Customs Valuation Singapore: What Your Invoice Leaves Out

Duty and GST are not calculated on your invoice total. They are calculated on the customs value, which Singapore Customs builds from the price you paid plus commissions, packing, royalties, freight and insurance. Getting that number wrong understates your tax, and the shortfall surfaces later, after you have already priced the job.

Most first-time importers assume the two figures are the same. The invoice says S$20,000, so the tax gets budgeted on S$20,000. Then the declaring agent files the permit, the tax lands on a bigger number, and nobody in the room can explain the difference. It is not a hidden fee. It is the customs value, and the rules for building it are published.

Key Takeaways

• The customs value is the figure used to calculate customs duty, excise duty on goods with ad valorem rates, and GST (Singapore Customs, last updated 12 February 2026).

• The primary method is the transaction value method. It is based on the CIF value, and must include all charges incidental to the sale and delivery of the goods to Singapore (Singapore Customs).

• Singapore Customs names the charges to include: selling commissions, assists, packing costs, proceeds of resale accruing to the seller, royalties and licence fees, freight and insurance (Singapore Customs).

• GST is calculated on the customs value plus all duties, or on the last selling price plus all duties where the goods were sold more than once before import and the last buyer declares the payment permit (Singapore Customs, last updated 24 February 2026).

• The prevailing GST rate is 9% (IRAS). IRAS also publishes the history: 7% to 31 December 2022, then 8% for 2023.

• Where a price is quoted FOB and the actual freight and insurance are not known, Singapore Customs publishes flat rates by place of export, ranging from 5% of FOB value for Peninsular Malaysia to 24.5% for Africa, Canada and USA (Singapore Customs, last updated 25 March 2026).

• Where the transaction value method cannot be used, the published fallbacks are identical or similar goods value, deductive value, computed value, then residual valuation (Singapore Customs).

• An importer who needs certainty before shipping can apply for a Customs ruling on valuation. The fee is S$165 inclusive of GST per application (Singapore Customs, last updated 18 August 2026).

What is a customs value, and why isn't it your invoice total?

A customs value is the single figure a customs authority uses as the base for calculating tax on an import. It is not a fee, and it is not an officer's opinion. It is a calculated number with published rules behind it.

Singapore Customs states that the customs value is used to calculate customs duty, excise duty for goods with ad valorem rates, and Goods and Services Tax (Singapore Customs).

Ad valorem means a duty charged as a percentage of value rather than as a fixed sum per unit. That is exactly why the value carries so much weight. On an ad valorem rate, every dollar added to the value is another dollar the percentage runs across.

Why does the rule exist at all? Because if the tax base were simply whatever the invoice said, it would be set by the two parties to the sale, and neither of them pays it. The WTO describes its customs valuation agreement as aiming for a fair, uniform and neutral system that conforms to commercial realities, and one that outlaws the use of arbitrary or fictitious customs values (WTO). Singapore's rules sit inside that framework.

The consequence of getting it wrong is rarely dramatic on day one. It is that your cost model runs short by a consistent margin on every shipment, and you find out at the worst possible moment, after you have quoted your own customer. Our guide to landed cost calculation covers the whole arrival cost. This article is about the one number underneath it.

Which costs get added to the price you actually paid?

Singapore Customs states that the transaction value method is the primary method, that it is based on the Cost, Insurance and Freight value under Incoterms, and that to calculate the customs value you must include all charges incidental to the sale and delivery of the goods to Singapore (Singapore Customs).

CIF means Cost, Insurance and Freight: the goods themselves, the insurance covering them in transit, and the cost of moving them here. If the Incoterm language is new to you, our Incoterms 2020 guide sets out who carries which cost under each term.

Singapore Customs names the charges that go into the value:

• selling commissions

• assists, which it describes as materials provided by the importer

• packing costs

• proceeds of resale accruing to the seller

• royalties and licence fees

• freight charges

• insurance charges

Two of those catch people out often enough to be worth defining properly.

An assist is something you gave your supplier free or cheaply that went into making your goods: a mould, a tool, a component you shipped them, a design you paid a third party for. You paid for it once, separately, so it never appears on the supplier's invoice. It still forms part of what the goods are worth.

A royalty or licence fee is what you pay for the right to use a brand, a patent or a design embodied in the goods. Again, it usually sits in a separate agreement with a separate payment, and again it belongs in the value.

The pattern is consistent once you see it. The customs value follows the economics of getting those goods here, not the layout of one document. If you paid it, and it relates to these goods arriving in Singapore, it probably belongs in the number. Where you cannot tell, put the question to Singapore Customs or your declaring agent against your actual contract, rather than settling it by analogy with someone else's shipment.

What does the arithmetic look like on a real consignment?

Singapore Customs publishes its own worked example, which is the most reliable way to watch the mechanism run.

In that example a company imports two cartons of vitamins on Ex Works terms. Ex Works, or EXW, means the seller simply makes the goods available at their own premises, and the buyer takes on everything after that: collection, export clearance, international transport and insurance (Singapore Customs). Because the buyer carries all those costs, none of them sit inside the seller's price, and every one of them has to be added back.

Singapore Customs sets the build-up out as follows (Singapore Customs, last updated 12 February 2026).

Cost component	Amount	Inside the customs value?
Vitamins (the goods)	S$1,000	Yes
Selling commission	S$100	Yes
Inland transport to port of export	S$150	Yes
Handling and documentation at port of export	S$200	Yes
Overseas freight	S$300	Yes
Insurance	S$50	Yes
Customs value	S$1,800	This is the figure tax is charged on

Now read what that does. The goods invoice said S$1,000. The customs value is S$1,800. Everything in between came from costs that were never printed on the invoice for the goods.

Work the tax across it. The S$1,800 customs value is Singapore Customs' published figure and the 9% rate is IRAS's (IRAS); the multiplication below is ours, shown so you can follow the method rather than trust a number. Nine per cent of S$1,800 is S$162. An importer who budgeted 9% of the S$1,000 invoice would have set aside S$90. The cartons are identical either way. The gap is S$72 on one small shipment, and it repeats on every shipment priced the same way.

Singapore Customs' second published example makes the same point at personal scale: a bag costing S$400, handling charges of S$20, overseas freight of S$30 and no insurance purchased, giving a customs value of S$450 (Singapore Customs). A S$400 purchase is not a S$400 import, which matters a great deal if you were relying on a value threshold. We work through those thresholds in our guide to GST on parcels into Singapore.

When will Singapore Customs decline to use your invoice price?

The transaction value method is the primary method, not an automatic one. Singapore Customs states it will use the method only if all of the following conditions are met (Singapore Customs).

• There must be evidence of a sale. Singapore Customs gives a commercial invoice, a sales contract and a purchase order as examples of valid documents.

• There must be no restriction on the buyer's use of the goods.

• The sale must not be subject to conditions that may distort the value. Singapore Customs offers two examples: the seller setting the price on condition that the buyer also buys other goods, and the price of semi-finished goods being set on condition that the buyer supplies a portion of the finished goods back to the seller.

• The relationship between the importer and the supplier must not influence the transaction value.

Each condition is doing visible work once you ask what it protects against. The first rules out shipments with no sale behind them: free samples, goods on consignment, warranty replacements, stock moved between your own branches. No price paid means no transaction value to use. Those consignments still have a customs value; it simply has to be reached another way. That is the part people miss when they write nil on a sample shipment.

The fourth condition is the one that catches groups. If you import from your own parent or a sister company overseas, you are related parties, and the price between you was set inside the group rather than by a market. Singapore Customs describes transfer pricing as how prices are determined for transactions between related parties, and states those prices must follow the arm's length principle, reflecting the price independent parties would have agreed under similar conditions (Singapore Customs, last updated 31 March 2026).

That does not mean an intra-group price gets rejected. It means the relationship must not have influenced it, and you should expect to be able to show that. Singapore Customs points traders to the IRAS e-Tax Guide for transfer pricing adjustments on non-dutiable goods and for GST treatment (Singapore Customs). If your imports run inside a group structure, that is a conversation to have with a tax adviser before a permit is filed rather than after a query arrives.

What happens when the transaction value method cannot be used?

There is a published order of fallbacks, and it is worth knowing before you need it. Singapore Customs states that where the transaction value method cannot be used, the following alternatives determine the customs value (Singapore Customs).

Method	What the value is based on
Identical or similar goods value	The transaction value of identical or similar goods sold for export to Singapore
Deductive value	The selling price of the goods in Singapore, adjusted for costs incurred after importation
Computed value	Production cost, general expenses, and profit in the country of origin of the imported goods
Residual valuation	The principles behind the other methods, applied flexibly

Read the logic downward. The first fallback still uses real prices from real transactions, just somebody else's. The second works backwards from what the goods fetch here. The third builds up from what they cost to make. The fourth is the flexible last resort.

The further down that list you travel, the less the answer comes from your own paperwork. That is the practical argument for keeping the transaction value method available: it is the only method where your documents drive the outcome. A commercial invoice, a purchase order and a contract that agree with one another are not administrative housekeeping. They are what keeps the valuation on the method you can evidence. When documents disagree, cargo tends to stop, and we set out the usual causes in our guide to cargo held at Singapore Customs.

Your invoice is in another currency. Which exchange rate applies?

Not the rate your bank gave you, and not the rate on the day you placed the order.

Singapore Customs states that if any cost is in a foreign currency, you convert it to Singapore dollars using the prevailing weekly average exchange rates published by the Monetary Authority of Singapore, at the time the customs duty or excise duty is paid (Singapore Customs). Singapore Customs publishes the applicable rates (Singapore Customs).

Two details in that sentence matter. The rate is a published weekly average rather than a live spot rate, so it will rarely match your bank statement. And the timing is anchored to when duty is paid, not to when you bought, shipped or invoiced. Your tax base therefore moves with a rate you neither control nor can lock. On one shipment the effect is small; across a year of regular imports it is large enough to model rather than ignore.

You bought FOB and nobody told you the freight cost. Now what?

This is a common and slightly embarrassing position to be in, and there is a published answer for it rather than a guess.

FOB means Free On Board. The seller delivers the goods to the port of export, loads them onto the vessel and clears them for export; from the moment they are loaded, the buyer pays for international freight and insurance and carries the risk (Singapore Customs). So an FOB price excludes, by definition, the freight and insurance that the customs value has to include.

Singapore Customs states that where the transaction value is quoted in FOB terms and the actual freight and insurance charges are not known or not available to the importer, you may apply its published flat rates, expressed as a percentage of the FOB value and set by the place of export (Singapore Customs, last updated 25 March 2026).

Place of export	Flat rate (% of FOB value)
Africa, Canada and USA	24.5%
Europe	19%
Japan, Australia and New Zealand	19%
China, Chinese Taipei, Korea, Sri Lanka, India and Pakistan	15.5%
Myanmar, Thailand, Cambodia, Laos, Vietnam, Hong Kong, Philippines and Indonesia	9.5%
Peninsular Malaysia	5%

The shape of that table deserves a moment. The rates track distance, and the spread is wide. An FOB price out of Peninsular Malaysia carries a 5% uplift; the same FOB price out of the USA carries 24.5%. If you are comparing two suppliers on FOB prices alone, and one sits across the Causeway while the other sits across the Pacific, those FOB numbers are not comparable, because it is the customs value and not the FOB price that your GST runs on. Our guide to shipping from Malaysia to Singapore covers that lane, and our method for comparing forwarder quotes covers the same trap on the freight side.

There is a separate flat rate for insurance on its own. Singapore Customs states you may use a flat rate of 1% for insurance where the transaction value is quoted CFR, meaning Cost and Freight, and the actual insurance cost is not known or available (Singapore Customs). Where no insurance was bought at all, Singapore Customs states traders may set the insurance cost to zero when calculating the customs value (Singapore Customs).

That last point is worth reading twice, because it is easy to take the wrong lesson from it. Uninsured cargo produces a lower customs value. It also produces an uninsured cargo. Those are two different decisions, and our marine cargo insurance guide explains why carrier liability is rarely a substitute for cover.

Why can a resale before arrival raise the tax on the same goods?

This is the rule that surprises traders and middlemen most, and it is published plainly.

Singapore Customs states that GST on imported goods is calculated on the customs value plus all duties, or on the last selling price plus all duties where the goods were sold more than once before importation and the last buyer is the party declaring the payment permit (Singapore Customs, last updated 24 February 2026).

Its published example shows the effect cleanly. Company A buys 100 boxes of vitamins for S$900 on FOB terms, with overseas freight, handling and insurance of S$100. Company A then sells the vitamins to Company B for S$1,500 before they arrive in Singapore. Because Company B is the final buyer before importation, GST is payable on S$1,500 rather than on the S$1,000 build-up (Singapore Customs).

Follow what actually happened there. The goods never changed. The freight never changed. A resale took place while the cargo was on the water, and the tax base moved from S$1,000 to S$1,500, because the rule looks at the last selling price and the last selling price contains the middleman's margin.

If you buy and resell goods in transit, this is not a footnote. Your customer's import tax is calculated on the price you charged them, margin included, and your margin is legible inside that calculation. Price with that in mind, and tell your buyer before they discover it on a permit.

For dutiable goods the sum adds a step. Singapore Customs' published example uses a motor car bought at S$100,000 FOB with overseas freight, handling and insurance of S$1,000, giving a customs value of S$101,000. At an excise duty rate for motor cars of 20% of the customs value, duties payable are S$20,200, and GST is charged on the customs value plus that duty (Singapore Customs). Duty first, then GST on the duty-inclusive figure.

Whether your own goods are dutiable at all is a separate question, decided by classification rather than by valuation. Singapore Customs publishes the list of dutiable goods (Singapore Customs), and our HS code classification guide covers the step where that gets decided. If import GST timing rather than the amount is your pressure point, deferring GST on imports is a different lever worth understanding.

Where do we push back on a client's declared value?

Habits from the desk, and the reasoning behind each one.

• We do not accept a goods-only invoice as the declared value on EXW or FOB terms. Both terms exclude costs the customs value has to include, so the figure is incomplete by definition rather than by accident.

• We do not treat a free-of-charge shipment as a zero-value one. Samples, warranty replacements and branch transfers have no price paid, which is a reason the transaction value method may not apply. It is not a reason the value is nil.

• We do not let an intra-group price go out unexamined. Related-party pricing is one of the four conditions Singapore Customs attaches to the transaction value method, and the arm's length question is far cheaper to answer before a permit than after one.

• We do not reach for a flat rate when the actual freight figure exists. The flat rates are published for the case where actual charges are not known or not available. If you are holding the invoice, use the invoice.

• We do not guess on assists and royalties. If a client has tooling sitting with a supplier or a licence agreement behind the product, that goes to Singapore Customs or a customs adviser against the actual contract.

• We do not put a value on a permit that we cannot show the working for. The permit is the record. If the build-up is not written down anywhere, it does not exist on the day somebody asks for it.

And one we will say out loud, because it comes up. If the pressure on a shipment is to declare a lower value, the answer is no, and it is not a negotiation. There is a proper route for a genuinely difficult arrangement: Singapore Customs states that an importer may apply for a Customs ruling on valuation, based on the principles in the Customs (Valuation) Regulations, for a fee of S$165 inclusive of GST per application (Singapore Customs, last updated 18 August 2026).

Frequently Asked Questions

Does the freight charge really get taxed?

Not as a service in its own right, but it sits inside the value the tax is calculated on. Singapore Customs states the transaction value method is based on the CIF value and must include all charges incidental to the sale and delivery of the goods to Singapore, listing freight and insurance among them (Singapore Customs). A higher freight figure therefore produces a higher tax figure on identical goods.

My supplier sent free samples. What value do I declare?

Not zero, and not a number you invent. Singapore Customs requires evidence of a sale as one of the conditions for using the transaction value method (Singapore Customs). With no sale there is no transaction value, so the value has to be established another way, using the published alternatives. Put the specific consignment to your declaring agent or to Singapore Customs rather than guessing.

I import from my own overseas parent company. Is that price acceptable?

It can be, but it is examined. Singapore Customs lists the requirement that the relationship between importer and supplier must not influence the transaction value (Singapore Customs), and states that prices between related parties must follow the arm's length principle (Singapore Customs). Be ready to show how the price was set.

Which exchange rate applies if my invoice is in US dollars?

Singapore Customs states that costs in a foreign currency are converted using the prevailing weekly average exchange rates published by the Monetary Authority of Singapore, at the time customs duty or excise duty is paid (Singapore Customs). Singapore Customs publishes the rates (Singapore Customs).

Can I use the flat rate instead of working out the actual freight?

Only in the situation the flat rate was published for. Singapore Customs states the flat rates for freight and insurance apply where the transaction value is quoted FOB and the actual charges are not known or not available to the importer (Singapore Customs). If you hold the actual figures, they are the ones to use.

Can I get Singapore Customs to confirm a valuation before I ship?

Yes, through an advance ruling. Singapore Customs states that an importer who needs clarity on how the valuation rules apply to a specific arrangement may apply for a Customs ruling on valuation, at a fee of S$165 inclusive of GST per application, submitting the application form with a letter of enquiry, a description of the arrangement, supporting documents and a proposed valuation treatment (Singapore Customs).

The value is a calculation, not a number you copy across

The customs value is built, not copied. Your supplier's invoice is an input to it. So is the freight invoice, the commission you paid an agent, the tooling you funded two years ago, and the licence fee that never touched the shipping file.

The practical version is short. Before the next consignment, write the build-up out as line items with a number against each, the way Singapore Customs does in its own examples. If a line has no number, you have found the question to ask. If a line has a number nobody can source, you have found the risk.

If shipping terminology is still doing you more harm than good, our shipping and customs glossary defines the terms above in plain language, and our guide to customs clearance in Singapore walks the process the value feeds into. If you would rather test this against a live consignment, send us the commercial invoice, the freight invoice and the Incoterm before the cargo moves, and we will tell you which costs belong in the value while there is still time to budget for them.

One honest closing note. Nobody is asking you to become a valuation specialist. You are being asked to know that the number exists, that it is bigger than your invoice, and that it is built from things you already know. That is enough to stop the surprise, which was the expensive part.

Written by Iman Yusoff, Director of IFG Shipping Pte Ltd. In shipping since 1999. Board Member and Secretary at the Singapore Malay Chamber of Commerce and Industry.

Disclaimer: rules and rates vary by lane and by date. The figures above are as at the dates cited in the sources linked in this article. Confirm current requirements with Singapore Customs, IRAS, the named regulations, or your freight forwarder before acting. This article is general education, not legal or tax advice, and IFG Shipping is not affiliated with or acting for any government body.