Import duty and GST on building materials from China: a builder's guide
14 June 2026 · 9 min read
Why duty and GST decide whether a China order pays off
A builder finds a window package or a benchtop set from a Chinese factory at a third of the Australian price, books it, and then gets a bill at the wharf that nobody mentioned. The factory quote is only part of the story. Import duty from China to Australia and the 10% GST, plus the way each is calculated, commonly add 15 to 20% on top of the goods value, and getting them wrong is how a clear saving turns into a nasty surprise.
The better news is that for most building materials the rules are predictable. Duty is often 5%, and frequently nil under the China Australia Free Trade Agreement, and you can model the whole landed cost before you commit. This guide covers how duty and GST work on building materials, a worked example, and the traps that catch first-time importers. Treat the rates here as planning ranges and confirm the specifics for your product with a licensed customs broker, because tariff classifications and anti-dumping measures change.
How import duty works on building materials
Customs duty is charged on the customs value of the goods, which is usually the FOB (free on board) price you pay the factory, before freight and insurance. The general rate for many finished building products is 5%, but two things often bring it down to zero.
The first is the China Australia Free Trade Agreement (ChAFTA). Most goods of genuine Chinese origin enter Australia duty-free when the shipment is accompanied by a valid Certificate of Origin and the product meets the rules of origin. The second is that some categories carry a general rate of nil regardless.
As a planning guide for common categories sourced from China:
| Product category | General duty rate | Under ChAFTA (valid Certificate of Origin) |
|---|---|---|
| Aluminium windows and doors | up to 5% | typically free |
| Kitchen and bathroom cabinetry | up to 5% | typically free |
| Ceramic and porcelain tiles | up to 5% | typically free |
| Stone and porcelain benchtops | up to 5% | typically free |
| Tapware and bathroom fittings | up to 5% | typically free |
| Lighting fittings | up to 5% | typically free |
| Furniture | up to 5% | typically free |
| Engineered and timber flooring | up to 5% | typically free |
These are indicative. The exact rate depends on the tariff classification (HS code) of your specific product, so have your broker confirm the line before you order.
How GST is calculated (the part people get wrong)
GST is 10%, but not 10% of the factory price. It is charged on the value of the taxable importation, which is the customs value plus any duty plus the international transport and insurance to get the goods to Australia. So GST sits on top of duty and freight, not just the goods.
A simple worked figure. Say the goods are $30,000 FOB, freight and insurance are $3,500, and duty comes in at nil under ChAFTA:
- Customs value: $30,000
- Duty: $0
- Transport and insurance: $3,500
- Value of the taxable importation: $33,500
- GST at 10%: $3,350
If duty had applied at 5%, that $1,500 of duty would also be added before the GST is worked out, so the GST base rises with it.
One important distinction. If you are registered for GST and importing for your business, you generally claim the import GST back through your BAS, and the deferred GST scheme can stop it hitting your cashflow at all. An owner-builder who is not registered for GST cannot claim it back, so for them the 10% is a real cost, not a wash. Confirm your position with your accountant.
ChAFTA and the Certificate of Origin
The single document that most often takes duty from 5% to zero is the Certificate of Origin. Without it, customs has no basis to apply the ChAFTA preferential rate, and you pay the general duty.
A few practical points:
- The factory or its agent arranges the Certificate of Origin, commonly issued through CCPIT or Chinese customs authorities. Ask for it as a condition of the order.
- The goods have to actually qualify as Chinese origin under the rules of origin. Product genuinely manufactured in China normally qualifies. Goods merely trans-shipped through China do not.
- The certificate has to be valid and match the shipment. Errors in description, quantity, or consignee can see it rejected, and that means duty applies.
A good customs broker checks the certificate before the goods land, not after. This is one of the clearest reasons to use a broker rather than handle clearance yourself.
A realistic landed-cost example
A consolidated order with a factory value of $30,000 FOB, shipped in a shared 40ft container, duty nil under ChAFTA:
| Item | Amount (AUD) |
|---|---|
| Factory price (FOB) | $30,000 |
| Sea freight and insurance | $3,500 |
| Customs duty (nil under ChAFTA) | $0 |
| GST (10% of value + duty + freight) | $3,350 |
| Customs clearance and broker fee | $300 |
| Port and quarantine charges | $600 |
| Transport to site | $700 |
| Total landed | roughly $38,450 |
Import duty and GST together added about $3,350 here, or roughly 11% of the goods value, almost all of it GST that a registered builder claims back. If duty had applied at 5%, add about $1,500 of duty plus $150 of extra GST. For a sense of how the freight side moves, see our guide to container shipping costs from China to Australia.
Anti-dumping: the separate bill to watch
Duty and GST are the predictable part. Anti-dumping and countervailing measures are the unpredictable part, and they sit completely outside the normal 5% duty band.
Australia has active anti-dumping measures on certain Chinese products, including some aluminium extrusions that feed into window and door frames. Where these apply, the additional duty can run from a few per cent to over thirty per cent of the goods value, depending on the product and the specific exporter. It is assessed separately from ordinary customs duty and is not removed by ChAFTA.
This is why the factory you choose matters for cost, not just quality. If you are importing anything aluminium-framed, read our guide to anti-dumping duties on Chinese aluminium windows and confirm exposure with your broker before you order. For the product compliance side, our windows and doors category page sets out what to demand from a factory.
Common mistakes when budgeting duty and GST
Anchoring on the factory price. The quote that excites you is the FOB price. Add freight, duty, GST, clearance, and delivery to see the real number, and budget 15 to 20% over goods plus freight as a starting point.
Forgetting the Certificate of Origin. No valid certificate means no ChAFTA rate, which means you pay duty you could have avoided. Make it a condition of the order.
Calculating GST on the goods alone. GST is charged on the goods plus duty plus freight and insurance, so the base is always higher than the factory price.
Assuming an owner-builder gets the GST back. Only a GST-registered importer can claim import GST. If you are not registered, treat the 10% as a real line in your budget.
Ignoring anti-dumping until the bill arrives. It is separate from ordinary duty, it is not covered by ChAFTA, and on the wrong aluminium product it dwarfs everything else. Check before you commit.
Frequently asked questions
How much is import duty from China to Australia on building materials? The general rate for many finished building products is up to 5%, but most goods of Chinese origin enter duty-free under ChAFTA when a valid Certificate of Origin accompanies the shipment. Confirm the rate for your specific product with a customs broker.
Do I pay GST on goods imported from China? Yes. GST of 10% applies to the value of the taxable importation, which is the customs value plus duty plus international transport and insurance. GST-registered importers generally claim it back through their BAS.
Does ChAFTA make everything duty-free? It removes duty on most qualifying goods of genuine Chinese origin, but you need a valid Certificate of Origin and the product must meet the rules of origin. Anti-dumping measures are separate and are not removed by ChAFTA.
Threadline models the full landed cost before you order, arranges the Certificate of Origin with the factory, and works with a licensed broker so duty and GST are right the first time. If you want a realistic landed estimate for your project, start a request.
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