Though I've accountant, I like to do books first before sending everything. I received a huge bill ever £12000.00 last year and after questioning tax office they sent me back a little over £2000. The reason for large tax was due to years back of not paying the right taxes they said! So I've always had a separate account for taxes or set up a direct debit with them so that when tax bill arrives it doesn't shock in the system although some rare occasion you're paying wrong taxes & this isn't your fault. Another bill to worry about!