Mine waited about 3.5 months. They send me a letter a few weeks after submitting my tax saying that it's under audit and if I do not hear from them in 3 months, I should contact them. So I contact them late June and got my cheque a few days later.

I called them straight away.
I think you should call and chase them for your refund as well.

I would like to know this as well.
I file the tax for both my parents and myself. For me, my PC field was greyed out, I claimed for PC last year. But for my parents, their PC field is fill-able, their claim for PC was 2 years ago, which also means cannot claim since can only claim once in 3 years. So I'm abit confuse if the field is not greyed out means can still claim?

on your EA form, the total remuneration means salary + bonus + allowance + benefit in kind (eg, car benefit) + bla bla bla = total income excluded the tax exempted allowance

means your total income of the year is the total income + the column G.  i think you take the correct figure, you can just ignore the column G since it is not taxable.

so far i have not seen any half half claim unless due to divorced couple.  should let the one with higher tax bracket to claim the relief

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Only 1 parent can claim.
50-50% is for divorced couples only.