From April 2011, significant changes will be made to the UK's PAYE tax withholding system. A new D1 tax code will apply a 50% tax rate to very high secondary incomes. Real-time reporting of payroll information to HMRC will begin rolling out in 2012. National insurance contribution thresholds will increase substantially and rates will rise slightly. Various pension contribution limits and rules will also be changing in upcoming years. Employers should review systems and software to prepare for these PAYE and reporting changes.