The law specifies that all taxable personal property must be assessed as of a specific point in time, and that point is precisely at 12:01 a.m. January 1 (regardless of what transpires after that date). Even if closed shortly after the lien date, a business must still file a Business Property Statement and pay taxes for the coming fiscal year on any taxable property they owned on the lien date.
For businesses in industries like construction or real estate, where unforeseen circumstances and hazardous conditions may hold the owner responsible, consider starting an LLC. The protection gained means you will not be held personally liable, protecting you and your family from litigation or the debts of the business. An LLC may not be the best choice for business owners who plan on raising capital through outside investment. LLCs are not public structures and do not have shareholders, so taking a company public is not an option either. However, in the event that you'd like to take your business public you may switch to a public legal structure, like a C corporation, later on.
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