Its dependant on whether you will receive a bigger benefit from the detailed method over the flat rate, as well as the complexity of your expenses; the flat rate is much simpler to report.
Flat rate method
If you worked for more than 50% of the time from home for a period of at least 4 consecutive weeks in the year due to the Covid-19 pandemic, you can claim $2 for each day you worked from home during that period. The maximum amount that can be claimed is $400 per individual in 2020 and $500 per individual in 2021 and in 2022.
The Detailed Method
A tool you can use here: Calculator for the detailed method
With the detailed method you can claim the actual amounts you paid (supported by documents) which may provide you a better benefit, however it is much more complex.
The type of expenses you can claim:
What you cannot claim:
To summarize: It is a matter of the amount of benefit you may claim and how complex your expenses may go. If you have plenty of amounts to report beyond the $500 maximum claim amount for the flat rate, then you should go for the detailed method.
For more information, check out: Canada Revenue Agency - Work From Home Covid-19
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