InsightOSFree UK workforce planner
See the workforce cost behind the employer NI increase.
The employer National Insurance rate rose from 13.8% to 15% and the secondary threshold fell from £9,100 to £5,000 from 6 April 2025. Model the effect across your workforce, then compare a new hire with InsightOS at £50 per user per month.
Whole-workforce impact
£17,796 more each year
Estimated increase in employer National Insurance for 20 employees on an average salary of £32,000, compared with the pre-6 April 2025 rate and threshold.
Current employer NI across workforce
£81,000
Current NI per employee
£4,050
A new hire today
£36,050
Salary plus £4,050 employer NI at the current 15% rate. Pension, benefits, recruitment and training are not included.
Potential time returned
624 hours
Per year, based on the 12 hours of scheduling and payroll administration you entered each week.
InsightOS comparison
£12,000 a year
£50 per user per month for 20 users. This is less than the estimated employer NI increase shown above.
The NI increase alone is equivalent to 12 months of InsightOS.
Method: This tool uses the standard employer Class 1 National Insurance category as a planning estimate. It compares 15% above £5,000 with the pre-6 April 2025 13.8% rate above £9,100. It does not account for Employment Allowance, category letters, pay periods, reliefs, or individual circumstances.
Rates checked 28 September 2026 against GOV.UK National Insurance rates and categories. Use HMRC guidance or a qualified adviser for payroll decisions.