Protax-ovi klijenti u pogledu poreskih programa sponzorisanih od strane poslodavaca ili individualnih angažmana, uključuju zaposlene u sledećim kompanijama:
- Adobe sistemi uključeni
- All Bright Professional Cleaning Services Inc.
- americki ekspres
- American Management Systems
- Analytica Group
- Arnold i Porter LLP
- Bain i kompanija
- Bank of America
- BEA Systems Inc.
- Bear, Stearns & Company Inc.
- Bristol-Myers Squibb
- CIBC Worldmarkets
- CIGNA Systems
- Citi Group/ Salomon Smith Barney
- Cleary Gottlieb Steen & Hamilton LLP
- Coherent Inc.
- Compass Advisers, LLP
- Cravath, Swaine & Moore LLP
- Credit Suisse First Boston
- Davis Polk & Wardwell LLP
- Debevoise & Plimpton LLP
- Deloitte & Touche LLP
- Deutsche Bank Securities Inc.
- DoubleClick Inc.
- Ernst & Young LLP
- Estee Lauder Inc.
- Experian Inc.
- Gartner Inc.
- Goldman Sachs & Co.
- Gotham Construction
- JP Morgan Chase & Co.
- LeBouef Lamb Green & Macrae LLP
- Lehman Brothers
- L'Oreal- Le Club des Createurs de Beaute USA, LLC.
- Lucent Technologies
- Merrill Lynch
- Medicinski centar Montifiore
- Morgan Stanley
- Paul Weiss Rifkind Wharton Garrison LLP
- Proskauer Rose LLP
- Prudential Securities Inc.
- Sidley Austin Brown & Wood LLP
- Skadden Arps Slate Meagher & Flom LLP
- Sullivan & Cromwell LLP
- UBS Warburg LLC
- Kompanija za obogaćivanje Sjedinjenih Država (USEC Inc.)
- Warner Brothers
- White & Case LLP