Correction limits (materiality)¶

Not every GST mistake can be tidied up on your next statement. The ATO lets you fix some errors on a later Activity Statement, but only if the error is small enough and recent enough. If it falls outside those limits, you fix it by revising the original statement instead.

In one line

You can correct a GST error on a later statement only within the ATO's limits — a value limit and a time limit. Outside the limits, you revise the original statement.

Why this matters¶

Fixing an error on your next statement is far simpler than revising an old one. But it is not always allowed. Knowing that limits exist — and roughly how they work — tells you which path to take, so you do not accidentally fix an error the wrong way.

What you will learn¶

That the ATO limits correcting a GST error on a later statement
What the value limit and the time limit mean in plain terms
What to do when an error is outside the limits

Understanding the concept¶

The ATO groups GST errors into two kinds. A debit error means you did not report enough GST, so you owe more. A credit error means you reported too much GST, so the ATO owes you.

Debit errors come with two limits when you want to fix them on a later statement:

A value limit — how big the error can be. The ATO explains this limit depends on your business's GST turnover, and bigger businesses get a higher limit. If the net amount of your debit errors is within your limit, you can correct it on a later statement.
A time limit — how long ago the error happened. Again this depends on your turnover, and there is a set window measured from when the original statement was due. Miss the window and you can no longer carry the fix forward.

Credit errors are treated more gently. The ATO does not apply a value limit to a credit error, though there is still a time period during which it can be corrected.

If a debit error is too big or too old to fit the limits, you cannot fix it on a later statement. Instead you revise the original statement for the period the error was made in.

The exact dollar figures for the value and time limits are set by the ATO, are based on turnover, and change over time — so always check the current figures on the ATO website rather than relying on a number you saw once.

For accountants & bookkeepers

The ATO sets both a debit error value limit and a debit error time limit against tiers of current GST turnover, so a larger business gets a larger value limit and, for some tiers, a longer window. The net sum of debit errors is reduced by any credit errors included on the same statement. If the net sum exceeds the value limit, you can correct up to the limit and revise the balance in the period the error was made. Credit errors carry no value limit but must fall within the period of review for the earlier period. Treat the published tiers as the source of truth and check them each time — do not memorise the dollar figures.

Example¶

Sam runs a small landscaping business with modest turnover. Preparing this quarter's BAS, Sam realises last quarter's GST was understated by about $300 — a debit error. Because $300 sits well within the value limit for a business Sam's size, and last quarter is well inside the time limit, Sam is allowed to add the $300 to this quarter's statement rather than revising the old one.

Now picture a different case. Sam finds an older debit error of several thousand dollars from a couple of years back. That amount is above the value limit for the business, and it is too far in the past to sit inside the time limit. So Sam cannot carry it forward. Instead Sam revises the original statement for the quarter the error was made in.

The takeaway is the same in both cases — check the size of the error and how old it is against the ATO's current limits, then choose to carry it forward or to revise.

Common mistakes¶

Assuming any GST error can be fixed on the next statement — big or old debit errors cannot.
Trying to memorise the dollar limits — they are turnover-based and change; look them up on the ATO website each time.
Forgetting that credit errors and debit errors are treated differently.
Ignoring the time limit and focusing only on the size of the error, or the other way around — both must be satisfied.

How this works in myaccountant¶

In the app — when a GST error is small enough and recent enough to fit the ATO's limits, myaccountant lets you carry the correction onto a later Activity Statement. When an error falls outside the limits, myaccountant instead lets you revise the original statement for the period the error was made in.

Key points¶

The ATO lets you fix some GST errors on a later statement, but only within limits.
A value limit caps how big a debit error can be; bigger businesses get a higher limit.
A time limit caps how long ago the error can have happened.
Credit errors have no value limit but still have a time period.
The dollar figures are turnover-based and change — check the ATO for current limits.
An error outside the limits is fixed by revising the original statement.

Learn next¶

General information only — not tax, super or financial advice.

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