Under the Contract Labour (Central) Rules, 1971: (1) Contractors must file a half-yearly return in Form VI-B with the Licensing Officer — due by 30 September for the April–September period, and by 31 March for the October–March period; (2) Principal Employers must file an annual return in Form XXIV with the Registering Officer, due by 15 February each year for the preceding calendar year. For establishments covered under state-specific CLRA rules — which most private sector establishments are — the due dates and formats may differ from the Central Rules. For example, several states require contractors to file returns in different formats with state Labour Departments. Futurex tracks all applicable state-level return schedules to ensure no filing is missed.