Rates in table apply above the stated thresholds. The chart and table ignore the employment allowance. Employer NICs rates shown are the rates of secondary Class 1 NICs (on ordinary earnings), Class 1A NICs (on those benefits in kind that are subject only to employer NICs) and Class 1B NICs (on PAYE settlement agreements, arrangements negotiated between employers and HMRC whereby employers agree to pay tax on earnings or benefits in kind which would otherwise fall to be paid by their employees). Class 3 NICs are voluntary and paid at a flat rate of £15.40 a week in 2021–22 in exchange for certain benefit entitlements. In the chart, self-employed (Class 4) NICs line excludes Class 2 contributions, which are shown in the table. The chart shows annual thresholds, which for employee and employer NICs assume earnings are stable throughout the year.