A debt is considered as being forgiven for tax purposes if, generally:
If a private company forgives a debt, it is considered a deemed dividend under Div 7A of ITAA 1936. A debt is forgiven if a reasonable person would conclude that a creditor would not insist on payment or rely on the borrower’s obligation to pay.
Without more, allowing more time to repay a debt due to COVID-19 will not result in the debt being treated as forgiven.