What are the hours of work? <a href=" http://www.buffaloimplantgroup.com/nexium-mg-20.pdf#biscuit ">taking nexium twice a day</a> The tax gap is compiled from about 30 separate estimates for different taxes. It is broken down by type of tax, customer group and customer behaviours, including tax evasion and avoidance, customer error, the hidden economy, criminal attacks and where tax cannot be collected because of insolvency.