In international trade, documents play a critical role in pricing, payment, customs clearance, and compliance. Among the most commonly misunderstood documents are the Proforma Invoice (PI) and the ใบแจ้งราคาการค้า.
Although they look similar, they serve very different legal and operational purposes. Understanding the difference between a PI and an Invoice is essential for exporters, importers, and logistics professionals to avoid delays, payment disputes, and customs issues.
This guide provides a clear, detailed, and practical explanation of the differences between a Proforma Invoice and a Commercial Invoice.
What Is a Proforma Invoice (PI)?
A Proforma Invoice คือ preliminary quotation document issued by the seller to the buyer before shipment and often before production or booking.
It outlines the expected transaction details and helps the buyer make internal approvals, arrange payment, or apply for import licenses.
Key Characteristics of a Proforma Invoice
Issued before goods are shipped
Used as a quotation or offer
Not legally binding in most jurisdictions
Can be revised or updated
Often required for:
Import license applications
Opening a Letter of Credit (L/C)
Buyer’s internal approval process
Typical Information on a Proforma Invoice
Seller and buyer details
คำอธิบายสินค้า
HS Code (estimated)
Quantity and unit price
Total value (estimated)
Incoterms (FOB, CIF, DDP, etc.)
Estimated shipping date
Payment terms
A Proforma Invoice is essentially a “price confirmation before execution.”
What Is a Commercial Invoice?
A ใบแจ้งราคาการค้า is an official, final, and legally recognized document issued after the goods are shipped (or at the time of shipment).
It represents the actual sale transaction and is used by customs authorities to assess duties, taxes, and compliance.
Key Characteristics of a Commercial Invoice
Issued after order confirmation and shipment
Legally binding
Used for:
การผ่านพิธีการศุลกากร
Import duty and tax calculation
Bank settlement under L/C
Accounting and audit purposes
Must reflect actual shipped goods and final value
Typical Information on a Commercial Invoice
Invoice number and issue date
Seller and buyer legal names and addresses
Accurate product description
HS Code (final)
Quantity and unit price
Total transaction value
Currency
Incoterms
Country of origin
Shipping details (vessel/flight, port of loading & discharge)
Customs authorities rely on the Commercial Invoice as a primary declaration document.
Proforma Invoice vs Commercial Invoice: Side-by-Side Comparison
| ด้าน | Proforma Invoice (PI) | ใบแจ้งราคาการค้า |
|---|---|---|
| Issued When | Before shipment | After shipment |
| Legal Status | Non-binding | Legally binding |
| วัตถุประสงค์ | Quotation & confirmation | Customs & payment |
| Can Be Revised | ใช่ | No (except via correction) |
| Used for Customs | ไม่ | ใช่ |
| Used for Payment | Reference only | Official payment document |
| Invoice Number | Optional | Mandatory |
Why Both Documents Are Important in International Shipping
In real-world trade operations, both documents serve different stages of the same transaction.
How They Work Together
Proforma Invoice issued
Buyer confirms price and terms
Used for L/C opening or import permit
Order confirmed & goods shipped
Final quantities and values determined
Commercial Invoice issued
Used for customs clearance and final payment
Without a PI, buyers may face approval or financing delays.
Without a Commercial Invoice, customs clearance is impossible.
Common Mistakes to Avoid
Treating a PI as a Commercial Invoice
A Proforma Invoice cannot be used for customs clearance or duty calculation.
Mismatch Between PI and Invoice
Large discrepancies in price, quantity, or HS code may:
Trigger customs inspections
Delay clearance
Cause payment disputes
Missing Incoterms or Payment Terms
Both documents should clearly define Incoterms to avoid responsibility disputes over freight, insurance, and duties.
คำถามที่มักถูกถาม (FAQ)
Is a Proforma Invoice legally binding?
No. A PI is a non-binding document used for reference and confirmation only.
Can customs accept a Proforma Invoice?
No. Customs authorities require a ใบแจ้งราคาการค้า for clearance.
Can prices differ between PI and Commercial Invoice?
Minor adjustments are acceptable, but significant differences may raise red flags with banks or customs.
Is a Commercial Invoice the same as a tax invoice?
Not always. A Commercial Invoice is used for international trade, while a tax invoice is often required for domestic VAT/GST compliance.
Final Thoughts: Which One Do You Need?
Use a Proforma Invoice when:
Quoting prices
Confirming trade terms
Applying for licenses or L/Cs
Use a Commercial Invoice when:
Shipping goods
Clearing customs
Receiving final payment
Understanding the difference between a Proforma Invoice and a Commercial Invoice helps exporters and importers reduce risk, avoid delays, and ensure smooth international trade operations.
