You need to complete a W-9 form in order to sell past $600.

[ninjass998]

Selling idle items on second-hand trading platforms requires filling in W-9

You need to fill out a W-9 form to sell items over $600. How to fill in this?

[KrisD15]

Form W-9 is submitted to the company that is handling the transactions and paying you. 

It gives them the information they need to issue Form 1099-K (or 1099-MISC or 1099-NEC) to you for the tax year. 

You can print a W-9 and fill it out. 

If you are an individual, you won't have an EIN (Employer Identification Number), so will need to report your Social Security number to them (or file as a Self-Employed Taxpayer / Sole Proprietor and get an EIN for security reasons) 

W-9

Apply for EIN 

[ninjass998]

I am self employed. Is it possible to submit W-9 online

[ninjass998]

I am self employed. How to file W-9 online

[MarilynG1]

Contact the company you need to submit the W-9 to to see how they want it submitted.  They may have a online link for you to use.

@ninjass998 

[ninjass998]

Yes when I received this letter there was a link attached.
You need to submit your name, address, SSN/itin. and then choose to submit online or by mail.
Can I just submit it like this?

[HollyP]

It's best to verify with the company asking for the W-9. TurboTax doesn't include the W-9, as it isn't filed with the IRS. Just download it from the IRS website, print it out, complete it, and then give it to whomever asked you to fill out a W-9.