Imogen, a former employee of Dhissom plc, resigned and became self-employed in January 2017, operating her own Indian restaurant. The assignment requires calculating Imogen's tax-adjusted trading profit for the nine-month period ended September 30, 2017, as well as income tax payable for the 2016-17 tax year. Additionally, national insurance contributions are to be calculated for both employed and self-employed periods. Finally, advice is sought on the consequences of not making the balancing payment for the 2016/17 tax year by the due date.