VAT number

Background

When setting up a new AWS account it's important that you make sure that the VAT number is configured.
If you do not enter the VAT number, Amazon will automatically bill you an extra 25%.

How do I add or update my tax registration number (for example, a TRN, VAT number, VAT ID, GSTIN, or VAT registration number) or business legal address on my account?

Short Description

If you have a tax registration number (TRN), such as a VAT ID, you can update the TRN and associated business legal address connected with your account in the Billing and Cost Management console on the Tax Settings page. If you're signed in as the master account of an organization, you can also view and edit the tax registration numbers for all linked accounts.
When updating your TRN or business legal address, note the following:
  1. If you don't have a TRN, or your country isn't available in Tax Settings, AWS uses the address associated with the account's default payment method, the account's billing address, and the account's contact address to determine the account's tax jurisdiction.
  2. If you're not sure which country to choose for these fields, consult your tax advisor.
  3. If you're in Europe and receive special status or relief from VAT, contact AWS Support and attach applicable certificates issued by the tax authorities in your country. If you don't have a certificate, provide information about your special status or relief in your case, and include specific sections of tax legislation that are applicable to your organization.
  4. If you're in the United States, see Does AWS charge US sales tax?

Resolution

To add the tax registration number or business legal address for your account
  1. Sign in to your account, and then open the Billing and Cost Management console.
  2. From the navigation pane, choose Tax Settings.
  3. Open Manage Tax Registration, and then choose Add.
  4. Select the country from the Country drop-down menu.
  5. Enter the remainder of the fields, and then choose Update. Note: The country associated with your tax identification number and the country associated with your business legal address must match.
To edit or update the Tax Registration Number or Business Legal Address for your account
  1. Sign in to your account and open the Billing and Cost Management console.
  2. From the navigation pane, choose Tax Settings.
  3. Open Manage Tax Registration, and then choose Edit. Note: If you're signed in as the master account of an organization, you can edit the TRN and associated business legal address of multiple accounts in the consolidated billing family at the same time. Check the box next to each account in the consolidated billing family you want to update, open Manage Tax Registration, and then choose Edit. Bulk editing is available for all accounts except those in China.
  4. From the Country drop-down menu, choose the country where your account resides for tax purposes.
  5. Enter the remainder of the fields, and then choose Update. Note: The country associated with your tax identification number and the country associated with your business legal address must match.
Your tax registration numbers are reviewed by AWS before they are applied to your account.
For more information about tax and AWS, see AWS Tax Help.
Source: https://aws.amazon.com/premiumsupport/knowledge-center/update-tax-registration-number/