Computer used for investing: tax write-off?

Hello.

I’m considering purchasing a new computer and I will use it as a tool to help me buy stocks. It will be used for research, purchases/sales, and monitoring of positions. I’m located in Canada. If I’m not able to have it as a write-off on my personal income tax, would I be better off forming a holding company and using that method to make it a tax write off?

Thanks.

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