Any business whose taxable turnover exceeds SGD 1 million in any twelve-month period must register for GST with IRAS — and from registration day, every standard-rated supply must carry GST at 9 % and be transmitted through InvoiceNow. Zero-rating applies to exported goods and qualifying international services, while residential property and most financial services remain exempt.
Invoices issued before registration is finalised lack the correct GST treatment, creating a gap in the InvoiceNow audit trail that IRAS may query during a review.
9 % / 0 % / exempt GST logic applied automatically per supply type, with a clean Peppol record timestamped from the first day of registration.
Input and output GST are manually reconciled each quarter from invoices and purchase records, taking hours and introducing transcription errors before each F5 filing.
Live input/output GST ledger updated with every transaction, producing a one-click export structured to match the IRAS GST F5 return fields.
Mandatory registration applies when taxable turnover exceeds SGD 1 million in the past 12 months or is expected to exceed this in the next 12 months. Voluntary registration is also permitted before the threshold is reached.
Correct rates, live ledger, clean IRAS F5 basis — activated before the first post-registration invoice.
