Company promises to waive annual 0.4 per cent annual management fee. Savers wishing to place their money in a bank that will shield their investments from controversial industries such as fossil fuels and tobacco have a growing number of places to turn. However, this month TAM Ethical has launched a new offer to attract more people to green investments by launching a dedicated Ethical ISA for customers with a minimum of £10,000. The new TAM Ethical ISA option will waive the annual 0.4 per cent annual management charge to anyone signing up this year.