Hello, I recently acquired a client that started his Window Tinting business in June 2017. His quarterly taxes are due (well overdue now) and he wants me to file for him. He is using his business account for everything. He has not reconciled any bank statements to his checkbook ever. I am stuck as to where to begin. I mean I had him print me a copy of his monthly bank statements. I have copies of most of the sales invoices (income), I have his purchases (both personal and business), I have deposit slips, atm withdrawl, and money order receipts for rent (personal and business). Should I try to reconcile his bank account first? And then separate his business from his personal? I mean just where do I begin. Please help me.