Assembly members agreed to accept a Westminster bill to enable charities and Community Amateur Sports Clubs (CASCs) to claim a gift aid-style payment on small cash donations of up to £20, on 20 November 2012.
Social Development Minister Nelson McCausland tabled the legislative consent motion on the Small Charitable Donations Bill.
The bill would introduce the Gift Aid Small Donations Scheme, which was announced in the 2011 Westminster Budget.
The purpose of the scheme was to enable gift aid-style payments where it was often difficult to obtain a declaration.
In general, eligible charities and CASCs would be able to claim top-up payments on up to £5,000 of small donations each year.
The Assembly's approval gave consent to the provisions contained within the bill. It also allowed the Westminster Parliament to proceed.
Social Development chairman Alex Maskey said 6,000 organisations in Northern Ireland would benefit.