I can't say exactly how much it would be. I know initially in Canada when municipalities were implementing it, there was a feeling that Internet voting was going to break the bank. What we have actually seen is that some municipalities have introduced it as a complementary method of voting in addition to paper voting. They've been able to keep their election costs the same. Typically they do this by having the same number of polling stations, but they'll reduce the number of tables within the polling stations. They find that they don't need them, because when they offer online voting at the municipal level, they see a lot of people moving to that voting method.
On August 23rd, 2016. See this statement in context.