Dasvandh (, also translated as 'tithe', alternatively spelt as daswandh) is the one tenth part (or 10%) of one's income that one should donate, both financially (as a tithe) and directly in the form of seva, according to Sikh principles.
Overview
It falls into Guru Nanak Dev's concepts of Vand Chhako and Kirat karo. The practice was followed during the period of Guru Arjan Dev and many Sikhs still continue to carry out the practice in the present-day.
History
The practice of charitable giving was preached and spread by Guru Amar Das, followed by Guru Ram Das, and by Guru Arjan. During the guruship of Guru Amar Das, an authorized institution for managing and spreading the Sikh religion was developed in order to show directions to the Sikhs by preaching them the teachings of Sikh gurus. The Masands (ministers and the tithe-collectors) had the responsibility of collecting "kar bhet" (seva offerings) and dasvandh donations from the Sikhs in the region they were stationed in, and to then ensure these were in-turn given to the Guru.