Received Est. Tax Form 1040-ES For First Time

[Zele]

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OP stated he was now "playing as sole source of income" and asked about "gambler" filings. I'm betting he will get the pleasure of paying SE tax which will probably put him over 20%.

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That's part of my point. No one has really tested whether the IRS can make you file as a professional gambler, even if it is your sole source of income. They probably can, but nobody really knows yet.