Updated 8 November 2026

Effective date: 8 November 2026

This policy explains what information GSTCal (gstcal.com.au) collects, how it’s used, who it’s shared with and the choices you have. GSTCal is run by Simsim and offers free calculators and guides about Australian goods and services tax (GST). We follow the Australian Privacy Principles in the Privacy Act 1988 (Cth).

• The calculators run in your browser. The amounts you type into a GST calculator are never sent to us or stored by us.
• We don’t have accounts, comments, forms or a newsletter. We only receive personal information if you email us.
• Google shows ads on this site. Google and its partners use cookies to show ads, including ads based on your visits to this and other websites. You can turn off personalised ads at any time.
• We measure visits with Google tools. Google Tag Manager and Google Analytics tell us, in aggregate, which pages people use.

Information you send us. If you email us, we receive your email address, your name if you include it, and whatever you write. We use it only to reply to you.

Information collected automatically. When you visit the site, our hosting provider, our analytics provider and our advertising partner automatically receive technical information, such as:

• your IP address
• your browser type and version, and your operating system
• the pages you visit, the date and time, and the page that referred you

We don’t ask for, and don’t want, sensitive information such as health, political or religious details, or your tax file number or bank details. Please don’t email them to us.

We use information to:

• run the site, keep it secure and fix problems
• reply to your emails
• understand, in aggregate, which pages are useful
• show advertising that pays for the site

We don’t sell personal information.

Cookies are small text files a website stores on your device. Local storage is similar, but stays in your browser.

• Theme setting. GSTCal stores your light or dark mode choice in your browser’s local storage. It isn’t sent to us.
• Analytics cookies. Google Analytics, loaded through Google Tag Manager, sets cookies to count visits and see how pages are used.
• Advertising cookies. Google AdSense sets cookies to show and measure ads. See the advertising section below.

You can block or delete cookies in your browser settings. The calculators work without them. Our Cookie Policy has more detail.

GSTCal uses Google Tag Manager to load Google Analytics. Google Analytics uses cookies to collect information such as the pages you visit, how long you stay, the site that referred you, your approximate location (from your IP address) and your device and browser. We use it only in aggregate, to see which calculators and guides are useful. We don’t use it to identify you.

Google processes this data under Google’s privacy policy. You can stop Google Analytics collecting data about you with the Google Analytics opt-out browser add-on.

GSTCal uses Google AdSense to show ads. In this section, “third-party vendors” means Google and the other ad companies that take part in Google’s advertising network.

• Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites.
• Google’s use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the internet.
• You can opt out of personalised advertising by visiting Google’s Ads Settings. You can also opt out of some third-party vendors’ use of cookies for personalised advertising at www.aboutads.info and optout.networkadvertising.org.

These cookies and web beacons may collect your IP address, browser details and the pages you visit. Google handles that data under its own privacy policy. Read how Google uses information from sites or apps that use its services and Google’s advertising policies.

Opting out of personalised ads doesn’t remove ads. The ads you see will be based on the page you’re reading instead of your past visits.

Visitors in the European Economic Area, the UK and Switzerland are asked for consent before analytics and personalised advertising cookies are used.

The site is hosted on Cloudflare Pages. Cloudflare processes technical information, such as IP addresses, to deliver pages and protect the site from attacks, under Cloudflare’s privacy policy.

We share information only:

• with service providers that run the site for us, namely Cloudflare (hosting) and Google (analytics and advertising), as described above
• when the law requires it, such as a court order, or to protect our rights or the safety of others
• with your consent, in any other case.

Google and Cloudflare operate overseas, including in the United States, so information may be processed outside Australia. We use providers that commit to protecting personal information in line with recognised privacy standards.

GSTCal links to sites we don’t run, such as the Australian Taxation Office. This policy doesn’t apply to them, so read their privacy policies.

GSTCal is for adults and isn’t directed at children under 13. We don’t knowingly collect personal information from children. If you believe a child has emailed us personal information, contact us and we’ll delete it.

• Emails: kept as long as needed to deal with your request, then deleted.
• Hosting, analytics and advertising data: kept by Cloudflare and Google under their own retention policies. Google Analytics data is kept for the period set in our Analytics account, then deleted.

We take reasonable steps to protect the information we hold, including secure HTTPS connections and limited access to our email. No method of transmission or storage is completely secure.

In Australia, under the Privacy Act 1988 (Cth), you can ask to see or correct the personal information we hold about you, deal with us anonymously where practical, and complain if you think we’ve breached the Australian Privacy Principles. We aim to respond within 30 days. If you’re not satisfied with our response, contact the Office of the Australian Information Commissioner (OAIC) at oaic.gov.au or on 1300 363 992.

In the EEA, UK and Switzerland, under the GDPR, you can also ask us to delete or restrict your data, object to processing, receive your data in a portable format, withdraw consent at any time, and complain to your local data protection authority.

In California and other US states with privacy laws, you can ask what personal information is collected and ask for it to be deleted. Advertising cookies may count as “sharing” under these laws. You can opt out through Google’s Ads Settings and the opt-out links above, and we won’t treat you differently for doing so.

If a data breach is likely to cause you serious harm, we’ll notify you and the OAIC under the Notifiable Data Breaches scheme.

We’ll update the effective date at the top of this page when the policy changes.

For privacy questions or requests, email contact@gstcal.com.au.