Editorial Standards

Source hierarchy

When building or updating a calculator, we always prefer the most authoritative source available, in this order:

1. Official government sources (LHDN's PCB schedules, PERKESO's contribution tables, TNB's tariff blocks, EPF's dividend declarations, PTPTN's ujrah rates, Tabung Haji's annual hibah).
2. National regulators (BNM for reference rates and financial policy, Suruhanjaya Tenaga for ICPT, NAPIC for property data).
3. Recognised professional bodies (WHO for BMI classification, state zakat authorities such as LZS, PPZ-MAIWP).
4. Peer-reviewed academic papers (e.g. Mifflin–St Jeor 1990 for TDEE), where a topic has no official government source.

Every calculator page links to its underlying sources in the 'Sources & references' section at the bottom of the page. If a source can't be publicly verified, we don't use it.

How formulas are built

Every formula is written in TypeScript and verified against official figures before publishing. For LHDN, we run every tax bracket against the official e-PCB calculator. For EPF, we test against the example scenarios published in EPF's annual report. For TNB, we run multiple usage profiles (200, 500, 800, 1500 kWh) against TNB's official bill calculator.

We also maintain an automated smoke-test suite that runs on every deploy. Every calculator has at least one numeric expectation pinned — for example, 'RM500k home loan at 4.2%, 30 years = installment RM2,200 ± RM50'. If a test fails, the deploy is blocked.

Update cadence

We follow a structured update calendar so no tax bracket or tariff rate is missed:

• Quarterly: Full editorial pass over every calculator. The most recent pass is recorded in version control and shown as 'Last reviewed' on every page.
• After the federal budget: Tax brackets and reliefs are updated within 14 days of the Finance Bill being tabled in Parliament.
• EPF and Tabung Haji declarations: Default dividend rates are updated within 7 days of declaration.
• TNB ICPT reviews: Verified against Suruhanjaya Tenaga's announcements every January and July.
• Ad-hoc revisions: When a user reports a bug or a policy change, we aim to verify and publish the correction within 48 hours on weekdays.

What our calculators are NOT

We repeat this throughout the site because it matters: CalculatorHub provides estimates for personal planning. We don't provide tax advice, investment advice, or legal advice. For:

• Actual income tax filing — use LHDN's e-Filing or consult a licensed tax consultant.
• Major investment decisions — speak with a licensed IFA or unit trust adviser.
• Loan applications — bank underwriters will use their own internal formulas that may differ.
• Actual zakat payments — verify with your state zakat authority (LZS, PPZ, MAIK, etc.).

Corrections

We make mistakes. When we do, we correct them openly. Email hello@calculatorhub.my with the details (which calculator, what inputs you used, what figure you expected, and a reference source if you have one), and we'll investigate. When we publish a correction, it updates the 'Last reviewed' date on that page. For major corrections that affect large ringgit amounts, we'll add an acknowledgment note in the calculator's 'Notes' section.

Advertising disclosure

CalculatorHub is funded by Google AdSense (Auto Ads) display advertising. Advertisers do not influence which calculators we build, the editorial content we publish, or the formulas we use. When a calculator links to a financial provider (e.g. a lender) under a disclosed partnership, we label it as a partnership link openly on the relevant page.

Questions

If you have questions about our editorial standards, email hello@calculatorhub.my.