In Arizona, the "single member" of an LLC can be a married couple whose LLC interest is community property.
When it comes to taxation, a single-member LLC is generally considered a “disregarded” entity that, by default, is taxed as a sole proprietorship. In most cases, the member of a single-member LLC simply reports the LLC’s profits or losses on their personal tax return, and the LLC does not have to file a separate tax return.
In contrast, a multi-member LLC is, by default, taxed as a partnership and must file an informational tax return to allow the IRS to confirm that the individual members are correctly reporting their income. The LLC must also provide each member with a Schedule K-1 that reports their share of the LLC’s profits and losses for reporting on their personal returns.