Question to the HM Treasury:

To ask Mr Chancellor of the Exchequer, what change there has been in the incidence of failure by employees to pay appropriate tax and National Insurance.

The estimated proportion of small- and medium-sized enterprise employers failing to fully meet their obligations in respect of operating Pay As You Earn (PAYE) is published in ‘Measuring Tax Gaps; 2015 edition' (table 6.8, p.53).

Comparable figures for large employers are not available, but an estimate of the tax gap for large employers can be found on table 6.9, also on p.53.

https://www.gov.uk/government/statistics/measuring-tax-gaps