Yes, study permit/work permit holders are eligible to file their tax-returns in Canada from the day they receive their permit and receive tax refunds.
Yes, you are eligible to file first year tax returns if you moved to Canada at any time on/before December 31st. You can receive refunds up-to $900.
Yes, with $0 income you are still eligible to file tax returns in Canada and get refunds of up to $700 from the Government of Canada.
For the 2021 base year (payment period from July 2022 to June 2023), you could get up to:
Welcome to Canada Benefit or Landing benefit in Canada is the benefit for the people who move to Canada in December, or have not worked in the year that they moved to Canada in.
They still receive a GST/HST Refund and Provincial Tax Refund which totals up-to $900 in refunds.
So without working, or just by moving to Canada in December people receive up-to $900 from the Government of Canada, which people tend to call Welcome to Canada.