Sales tax on subscription

Hi,

I was wondering if there is a way of the membership plugin calculating sales tax (in the uk it is 20%). All my clients membership subscriptions are tax inclusive so I could add the sales tax on to the subscription price but because the plugin only allows me to enter the price in whole pounds this would not be accurate. eg Member yearly subscription is £59 exc vat so should be £70.80 inc vat (I would have to round this up to £71).

Many thanks,

Alan