hope this helps:
From 6 April 2015, many more people will no longer be liable for tax on their savings income, such as interest they receive on their bank and building society accounts. This is most likely to affect people with low overall
incomes, or people whose income is mainly from their savings.
You could benefit if:
•
your total taxable income in 2015-16 will be below £15,500, or
•
your total taxable non-savings income in 2015-16 (such as earnings or pensions) will be below £15,500.
just to further confuse the issue - from April 2016 there is a £1000 savings allowance (applicable to everyone not just low income savers) which does mean that the first £1000 of savings interest (I wish) is not taxable saving you theoretically £200 