Question: how do i know how much room i have in my tfsa?
Answer: Go to the CRA My Account login.
Log in with your preferred method. ... 
Under the tabbed header, navigate to RRSP and TFSA Screenshot.
Click Tax-Free Savings Account (TFSA) Screenshot.
Click Contribution Room Screenshot.
Click Next at the disclaimer Screenshot.
Look for 2018 TFSA contribution room on January 1, 2018.