"PayPal will track the payment volume of your account(s) to check whether your payment volume exceeds both of these levels in a calendar year: $20,000 USD in gross payment volume from sales of goods or services in a single calendar year 200 payments for goods or services in the same year* If you cross the IRS thresholds in a given calendar year, PayPal will send Form 1099K to you and the IRS for that year early in the following year." - https://www.paypal.com/us/selfhelp/article/how-does-paypal-report-my-sales-to-the-irs-will-i-receive-a-1099-tax-statement-faq729 As mentioned above, a seller is reported to IRS only if both above conditions are met in a calander year. So for this,the gross payment volume of 20,000$ will be calculated only for a calendar year according to the above statement. So let's say a seller has got paid 20,000$ in TWO years time (this would be from his first sale) and in the first year alone he recived more than 200 payments, would he be reported to IRS?
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