How is TFSA contribution room calculated?
Available TFSA contribution room generally includes unused room carried forward from previous years, the current year's TFSA dollar limit and withdrawals made in previous years, less contributions already made.
TFSA contribution room formula
Current-year TFSA dollar limit
+ Unused TFSA contribution room carried forward
+ Withdrawals made in previous calendar years
− TFSA contributions already made
= Estimated available TFSA contribution room
