Accounting Solutions Singapore Editorial Team · Last reviewed 18 October 2026
Everyone gets a GST return wrong at some point. A box was keyed in the wrong place, an invoice was missed, or a claim shouldn’t have been made. IRAS has two ways to put it right: through your next F5, or through the GST F7. Which one you use depends on how big the error is.
At a glance
| Question | Short answer |
|---|---|
| What is the F7? | IRAS’s form for correcting errors in a previously submitted F5, F7 or F8 return |
| Do I always need it? | No. A small error can be corrected in your next F5 |
| The test for the next F5 | Net GST error across the affected periods of no more than S$3,000, and non-GST errors of no more than 5% of the total supplies declared in Box 4 |
| Time limit | Correct errors within five years of the period end |
| What does it do? | It replaces the earlier return for that period, so you fill in all the boxes again |
| Several periods? | Errors across several periods in one year can be put in one F7 |
F7 or next F5?
You can correct a small error in your next F5 if both of these hold:
- the net GST error across the affected periods is no more than S$3,000, and
- any non-GST errors are no more than 5% of the total supplies declared in Box 4.
If either test fails, file a GST F7 for the affected periods.
What the F7 does
The F7 replaces the earlier return for the period, so every box has to be filled in, not only the ones you are changing. If errors affect several periods in the same year, you can combine them in one F7.
Penalties and disclosure
An error is not the same as an offence, but an incorrect return can carry penalties. IRAS’s Voluntary Disclosure Programme says that if you disclose an error on your own initiative, before IRAS queries you or starts an audit, no penalty applies when the disclosure is made within one year of the statutory filing deadline. After that, the penalty is a flat 5% of the tax undercharged. See our page on GST audit preparation for how we review returns before IRAS does.
Example (illustration only). ABC Pte Ltd finds that, across two quarters, it claimed S$4,500 of input tax it shouldn’t have, on a blocked item and on invoices addressed to a director. The net GST error is S$4,500, above S$3,000, so ABC files a GST F7 for the two periods. DEF Pte Ltd finds a S$800 error in one quarter, with no other mistakes. That is within S$3,000, so DEF corrects it in its next F5.
What helps
- Keep the working showing how the error arose and how you calculated the correction.
- Correct as soon as you find it. Waiting rarely helps.
- Check the cause. If the same error repeats across periods, it is usually a tax code or a process problem in your books, not a one-off.
- Read the conditions for claiming GST input tax if the error was an input tax claim.
Questions we get asked
Can I correct an error in the next return? Yes, if you meet both tests above.
Can I correct an F8? The F7 can correct a previously submitted F8, as well as an F5 or another F7.
How far back can I go? IRAS says to correct errors within five years of the period end.
Is the F7 a voluntary disclosure form? The IRAS e-Tax Guide does not describe it that way. The Voluntary Disclosure Programme has its own conditions, so check which route applies.
Get a GST return reviewed
Send us the return and the books behind it. We’ll tell you whether the next F5 is enough or whether an F7 is needed, and what it will cost in penalties. Get a GST return reviewed. Related: GST compliance filing and our GST services overview.
Sources
- IRAS, How do I prepare my GST return? (e-Tax Guide), Eleventh Edition (paragraphs 4.2.7, 4.2.11, 4.2.13)
- IRAS, Correcting errors made in GST return (filing GST F7) (page body would not load; thresholds as in the GST services hub)
- IRAS, IRAS’ Voluntary Disclosure Programme e-Tax Guide (Thirteenth Edition, 30 January 2026)
This page is general information as at the date above, not legal, regulatory or professional advice. Rules change, so please take advice on your own circumstances before acting.