Caissa LLP is a full service accounting firm. The strength of our service and commitment to our clients have led us to become ... a firm serving the needs of clients on a local, national and international basis. Caissa LLP has offices in Guelph and Cambridge with over 50 staff members. The firm assists and works with many clients to achieve their financial, business planning and compliance filing requirements. Between owner/manager and not-for-profit organizations, the firm provides audit, assurance, compilation, tax and business advisory service read more