Tax Basics for Startups

Per Diem Rates from the U.S. General Services Administration

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Rates are set by fiscal year, effective October 1 each year. Find current rates in the continental United States ("CONUS Rates").

C corporation vs S corporation


A corporation is a separate legal entity, separate and apart from its owners (called shareholders or stockholders). The C and S are sections of Internal Revenue Code (Title 26 of the U.S Code) governing federal tax treatment.

A C corporation is created under state law; an S corporation is not created under state law, it is created by filing Form 2553, Election by a Small Business Corporation with the IRS to be treated under the rules of IRC subchapter S.

While a C corporation or LLC may elect to be treated an S corporation for federal tax purposes, making this election does not change the legal status of these entities. A C corporation remains subject to the corporation laws of the state of incorporation and an LLC remains subject to the LLC laws of the state of formation.

A C corporation is not a pass-through entity; it reports income and loss on Form 1120, U.S. Corporation Income Tax Return and is subject to taxes at the entity level. A C corporation does not pass losses through the entity to its shareholders.

An S corporation reports income and loss on Form 1120-S, U.S. Income Tax Return for an S Corporation. Items of income, deductions, gains, losses and credits flow through the entity to its shareholders; it does not pay taxes at the entity level (with some exceptions).

S corporation shareholders receive Schedule K-1 annually which reports their share of the entity's income, deductions, gains, losses and credits. Shareholders use K-1 as the basis for reporting their share of these items on their personal tax returns.

C corporations distribute profits to shareholders, called dividends. Undistributed C corporation profits remain in the corporation in an equity account called Retained Earnings.

Legal Attributes of a Corporation

The following legal attributes apply to a corporation:
  1. It is a separate legal entity, separate and apart from its owner(s). In a widely quoted definition, Chief Justice John Marshall in 1819 described a corporation as an artificial being, invisible, intangible, and existing only in the contemplation of the law.
  2. It provides shareholders limited liability from corporate debts. This is one of the most important reasons for incorporating.
  3. It is formed under state or federal law or the laws of other countries. A corporate charter is obtained from one of the fifty states.
  4. Shares of stock may be transferred freely provided there are no restrictions.
  5. It has continuity of life. If a shareholder dies or sells his shares, the corporation continues doing business as usual.
  6. It can buy, sell, and own property in its own name.
  7. It can enter into contracts with others.
  8. It can sue and be sued in its own name.
  9. It can be a partner in another business.
  10. Its name is signed by corporate seal.

Tax Identification Numbers For a Corporation

Employer Identification Number (EIN):

A corporation must have an EIN. The IRS issues it. The number is used to identify the corporation on tax documents.

State Withholding Number:

For state purposes, the corporation will need a state withholding number. Some states, such as Nevada, don't have a personal income tax. Check your state.

State Account Number:

This is for state unemployment tax (SUTA) reporting. Generally, states, such as Arizona, assign each employer an account number.

Avoid costly penalties!

Use the IRS Online Tax Calendar
to check filing and deposit deadlines.