The following is KDP help, but has been newly added。
Taxpayer ID submission process
1. Tax interview
Using a simple online tax interview accessible from your KDP account page、You need to submit tax information to Amazon。Publisher、Follow the steps provided in the interview to gather all the information needed to set up tax identification.、Generates Form W-9 for US publishers or Form W-8BEN for non-US publishers。
2. Verification of taxpayer ID
Information about taxes including US TINs、Must be verified by the US Internal Revenue Service (IRS)。This process、May be delayed by stopping the IRS database。further、For TINs that have not been registered in the IRS database since they were issued,、Verification may take up to 6 weeks。
3. Account status for taxes
If you see a Completed status in the Tax Information section of your KDP account page、Publishers can sell books on Amazon。If you cannot verify your taxpayer ID because it does not match the IRS record、Tax status updated、Indicates that more information is needed。
I got this reply from Amazon。
On Amazon、To comply with US tax filing regulations、For all publishers、You will be asked to provide valid taxpayer information online。
Even if you have already sent W-8BEN、To reflect detailed information to the account、I would like you to complete the procedure again.。
We apologize for the trouble when you are busy.、Thank you for your cooperation.。
To enter taxpayer information、Follow the steps below。
1. http://at kdp.amazon.co.jp/、Log in to your KDP account。
2. Click "(your name) account" in the upper right corner of the page。
3. Scroll to the Taxpayer Information section。
4. Click the "Detailed input of taxpayer information" button。
A brief tax interview will be conducted online。If you enter according to the procedure、Not only do you know the required tax return、You can enter all the details needed to update your account。When this is done、You will be able to see your submission status in the "taxpayer information" section of your KDP account page。
*For W-8BEN generation、Please enter the information in "English"。
* If you agree to the electronic signature in "Agree to electronic signature" in "Interview on KDP tax"、After that, when you proceed with the interview, you will be asked to type your signature with the keyboard on the page "Authentication"。
(No need to mail W-8BEN)
For Amazon tax requirements and policies、Please see the following page。
https://kdp.amazon.co.jp/self-publishing/help?topicId = 200641090