Amazon.comから下記のようなメールが来ました。

大口出品、または年間50以上の取引がある場合に、Tax IDの登録が必要になるようです。
とりあえずamazon.comにはお試し期間の1ヶ月だけ大口出品者で登録してあったのでメールが来たのかもしれません。まだAmazon輸出には着手できていないので、来月からは小口出品に戻すように設定しました。

Hello XXXXX

In accordance with Amazon policy, you are required to provide tax identity information for your seller account. Your seller account will be suspended if your tax identity information is not provided. Amazon requires tax identity information from the following sellers:
All Professional sellers
Individual sellers that reach 50 transactions in a calendar year, regardless of sales volume
To retain your selling privileges, enter your tax identity information using the short interview process available in your seller account. From the Settings tab, select Account Info and then click Edit in the Legal Entity section. Note that this interview can only be accessed by the primary user of your seller account.

To help protect the security of your tax identity information, do not respond to this e-mail with your tax identity information or share it over the phone.

You are still required to fulfill any orders that are in a shippable status in your seller account. Shippable orders have confirm and cancel buttons in Manage Orders.

If you have provided your tax identity information to Amazon in the last 24 hours, please disregard this message.

Search on “1099k” in seller Help to see answers to frequently asked questions about entering tax identity information and related topics.

Learn more about the regulations and Form 1099-K at the IRS website:

http://www.irs.gov/uac/FAQs-on-New-Payment-Card-Reporting-Requirements

Important Notice: Information in this document does not constitute tax, legal, or other professional advice. To find out how this new legislation will affect your business, or if you have other questions, please contact your tax, legal, or other professional advisor.

Best regards,

Amazon Services