The two federal rules that drive this
Section 7216 rules decide when you need a client’s consent to share return information; 26 CFR 301.7216-2(d)(1) allows disclosure to another preparer only if that preparer is in the United States. The FTC Safeguards Rule decides how you oversee the provider: 16 CFR 314.4(f) requires you to select capable providers, require safeguards by contract, and assess them periodically.