Invoicing for Import/Export Businesses in Thailand: Currency, VAT, and Withholding Tax

Invoicing Challenges Unique to Import/Export Businesses

Trading businesses in Thailand deal with a mix that most local service businesses never see on one invoice: foreign clients paying in dollars or euros, domestic B2B clients paying in baht, VAT that behaves differently depending on whether goods cross the border, and withholding tax on domestic service and commission invoices. None of it is complicated in isolation — the friction comes from handling it consistently, invoice after invoice.

Bill Foreign Clients in Their Currency, Report Back in THB

Lemon Invoice lets you invoice overseas buyers in USD, EUR, or any currency the deal is priced in, while your domestic invoices to Thai clients stay in THB — both live on the same dashboard.

Worth being clear about upfront: Lemon Invoice doesn't set or guarantee an exchange rate, and it isn't a payment processor. You choose the currency and amount on the invoice; the actual conversion back into THB — and whatever fees your bank or payment provider charges for it — happens outside Lemon Invoice, between you and whoever moves the money. Price a shipment in USD with that in mind: what lands in your THB account depends on your bank's rate and fees on the settlement day, not a figure Lemon Invoice quotes you. For your own reporting, the dashboard still rolls every invoice back into your business's home currency, so a month with clients paying in dollars, euros, and baht adds up to one clear THB total.

Per-Line VAT: Domestic 7% vs. Export 0%

Domestic sales in Thailand generally carry 7% VAT, applied per line item. Exported goods and certain qualifying services are typically taxed at 0% rather than at the standard rate — a numeric rate on that line, not a separate scheme to configure. Whether a specific shipment or service qualifies for the 0% rate is a question for your accountant, based on the actual export documentation; Lemon Invoice doesn't determine that for you.

Once you know the rate that applies, Lemon Invoice calculates it the same way on every invoice: enter the net amount and the rate per line, and net, VAT, and gross are worked out automatically — whether that's a 7% domestic line or a 0% export line, sitting on the same invoice if a shipment mixes both.

Withholding Tax on Domestic B2B Receipts

Sell components, freight-forwarding, or other services to a Thai business client, and that invoice can be subject to Thailand's standard withholding tax alongside VAT. Lemon Invoice handles this the same way it does for any Thai customer:

• Auto-flags customers based in Thailand. Set a customer's country to Thailand, and Lemon Invoice automatically flags them for withholding tax — useful when a single import/export business is juggling both domestic and overseas clients on the same customer list.
• Auto-calculates the standard 3% on the net amount. Calculated on the pre-VAT amount, consistent with the standard rate for most service and commission invoices.
• Shown on the receipt. When you record payment, the withheld amount appears clearly on the receipt, so the amount that actually lands in your account reconciles with your records.

This only applies to Thailand-based customers — an overseas buyer paying in USD or EUR isn't affected. What Lemon Invoice doesn't do: issue the official withholding tax certificate, file it with the Revenue Department, or let you configure a custom withholding rate. That stays with your client (or your own process, if you're the one withholding) and your accountant.

Incoterms: Useful Shorthand, Not a Customs Filing

If your invoices reference terms like FOB, CIF, or EXW, Lemon Invoice lets you add that as descriptive text on the invoice — a shorthand your buyer and freight forwarder already understand for who's responsible for shipping, insurance, and risk at each stage. It's worth being clear that this is descriptive only: Lemon Invoice doesn't file customs declarations, doesn't validate which Incoterm applies to your shipment, and isn't connected to customs or freight systems. Noting the term on the invoice is a convenience for your paperwork trail, not a customs submission.

One Dashboard for Domestic and International Trade

An import/export business doesn't need two separate tools for its two kinds of invoices. In Lemon Invoice:

• Bill overseas clients in their currency; bill domestic clients in THB — both tracked on one dashboard
• Add VAT per line item, 7% domestic or 0% export, with net, VAT, and gross calculated automatically
• Track every invoice as paid, partially paid, or overdue, regardless of currency
• Domestic Thai customers are auto-flagged for the standard 3% withholding tax on the net amount, shown on the receipt — overseas customers aren't affected
• Turn a quotation into an invoice, and an invoice into a receipt, without retyping client or line-item details, in any currency

A Simple Example

Say you export a shipment to a buyer in the US for $8,000, FOB noted on the invoice, taxed at 0% VAT. The same week, you invoice a Thai freight-forwarding partner 30,000 THB for local handling services, with 7% VAT — 2,100 THB VAT, 32,100 THB gross — and that customer is auto-flagged for the standard 3% withholding tax (900 THB on the net amount), shown on the receipt once paid. Both invoices sit on the same dashboard — the dollar invoice tracked in dollars, the baht invoice tracked in baht — and your overview still rolls up to one clear THB total.

Who This Helps Most

If you're an import/export business, trading company, or freight-related service provider in Thailand billing both overseas and domestic clients, invoicing built for exactly this mix keeps both sides of the business on one clean set of documents, instead of juggling separate spreadsheets or tools for domestic and export invoices.

Keep Trade Invoicing Organized from the First Shipment

Import/export invoicing doesn't have to mean separate systems for separate currencies and tax treatments. Bill in the right currency, apply the right VAT rate per line, and let Lemon Invoice flag domestic withholding tax automatically — so the conversation with your accountant is about the numbers, not about reassembling them from scattered documents.