ITSS (Irish Taxation Software Services) are a dynamic team of Chartered Tax Consultants and Software Developers that have been developing Ireland’s market leading tax software for many years. ITSS is 100% Irish owned company. As a Business Partner of Sage we design, develop and support the Sage Personal and Corporation Tax Compliance Software from our Cork office. Current clients include all Top 4 Accountancy firms and a variety of large, medium and small firms.