Issue #1 took one £45,000 centrifugal-pump quote and walked it down a seven-line stack — FOB estimate, CIF uplift, CIF invoice, UK customs duty, port and clearance, last-mile, import VAT. Net landed cost: £45,605. Gross cash exposure before VAT recovery: £54,605–£54,726. The range reflects alternative assumptions about which incidental costs sit inside the import-VAT base. Every figure was tied to a documented source, a published benchmark, or an explicitly labelled assumption [9].
That was a worked example. This is not.
A worked example shows what numbers come out for one specific quote. A framework shows what to do with any quote. The hidden risk in Issue #1 is that a reader might treat all seven lines as if they carry equal weight, equal certainty, and equal source authority. They do not. Some lines are statutory facts that GOV.UK will confirm quickly. Some are published benchmarks that hold for a window of weeks. Some are model assumptions dressed as numbers because they share a column with the others. The most expensive mistake in landed-cost modelling is not getting a number wrong. It is treating an assumption as a fact.
This issue gives you the discipline to keep them apart.
Reader walks away knowing
- For context: where else can you get this
- The seven-line stack — and the three claim classes it carries
- Why the three-class system matters: what one trade-remedy notice does to a Class A line
- Gatekeeper view: what the supplier's side of the CIF quote looks like
For context: where else can you get this
GOV.UK's Trade Tariff can confirm the duty rate on a 10-digit commodity code quickly — but it does not tell you which of your other six lines are equally trustworthy. HMRC's Postponed VAT Accounting (PVA) and customs-valuation pages explain Line 7's mechanics — but assume you already have a clean view of Lines 3 and 4. Forwarder one-pagers price Lines 5 and 6 — but their commercial interest sits inside those numbers. This brief puts all seven lines side by side, separates them into three claim classes by source authority, and shows what one trade-remedy notice does to a line you thought was settled.
The seven-line stack — and the three claim classes it carries
Every number in a landed-cost model belongs to one of three classes. The class is not about a line's importance. It is about the type of evidence that supports the number.
Class A — Primary-source facts. The number is evidenced by a primary source: either a government-published rule, such as a tariff rate or VAT mechanism, or a transaction document, such as the supplier's quote or commercial invoice. The risk is not that the number has no source. The risk is that the source is misapplied: the wrong commodity code, the wrong origin, a stale tariff page, or a document that does not match the goods being cleared.
Class B — Published or quoted benchmarks. The number comes from an index, a published rate card, a port tariff, a forwarder tariff, or a broker quote. It holds for a window of time and needs a citation with a date. A rate card from January is not the same source as one from May. Class B claims age.
Class C — Model assumptions. The number has no single primary source for the specific shipment. It is derived from working ratios, parallel quotes, broker confirmations, forwarder estimates, prior comparable shipments, or internal modelling. The discipline is to label it as an assumption — and to require a parallel data point before treating it as committable.
Here is how each line in the seven-line stack maps:
| # | Line | Claim class | Source authority |
|---|---|---|---|
| 1 | FOB China-port estimate | C — Model assumption | Derived from buyer's working ratio of FOB to CIF; requires a parallel FOB quote before commitment |
| 2 | Implied CIF uplift | C — Derived assumption | Arithmetic: CIF minus FOB estimate; does not by itself prove seller cost, freight, insurance or margin |
| 3 | CIF invoice value | A — Transaction-document fact | Supplier quote or commercial invoice; primary transaction evidence |
| 4 | UK customs duty | A — Statutory/tariff fact | UK Integrated Online Tariff per 10-digit commodity code, country of origin, and applicable trade-remedy measures [1] |
| 5 | Port + clearance allowance | C — Composite allowance | Aggregated from port tariffs, broker confirmations and clearance estimates, presented as a working allowance; requires route-specific validation before commitment |
| 6 | Last-mile delivery | B if route-specific; C if illustrative | Forwarder rate card or route-specific quote where available; otherwise an illustrative estimate |
| 7 | Import VAT exposure | A mechanism; derived cash figure | The standard VAT rate is a published HMRC rate [4]; PVA mechanics are statutory [5]; the cash figure depends on Lines 3, 4, 5 and other incidental inputs, which may themselves be Class A, B, or C inputs [6] |
The most common analytical failure is a Class C line presented in the same numerical format as a Class A line, with no flag distinguishing the two. The procurement director reading the spreadsheet sees £280 for port clearance and £0 for duty in the same column. Both look like facts. One is. The other is a composite allowance that still needs validation.
Why the three-class system matters: what one trade-remedy notice does to a Class A line
Added duty = customs value × duty rateNet landed cost before import VAT = CIF value + duty + port/clearance + last-mileExample: £45,000 × 49.98% = £22,491 added duty. Add £280 clearance and £325 last-mile and the net landed-cost line moves from about £45,605 to about £68,096 before import VAT.Issue #1's worked example used commodity code 8413 7059 90 — centrifugal pumps, single-entry impeller, other. Third-country duty: 0.00% [1]. Line 4 was Class A and clean for that commodity code.
Now consider the same £45,000 CIF Felixstowe quote, but the commodity is a tin mill product falling within specified 10-digit codes under headings 7210 or 7212, used for food cans and pressed components. The TRA notice and the Trade Tariff measure table control the exact 10-digit scope; do not apply this example from the heading alone. The £45,000 value is illustrative only and is held constant to isolate the duty impact, not to imply a representative steel order size or typical tin mill order quantity. The base UK Global Tariff duty may be 0% depending on the specific code and applicable measures. A buyer running the seven-line stack on a tin mill quote in February 2026 would have produced a stack that looked structurally identical to the centrifugal-pump example.
On 13 March 2026, that stopped being true.
UK Trade Remedies Notice 2026/11, originally published on 12 March 2026 and effective from 13 March 2026, imposed a definitive anti-dumping duty on specified tin mill products originating from China [2]. The duty rates:
- Shougang Group and named subsidiaries (additional code 8A59): 27.85%
- All other Chinese exporters (additional code 8999): 49.98%
The measure runs for five years, expiring 12 March 2031. To qualify for the named-exporter rate, the importer must present a valid commercial invoice with an accompanying declaration. Without that documentation, the residual 49.98% applies regardless of the true origin.
For the same £45,000 CIF shipment, Line 4 is no longer £0:
| Scenario | Added duty | Approx. CIF + duty + allowances, excl. import VAT |
|---|---|---|
| Documented Shougang origin at 27.85% | £12,532.50 | £58,137.50 |
| All other Chinese exporters at 49.98% | £22,491.00 | £68,096.00 |
| Documentation incomplete | £22,491.00 (residual applies) | £68,096.00 |
Approximate net landed cost here follows the Issue #1 structure: £45,000 CIF invoice value + added duty + £280 port/clearance allowance + £325 last-mile allowance, excluding import VAT.
That is a Class A line — the kind that procurement systems and lenders treat as settled — moving by £12,532.50–£22,491 on a single quote. The import-VAT base rises with it, because VAT is calculated on customs value plus duty.
The framework's value lies not in any one stack. It lies in the discipline of re-running it whenever a primary source behind the stack might have changed.
Gatekeeper view: what the supplier's side of the CIF quote looks like
From a Chinese tin mill exporter's perspective, the named-exporter declaration required under TRA Notice 2026/11 to qualify for the Shougang rate is a paperwork item to produce on request. One form among many. The exporter's operations team files it alongside the commercial invoice, packing list, and bill of lading.
From the UK buyer's side, the same paperwork item can become a five-figure landed-cost variance if it is missing from the import file at clearance.
This asymmetry of stake on the same document is structural. For the supplier, the declaration is an export-documentation task to be produced alongside the commercial invoice. For the buyer, the cost of not having it at clearance can be five figures. The ordinary operational risk is not necessarily bad faith on any single party. It is commonly a handoff gap: between the team that negotiates the sale and the team that prepares export documentation, or between the exporter's procedures and the importer's pre-clearance checklist. The buyer who treats this as a standing item on every pre-shipment checklist materially reduces the risk. The buyer who relies on the supplier to remember carries it.
Where this framework breaks
Five boundary scenarios change which lines are facts and which are not.
1. Active anti-dumping or trade-remedy measure on the commodity code. The tin mill example above. Verify Line 4 against Trade Remedies Authority notices and the Trade Tariff measure tables before quoting. Additionally, the UK steel-products measure due to take effect on 1 July 2026 proposes a 50% out-of-quota tariff on listed steel product categories. GOV.UK states that changes may still be made before implementation, and that the government is exploring transitional treatment for goods contracted before 14 March 2026 and imported between 1 July and 30 September 2026. Treat this as a provisional measure pending final implementation details, not a settled cost. The 50% rate is as drafted; the scope, quota volumes, and transitional treatment remain open [3].
2. Destination not UK. If goods enter the EU first, or pass to an EU customer under Delivered Duty Paid (DDP) or Import One-Stop Shop (IOSS) arrangements, the UK seven-line stack does not describe the path. Lines 4 and 7 restructure around the destination jurisdiction's rules.
3. Incoterm not CIF. Under Ex Works (EXW), the buyer carries Lines 1 and 2 from the factory gate, including all China-side inland transport, export clearance, and origin charges. Under DDP, the seller carries Lines 4, 5, and 7 inside the headline number, removing their independent visibility. Each Incoterm reshapes which lines the buyer pays separately [7].
4. Preferential origin available. UK Trade Tariff pages may show preferential rows, including Developing Countries Trading Scheme (DCTS) and Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) entries, where qualifying origin rules apply. Commodity 8413 7059 90 is not a savings example because its third-country duty is already 0.00%. It is useful as a lookup example: the Trade Tariff page shows the third-country duty alongside preference rows, including DCTS and CPTPP entries. For commodity codes with a positive third-country duty, those preference rows may change Line 4 materially. Check the preferences table on the Trade Tariff page for the specific 10-digit code, not the third-country rate alone [1]. Preference rates apply only where the goods meet the relevant origin rules; a Chinese-manufactured pump would not qualify under a CPTPP row regardless of the listed rate [8].
5. Low-value consignments. Thresholds for low-value consignment relief have changed multiple times. This issue does not rely on any low-value threshold; confirm the current threshold and applicable rules at GOV.UK before assuming a small consignment escapes duty or VAT in the way it did historically.
In each scenario, at least one line in the stack changes class. The boundary check is the first question the framework asks before any number is entered.
Layer in the trends — what this means for your next quote
As of May 2026, two developments make the framework's discipline more valuable.
CPTPP All Members excluding Canada and Mexico preference rows are visible on the Trade Tariff page used in this example [1]. For UK importers considering supply alternatives in CPTPP-member economies, the preference column is the first source to check.
The UK steel measure proposes taking effect on 1 July 2026 [3]. Buyers with steel sourcing in H2 2026 should treat that as provisional pending final implementation, and re-run Line 4 against the final product scope before committing to in-flight purchase orders, including any transitional rules published before the effective date.
These are not the framework. They are reasons the framework needs to be re-run on a regular schedule.
Coming up
- Issue #3 — UK customs clearance and Postponed VAT Accounting (planned, date TBC). What CDS Data Element 3/40 actually does, the operational difference between the legacy CHIEF "Method G" election and PVA under the Customs Declaration Service, and where buyers lose money by accepting a forwarder's default.
- Issue #4 — UK customs and PVA worked example (planned, date TBC). The same £45K shipment with vs without PVA — a 90-day cash-flow walkthrough.
Sources
[1] UK Integrated Online Tariff, commodity 8413705990, Import duties section. Third-country duty 0.00%; preference rows include Developing Countries Trading Scheme entries and "CPTPP All Members excluding Canada, Mexico" at 0.00%. Legal base: S.I. 2020/1430 (UK Global Tariff). https://www.trade-tariff.service.gov.uk/commodities/8413705990 (accessed 2026-05-25). Tier 1.
[2] Trade Remedies Authority, "Trade Remedies Notice 2026/11: definitive anti-dumping duty on tin mill products originating from China". Notice originally published 12 March 2026 and effective from 13 March 2026 for 5 years, ceasing 12 March 2031. Duties: Shougang Group 27.85% (additional code 8A59); all other Chinese exporters 49.98% (additional code 8999). A valid commercial invoice with accompanying declaration is required to qualify for the named-exporter rate; otherwise the residual rate applies. Statutory authority: subsection 13(2) and paragraphs 20(5)(a) and (c) of Schedule 4, Taxation (Cross-Border Trade) Act 2018. https://www.gov.uk/government/publications/trade-remedies-notices-anti-dumping-duty-on-imports-of-tin-mill-products-originating-from-china/trade-remedies-notice-202611-definitive-anti-dumping-duty-on-tin-mill-products-originating-from-china (accessed 2026-05-25). Tier 1.
[3] HM Government, "UK's steel trade measure from 1 July 2026", published 2 April 2026. Information note provisionally sets out product scope, quota volumes and a 50% out-of-quota tariff; GOV.UK states changes may be made before implementation and that government is exploring transitional treatment for goods contracted before 14 March 2026 and imported between 1 July and 30 September 2026. Statutory authority: Taxation (Cross-Border Trade) Act 2018. https://www.gov.uk/government/publications/uks-steel-trade-measure-from-1-july-2026/uks-steel-trade-measure-from-1-july-2026 (accessed 2026-05-25). Tier 1.
[4] HMRC, "VAT rates". Standard rate 20%. https://www.gov.uk/vat-rates (accessed 2026-05-25). Tier 1.
[5] HMRC, "Check when you can account for import VAT on your VAT Return" (PVA eligibility and import-VAT-on-return mechanics). https://www.gov.uk/guidance/check-when-you-can-account-for-import-vat-on-your-vat-return (accessed 2026-05-25). Tier 1.
[6] HMRC, "Working out the VAT value using the customs value of the imported goods". https://www.gov.uk/guidance/working-out-the-vat-value-using-the-customs-value-of-the-imported-goods (accessed 2026-05-25 via live source replay). Tier 1.
[7] HMRC, "Customs valuation: Incoterms (Incoterms 2020)". https://www.gov.uk/guidance/customs-valuation/incoterms (accessed 2026-05-25 via live source replay). Tier 1.
[8] HMRC, "Check your goods meet the rules of origin". Preferential rates require goods to meet origin rules; origin is where goods have been grown, produced, or manufactured, and may not be the country where they are shipped or bought from. https://www.gov.uk/guidance/check-your-goods-meet-the-rules-of-origin (accessed 2026-05-25). Tier 1.
[9] The Landed Cost Brief, Issue #1 (published 4 May 2026). Cross-reference for the worked example comparator. Source log: docs/_issue-logs/SOURCE_LOG_ISSUE001.md. Internal.
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The Landed Cost Brief is published by Plinth&Co. plinthandco.com
Control points before commitment
- Take any open CIF quote on your desk and label every line as Class A, B, or C. The act of labelling exposes which numbers carry parallel-quote requirements before commitment.
- Look up the 10-digit commodity code on the UK Integrated Online Tariff [1]. Check the third-country duty, the standard VAT rate [4], and — critically — the trade-remedy and preferences sections. If a remedy is listed, do not proceed without the named-exporter declaration in the import file.
- Date-stamp every Class B line in your spreadsheet. A figure with no date cannot be defended in audit and quietly ages into a wrong number.
- Replace Class C labels with parallel-quote requirements before signing. "FOB estimate" is an instruction to obtain a parallel FOB quote, not a number to commit on.
- Subscribe to GOV.UK trade-remedies notices and UK Trade Tariff Stop Press alerts, then maintain an internal watchlist for the commodity codes in your sourcing footprint, at 4-digit heading level at minimum and 10-digit code level where recurring spend justifies it. Notice 2026/11 changed Line 4 by up to £22,491 on a £45,000 quote with effect from the day after original publication.
Where Plinth&Co adds control
Plinth&Co helps buyers keep facts, benchmarks and assumptions separate inside the landed-cost stack so one weak line does not contaminate the whole sourcing decision. This is a buyer-side planning note, not legal, tax, customs or carbon-accounting advice; confirm final treatment with appointed providers or qualified specialists before acting. This is not legal advice, not tax advice, not customs advice and not carbon-accounting advice. Plinth&Co is not a factory. Plinth&Co is not a customs broker. Plinth&Co is not a tax adviser. Plinth&Co is not a law firm. Plinth&Co is not a carbon-accounting adviser.
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