Expired Non Capital Loss

Hi Everyone,
I have a client who has a non capital loss that arise in 2005 and expired in 2015. He owed taxes in 2015 but missed applying the losses. Can I go back and submit an adjustment for his 2015 tax return to apply the losses? Aside from opening up statute barred years, are there other issues I should be aware of?

Thanks!

You can revise back 10 years if it results in an advantage to the taxpayer

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Thanks @benoit.associes1 !