NOT capital gains tax.
That would require data on cost of item when obtained & sales price AND LENGTH OF TIME-—Over or under a year for short term or long term capital gains.
Capital Gains is entirely Another kettle of fish.
IF IRS wants the cash transacted to be reported to the IRS by PAYPAL, etc, then PAYPAL,etc NEEDS SOC SEC NUMBER, etc.
I have filled out 1099’s for over 58 years.
I couldn’t even guess how many.
When I did books for small businesses and a 1099 was called for, AND the recipient refused to give me Soc Sec number, etc., I would type up a 1099 with the information I DID HAVE and where the box was for SS NUMBER-—I would write REFUSED.
At least MY client who had paid the $$$$$ was legally filing the 1099, no penalty for him.
Does PAYPAL also transfer money-—just like Western Union? NO “SALES” involved???
I also kept track of the multiple times I tried to get the SS numbers I needed.