WCAG Colour Contrast Requirements in Australia

In Australia, website colour contrast is measured against WCAG Level AA: at least 4.5:1 for normal text, 3:1 for large text and 3:1 for UI components. The Disability Discrimination Act does not name the numbers; the Human Rights Commission's guidance does, and that is what complaints are judged against.

This guide is general information, not legal advice.

The legal basis

The Disability Discrimination Act 1992 (DDA) makes it unlawful to discriminate against a person with disability in providing goods, services and facilities. Since Maguire v SOCOG in 2000 it has been settled that this includes websites. The DDA is technology-neutral, so the technical benchmark comes from the Australian Human Rights Commission's advisory notes, which point to WCAG 2.x Level AA and say the Commission will treat it as the standard when assessing complaints.

Government is stricter. The federal Digital Service Standard requires agency services to meet WCAG 2.2 Level AA, and most state governments have matching policies. Vendors building for government inherit the requirement through procurement. Private businesses have no mandated version, but WCAG 2.1 AA is the floor an auditor or conciliator will use, and 2.2 adds nothing new on contrast.

The exact WCAG numbers

• 4.5:1 for normal text (Success Criterion 1.4.3, Level AA).
• 3:1 for large text: 14pt (about 18.66px) bold, or 18pt (24px) regular.
• 3:1 for UI components and meaningful graphics such as icons, input borders, focus rings and chart lines (1.4.11, Level AA, added in WCAG 2.1).
• 7:1 and 4.5:1 at Level AAA (1.4.6); not required by any of the laws discussed here.
• Logos and purely decorative text are exempt; disabled controls are exempt.

Real pairs, measured

Common failures on Australian sites

• White text on gold, sky blue or coral brand colours; swap to dark text instead.
• Light-gray legal text in footers for ABN, terms and privacy links.
• Map and chart legends that rely on hue alone (fails 1.4.1 as well).
• Disabled-looking buttons that are actually enabled, set below 3:1.
• PDF statements and invoices that were never checked, which the DDA covers too.

How complaints work in Australia

There is no regulator scanning Australian websites. The DDA is enforced by complaint: a person lodges one with the Australian Human Rights Commission, the Commission attempts conciliation, and if that fails the complainant can take the matter to the Federal Court. Most web complaints settle in conciliation with an agreement to fix the issues on a timeline. Contrast failures are the first thing a complainant's adviser will document because the ratio is objective, so being able to produce your own measured report, and a fix date for any failures, usually ends the matter there.

Government is different: agencies must meet the Digital Service Standard to launch or keep a service, and vendors are held to it through contracts. If you build for federal or state government, expect WCAG 2.2 AA to be a stated acceptance criterion with an independent audit.

Picking compliant brand colours

Green and gold is the national example of the problem: gold cannot carry white text, and gold on green fails for small text. The answer is roles, not a rebrand. Use gold behind dark text, green behind white text, and derive a darker shade of each for links. Measure dark mode on its own. Sky blue, coral and sand tones, popular in Australian consumer brands, almost never carry white text; pair them with #1F2937 or black. Keep one documented pair per role and reuse it, including in the native app if you have one.

Edge cases

• Text over photography on hero banners: measure against the lightest pixel or add a solid panel.
• Placeholder text counts; disabled controls do not.
• Logos are exempt; the same colour used for link text is not.
• Embedded payment, booking and chat widgets are part of your service in a complaint.
• PDF statements and invoices are covered by the DDA just as web pages are.

State and territory governments follow the same path: New South Wales, Victoria and Queensland each publish digital standards that reference WCAG 2.1 or 2.2 AA for agency websites, and local councils are increasingly held to the same bar through their state policies. If you sell to any level of Australian government, build to 2.2 AA from the start rather than retrofitting after an audit.

How to check your site

1. List every text style and its background: body, secondary, links, buttons, placeholders, footer, error and success states, dark mode if you have one.
2. Paste each pair into the contrast checker. It reports the ratio and AA/AAA status for normal and large text.
3. For pairs that fail, keep the hue and move only the lightness until the ratio passes. The palette generator shows tints and shades of your brand color so you can pick the nearest passing one.
4. If the brand colors came from a logo or mockup, pull the exact values with the image extractor rather than eyeballing them.
5. Check icons, borders and focus rings against their adjacent colors for 3:1.
6. Record the results. A dated table of pairs and ratios is the evidence an auditor, regulator or opposing counsel will ask for.

Australian complaints go through conciliation before court, and a measured contrast report plus a fix timeline is usually enough to resolve a contrast complaint at that stage. Build the report once and keep it current.