Businesses:

Preparation of business tax returns:
This includes: C-Corporations, S-Corporations, LLCs, Partnerships, & Sole Proprietors
Payroll tax returns: Federal & State
Unsecured Property Taxes (571-L)
Sales taxes

Individuals:

Preparation of individual tax returns:
Personal 1040 (no matter how small or complicated)
Gift tax returns 709

Estates & Trusts:

Preparation of Estate and Trust income tax returns:
706 & 1041