# Add HST number to invoices

**URL:** https://www.protaxcommunity.com/t/add-hst-number-to-invoices/11061
**Category:** Tax Topics
**Created:** [July 10, 2025, 11:23am UTC](https://www.protaxcommunity.com/t/add-hst-number-to-invoices/11061 "2025-07-10T11:23:03Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![kevin1](https://avatars.discourse-cdn.com/v4/letter/k/a9adbd/32.png) [@kevin1](https://www.protaxcommunity.com/u/kevin1)
#### Post date: [July 10, 2025, 11:23am UTC](https://www.protaxcommunity.com/t/add-hst-number-to-invoices/11061/1 "2025-07-10T11:23:03Z")

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How do I add the business HSt number to the client invoices? I cannot find a field within the Letterhead section to add it.

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### Author: ![kevin](https://avatars.discourse-cdn.com/v4/letter/k/2acd7d/32.png) [@kevin](https://www.protaxcommunity.com/u/kevin)
#### Post date: [July 10, 2025, 5:23pm UTC](https://www.protaxcommunity.com/t/add-hst-number-to-invoices/11061/2 "2025-07-10T17:23:29Z")

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Does it show up on the “Billing” worksheet (in the “Registration details” field")?

It’s likely on any of the invoicing templates but I have the following code at the bottom of my invoice.

{{# CurrentClient.BillingWorksheet.Totals.RegistrationDetails }}{{ CurrentClient.BillingWorksheet.Totals.RegistrationDetails}}{{/ CurrentClient.BillingWorksheet.Totals.RegistrationDetails}}

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<div class="post-metadata">

### Author: ![sarka](https://sea2.discourse-cdn.com/flex016/user_avatar/www.protaxcommunity.com/sarka/32/2667_2.png) [@sarka](https://www.protaxcommunity.com/u/sarka)
#### Post date: [July 10, 2025, 5:52pm UTC](https://www.protaxcommunity.com/t/add-hst-number-to-invoices/11061/3 "2025-07-10T17:52:51Z")

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In your Options Profile, go to return Preparation \> Invoicing and enter your tax ID here:

 ![image](https://us1.discourse-cdn.com/flex016/uploads/taxcycle/original/2X/9/92b1731c89194a463722c3bdfd7c7825e88ed0c3.png)

This populates the Registration details on the Billing Worksheet which is included on the Invoice template.

 ![image](https://us1.discourse-cdn.com/flex016/uploads/taxcycle/original/2X/e/eec58b233d978ad9743192514884f1cbceb17445.png)

You can use the code @kevin posted to add it to your letterhead or simplify it to {{# CurrentClient.BillingWorksheet.Totals.RegistrationDetails }}{{ . }}{{/ CurrentClient.BillingWorksheet.Totals.RegistrationDetails}}