Self-assessment contribution form for gig worker aggregators requires turnover details, payment basis, and truthful declaration. Prescribes Form XX for self-assessment of contribution by aggregators of gig workers or platform workers, to be submitted by 30 June of the relevant year in which the contribution is payable. The form requires particulars of the aggregator, authorised person, number of engaged workers, annual turnover, the applicable provisional contribution basis, amount payable, payment details, and remarks, if any. It also provides that annual turnover excludes tax, levy, and cess paid or payable to the Central Government, and requires a declaration of truth and completeness.