weeks figure entered by the user rather than automatically multiplying by 52. This is particularly important for commuting and childcare comparisons. Annual salary-derived hourly rates are labelled as indicative where they use salary ÷ 52 ÷ contracted weekly hours.

5. Repeating shift rotas

Rota tools represent a schedule as a repeating list of work/off positions and anchor it to a date supplied by the user. The sequence is then repeated through the chosen calendar period. Presets are definitions, not claims that every employer using the same rota name follows the same sequence. The 2-2-3 preset, for example, is explicitly defined on the site; a different employer variation should be entered as a custom pattern.

6. Leave optimisation

The optimiser searches calendar blocks and counts rostered work positions that would need to be taken as leave to connect existing off periods. It does not calculate statutory entitlement, decide whether leave will be approved or determine how an overnight shift is deducted from an employer's leave balance.

7. Calculation checks before release

• formula outputs are checked against independently worked examples;
• zero, boundary and changed-assumption inputs are tested where meaningful;
• repeating-rota outputs are checked against hand-expanded cycle sequences;
• navigation, canonical URLs, sitemap entries and internal links are validated;
• calculator functions are kept separate from editorial copy so content updates do not silently change the arithmetic.

8. Source hierarchy

For your own decision, the employment contract, employer policy, published rota and payroll information are the primary sources for contractual figures. GOV.UK and Acas are used for general employment-rights and working-time context. Work Decisions uses those sources to identify where a planning calculator should stop rather than attempting to replace them.

9. Publisher and corrections

Work Decisions UK is operated and maintained by Airborne Media & Consultancy Ltd. It is a publisher of calculation and planning tools, not an employment-law, payroll, tax or financial-advice service. If a formula, example, link or explanation appears wrong, please report it through the contact and corrections route.

10. Page-level examples and release evidence

Worked examples on calculator and category pages use the same stated formulas or rota engine as the interactive result, but their inputs and intermediate steps remain visible so the arithmetic can also be checked independently. They are illustrative scenarios, not claims about a reader’s pay, entitlement or preferred schedule.

• example inputs are fixed and labelled rather than inferred from the visitor;
• dates in rota examples are regenerated from the stated pattern and anchor date;
• category pages explain which calculator fits which question and include a distinct example;
• editorial changes do not alter calculator functions unless the release specifically identifies a logic change;
• materially reviewed pages receive a new sitemap modification date.

The site-wide content review completed on 17 September 2026 added page-specific worked examples and source boundaries without changing the existing calculator URLs or their calculation logic.