As a UK resident all foreign income, including any interest from foreign accounts should be declared to the UK unless there is a double taxation exemption to negate this.
Tax on foreign income
There are no income tax implications of transferring capital from one account to another.
In terms of an NRE account, although NRE interest income is not taxable in India NRE interest income has often been mistaken as non-taxable in the UK this is incorrect, UK tax residents are subject to UK taxation on their worldwide income and gains subject to any remittance basis claims.
Under the UK-India Double Tax Convention, NRE account interest taxable in the UK can receive credit for Indian tax even if this has not been paid as the credit relief amount is calculated through the tax spared mechanism, which deems Indian tax to have been paid at the marginal rates applicable there. (UK-India DTC notes page HMRC’s Double Taxation Relief Manual DT9553).
Under the UK-India Double Tax Convention, NRE account interest taxable in the UK can receive credit not exceeding 15% for Indian tax even if this has not been paid.
UK tax relief not exceeding 15% is available for ten years from the opening date of the NRE account per Article 24(5) UK-India Double Tax Convention.
NRE interest income should be declared within an in individuals UK self-assessment return.