Why would a state require citizens to register before voting? Why not just allow citizens to vote using their ID card on the day of voting?

  • 2
    In Switzerland, there is no need to "register" for voting or even do anything. If you're past 18, you'll get the voting cards in your mailbox where you're officially living. Of course you should be registered as a citizen but that's obvious.
    – Bregalad
    Commented Sep 4, 2015 at 19:09
  • In some places, you can register on the day of the election by showing up with your ID.
    – WBT
    Commented Sep 5, 2015 at 16:07
  • @Bregalad "but that's obvious": it isn't so obvious in the US, where there is no registry of citizens.
    – phoog
    Commented Nov 12, 2016 at 14:07

2 Answers 2


Hopefully someone with more expertise than I have can provide more details but having a list of all electors is in any case useful to ensure the integrity of the process.

Even if you require people to show some ID, you don't want them to be able to vote in several places, you need to know exactly how many people could vote in a constituency, check they are eligible to vote in that constituency, etc. And everywhere I have voted (which includes several countries because as EU citizen I could vote in local elections outside of my country of origin), this means I had to sign in a register or at least that someone checked that my name was on a list.

Requiring voters to register explicitly is a simple way to manage these lists. You could imagine other solutions, especially with electronic voting systems, but, e.g., writing down the details of every person who shows up to vote and then cross-checking those lists after the fact would be much more cumbersome than checking the details of each voter against a pre-existing list.

Also, there are countries where you don't have to register per se, you are either automatically added to the election roll when you turn 18 or the list of eligible voters is based on a (mandatory) population register. But in countries like the US or France, there is no such population register or any obligation to register your place of residence with the authorities (apart from specific purposes like paying taxes) so if you want to vote, you have to register separately.

Incidentally, it's sometimes possible to vote in all polling places in your city or constituency but there are also places where you have to register for a single polling place. It might sound old-fashioned but that's a low-tech relatively fool-proof way to reduce the risk that someone would cast several votes, as the lists can thus be cross-checked well in advance and voting is impossible if you are not on the list.

  • 1
    No population register in France? Interesting — in The Netherlands we like to attribute our good population registers to Napoléon.
    – gerrit
    Commented Sep 9, 2015 at 18:20
  • @gerrit In France, nowadays, the key register is the register of births. You have to produce an extract of it for various purposes and things like marriage, divorce and death are also inscribed there, in the margin (“mentions marginales”). But you don't have to register your residence or inform the authorities when you are moving.
    – Relaxed
    Commented Sep 9, 2015 at 19:02
  • 2
    Cross-checking after the fact is also problematic because when the election is secret (as in any reputable democracy) there is by definition no way to remove their vote from the result.
    – Philipp
    Commented Sep 21, 2015 at 14:11
  • @Philipp Excellent point! But usually honest mistakes could not possibly change the results and could be ignored (that's the standard used in some countries at least). By contrast, large scale fraud would result in the whole election being cancelled. Cross-checking after the fact would detect and deter the latter.
    – Relaxed
    Commented Sep 21, 2015 at 14:17

Additionally to Relaxed answer, there is other reason for registration; namely, that the ID itself is not proof that the person is eligible to vote.

Some cases may be:

  • People who have lost the right to vote, due to a legal process (either automatically as in some places, or because part of the sentence was the loss of such a right).

  • Foreign people; even legal aliens are seldom allowed to vote unless they get citizenship. Of course this last one could be prevented if the ID specifies the nationality of the holder.

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