When you don’t know your spouse’s income and can’t find out through reasonable means, the Canada Revenue Agency (CRA) recommends that you enter your best estimate.
The CRA will assess you and your spouse’s (or former spouse’s) returns together to ensure that the credits and deductions were correctly applied between you.If there’s any inaccuracy or mismatch, they’ll reassess your returns
Tip:You may want to save your tax refund (if any) until you receive your Notice of Assessment or Reassessment in case some or all of it needs to be repaid
Important:If you don’t enter your spouse’s income (or an estimate), it’s important that youdon'tclaim the Spousal Amount. For more information, read theSpouse or common-law partner amountpage on the CRA website.