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Is this formula accurate for weighing the difference between an S-Corp and LLC?
FICA/SE taxes are not 30%. They are at most ~15%, including the employer portion. Employer also pays FUTA tax, and has additional payroll expenses (like fees and worker compensation insurance). The employee's FICA portion is limited up to a certain level of earnings (110100 this year, IIRC). Above it you only pay medicare taxes, not social security. S-Corp earnings are not taxed at 15%, these are not dividends. They're taxed at your ordinary income rate. You don't pay SE taxes on it, that's the only difference. I hope you're talking about tax treatment decision, because there are entirely different factors to keep in mind when you're organizing a business and making a decision between being it a LLC or a corporation. I believe you should pay some money to get a real advice that would apply to you, from a EA/CPA who would be doing the number-crunching (hopefully correctly). I'm a tax practitioner, and this answer was not intended or written to be used, and it cannot be used by any taxpayer, for the purpose of avoiding penalties that may be imposed on the taxpayer.