Expenses related to a home workspace can be included on line 22900 but there are considerations to review with the new allowances and possibilities available due to Covid-19 this year. 

Here are Canada Revenue Agency links with information regarding Employment Expenses 2020 and CRA  Eligibility criteria - Temporary flat rate method 

Note: If using the form method, one of the forms required, the T777S-Statement of Employment Expenses for Working at Home Due to COVID-19, for the flat rate method will be available on our upcoming software update.

However and unfortunately, you may come across locked forms, or receive a message saying that forms aren’t finalized when using TurboTax, you will not be allowed to complete the filing of your return. Please see the following link for more information. Why does TurboTax say my forms are locked or haven’t been finalized?

We are sorry for the inconvenience and TurboTax is working on the release of the T777S and T777 right now with testing going on. Making sure all is right before the client uses it is of great importance to us. We thank you for your patience as the update will possibly be ready by end of next week. We will keep you updated.

Thank you for using TurboTax.

We are happy to report that the T777S/T777 forms have been updated and you can now complete entering your employment expenses. We have included below our TurboTax FAQ link to help you with this if needed.

Employment Expenses Tax Info Centre
 

Thank you for your patience.