请问HN：双边市场的美国销售税合规成本是多少？
我正在为一家仅在美国运营的初创公司提供咨询，该公司大约有2000名卖家。我们尚未在网站上处理支付，因为我们担心无法遵守销售税规定。但现在我们正在考虑迎接这个挑战。
假设我们向所有州销售，且我们的交易量将达到1000万美元，计算、收取和向相关州、县和城市上缴销售税的成本会是多少？
还假设我们只销售一种类型的产品（即我们是一个专业市场，而不是一个综合市场）。
将成本分为设置成本和经常性成本可能是值得的。
是否会有意外情况出现？在工具或供应商方面有什么建议吗？
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I'm consulting for a US-only startup that has approximately 2000 sellers. We don't yet facilitate payments on site because we are worried about not being sales tax compliant. But now we're thinking about biting the bullet.<p>Assuming we sell into all states and that our transaction volume will reach $10 million USD, what would be the cost of calculating, collecting, and remitting sales tax to the relevant states, counties, and cities?<p>Assume too that we only sell one type of product (i.e. we are a specialist marketplace not a general one).<p>It might be worth separating into setup and recurring costs.<p>Any surprises in store? Or recommendations in terms of tooling or vendors?