Can I transfer my cra refund to my spouses credit

You are not able to transfer your income tax refund to your spouse's tax return.  If you are receiving a refund, you will receive it and if your spouse has an amount owing, he/she will be responsible for that.

when did come into effect - how come in prior years we were able to do this ? - Thanks for a reply

Unfortunately, we cannot find any time this was allowable by the Canada Revenue Agency.

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