For a lot of countries citizenship doesn’t equate to having to pay tax.
US requires overseas residents to pay income tax up to a point, Canada does not. If you’re a citizen of both and say you reside in Singapore; you pay Singaporean income tax and some US tax, but not Canadian tax.
There are also residency rules (usually judge by where you spend 183 days a year). That is your primary tax residence.
Source: this is my exact situation
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