Guam "corporation", "incorporated", "company", or "limited", or the abbreviation "corp.", "inc.", "co.", or "ltd.", or words or abbreviations of like import in another language; if the word "company" or its abbreviation is used, it shall not be immediately preceded by the word "and" or an abbreviation or symbol representing the word "and." Title 18, § 2110, Guam Code Annotated
LLC members are taxed on their personal tax returns. The LLC itself is not taxed. S-Corp shareholders are taxed on their personal tax returns. The company itself is not taxed. C-Corps are taxed both at the corporate level and again on shareholders' individual returns. Non-Profits are taxed on a corporate level but may also enjoy a host of tax-exempt benefits. Sole Proprietorships are taxed only on their owner's tax return.
Where the equipment you use in your business was acquired as a gift, you may report your estimate of its current market value on the Business Property Statement (that is, what you think it would sell for in the open market place). Enter that estimated value in the most current year's cost line and add a note indicating that the entry is an estimate.