Tax proration on Revenue recognition functionality

Hi All,

Please help on the following requirement.

- In the revenue recognition program, Tax should calculate on the prorate revenue.

Ex: if Company received the invoice amount 1320/- (inv 1200 + Tax 120) in advance from the customer for 12 months.

Revenue should be prorated for 12 months(this is ok), and Tax also should calculate  on the basis of prorated revenue amount on every month

pls hep us on, how to prorate the tax each month based on the revenue?

Any workaround would be appreciated.

Thanks

Ramesh