降级/升级以及税务计算服务
注册税务计算服务是可选的，需要加入专业销售计划。变更您对专业销售计划的参与情况可能会影响税务计算服务的注册、设置以及报告可用性。
查看以下情况。
从专业销售账户降级
如果您注册了税务计算服务且降级为个人账户状态，则执行该操作将会取消您的注册。请注意以下事项：
税收文档库中的税务报告将不再可用。在降级之前，生成并下载所有税务报告。
系统会立即移除所有税务计算设置和功能。
要在降级之后重新注册税务计算服务，您必须将账户状态升级为专业销售账户。请参阅以下有关重新升级的信息。
关闭/终止卖家账户
关闭卖家账户是一项永久性操作，您将无法再使用税务计算服务和报告。在关闭账户之前，我们建议您生成并保存税收文档库中可能需要的所有税务报告。
升级至专业销售账户（首次）
升级至专业销售账户后，您可以选择注册税务计算服务。有关信息，请查看税务计算服务条款以及设置税务计算服务。
重新升级至专业销售账户
如果您注册了已使用税务计算服务的专业销售账户，则降级至个人销售账户将会移除所有税务配置。如果您后来升级至专业销售账户，则必须重新配置所有税务配置。有关配置税务设置的说明，请参阅设置税务计算服务。
重要： 之前分配的所有商品级别商品税务代码、默认级别商品税务代码以及管辖设置均需要设置，以确保准确计算。
亚马逊官网原文详情：
Downgrade or upgrade and tax calculation service
Enrolling in the tax calculation service is optional and requires a Professional selling plan. Changes to your participation in a Professional selling plan can affect tax calculation service enrollment, settings, and reporting availability.
Review the following situations.
Downgrading from Professional
If you are enrolled in the tax calculation service and downgrade to an individual account status, this action will cancel your enrollment. Consider the following:
Tax reports in the Tax Document Library will no longer be available. Generate and download all tax reports prior to downgrading.
All tax calculation settings and functionality will be removed immediately.
To re-enroll in tax calculation service after downgrading, you must upgrade your account status to Professional. See information about how to re-upgrade below.
Close and terminate a seller account
Closure of your seller account is a permanent action and you will no longer have access to tax calculations and reporting. Prior to closing your account, we suggest you generate and save any tax reports that you might need from the Tax Document Library.
Upgrading to Professional (first time)
When upgrading to a Professional selling account, you have the option to enroll in the tax calculation service. For information, see Tax Calculation Service Terms and Set up tax calculation services.
Re-Upgrading to Professional
If you were enrolled in a Professional selling account that used the tax calculation service, downgrading to an Individual selling account will remove all tax configurations. You will need to reconfigure all tax configurations if you upgrade to a professional selling account. For instructions about configuring tax settings, see Set up tax calculation services.
Important: One or more of the previous item level product tax code assignments, default level product tax code assignment, and jurisdiction settings will require set up to ensure accurate calculations.
文章来源：亚马逊官方网站
