Paying out security deposit interest in Chicago

[Ryan Redenius]

I have two tenants who are both up for renewal.  I took security deposits equivalent to one months rent.  The security deposit interest rate in Chicago is .01%.  My question is about how I go about paying out the interest earned.  Do I need to actually pay my tenant every year, or do I just include the accrued interest with the security deposit (minus any expenses for damages) at the time the tenant moves out?  

I could be reading way too much into this, but I know the consequences of not doing this correctly could be costly if the tenant decided to take legal action, so I want to make sure I get it right.

Thanks in advance for the help.