How much Income tax will be paid?

66 yr. old. Total annual income made up of UK State Pension and private Retirement Pension £15,143 p.a. Savings in ISA's so no interest or other earnings to declare. If tax allowance remaind the same as this year (£9,940) and tax remained at 20% can someone say the amount of tax that would be taken off monthly in the next financial year? Think I am able to work this out myself but rather than explain what you do to calculate this would rather have the figure you think would be deducted each month. Thank you.