Every GST-registered business in Singapore files a GST F5 return every quarter, declaring output tax collected and input tax claimed for the period, with the net amount due to (or refundable from) IRAS. The filing itself is a form. What actually matters is whether the numbers on that form genuinely match what happened in your business that quarter because the gap between the two is where most GST problems quietly start.
Here’s a pattern worth knowing: businesses rarely get audited because of one dramatic mistake. They get flagged because their quarterly returns, viewed over a year or two, don’t reconcile cleanly against their own accounts. A single mismatched quarter might not raise anything. A pattern of them does.
What we actually do each quarter
We don’t just total up your sales and purchases and submit a number. We reconcile the GST F5 figures against your actual bookkeeping records before filing checking that zero-rated sales have the supporting documentation to justify the treatment, that input tax claims are backed by valid tax invoices, and that nothing’s been double-counted or missed between periods. Then we file through the myTax Portal by the deadline, one month after each accounting period closes.
The quarter that catches people out
The quarter where a large one-off transaction happens, a big export shipment, an unusual asset sale, a significant overseas service purchase is the one most likely to have a GST treatment question attached to it. Routine monthly transactions tend to follow an established pattern that’s easy to get right consistently. The unusual ones are where a wrong call slips through if nobody’s specifically checking.
What happens when the numbers don’t reconcile cleanly
Sometimes they genuinely won’t, especially if bookkeeping and GST filing have historically been handled by different people without much communication between them. When we find a discrepancy, we trace it back to its source rather than smoothing it over with a plug number that makes the return balance, a convenient-looking figure that doesn’t reflect what actually happened is exactly the kind of thing that surfaces badly later, during a review.
Late filing and why it compounds
GST F5 returns filed late attract penalties that increase the longer the delay continues, and persistent late filing is itself a pattern IRAS notices. We build GST filing into the same calendar as your bookkeeping cycle specifically so it isn’t a separate deadline someone has to remember on top of everything else.
Who this is for
GST-registered businesses who want their quarterly filing handled as part of an integrated process with their bookkeeping, not as a disconnected task someone scrambles to complete every three months from a spreadsheet that doesn’t quite match the accounts.