PCBA Quote Structure: What China Assembly Quotes Include

PCBA quote structure: what should the price cover?

PCBA means printed circuit board assembly and can refer to the assembly process or the populated board. A useful quote identifies what you will receive, which work is included and which costs remain payable separately. Treat the following as a purchasing checklist, rather than a universal supplier price format.

Ask for recurring production costs, one-off charges and delivery costs separately. If a supplier bundles several items into a finished-board price, request written confirmation of the underlying scope.

Use the same controlled design package for every enquiry. See the Gerber, BOM and CPL file guide when preparing your production files.

Turnkey, consigned or mixed component supply

Under turnkey supply, the assembler purchases the components within the agreed scope. Confirm whether the quote includes every populated BOM item, component procurement charges and delivery to the assembly site. Confirm testing, import taxes and delivery to your address separately rather than inferring their inclusion from the word turnkey.

Under consigned supply, you provide components for assembly. Agree the receiving checklist, packaging requirements, quantity reconciliation, handling losses, replacement responsibilities and return of unused material. Include your own component purchase and transport costs when comparing this with turnkey supply.

For mixed supply, mark each BOM line as buyer-supplied or supplier-purchased. Record who resolves shortages and who pays for replacement material, storage and additional shipments.

Ask who owns surplus components and whether they will be returned, stored against your next order or otherwise dealt with under written instructions.

MOQ and lead time: separate board quantity from component purchases

Ask for the minimum assembly order separately from minimum bare-board quantities and component purchase requirements. Ask whether packaging requirements, minimum purchase quantities or assembly overages will leave paid-for stock beyond the quantity fitted to your boards.

For a prototype or small batch, compare the total cash commitment, including unused components and setup, rather than choosing solely by the quoted unit price. Larger buyers should also ask how repeat orders reuse approved material and tooling.

Request a schedule that separates component procurement, board fabrication, assembly, programming, testing and transport. Confirm which stages can overlap and which depend on approval.

Define when the lead-time clock starts: for example, after payment, release of approved files or receipt of all components. Ask whether quoted stock is reserved and what happens if availability changes before purchasing.

Component shortages and substitutions: approve the change before purchase

Require unavailable or uncertain BOM lines to be identified in the quote. Ask for the proposed source, availability status, price validity and any non-cancellable purchasing commitment before authorising procurement.

Do not leave substitutions to an undefined promise of equivalent parts. Make the proposed manufacturer part number, datasheet, explanation of differences and your written approval contractual requirements before purchase or assembly.

Review electrical ratings, package and footprint, temperature range, firmware dependencies and relevant compliance evidence. Require an engineering assessment of any necessary design changes or additional testing before accepting a substitute.

Agree how a shortage or substitution changes price, schedule, test coverage and warranty arrangements. Preserve the approved BOM revision and actual fitted-component record with the order.

Testing: ask what a pass actually proves

Ask the supplier to name each inspection or test instead of accepting a single line saying tested. Request separate descriptions of the coverage of automated optical inspection, electrical checks, programming verification and functional testing.

Provide a functional test specification with operating conditions, connections, measurable limits and the required results record. Confirm whether every delivered board is tested or whether a sampling plan is proposed.

Separate fixture development from the recurring cost of running the test. Agree fixture ownership, access to test software, maintenance and the changes needed when the design or firmware changes.

Define the response to a failure: diagnosis, rework approval, retesting, replacement and responsibility for the associated costs. Assess finished-product regulatory requirements separately; do not treat production inspection or a basic power-on check as evidence of compliance with all applicable requirements.

How to compare PCBA quotes fairly

Give each supplier the same design revision, populated BOM, quantity, component-supply arrangement, test specification, packing requirements and destination. Record every supplier exception alongside the price.

Build a comparison total from recurring production charges, one-off charges, buyer-supplied material, agreed excess stock, packing and delivery. Show duties and import taxes separately using the destination's applicable treatment. Identify any setup cost already absorbed into the unit price so it is not counted twice.

Compare the initial build and repeat-order costs separately. Check currency, payment milestones, quote expiry, cancellation terms, defect remedies and the effect of engineering changes.

Use the supplier quote checker when reviewing missing terms. Establish the deliverables and remaining costs before comparing headline prices.

If you sell in the US or EU

US customs — checked 2026-10-18: CBP identifies the importer of record as ultimately responsible for correct entry documentation and applicable duties, taxes and fees, even when using a broker. Ask your broker to confirm the entry arrangements, documents and costs separately from the supplier's shipping charge.

US tariffs — checked 2026-10-18: USTR's Section 301 search provides information about coverage and additional duty rates by HTS subheading. Confirm the classification and all measures applicable when entering your goods; do not assume every PCBA has the same tariff treatment or use the Section 301 result as a complete import-cost calculation.

US medical-device applications — checked 2026-10-18: FDA verifies applicable medical-device import requirements, including registration, listing and premarket requirements where required. If your assembly is intended for such an application, establish its regulatory treatment before agreeing the necessary evidence and associated costs.

EU — checked 2026-10-18: the European Commission states that CE marking is required only for products covered by legislation requiring it. Establish the applicable requirements for the assembly and intended finished product before agreeing compliance testing and documentation costs.

UK worked example: an assembly invoice is not always the customs value

For an import into Great Britain, consider a build using components supplied free of charge by the buyer. Where Method 1 applies, HMRC requires the value of incorporated buyer-provided components to be included if absent from the seller's price. Method 1 requires a qualifying sale for export; it cannot be used where there is no sale. Ask your customs agent to establish the valuation method rather than treating an assembly-service invoice as the customs value. Guidance checked 2026-10-18.

HMRC requires relevant transport and insurance costs to the UK entry point in the customs value. Import VAT valuation starts from customs value and includes applicable import duties and qualifying incidental expenses, including those to the first UK destination and a further UK destination known at importation. Ask your agent to distinguish costs already included. Guidance checked 2026-10-18.

Keep component purchase records, assembly invoices and freight breakdowns available for the customs agent. This is a destination-specific example; buyers elsewhere should establish their own valuation and tax treatment.

Preparing an enquiry for Cambridge China Bridge

Prepare your design revision, component-supply preference, order quantity, test requirements, destination and required delivery date. Include existing quotes and highlight unresolved component or tooling assumptions.

Whether you are an individual, a small business or a larger purchasing team, use the same comparison checklist. For help defining a limited production purchase, see small-order sourcing and agree the deliverables before commissioning work.