From 1 January 2010 the VAT rate will return to 17.5%. BT, as well as other businesses, will be applying the new rate from that date.
Any charges incurred before 1 Jan 2010 will be charged at 15% VAT.
The restored 17.5% VAT rate only applies to prices from 1 January 2010.
We will be giving credits on future bills as appropriate.
So if you pay any bill that included prices that apply from 1 January 2010 or your account is in credit on 31 December 2009, VAT will be charged at 15%. Any adjustments needed will be applied on future bills.