Employee vs Contractor Calculator

The true cost of employing someone extends well beyond their gross salary. Employers pay secondary Class 1 NI contributions at 15% on earnings above the Secondary Threshold (£9,100 for 2026/27). Auto-enrolment pension contributions add a minimum 3% of qualifying earnings. Additional employer costs often include recruitment fees, training, office space, equipment, employer's liability insurance, and payroll administration. These overheads typically add 20–35% on top of the gross salary.

A contractor or freelancer, by contrast, charges a day rate or project fee with no employer NI, pension, or benefit obligations on the hiring business. However, the day rate is typically higher to compensate the contractor for bearing their own tax, insurance, pension, holiday, sick pay, and bench time between contracts. A rough equivalence is that a contractor's annual billings need to be 30–50% higher than an equivalent salary to achieve the same take-home, depending on IR35 status.

The comparison must account for hidden employer costs: statutory sick pay obligations, maternity/paternity cover, redundancy liability, annual leave (typically 28 days minimum), training investment, and management overhead. Contractors provide flexibility—you pay only for productive days—but the relationship must genuinely reflect self-employment to avoid IR35 reclassification, which would impose employment taxes retrospectively on unpaid NI and PAYE.

Employee vs contractor — UK tax differences. Employee: PAYE (income tax at marginal rate); employee NI 8%/2%; employer NI 15% (paid by company); auto-enrolment pension. Effective tax 25-50% on £50k. Contractor (limited company outside IR35): salary £12,570 + dividends; effective tax 28-35% on £80k. Contractor (umbrella/inside IR35): PAYE equivalent — same as employee. Sole trader contractor: income tax + Class 4 NI 6%/2%.

Total cost to employer comparison. Sample employee £50k salary: employer NI £6,750 (15% × £45k); pension match £2,500 (5%); employer total cost £59,250. Same role as contractor £400/day × 220 days = £88k contract — employer saves no NI/pension. Hidden contractor savings: no holiday/sick/maternity costs; no employment law liability; flexible scaling. Pure cost: contractor 30-50% more expensive but often offset by skill flexibility.

IR35 status — critical for contractors. Inside IR35: taxed as employee — Ltd company tax advantage eliminated. Outside IR35: full tax efficiency. Since April 2021: medium/large clients determine status; small clients (<£10.2M turnover) — contractor decides. CEST tool (gov.uk) gives initial view. Tests: control, substitution, mutual obligation, financial risk. Disputed cases: Tribunal decides. Many contractors take inside-IR35 ONLY at 20-30% premium to permanent equivalent.

Benefits comparison. Employee: pension match (free money); 25-30 days holiday + bank holidays; SSP £116.75/week sick pay + employer enhancement; maternity/paternity 39 weeks paid; private medical insurance often; bonus + shares + commission; career progression structure. Contractor: NONE of the above; must self-insure income protection (£20-£60/month); pension fully own responsibility; holiday = unpaid time off.

When to choose each. Choose employee if: prioritise stability, need pension match, want benefits, family financial responsibilities. Choose contractor if: 20-30%+ premium achievable, can manage business admin, comfortable with risk, prefer variety, willing to handle own benefits. Many UK workers blend: employee 2-3 years then contractor, or vice versa. Best income: contractor outside IR35 at premium £500+/day; least: employee on minimum wage.