Capacity Planning with Thai Factories (2026)
Buyers who import finished goods buy from stock. Buyers who manufacture buy time on someone else's machines — and that time is allocated to whoever forecasts, commits and communicates best. Here is how to make sure your order is the one that gets built.
How Thai factories actually allocate capacity
Most mid-sized Thai factories plan on a 4–8 week visible horizon and hold the line for customers who provide rolling forecasts. Priority typically goes to, in order: contracted volume commitments, repeat customers with a forecast, then spot orders. A first-time buyer sending a one-off PO in a busy quarter sits last.
The rolling forecast that gets you priority
Send a simple 6-month rolling forecast every month:
| Horizon | Status | What it means |
|---|---|---|
| Month 1 | Firm PO | Committed, material bought |
| Months 2–3 | Committed | Slots reserved, you accept material liability |
| Months 4–6 | Indicative | Planning only, no liability |
Even an imperfect forecast beats none. Factories plan material lots against it, which is where most of your lead time savings come from.
The Thai calendar you must plan around
- Songkran (mid-April): most plants close roughly 3–5 days; effective output drops for two weeks either side.
- Chinese New Year (Jan–Feb): Thailand does not close, but upstream Chinese material and component suppliers do — expect input delays of 2–4 weeks.
- Peak ocean season (Aug–Oct): space and equipment tighten before Western holiday demand. See the peak season shipping calendar.
- Rainy season (Jul–Oct): occasional flood disruption in some industrial provinces; ask where your factory sits relative to past events, and read factory shutdown contingency.
Safety stock maths, simplified
Cover the variability, not the average. A practical starting point:
Safety stock = average weekly demand × (worst-case lead time − normal lead time in weeks)
For a product with 8-week normal and 12-week worst-case lead time and 500 units/week demand, that is 2,000 units of cover. Hold it wherever your money is safest — factory-held finished goods, a Thai consolidation warehouse, or your destination 3PL.
When to dual-source
Add a second qualified supplier when any of these is true:
- One SKU is more than 20% of your revenue
- One factory holds more than 60% of your total volume
- The part sits on a single mould with no backup
- Your market has a hard seasonal deadline you cannot miss
Qualify the second source at low volume before you need it. Qualification under pressure always costs more.
FAQ
How far ahead should I book Thai factory capacity?
Send firm POs 8–12 weeks ahead for tooled parts and 4–6 weeks for simple fabrication, with a rolling forecast behind them. For peak-season delivery, add four weeks.
Will a factory hold capacity without a PO?
Rarely for long. A forecast gets you into the plan; a PO or a volume commitment with material liability is what actually reserves the slot.
How much does Songkran really cost me?
Plan on losing about two weeks of effective output across April, including ramp-down and ramp-up. Pull April shipments into March or accept a May arrival.
Should I keep safety stock in Thailand or at destination?
Destination stock protects your customer service level; Thai-side stock is cheaper to hold and more flexible across markets. Most importers split: fast movers at destination, slow movers upstream.
What is the earliest sign of a capacity problem?
Vague answers on the weekly production report and quietly slipping sample dates. Ask for machine-level scheduling data monthly; factories that share it are the ones that keep their promises.