---
title: Tax summary webhook created_at field now returns UTC timezone - Shopify developer changelog
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/tax-summary-webhook-created-at-field-now-returns-utc-timezone
  md: https://shopify.dev/changelog/tax-summary-webhook-created-at-field-now-returns-utc-timezone.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

November 20, 2025

Tags:

* Action Required
* Webhook
* Admin GraphQL API
* 2026-01

# Tax summary webhook `created_at` field now returns UTC timezone

## What's new

The `created_at` field from `tax_summaries/create` webhook for tax partners will now return timestamps in UTC format with the `Z` suffix, including millisecond precision.

## Action required

Update your parsing logic to handle the new format. The following are examples of the format prior to and after the change:

Versions prior to `2026-01`:

```json
{
  "id": 14,
  "shop_id": 1,
  "order_id": 7,
  "created_at": "2025-11-19T08:16:53-05:00",
  "summary": {
    ...
  }
}
```

Versions `2026-01` and higher.

```json
{
  "id": 14,
  "shop_id": 1,
  "order_id": 7,
  "created_at": "2025-11-19T13:16:53.784Z",
  "summary": {
    ...
  }
}
```