Answer:
1. A position will be reasonable if the position has substantial authority, even if it is not disclosed.
2. For tax shelters, a position is treated as unreasonable unless it is reasonable to believe that the position has A more likely than not chance of being sustained.
3. A return preparer may not adopt a position without Substantial Authority for the position.
4. In order to avoid penalties with a disclosed position, the tax preparer must believe that the position has A Reasonable Basis of being sustained.
5. A Frivolous Return omits information necessary to determine the taxpayer's tax liability or is based upon the taxpayer's desire to impede the collection of tax.
6. Aiding & Abetting is a willful attempt to evade federal tax liability, even that of another person, and is subject to criminal penalties, including imprisonment.
Step-by-step explanation: