A referendum on stamp duty was held in Switzerland on 13 May 1917.[1] Voters were asked whether they approved of amending articles 41bis and 42 lit d of the constitution, which covered stamp duty.[1] The proposal was approved by a majority of voters and cantons.[1]
The referendum was a mandatory referendum,[1] which required a double majority; a majority of the popular vote and majority of the cantons.[2] The decision of each canton was based on the vote in that canton.[2] Full cantons counted as one vote, whilst half cantons counted as half.[2]