How a Hanoi Pho Restaurant Invoices Its Corporate Lunch Clients

Phở Bà Tâm is a 22-seat restaurant in Hanoi's Ba Đình district. The walk-in business is brisk — locals at 7am, office workers at noon, occasional tourists trying to find "real" pho — and runs on cash and the occasional QR-payment scan. None of this requires an invoice.

The other side of the business does. Three years ago, Tâm started taking weekly corporate lunch orders from nearby offices — embassies, regional offices of multinational companies, a Korean trading firm, a French law office. Each Monday she sends out 15-30 bowls to a single client, packed in their preferred containers, billed monthly. By 2025 this side of the business had become 35% of her revenue.

The walk-in side runs itself. The corporate side requires actual invoicing — and very specific, locally compliant invoicing, because every one of her corporate clients needs proper VAT receipts for their books.

Here's how a small restaurant runs a serious B2B operation alongside its walk-in business.

The unique demands of F&B B2B invoicing

Dual-language invoices

Her Vietnamese clients (the local law office, a Vietnamese trading company) need Vietnamese-language invoices. Her foreign clients (the French and Korean offices) prefer English. Both expect properly formatted VAT details. The same restaurant. Two language variants. Same line items.

Weekly recurring orders with weekly variation

Each client has a roughly standard order ("15 bowls of pho bo, 5 spring roll sets") but the quantities vary week to week as people are out of office or visitors are in town. The base order is recurring; the specific quantities are not.

VAT invoicing in VND

Vietnam requires electronic VAT invoices for B2B transactions above a certain threshold. The format is strict: tax codes, item descriptions in Vietnamese, VAT breakdown (typically 8% for food services in Vietnam, recently changed from 10%), signature, and a unique invoice number registered with the tax authority.

Monthly batch billing

Most of her corporate clients want one monthly invoice covering all the weekly orders, not four separate weekly ones. Their AP departments process monthly batches more efficiently.

Cash flow timing

Corporate clients pay on 30-day terms, sometimes 45. The walk-in restaurant produces cash daily; the corporate side produces invoices weekly and cash monthly-plus-30. Tâm has to manage working capital across both timing patterns.

The setup

Two business sides, one invoicing app

Tâm uses business profiles to separate the walk-in side (which uses an in-restaurant POS) from the corporate B2B side (which uses the invoicing app). The corporate side has its own VAT-registered legal entity name on invoices, its own bank details, its own invoice numbering.

Per-client recurring weekly orders

Each corporate client has a recurring schedule with their default order — items and standard quantities. The schedule generates a draft each Monday morning. Tâm's daughter, who handles the corporate side, reviews each draft against the actual order received, adjusts quantities, and saves the line item.

The weekly drafts are not sent immediately. They accumulate.

Monthly batch invoicing

At month-end, all the weekly drafts for a single client are aggregated into one monthly invoice. The invoice shows each weekly delivery as a sub-section ("Week of 5 May," "Week of 12 May," etc.) with that week's specific quantities and totals, then a monthly grand total.

This is the format her corporate clients want — detailed enough to verify, summarized enough to process in one AP transaction.

Bilingual line items

Each menu item is stored with a Vietnamese name and an English name. Vietnamese clients receive invoices in Vietnamese; English clients receive them in English. Same SKUs underneath. No double-entry.

Vietnamese e-invoice integration

For VAT-eligible invoices, her setup integrates with the Vietnamese tax authority's e-invoice system. The invoice number is generated against the tax authority's central registry; a QR code linking to the official record is embedded in the PDF. This satisfies the legal requirement and gives clients confidence the invoice is real.

The financial picture

By year three of running the corporate side this way:

• 12 active corporate clients.
• ~50-70 weekly deliveries.
• ~35% of total restaurant revenue.
• Roughly 30 minutes per week of invoicing labor (split between Tâm's daughter and Tâm herself).

The corporate side has a different margin profile than walk-in. Higher per-bowl revenue (premium for delivery, dedicated containers, dietary customization) but offset by transport costs, packaging costs, and the slower payment cycle. Net margin works out roughly equivalent — but the corporate side smooths out revenue across the month, which the cash-day-by-day walk-in side doesn't.

What changed when invoicing improved

Larger clients became possible

Two of her current corporate clients (the embassy and one of the multinationals) explicitly require e-invoice with full VAT compliance. Without it, she couldn't have taken those accounts. Compliant invoicing was the entry ticket.

The expat-office segment opened

Properly formatted English invoices were a barrier to selling to foreign-managed offices. Once she could produce them, this segment grew from 2 clients to 7 in eighteen months. They tend to pay faster than Vietnamese clients (the French law office is on net-14 by their own preference).

The monthly batch removed administrative friction for clients

When she sent four weekly invoices, AP teams complained about the processing overhead. The monthly batch — with weekly sub-totals — fixed this. Renewal rates improved. Several clients have specifically said the cleaner billing was the reason they stayed.

The wider lesson for small F&B businesses

Many small restaurants underprice their corporate work because they treat it as walk-in business with delivery added on. It isn't. Corporate work has fundamentally different economics: longer payment cycles, higher compliance requirements, larger order sizes, different margin structure, different client expectations.

Treating it correctly — with proper invoicing, monthly batching, dual-language formats where applicable, and VAT-compliant electronic invoices — opens larger accounts and produces better-quality revenue.

Treating it as walk-in-plus-delivery caps you at the small-order, low-friction clients who don't care about format. Those clients exist. They aren't the ones who grow your business.

What every small restaurant should set up if going B2B

1. Separate the two sides operationally

Walk-in: POS. Corporate: invoicing app. Don't blend.

2. Per-client recurring weekly orders

Capture the standard order. Let the system generate drafts. Adjust per delivery.

3. Monthly batch billing

Aggregate weekly deliveries into one monthly invoice with weekly sub-sections.

4. Bilingual menu where applicable

Vietnamese + English for Vietnam; Spanish + English for Mexico; Arabic + English for Gulf states. Match your local expat market.

5. Local e-invoice compliance

Vietnam, Mexico, Brazil, Italy, Spain, and many others now require electronic invoicing for B2B transactions. Build it in from day one.

6. Track per-client margin

Some corporate clients are highly profitable. Others, after transport and customization, barely break even. Track this and act on it.

Tâm's last word

"The corporate side is more work per bowl than walk-in. It's also more revenue. The work is mostly invoicing. Once that's organized, the work is mostly cooking. And cooking, I know how to do."

Phở Bà Tâm is still 22 seats. The kitchen, however, now serves four times that capacity through the door it can't be seen from. Quiet expansion, properly invoiced.