For example, your Transfer Account, Income Account or both have balance $100 at the end of a month, then BetaRill charges 1%($1) in the case. The $1 is saved on Transfer account, and you can use it to transfer between BetaRill Members and etc, anyway.

Note 1: for every month the fee charge will be saved on your Transfer account on BR Wallet. Assume your balance is $100 at first month, $50 at second month and $200 at third month, then:

1st month was charged $1(1%), 2nd charged $1.5(1%), 3rd month charged $1.8(0.9%), and all the charge amounts will be saved to Transfer Account.

In this case, if you will request Withdrawal of funds, ie. $300 in 4th month, you will get $300- $1 - $1.5 - $1.8 - $2.4(0.8% from $300) = $293.3. 

Note 2: all charge amounts depend on what balance you have on your Transfer Account, Income Account or both (charge rates are from 1% to 0,1%, look BR Wallet (Rates tab).