LLCs are typically taxed on a pass through basis, much like general partnerships. As pass through entities, the profits and losses of LLCs are passed on to the individual owners and are reflected on the owner’s personal income tax returns. Alternatively, LLCS may elect to be taxed as S corporations to potentially reduce the self-employment taxes imposed on the owners.
Since limited liability companies can be a pass-through entity, owners are taxed on their personal income. S-Corp shareholders are taxed personally. The S-Corp, however, is not. C-Corp income is taxed at the corporate level first, then again at the personal level. This is called "double taxation." Non-Profits are only taxed once and can write off most of their expenses. Sole Proprietors are taxed only on their personal tax return.
On the other hand, if you are not responsible for its tax, then you should declare the equipment in Part III of the Business Property Statement (Equipment belonging to others). Where equipment is declared in Part III of the Business Property Statement, the Assessor will also send a Notice to File to the person reported as the equipment's actual owner.