Canadian High Interest Savings Bank Accounts

One of my clients contributed $ 5,000 to her TFSA account in 2009 and made a return of 15%. she pulled out the money in 2010.
So in 2011 she can re-contribute the total amount she took out in 2009, that is $5,750.

If you have more than one registered TFSA account than you have to keep track of your in and out.

Correct…unlike an RSP, you can withdrawal from your TFSA in any given year and re-contribute this amount back in subsequent years. All contributions & withdrawals within a TFSA are tracked by the FI and then reported to CRA to adjust your contribution room.

BUT you are absolutely correct…if you have multiple TFSAs you will really need to watch all transactions, as it isn't hard to make a mistake and over contribute and be subject to CRA penalties!