> ## Documentation Index
> Fetch the complete documentation index at: https://docs.jingjaiops.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Thai Tax Invoice (ใบกำกับภาษี)

> When and how to issue a Thai Tax Invoice, the required fields, and the PDF format.

A **Tax Invoice** (Thai: **ใบกำกับภาษี**) is the legally required document for VAT-registered customers in Thailand. JingjaiOps generates Tax Invoices that comply with Thai Revenue Department requirements.

## When to issue a Tax Invoice

Issue a Tax Invoice when **all** of these are true:

1. Your business is VAT-registered (you have a Thai VAT registration number)
2. The customer is also VAT-registered (you have their 13-digit Tax ID)
3. The transaction is subject to VAT (rentals are; pure deposits are not)

If the customer is an individual or a non-VAT-registered business, you don't need a Tax Invoice — a regular invoice is fine. But many customers will ask for one regardless, and there's no harm in issuing it.

## Generating a Tax Invoice

A Tax Invoice can be issued from any **Sent**, **Partial**, or **Paid** invoice:

<Steps>
  <Step title="Open the invoice">
    From the Invoices list.
  </Step>

  <Step title="Click 'Issue Tax Invoice'">
    Top right, in the actions menu.
  </Step>

  <Step title="Confirm the customer's tax details">
    JingjaiOps shows the customer's Tax ID, registered name, and registered address. If anything is missing, you'll be prompted to add it.
  </Step>

  <Step title="Confirm your business tax details">
    Your business name, Tax ID, and registered address — pulled from Settings.
  </Step>

  <Step title="Generate">
    A Tax Invoice PDF is generated with its own number (`TI-YYYY-NNNN`).
  </Step>
</Steps>

The Tax Invoice is linked to the original invoice. You can find it on the invoice's **Documents** tab.

## Required fields

Thai law requires every Tax Invoice to include:

| Field                                                | Source                         |
| ---------------------------------------------------- | ------------------------------ |
| **Word "ใบกำกับภาษี" or "Tax Invoice"** prominently  | Always shown                   |
| **Seller name and address**                          | Settings → Business Settings   |
| **Seller VAT registration number** (13-digit Tax ID) | Settings → Business Settings   |
| **Buyer name and address**                           | Customer profile               |
| **Buyer VAT registration number** (13-digit Tax ID)  | Customer profile               |
| **Branch identifier** (head office or branch number) | Customer profile               |
| **Tax Invoice number and date**                      | Auto-assigned (`TI-YYYY-NNNN`) |
| **Description of goods/services**                    | Invoice line items             |
| **Quantity, unit price, total**                      | Invoice line items             |
| **Amount excluding VAT**                             | Calculated                     |
| **VAT amount (7%)**                                  | Calculated                     |
| **Total including VAT**                              | Calculated                     |

If any required field is missing, JingjaiOps stops you and asks for it before generating.

## PDF format

The Thai Tax Invoice PDF uses the standard Thai format:

* Header: **"ใบกำกับภาษี / Tax Invoice"** in large type
* Below the header: **"ต้นฉบับ"** (Original) on the original copy, **"สำเนา"** (Copy) on duplicates
* Seller block at the top
* Buyer block on the right
* Tax Invoice number, date (Buddhist calendar), reference invoice number
* Line items table
* VAT calculation block
* "Total amount in words" line in Thai (read out the grand total in words)
* Authorized signature line

The PDF is bilingual in headings (Thai primary, English secondary) but customer-facing text is in the language of the customer's preference.

## Multiple copies

When a Tax Invoice is generated, JingjaiOps creates two PDFs:

* **Original (ต้นฉบับ)** — for the customer
* **Copy (สำเนา)** — for your records

Both are stored on the invoice's Documents tab. You only send the Original to the customer; keep the Copy for tax filings.

## Voiding a Tax Invoice

If a Tax Invoice is issued in error or the underlying invoice is voided, you must void the Tax Invoice as well:

<Steps>
  <Step title="Open the Tax Invoice">
    From the original invoice's Documents tab.
  </Step>

  <Step title="Click 'Void'">
    A reason field is required.
  </Step>

  <Step title="Issue a credit note (if needed)">
    For a partial credit, generate a `CN-YYYY-NNNN` credit note instead of voiding.
  </Step>
</Steps>

Voided Tax Invoices are kept in the archive — Thai law requires you to retain them, including the void reason.

<Tip>
  For invoices that span pre-payment and final settlement, talk to your accountant about whether to issue Tax Invoices per payment or once at the end. JingjaiOps supports both approaches.
</Tip>