In the recently issued Regulation Round Up the FSA have confirmed that their online fee calculator will be updated at the end of May to allow firms to calculate the level of their forthcoming fees.
The calculator will be updated with the 2011/12 fee rates at the end of May, however the FSA publication includes the caveat that the system will allow you to see what fees you are LIKELY to be charged, so there may be some (usually fairly small) differences to the final invoices issued .
Invoices are due to be sent out in June/July with payment due within 30 days.