Flows ERPFull-form tax invoiceswith VAT calculated for you
Both parties' tax IDs, the 7% VAT, and the required wording — all filled in on your own template.
One-month free trial before you buy.
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Everything a tax invoice needs
Seller and buyer names, addresses, and tax IDs, the document number and date, the item lines, and the VAT shown separately — all filled in on your own template.
- Both parties' tax IDs filled in
- All required fields
- Your template, your logo
- Automatic or manual numbering
Generate documents
Generated from contract SC-2026-041
On your company template · TH/EN/ZH
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VAT calculated for you
The amount before or after VAT comes from the contract, and the system calculates the VAT amount for you.
- VAT calculated automatically
- Subtotal, VAT, and total always match
- No calculator needed
- Amounts come from the contract
Contract SC-2026-041 · Bangkok Trading
@Somchai please follow up period 3
Logged on the contract · visible to the team
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Issue it when it suits your business
Companies issue tax invoices at different points — when billing, when paid, or when goods are delivered. In Flows, you decide when to issue them, based on how your business works.
- You choose when to issue
- Kept in the Document Management module
- Open or download any past copy
- Thai, English, or Chinese output
Receipts & delivery notes
Issued on payment write-off
Numbers always match the contract · no re-typing
Inside the module
Real screens from Flows ERP — what your team will actually work in.
Generating a tax invoice
Pick the contract and the document type — Flows fills your full-form template with the contract's data and assigns the number.
Tax invoice history
Every tax invoice issued, listed with its number and date, ready to open or download.
Why Flows
What makes Flows different
Not another generic ERP — a system built around how Thai SMEs actually buy, sell, and collect.
See how onboarding works →Priced per company, not per seat
One annual price, every module included. Add users freely within your tier — no feature gates, no seat fees.
Three languages with auto-translation
Thai, English & Chinese UI — and the data your team enters is translated automatically, so everyone reads the same records.
Your documents, exactly your format
Send us your invoice and receipt templates; our team configures them into Flows. Every document comes out looking like yours.
We walk you live — and stay
Five-step onboarding at no extra cost, then quarterly system stability reports. We don't disappear after go-live.
Spec sheet
What tax-invoice generation includes — in every plan.
Parties
Seller & buyer names, addresses, tax IDs
VAT
VAT amount calculated automatically
Numbering
Assigned automatically, or entered manually
Templates
Your company's format, set up by the Yangshu team
Languages
Thai · English · Chinese output from one record
Archive
Every record kept in the Document Management module
Frequently asked questions
How do I issue a tax invoice in Flows ERP?
Open the Document Management module, pick the record you're billing, and choose 'tax invoice'. Flows fills in both parties' details and the VAT, and the number is assigned automatically or typed in by you.
Does Flows calculate the 7% VAT automatically?
Flows calculates the VAT for you automatically from the contract's details. The figures on the document therefore always match the contract.
Does Flows support e-Tax Invoice filing with the tax authorities?
e-Tax Invoice filing isn't part of the standard system, but it can be added as custom development.
Can we reprint a tax invoice from last year?
Every issued document is kept in the Document Management module with its number and date. You can open, download, or reprint any past copy, or download several at once.
Can the tax invoice be in other languages?
Yes, tax invoices can be issued in Thai, English, or Chinese. If you need another language, we can add it as custom development.
Issue your next tax invoice from Flows.
Start a free one-month trial, or book a demo and see a full-form tax invoice generated from a real contract.