⏱ 9 min read

Looking up a competitor’s GST-linked activity sits in a gray area for a lot of business owners — it feels like it should either be obviously fine or obviously off-limits, but the real answer depends on exactly what information you’re looking at and how you plan to use it.

This guide covers what’s actually publicly available, where the legitimate line sits, and how to use this kind of information responsibly.

None of this is legal advice for a specific situation — where real doubt exists, especially around an unusual or high-stakes case, a qualified legal or compliance professional is worth consulting directly.

1. What GST-Linked Information Is Actually Public

Registration Status and Basic Details

Basic registration status for a GST number is generally available through the official portal for anyone with the registration number to search against — this is by design, not a loophole.

This kind of check is routine and widely used — confirming a counterparty’s registration is active before entering into a transaction is standard practice, not something that requires special justification.

Aggregated Activity Data

Beyond basic status, aggregated activity figures compiled from public filings are offered by various data services — this is a step further than a simple status check but still built from legitimately public underlying records.

The key distinction is that these services aggregate and organize what’s already public rather than accessing anything that wouldn’t otherwise be available to a determined manual search.

2. Where the Line Actually Sits

Legitimate Research vs Overreach

Using publicly available registration and activity data to understand a competitor’s general scale is standard business research. Attempting to obtain non-public information — through impersonation or misrepresentation, for instance — crosses well outside that.

Most legitimate use of this data falls comfortably on the public-research side of that line, which is worth keeping in mind if the topic feels murkier than it actually is.

Why Intent and Method Matter

The same underlying data point can be entirely legitimate to look up directly and inappropriate to obtain through deceptive means — the method matters as much as the information itself.

A useful test is whether the method used would be reasonable to explain openly to the business in question — if not, that’s a sign the method itself, not the data, is the problem.

3. Using This Kind of Information Responsibly

Treat It as One Input, Not a Complete Picture

Activity data tied to a competitor’s GST filings says something about scale, but nothing about profitability, strategy, or intent — treating it as one input among several avoids overreading a limited signal.

Combining it with other, more qualitative research generally produces a far more reliable picture than relying on this figure alone to draw a firm conclusion.

Stick to Structured, Reputable Sources

Sourcing this kind of information through a structured data service that draws from public filings is a more defensible and reliable approach than informal or unverified channels.

It also tends to be more accurate, since a reputable service has an incentive to maintain data quality in a way an informal or anonymous source typically does not.

Frequently Asked Questions

Is it illegal to look up a competitor’s GST registration status?

No — basic registration status is public information, available to anyone with the registration number to search against.

This is one of the more common and least controversial uses of public GST data, comparable to checking any other public business registry.

What crosses the line?

Attempting to obtain non-public information through deceptive or unauthorized means — not the act of researching public information itself.

If in doubt, ask whether the same information could reasonably be obtained through an open, straightforward request — if not, that’s a reasonable signal to step back.

Quick Recap

Basic GST registration and aggregated activity data are legitimately public and fine to use for general competitive research. What matters is sticking to public sources and honest methods, and treating the result as one input rather than a complete picture.

For how this fits into choosing a service provider generally, see our best gst services for businesses.