ColinJL:
You are making such a narrow interpretation of "income" that it's unlikely that anyone here can give a definitive answer, yet many would be able to give a definitive answer if it was asked of interest with tax deducted at source, yet it is clear from your original point that you don't even recognise the correctness of that.
I have appended some info, which as the Rewards account was only fairly recently introduced (Feb 09), the very specific "reward" is not specifically covered, but the HBOS tax auditor may well have considered that "miscellaneous income" might apply, and hence the tax treatment you query. I am not surprised that HBOS would take that view. On the balance of probability it's obviously "income".
I sidestepped having to even consider the issue when I recognised how high a marginal overdraft rate the £1/day represented for small overdrafts. Thanks for presenting the opportunity to point that out.
Acknowledging the CAB online advice guide.....
"Income tax law defines income tax as a tax on income and sets out how each type of income listed below is charged to income tax:
- Employment income
- Pension income
- Social security income
- Self-employed income from a trade, profession or vocation
- Property income
- Savings and investment income
- Miscellaneous income."