Most Singapore businesses assume the supplier always issues the tax invoice. In a handful of industries, that assumption is wrong by design. Under a self-billing arrangement approved by the Inland Revenue Authority of Singapore (IRAS), it is the GST-registered customer, not the supplier, who prepares the tax invoice and hands a copy to the supplier for their records.

This sounds like a paperwork curiosity until you are the finance manager of a publishing house, a scrap metal buyer, or a logistics company that only knows the final billable value of a shipment after it has been weighed, graded, or reconciled at your own end. In those situations, waiting for the supplier to issue an invoice based on figures you will dispute anyway wastes time on both sides. Self-billing lets the party with the accurate final figures issue the invoice, provided IRAS’s conditions are met.

This article sets out when self-billing is permitted, the conditions a customer must satisfy before adopting it, what a self-billed tax invoice must contain, and the practical risks a company secretary or finance team should flag before signing a self-billing agreement.

What self-billing is and why it exists

Self-billing is a billing arrangement between a GST-registered supplier and a GST-registered customer in which the customer prepares the supplier’s tax invoice (sometimes called a buyer-created tax invoice) instead of the supplier doing so. The customer then sends a copy to the supplier, who uses it to account for output tax in the normal way.

IRAS permits this only in circumstances where the customer, rather than the supplier, is best placed to determine and verify the final value of what was supplied. The classic examples are industries where goods are graded, weighed, tested, or otherwise valued only after delivery: scrap and recycled materials, agricultural produce, certain publishing and royalty arrangements, and some logistics and freight settlements. In each case, the supplier genuinely does not know the exact billable amount until the customer’s own process confirms it.

Self-billing is not a general convenience for administratively lazy customers. IRAS expects it to be used only where there is a real commercial reason the supplier cannot reliably invoice first.

Conditions before a customer can adopt self-billing

A customer that wants to self-bill cannot simply start doing so. IRAS requires the customer to complete a self-review of eligibility, using IRAS’s declaration form, confirming that all of the following broadly hold:

  • Both the supplier and the customer are GST-registered at the time of supply.
  • There is a genuine commercial reason the customer, not the supplier, is best placed to determine the value of the supply (for example, the goods are only measured, tested, or graded after receipt).
  • There is a prior written agreement between the supplier and the customer setting out the self-billing arrangement, including that the supplier agrees not to issue its own tax invoices for supplies covered by the arrangement.
  • The customer undertakes to correctly account for GST, issue self-billed invoices within the required time frame, and keep proper records.

Under the current framework, a customer that has verified these conditions can generally adopt self-billing from the date it submits its self-review declaration form on the IRAS website, without waiting for separate written approval from IRAS for each arrangement. That said, the declaration is not a formality. If the written agreement is missing, or the conditions turn out not to have been satisfied, the self-billed documents have no standing as valid tax invoices and any input tax claimed against them is at risk on audit.

This is one of the more common findings in a GST review: a self-billing relationship exists informally, invoices have been issued this way for years, but nobody can produce the underlying written agreement or the eligibility declaration. Company secretaries and finance staff supporting a client through incorporation or a GST registration review should ask early whether any self-billing arrangements exist and whether the paperwork behind them still holds up.

What a self-billed tax invoice must contain

A self-billed invoice must carry all the same mandatory fields as an ordinary GST tax invoice set out in IRAS’s guidance on invoicing customers, plus a few markers specific to the arrangement. In practice this means the document should show:

  • The words “Self-Billed Invoice” (or an equivalent statement making clear it is issued under a self-billing arrangement) prominently displayed.
  • The name, address and GST registration number of both the supplier and the customer.
  • A description of the goods or services supplied, the quantity, and the value.
  • The GST rate applied and the total GST amount charged.
  • The total amount payable, inclusive of GST.
  • An invoice date, generally issued within the usual time of supply rules that apply to ordinary tax invoices.

Since Singapore’s GST InvoiceNow roll-out, businesses within scope should also be transmitting self-billed documents through the InvoiceNow network in the prescribed PINT-SG format, rather than relying purely on PDF invoices emailed between parties. A self-billing arrangement does not exempt either party from the InvoiceNow obligations that otherwise apply to their turnover and registration profile.

Who carries the risk if something goes wrong

Because the customer prepares the invoice, the customer carries most of the compliance burden, but the supplier is not off the hook. The supplier remains the party legally accountable for the output tax shown on the self-billed invoice, even though someone else calculated it. If the customer under-declares the value of a supply, or issues a self-billed invoice for a transaction that falls outside the agreed arrangement, the supplier can still be assessed for the shortfall.

This is why the written agreement matters so much in practice. A properly drafted self-billing agreement should specify exactly which categories of supply the arrangement covers, how disputes over valuation are resolved, how errors are corrected, how long records must be kept (both parties should retain self-billed invoices for the standard record-keeping period), and what happens if either party’s GST registration is cancelled. A company that lets self-billing run on an informal handshake basis is exposing itself to exactly the kind of finding that surfaces during a GST audit or an IRAS Assisted Self-Help Kit review.

Directors weighing up broader commercial arrangements, from supplier contracts to how a company structures its working capital, are usually also thinking about wider investment decisions for the business as a whole. Getting the invoicing mechanics right is a small but real part of keeping that bigger picture clean.

Self-billing versus reverse charge and customer accounting

Self-billing is often confused with two other arrangements that also shift some GST responsibility onto the customer, but they are legally distinct.

Under the reverse charge regime for imported services and low-value goods, a customer that is not entitled to full input tax recovery must self-account for GST on qualifying imported services or goods as if it were the supplier. This is a statutory obligation triggered by import status and recovery rate, not a voluntary billing convenience.

Under customer accounting for prescribed goods (which applies to items like mobile phones, memory cards and processing chips above certain values in business-to-business transactions), the customer accounts for the output tax on the supply instead of the supplier, again as a statutory anti-fraud measure.

Self-billing, by contrast, does not shift who is legally liable for output tax. The supplier is still the accountable party. What changes is only who physically prepares the document. Businesses sometimes assume that because they self-bill for one supplier relationship, they can treat all their supplier relationships the same way, or that self-billing exempts them from reverse charge obligations elsewhere in the business. It does not. Each regime has to be assessed on its own conditions.

Practical steps for a business considering self-billing

A business that thinks self-billing genuinely fits its commercial reality should work through a short checklist before adopting it:

  • Confirm both parties are GST-registered and will remain so for the duration of the arrangement.
  • Document the genuine commercial reason the customer is better placed to value the supply than the supplier.
  • Draft and sign a written self-billing agreement covering scope, dispute resolution, error correction, record retention and termination.
  • Complete IRAS’s self-review declaration and keep it on file alongside the agreement.
  • Build the mandatory invoice fields, including the “Self-Billed Invoice” marker, into the template used.
  • Check whether InvoiceNow transmission requirements apply to either party and route the documents accordingly.
  • Review the arrangement periodically, particularly if either party’s GST registration status, turnover, or business model changes.

For groups that also run GST registration and filing reviews as part of annual compliance, self-billing arrangements are worth adding to the checklist alongside more familiar items like reverse charge and overseas vendor registration exposure.

Where this fits into wider GST housekeeping

Self-billing rarely sits in isolation. Businesses that use it tend to also be dealing with more conventional GST mechanics: registration thresholds, bad debt relief on unpaid invoices, and the broader question of whether their coding and documentation would survive an IRAS review. A company that has not looked closely at its bookkeeping practices in a while is unlikely to have a clean self-billing paper trail either, since both problems usually stem from the same root cause: nobody owns the compliance calendar.

If your business is considering a self-billing arrangement, or if you suspect one has been running informally without the underlying agreement and declaration in place, it is worth having your corporate secretarial and accounting advisers review the position before your next GST filing, rather than waiting for IRAS to raise it first.

Conclusion

Self-billing is a narrow but useful mechanism for the specific commercial situations where the customer, not the supplier, holds the information needed to value a supply accurately. It is not a shortcut around ordinary invoicing discipline. The customer must complete IRAS’s eligibility declaration, both parties need a proper written agreement, the resulting invoices must carry the correct fields, and the supplier remains legally on the hook for the output tax even though it did not prepare the document. Get the paperwork right at the outset and self-billing runs quietly in the background. Get it wrong, and it becomes a live finding the next time IRAS or your own auditors look closely at your GST position.

To speak with the team at Raffles Corporate Services, you can email [email protected] or call, SMS, or WhatsApp +65 8501 7133. We are happy to assist with any queries.

The Editorial Team, Raffles Corporate Services