Self Employed and Employed tax refund

Hello everyone, I'm looking for a bit of advice on tax refund. Half way financial year I started full time employment along running small business from home as self employed. Now I'm do to receive overpaid tax refund (overpaid by my employer). How can I register this payment ?? As self employment income for new tax year ??? Or will it be automatically adjusted and I don't have to do anything ??? Or anything else ??

Hi Marcin Marczewski,
Please tailor your tax return to include all your income from PAYE and self employment, any refund due will be calculated from the amounts provided. 
Please see guidance here:
How do I tailor my Self Assessment tax return?
Thank you.