Personal tax returns for the year to 5 April 2018 need to be filed by 31 January 2019
The final tax payment for this tax year plus 50% of the payment on account in advance on the 5 April 2019 tax return will also need to be paid by 31 January 2019.
A change in income circumstances can have an impact on your payment on account for the next tax year.
If you would like any assistance in estimating your future tax liabilities, do not hesitate to get in touch.