Accurate quarterly GST returns, registration support, and e-invoicing readiness — so a GST-registered business stays clean with IRAS and never scrambles at the filing deadline.
GST is one of those obligations that looks simple from the outside and turns out to have a lot of edges. Once a business is registered, every sale and purchase carries a tax treatment, every quarter brings a return, and every figure in that return has to reconcile back to the books. When the coding drifts during the period, the filing becomes a guessing exercise — and GST is precisely the area IRAS examines most closely.
Our GST filing service keeps that whole cycle in order. We check whether and when you need to register, set up correct GST coding in your accounting system, prepare and submit each quarterly GST F5 return on time, and keep you ready for the move to InvoiceNow e-invoicing. The standard GST rate in Singapore is 9%, and the work is in applying it correctly across every transaction, not just on the headline number.
This service suits a range of situations where GST is becoming real work rather than an afterthought:
GST errors are seldom dramatic. They build up quietly through the period and only surface when a return is being prepared or when IRAS reviews it. The recurring ones we see and fix:
Clean, consistent coding during the quarter is what makes the return at the end of it accurate. We keep that discipline so the filing is a confirmation, not a reconstruction.
Onboarding is light. To take on your GST filing we typically need:
Where you are already on Xero, we work directly in your file rather than moving your books onto a closed system.
The engagement is built to be predictable. The steps are straightforward:
GST filing also sits naturally inside a broader accounting and tax engagement, which includes GST alongside your monthly books and annual corporate tax — useful if you would rather have one team handle the whole compliance calendar.
Registration becomes compulsory under two tests. Looking back: if your taxable turnover for a calendar year exceeds S$1 million, you must apply to IRAS by 30 January of the following year and you are registered from 1 March. Looking forward: if at any point you can reasonably expect taxable turnover to exceed S$1 million in the next 12 months, you must apply within 30 days of that forecast. We monitor your rolling turnover so you register on time and avoid late-registration penalties and back-dated liability.
You can register voluntarily before reaching the S$1 million threshold. It can make sense when most of your customers are themselves GST-registered, or when you incur significant GST on purchases that you would like to claim back as input tax. The trade-off is that you take on quarterly filing obligations, must stay registered for at least two years, and, since 1 April 2026, must adopt an InvoiceNow-ready solution to transmit invoice data to IRAS as a condition of voluntary registration. We help you weigh the cash-flow and administrative impact before you decide.
Most GST-registered businesses file the GST F5 return quarterly, covering a three-month accounting period, with the return and any net GST due to IRAS within one month after the end of the accounting period. Some businesses are placed on a monthly cycle. We prepare and submit each return on schedule and reconcile it back to your accounts so the numbers tie out.
Frequent errors include claiming input tax on blocked or non-business expenses, applying the wrong GST treatment to overseas or zero-rated supplies, charging GST before the registration date, and mismatches between the return and the underlying accounting records. These are exactly the items IRAS looks at on review. Clean, consistent GST coding through the period prevents most of them.
InvoiceNow is Singapore's national e-invoicing network, based on the Peppol framework and overseen by IMDA, and IRAS is phasing in a requirement for GST-registered businesses to transmit invoice data through it: new voluntary registrants have been in scope since 1 April 2026, and existing GST-registered businesses follow in phases from 1 April 2028 to 1 April 2031, depending on annual turnover. We help you understand whether and when it applies to you and get your invoicing set up so the transition is smooth.
Yes. We prepare and submit your GST registration with IRAS, advise on the effective date, set up correct GST coding in your accounting system, and take over the recurring quarterly returns from there. If you are already registered, we can review your existing setup and pick up the filings going forward.
Steadbook Advisory LLP has been registered in Singapore since 2018. Both co-founders trained in audit at Ernst & Young, and the firm is led by an ASEAN Chartered Professional Accountant. A named lead runs your file day to day, with partner review before anything is filed.
Tell us about your company and we'll reply with questions and a written proposal, usually within five working days. See how we price first if you'd like.
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