George Costanza a retired architect and former marine biologist received old-age security (OAS) payments during the 2020 year totalling $7,600. His Division B income is $90,000 mostly from his defined benefit pension plan with his former employer. No amount of OAS was withheld from the OAS payments as his income was lower in previous years.

Determine Georges OAS repayment as well as any tax advice you may have for him, in point form.