Tax US Corporation / LLC

Single Member LLC
More often than not, when and LLC has only one member, the fact that it is an LLC is ignored for the purpose of filing a federal tax return (Treasury Regulations Section 301.7701-1,-2,-3)
Multi Member LLC

Many LLCs with more than one member file a partnership return. You can also file as a corporation, using a different form.

Corporations
C Corporations are taxed at rates ranging from 15 to 38 percent, based on taxable income. In addition to income taxes, corporations will more than likely have to pay some, if not all, of the following additional federal taxes:

– Self-employment Tax
– Federal withholding Tax
– Social Security and Medicare withholding Tax
– Federal Unemployment Tax
– Excise Tax

Corporations that expect to owe more than $500 in a given tax year are required to file and pay estimated tax no later than the 15th day of the 4th, 6th, 9th, and 12th months of their tax year. Your taxable income is calculated by subtracting deductions from income. The remainder is taxed according to the IRS rate schedule, and an Alternative Minimum Tax applies.