Hello, I'm kind of a new here, but I today I won a $100 virtual Mastercard from the Citi Bank Dive into the Digital instant win game. They sent me an email to verify my eligiblity by filling out a IRS W-9 form. Has anyone have to fill out a W-9 before? Is it legit if its asking for this info? I would have to fill in my social security. Thank you in advance 
curmudgeon gives good [as always!] advice here;
here;
and here;
ALSO [ty kdh58!] be aware:
And from lk107 [ty!]:

curmudgeon gives good [as always!] advice here;
The threshold for IRS mandatory reporting is $600 & above. For amounts of $599 and below reporting is not required. Some firms prefer to collect the info regardless, that way, they're covered when they take a tax deduction. Like Amy said, ALL sweepstakes winnings are taxable and you're required to report them and pay taxes on them regardless of the dollar amount. Most of us ignore this requirement for wins of $599 or less, since there is usually no 1099 issued. If you're audited & caught you'll be required to pay taxes and penalties on the amount ($200) not reported.
here;
Sponsors of Promotion Games of Chance offering and awarding prizes valued at $600 or more should be aware that they are responsible to obtain a signed, legible copy of an IRS form W-9 from every winner that they issue a prize to. This means that any eligible entrant who has been verified as a prize Winner you issue a prize of $600 or more to, will need to fill out a W-9 form for you to keep on record, regardless of the number of times in the course of a tax year the same person wins a prize. In addition, if one person wins multiple lower valued prizes within the same year, which when added together total $600 or more, they too will be required to complete a form W-9.
The above is from Marden-Kane Digital Promotions. There's more & you can find the full article at: Sweepstakes Winners: W-9's and 1099's - Marden-Kane
and here;
You should also know about quarterly estimated tax payments. If your sweepstakes win is large enough, you may be required to pay an early tax payment (you can't wait till April) or pay a penalty. If you won a $25,000 car, this tax provision would probably apply. You'll find more info here: https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
ALSO [ty kdh58!] be aware:
Some companies want your SS# for tax purposes even if the prize you've just won is less than $600, in case you win another prize from them during the same calendar year, and when combined those prizes are over $600. So they are just coverig their bases.
And from lk107 [ty!]:
Congratulations on your win!
Yes, this is legit. It is not uncommon for sweepstakes sponsors to ask for this kind of information for tax purposes; usually this is done with bigger prizes but some sponsors do it for smaller prizes as well. If you feel unsure or uncomfortable, you can also ask the sponsor about giving this information.
The 2 articles linked below will provide you with more information about this.
5 Weird Things that Aren't Signs of Sweepstakes Scams
and
Why Sweepstakes Need Winners' Social Security Numbers
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