It is also expected the Government will raise the DIRT tax on savings to the same level of income tax.
That would see the current rate of 33% for higher earners increase to 41%.
An option they might like is get the bank to charge 41% and then it's up to the individual(s) to get a refund by proving they should pay 20% or 0%.
A precedent of sorts would be tax on company share option schemes, this is taxed at 41% (or 52% to be more accurate) regardless of income and it's up to the individual to get approval from their tax office to pay at the standard rate.