Methodology and sources

Source hierarchy

We first consult legislation and official pages, releases, tables and guidance from Hong Kong government departments, statutory bodies and regulators, including the Inland Revenue Department, MPFA, Labour Department, Housing Authority, Transport Department and HKMA. Where official material does not cover a point, we use clearly identified standard financial formulas or market conventions.

Calculation models

Depending on the tool, we use statutory formulas, compound interest, amortisation schedules, internal rates of return, month-by-month cash flows or scenario comparisons. Inputs are generally calculated at full precision and rounded only for display. Tool-specific rounding rules are explained on the relevant page.

Assumptions and defaults

Defaults are examples for convenient exploration; they are not market quotations, personal recommendations or forecasts. Interest, inflation, investment returns, property prices and rent growth can all change. A result reflects only your inputs and the assumptions stated by the tool.

Testing and quality checks

• Core calculations are automatically tested against known cases, boundary values and multiple scenarios.
• Every tool must have distinct guidance, common questions and at least one authoritative source.
• Chinese and English pages are checked for translation coverage, canonical URLs and hreflang pairing.
• Reference links and time-sensitive information are reviewed periodically.

Review dates

The sources section of a tool shows its latest review date. This means the content was checked; it does not mean every official rule changed on that date. If an authority publishes a later rule, the latest official publication takes priority.

Corrections and reports

If you find a possible error, use the contact page and include the tool name, full inputs, expected and actual results, and an official source that can be checked. We prioritise issues that may affect statutory entitlements, tax or significant financial decisions.