---
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/posts/tax-summary-webhook-created-at-field-now-returns-utc-timezone
  md: >-
    https://shopify.dev/changelog/posts/tax-summary-webhook-created-at-field-now-returns-utc-timezone.md
metadata:
  effectiveApiVersion: 2026-01
  affectedApi:
    - displayName: Events & webhooks
      handle: webhook
    - displayName: Admin GraphQL API
      handle: admin-graphql
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: Breaking API Change
    handle: breaking-api-change
  indicatesActionRequired: true
  createdAt: '2025-11-19T12:20:10-05:00'
  postedAt: '2025-11-20T12:00:00-05:00'
  updatedAt: '2025-11-20T12:13:38-05:00'
  effectiveAt: '2025-11-20T12:00:00-05:00'
---

November 20, 2025

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

DateNovember 20, 2025

Version[2026-01](https://shopify.dev/changelog?api_version=2026-01)

Flags[Breaking API Change](https://shopify.dev/changelog?filter=breaking-api-change)[Action required](https://shopify.dev/changelog?action_required=true)

SurfacesAPI

Affected APIs[Events & webhooks](https://shopify.dev/changelog?api_type=webhook)[Admin GraphQL API](https://shopify.dev/changelog?api_type=admin-graphql)

## 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": {
    ...
  }
}
```