Thank you for your question!
The “other income” section included on the income summary before you started your return as you mentioned, is most likely an Employee GST/HST rebate (GST 370 Rebate) showing up on Line 10400.
The employee and partners GST/HST rebate are available to:
The employee and partner GST/HST rebate is taxable income and must be included in income on line 10400 (line 104 prior to 2019) of your tax return for the year it is received. So if you've claimed the rebate on your 2019 tax return and received it in 2020, you would include it in your 2020 taxable income.
For more information about the GST/HST Rebate on your expenses, please kindly refer to the link as follow:
https://turbotax.intuit.ca/tips/did-you-know-you-can-claim-the-gst-hst-rebate-on-your-expenses-12072