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Rule number 1: Don't lie. Even if you're approved and get your citizenship, having lied on your application could be grounds for revoking your citizenship down the line. Bad idea...
 
If the income is lower than the lowest tax bracket then this is only an issue if it significantly adds to your global income...unless your home country has a punitive tax bracket such that the lower end is prohibitive most jurisdictions I gather have nothing on Canada..well we get high quality free health care, a reliable police service etc. Come clean with CRA - they have a scheme where they forgive income you 'forgot' to declare. Have you worked out what back taxes you would owe?