The Second Incomes Campaign is for employed individuals with additional income that’s not taxed through their main job or another Pay As You Earn (PAYE) scheme. It enables an individual with untaxed income to get up to date with their tax affairs in a simple, straightforward way.
The guide tells individuals how to disclose their untaxed income and advises them that they have 90 days to calculate and pay what is owed. The guide can be found here.