SMS marketing for a Singapore small business starts at the Sender ID Registry, not at a platform

Before a Singapore business sends its first marketing text, there is a registration to pay for, and it is not on any platform's price list. Read on smsregistry.sg on 26 October 2026, the SMS Sender ID Registry charges a one time set up fee of S$545 with GST for each registered organisation, S$218 with GST for each registered whitelist Sender ID, and S$54.50 with GST for each registered blacklist Sender ID per billing year. The registry is operated by the Singapore Network Information Centre, which also runs the .sg domain registry.

That is the real starting price of the channel here, and it comes before the per message rate, the platform fee and the consent tooling. A Singapore business choosing an SMS vendor on monthly cost alone has compared the smaller number. The bigger decision is whether the vendor can even carry a registered Sender ID, because under the rules in force since 31 January 2023 an unregistered one does not arrive looking like your brand.

What happens to an unregistered sender

SGNIC's own FAQ for the registry, read on 26 October 2026, states that from 31 January 2023, when the Full SSIR Regime took effect, all non registered Sender IDs are marked "Likely-SCAM". Not blocked, not queued, labelled. Your appointment reminder reaches the customer's phone with a scam warning printed above it.

That is the Singapore specific reason this channel cannot be bought casually. In most markets an unregistered sender gets filtered quietly or delivered from a random long number. Here it is delivered with a label that tells your own customer not to trust you, and the fix is a registration you pay for in Singapore dollars rather than a setting inside a dashboard.

The two kinds of Sender ID, and why you want both

• Whitelist IDs are the names you intend to send from. SGNIC states that whitelist IDs registered with it are sent onward by mobile network operators and SMS aggregators for delivery. These are the S$218 line, with GST, each.
• Blacklist IDs are the names you do not use and do not want anybody else using. SGNIC states that blacklist IDs registered with it are blocked by operators and aggregators. The FAQ gives the reason in plain terms: if you register XYZ as a whitelist ID, the variants a scammer can reach for include XYZ SG, XYZ Info, XYZ Service and XYZco. At S$54.50 with GST per billing year each, blacklisting the obvious variants of your own brand is the cheapest brand protection on this list.

The aggregator rule that eliminates most of your vendor shortlist

This is the part that decides which platform you can buy, and it is the part nobody checks first. SGNIC's FAQ states that Participating Aggregators are SMS aggregators licensed by the Infocomm Media Development Authority to deliver messages carrying Sender IDs registered with SGNIC, and that only Participating Aggregators can handle registered Sender IDs. If your chosen aggregator is not on that list, the FAQ says SGNIC can work with you to onboard them, and that otherwise you may have to reroute your traffic through other Participating Aggregators for the whitelist protection to work correctly.

So the first question to a prospective SMS vendor in Singapore is not about features. It is: which Participating Aggregator do you route Singapore traffic through, and is the Sender ID registered to my organisation or to yours. SGNIC publishes the list of Participating Aggregators on its own site, and the registry account set up asks you to select the aggregators your organisation works with, which means the answer is a fact rather than an opinion.

Who owns the registration when an agency sets it up

Registration runs through the SSIR Portal with Corppass verification, so the account is tied to your company's own government login and your UEN, not to a vendor's. That is the right outcome and it is worth protecting. A foreign business registers through a Singapore subsidiary or branch office with a valid UEN, and SGNIC's FAQ describes a Letter of Authorisation that the local entity issues to authorise overseas branch offices to send using its registered Sender IDs, with the completed letter submitted to the participating aggregators engaged. If your agency or regional head office is sending on your behalf, that letter is the mechanism, not a shared password.

The checklist a platform has to pass on consent capture, consent export and opt out handling sits in our page on how to compare SMS marketing companies on the consent stack, and one row there asks who owns the sender registration. In Singapore this is the concrete answer to that row.

Two payment details that catch Singapore buyers out

• The clock starts at acceptance, not at the invoice. SGNIC states that the payment deadline shown in the SSIR Portal for a new account set up or Sender ID fee is 30 calendar days from the date of acceptance, not the date on the proforma invoice. A finance team working from the invoice date can be a week late without knowing it.
• The registry does not email you a payment link. SGNIC states plainly that its emails contain no payment link, that payment for the account set up fee and the annual Sender ID listing fee is processed through the portal, and that you should verify you are on the official portal address before entering credentials or payment details. A message that arrives claiming to be the registry and carrying a link to pay is the thing this registry exists to stop.

Costing the channel honestly for a small Singapore business

Put the registration beside the platform rather than behind it. A one brand business registering one whitelist ID and three defensive blacklist variants is looking at S$545 with GST once, S$218 with GST for the whitelist ID, and S$54.50 with GST for each blacklist ID per billing year. That is the floor before a single message is sent, and it is a fixed cost rather than a volume cost, which has two consequences.

• Low volume senders should think twice. If the plan is a dozen messages a month, the fixed registration is the dominant cost and email or a messaging app may do the job for nothing. SMS earns its registration when it carries something time critical to people who already gave you their number.
• High volume senders should register more names, not fewer. Once the organisation fee is paid, each extra whitelist ID is incremental, so a business running genuinely separate brands or a separate transactional sender can register each one properly rather than squeezing everything through a single name.

The consent side is law rather than price. Marketing calls and texts to Singapore numbers fall under the Do Not Call provisions of the Personal Data Protection Act 2012, and our page on the cheapest monthly marketing spend a Singapore business can defend gives the commencement dates and the section that carries the duty to check the register. Nothing here is legal advice, and a question about your own list belongs with a Singapore lawyer.

The vendor conversation, in order

• Which Participating Aggregator carries your Singapore traffic, named, so it can be checked against SGNIC's published list.
• Whether the Sender ID will be registered to our UEN through our own Corppass, and confirmation in writing that it will not sit under the vendor's organisation.
• Which blacklist variants of our brand you recommend registering, and whether you will prepare the list.
• What happens to delivery on the day a registration lapses, and who watches the renewal date.
• How transactional and marketing messages are kept on separate flows, so a promotion problem never takes an order confirmation with it.
• Only then: the per segment rate, the inbound rate and the platform fee.

Questions Singapore businesses ask about SMS marketing costs

Do I have to register a Sender ID to send SMS in Singapore

You can send without one, and SGNIC states that since 31 January 2023 all non registered Sender IDs are marked "Likely-SCAM". For a business sending to its own customers, that label is the whole problem, so treat registration as part of the cost of the channel.

What does the SMS Sender ID Registry cost

Three charges, read on smsregistry.sg on 26 October 2026. The organisation pays S$545 with GST once to join. Each Sender ID you want to protect costs S$218 with GST. Each one you want blocked from use runs S$54.50 with GST, and that one recurs every billing year. Check the figures on the registry's own site on the day you budget, since fee schedules move.

Can my SMS platform register the Sender ID for me

Registration is done through the SSIR Portal with Corppass verification, which ties the account to your own company. Your aggregator has to be a Participating Aggregator for a registered ID to be carried, so the platform is involved in delivery. Keep the registration in your own organisation's name.

What if my preferred vendor is not a Participating Aggregator

SGNIC says only Participating Aggregators can handle registered Sender IDs, that it can work with you to onboard an aggregator, and that otherwise you may need to reroute traffic through other Participating Aggregators. Ask the vendor this before signing, because changing aggregator after launch is a migration.

Is SMS worth it for a small business here

It is strongest for time critical messages to people who already gave you their number: an appointment, a delivery window, a service due date. Because the registration is a fixed cost, the channel pays back on frequency rather than on list size, so it suits a business that texts the same customers regularly more than one that texts occasionally.

Should I register blacklist Sender IDs as well

At S$54.50 with GST per billing year each, registering the obvious variants of your own brand name blocks them from being used to impersonate you. SGNIC gives the variant pattern itself, with examples built from a brand name plus SG, Info, Service and co.

One more place your brand name appears, with no registry behind it

The reason Singapore built this registry is simple and it is worth stating plainly: a brand name at the top of a message is a claim about who is speaking, and claims about identity need a register behind them or they get abused. Pay the fee and the name on your text is provably yours. Your brand name now appears in a second place where no register exists. When a buyer here asks an assistant who to use, the reply names a few companies and sometimes characterises them, in a sentence nobody at any of those companies wrote and nobody can amend. There is no whitelist, no blacklist and no annual fee. The only instrument available is the same one that works on the registry: look at what is actually there. Ask the buying questions for your category with your own name left out, and note which companies are named and how they are described. AI Knows Us runs exactly that, keeps each reply with the date it was given, and shows which sources it was built from.