Thailand Manufacturing: Build a Landed Cost Model
Buyers in the US, UK, EU, Japan and Australia rarely lose money on Thai manufacturing because the unit price was wrong. They lose it because the model stopped at FOB. This guide rebuilds the model line by line so the decision to import or manufacture from Thailand rests on the number that actually hits your P&L.
Why FOB comparisons mislead
A domestic quote is usually delivered, duty-paid, inspected and payable in 30 days. A Thai FOB quote is none of those things. Comparing the two side by side flatters Thailand by 15-30% and then surprises you in month four.
The full cost stack
| Line item | Typical range | Notes |
|---|---|---|
| Ex-works unit price | Base | Confirm currency and validity period |
| Domestic haulage to port | 1-3% | Laem Chabang or Bangkok Port |
| Export documentation | 0.3-1% | CO (Form E/AI/D), packing list, invoice |
| Ocean freight | 3-12% | FCL far cheaper per unit than LCL |
| Marine insurance | 0.2-0.5% | Institute Cargo Clauses A |
| Import duty | 0-12% | Check FTA eligibility before assuming MFN |
| Customs brokerage | 0.3-1% | Per entry, not per unit |
| Inland delivery + 3PL intake | 2-5% | Often the most underestimated line |
| Inspection and testing | 0.5-2% | AQL inspection, lab reports, retests |
| Tooling amortisation | Varies | Divide tool cost by realistic 24-month volume |
| Working capital cost | 1-4% | 45-75 days of cash tied up in transit |
| Quality and scrap reserve | 1-3% | Set from first-year data, not hope |
Worked example
A 20,000-unit annual SKU at USD 6.20 ex-works, tooling USD 18,000, 40ft FCL freight USD 2,900, 4.2% duty:
- Ex-works: 124,000
- Freight, haulage, docs, insurance: 4,600
- Duty and brokerage: 5,600
- Inland and 3PL: 4,300
- Inspection: 1,800
- Tooling (24-month amortisation): 9,000
- Working capital at 9% for 60 days: 1,900
- Quality reserve 2%: 2,500
Landed total: USD 153,700, or 7.69 per unit — 24% above the ex-works figure. If your domestic delivered price is 8.90, the saving is real but 13%, not 30%.
Where the model breaks
- Volume assumptions. Tooling amortised over volume you never reach turns a win into a loss.
- Currency. Quote in one currency and hold it for the PO term; do not let THB/USD drift eat the margin.
- Air freight rescues. One expedited shipment can erase a quarter of savings. Budget one per year.
- Change orders. Engineering changes after tooling cut steel are the most common cost surprise.
Decision thresholds we use
- Under 10% modelled saving: stay domestic unless capacity is the constraint.
- 10-20%: proceed, but only with dual-source protection and a firm quality plan.
- Over 20%: strong case; invest in supplier development and a resident inspection routine.
Make the model auditable
Keep one spreadsheet per SKU family, with every assumption sourced and dated. Finance should be able to re-run it without you. When you review quarterly, replace estimates with actuals — most buyers find inland logistics and quality reserve are the two lines that move.
Related reading: Thailand vs Reshoring TCO, Dual Sourcing Strategy, Full Cost Breakdown.
Frequently Asked Questions
What percentage should I add to an FOB quote to estimate landed cost?
For developed-market destinations, 18-28% is a realistic planning band for FCL shipments, and higher for LCL or air freight.
How long should I amortise tooling over?
Use the volume you are confident of in 24 months, not the optimistic forecast. If the tool survives longer, that is upside.
Does an FTA always reduce duty to zero?
No. Preferential rates depend on the product's HS code and origin rules, and you must hold a valid certificate of origin at entry.
How often should the model be refreshed?
Quarterly, and immediately after any freight-rate shift, tariff change or supplier price revision.