No one wants to pay more taxes. If there is a possibility to minimise the tax burden, then business owners would certainly want to know about it. As a reputable accounting firm, why not provide tax advice to help your clients reduce their tax liability?
Of course, the tax system is complex, but with the experience you have, you may easily understand and navigate through it. Besides, you already have the essential accounting data of your clients. Looking at this data, you can easily identify all the tax-deductible expenses and advise clients how to reduce their tax liability.