1917 Swiss stamp duty referendum|
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    Choice   |  Votes  |  %  |      Yes  |  190,288  |  53.16%  |       No  |  167,689  |  46.84%  |       | Valid votes  |  357,977  |  95.19%  |    | Invalid or blank votes  |  18,086  |  4.81%  |    | Total votes  |  376,063  |  100.00%  |    | Registered voters/turnout  |  894,177  |  42.06%  |    | 
 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] 
 Background
 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] 
 Results
   | Choice  |  Popular vote  |  Cantons  | 
  | Votes  |  %  |  Full  |  Half  |  Total  | 
  | For |  190,288 |  53.2 |  14 |  1 |  14.5  | 
  | Against |  167,689 |  46.8 |  5 |  5 |  7.5  | 
  | Blank votes |  11,994 |  – |  – |  – |  –  | 
  | Invalid votes |  6,092 |  – |  – |  – |  –  | 
  | Total |  376,063 |  100 |  19 |  6 |  22  | 
  | Registered voters/turnout |  894,177 |  42.1 |  – |  – |  –  | 
  | Source: Nohlen & Stöver  | 
 References
   - ^ a b c d Nohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p1907 ISBN 9783832956097 
  - ^ a b c Nohlen & Stöver, p1891