Marriage allowance & interest received

ab56

Wonder if marriage allowance allowed (or advisable) in following circumstances.  OH receives state pension of say £9000 and interest income of £15000.  Tax, by my reckoning payable on £5500 (allowances = personal allowance 12500 + first 5000 of investment income (no dividends) + first 1000 of investment income @ 0%). 

 My 'only income' is £15000 interest. No earned income or pension received.  Does full personal allowance have to be deducted from my income or could £1260 re marriage allowance be transferred to OH, to reduce OH's tax liability?  My tax liability being Nil in either scenario??
Many thanks in advance.

Dazed_and_C0nfused

As neither of you are liable to higher rate tax then either of you could successfully apply for Marriage Allowance.

If you applied you would get a reduced Personal Allowance of £11,310 and would be liable to tax on £3,690.  All of which would be taxed at the savings starter rate of 0%.

Your spouse would have a Personal Allowance of £12,570 and be liable to tax on £11,430.
£6,000 taxed at 0% (savings starter rate and savings nil rate)
£5,430 taxed at 20% = £1086
The Marriage Allowance tax credit of £252 will reduce the tax actually payable to £834

All figures relate to the current tax year and assume you aren't Scottish resident for tax purposes.