Taxed on our ISA's!

webmasterpolo wrote: »

For a stocks and shares ISA it's actually what's called a 10% tax credit.

Biggles was correctly referring to cash held on deposit in an S&S ISA ..... which is taxable at 20%.

Aim for a HMRC tax refund plus some good will from Halifax over and above the lost interest while waiting for the refund.

That's also wrong. As the refund cannot be re-applied to the ISA if the full year subscription has been used. What should be aimed for is that Halifax restore the position the OP would have been in had the 'error' (assuming) not occurred.
And that is to place the incorrectly deducted tax back into the ISA directly ... which they can do. It will almost inevitably lose compounding from the date the tax was deducted to the date restored (as I doubt they can date it retrospectively). And the OP should look for a one-off compensation to cover that ..... and Halifax need to consult HMRC as to whether than can be put into the ISA ... as this is unusual and isn't covered by guidance