Use Form T777S.

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 

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 one of our upcoming software updates. It will be found when you enter your T4. Scroll down to the bottom of the T4 where you will be asked about working from home.

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 link below for more information.

Why does TurboTax say my forms are locked or haven’t been finalized?

Thanks .. this is exactly what am looking form, so when TurboTax will enable this feature in the online version?

We are sorry for the inconvenience while TurboTax is working on the release of the T777S 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.

Thank you for using TurboTax.

hello TurboTax, 

Your answer in this thread centres around the more complex deduction using the form.

I want to use the flat rate (up to $400) deduction for home office expenses due to COVID.

Why has that deduction feature not been activated? 

When will it be?

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 is a Canada Revenue Agency link with information regarding:

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 one of our upcoming software updates. It will be found when you enter your T4. Scroll down to the bottom of the T4 where you will be asked about working from home.

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 link below 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/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 or before. 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.

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.

I found this form in my prepared Tax return.

And I have tried to  insert 400$ as flat rate following instructions.

The software does not allowed me overwrite 0.00, nothing works there, not double clicks or anything

How should I do it?

Thank you