Membership of ITSA is open to legally-incorporated companies and businesses (but not to individuals or trade or industry associations) that are suppliers of:
- Components and features,
- Finished tax stamps,
- Equipment for the design, manufacture, application and authentication of tax stamps or
- Systems for coding and marking tax stamps.
All new members must have a legitimate and established interest and business in tax stamps, and must provide evidence of this interest when submitting their application. All members must also agree to abide by the Code of Conduct.
Founded by leading tax stamp suppliers, ITSA welcomes any company – providing it meets the conditions for membership – willing to contribute to achieve the goals of the association.