The campaign is the period when the political parties put forward their candidates and arguments with which they hope to persuade people to vote for their candidates and parties. Candidates are given a week to put forward their nominations. These are scrutinised by the Returning Officers and if not found to be in order can be rejected after a summary hearing. Validly nominated candidates can withdraw within two days after nominations have been scrutinised. The official campaign lasts at least two weeks from the drawing up of the list of nominated candidates, and officially ends 48 hours before polling closes.

There are tight legal limits on the amount of money a candidate can spend during the election campaign. In most Lok Sabha constituencies the limit as recently amended in December, 1997 is Rs 15,00,000/-, although in some States the limit is Rs 6,00,000/- (for Vidhan Sabha elections the highest limit is Rs 6,00,000/-, the lowest Rs 3,00,000/-). Although supporters of a candidate can spend as much as they like to help out with a campaign, they have to get written permission of the candidate, and whilst parties are allowed to spend as much money on campaigns as they want, recent Supreme Court judgements have said that, unless a political party can specifically account for money spent during the campaign, it will consider any activities as being funded by the candidates and counting towards their election expenses. The accountability imposed on the candidates and parties has curtailed some of the more extravagant campaigning that was previously a part of Indian elections.