Employment Rights Act 2025: what employers need to know

Written by EmployerCalculator Editorial · Reviewed against official UK sources · Last updated: April 2026

Operational implications of Employment Rights Act 2025 reforms for UK employers, including unfair dismissal day one rights, flexible working and zero-hours changes.

The key changes employers need to prepare for

The Employment Rights Act 2025 introduces the most significant expansion of employee rights in a generation. The headline change is the removal of the two-year qualifying period for unfair dismissal claims, making unfair dismissal protection a day-one right for most employees. The practical implication is that probation periods will need to be better managed and more consistently applied.

Other significant changes include: flexible working becoming a default right from day one; zero-hours workers gaining the right to guaranteed hours contracts based on their regularly worked pattern; third-party harassment rules being strengthened; and trade union access rights being expanded.

Not all reforms have confirmed implementation dates. Leadership teams should separate confirmed commencement orders from proposals still in consultation. Planning against unconfirmed assumptions creates effort that may need to be re-done when dates slip.

Day-one unfair dismissal: practical implications

Once day-one unfair dismissal protection is in force, employers cannot simply dismiss employees during a probation period without following a fair process. The government has indicated that probation periods of up to nine months will be the relevant framework, with a statutory procedure expected to apply during that window.

In practice, this means probation management needs to become more structured. Clear performance objectives at the start of employment, documented mid-probation reviews, and formal probation failure conversations with evidence all become more important. The risk of an informal 'this isn't working' conversation followed by immediate dismissal is materially higher than under the current two-year qualifying period.

Review your probation policy and manager training before implementation. Line managers are often the weakest link in probation management because they are not trained to give honest performance feedback early enough for it to be documented and acted on within the probation window.

Flexible working and zero-hours changes

Flexible working is already a day-one right to request since April 2024, but the Employment Rights Act extends this by limiting the grounds on which employers can refuse. Where flexible working is refused, the reasons must be demonstrably reasonable and documented. This raises the bar above the current eight statutory grounds for refusal.

Zero-hours and minimum-hours workers who work a regular pattern over a reference period will be entitled to a guaranteed-hours contract reflecting that pattern. Employers who rely on zero-hours arrangements for operational flexibility will need to either accept that pattern becoming contractual or restructure rotas to avoid regularity. Both approaches carry cost and administrative implications.

Review your workforce composition before implementation. Zero-hours usage is not uniformly problematic — some workers genuinely prefer flexibility — but where it is being used to avoid employment cost and legal risk, that model will need to change.

Workforce planning and cost implications

The combined effect of these reforms is to increase the average cost and legal risk of employing people, particularly for lower-paid and variable-hours workers. Employers should update their hiring cost models to include a higher provision for probation management, performance process time, and potential settlement costs for early-stage dismissals.

Structured onboarding and probation programmes — which are good practice regardless of legislation — become more valuable as legal protection for day-one rights. Employers who already run well-documented probation processes will see less disruption than those who rely on informality.

Use the next six months before implementation to complete the gap review: contracts, handbooks, probation policies, manager training, flexible working procedure and zero-hours audit. Set one deployment date for updated documentation so that all managers are working from the same version.

Building a compliant cost model

Every significant employment law change creates a corresponding administration cost that rarely appears in headcount budgets. Estimate the time cost of better probation management, more flexible working requests, guaranteed-hours reviews and any workforce consultation requirements. That time has a real payroll value.

Where the legal risk of day-one dismissal is real (for example, a hire into a business-critical role that does not work out within a few months), model a potential settlement scenario alongside the direct employment cost. Having that number visible in advance makes the decision to hire — or to take legal advice — faster.

Track compliance ownership clearly across HR, payroll and line management. When policy changes interact with payroll rules, out-of-date processes create avoidable errors. Assign named owners for each area of the reform and review compliance quarterly for the first year.

Frequently asked questions

How much does it cost to employ someone in the UK?

The true cost to employ someone in the UK is typically 15–20% above gross salary. At £30,000: employer NI £3,750 + pension £713 = approximately £34,463 per year. At £50,000: employer NI £6,750 + pension £1,313 = approximately £58,063 per year. Adding workplace overheads of £2,000–£5,000 can bring the total to 20–25% above the headline salary.

What is the employer NI rate for 2026/27?

For 2026/27, employer Class 1 National Insurance is charged at 15% on employee earnings above the secondary threshold of £5,000 per year (£96 per week, £416 per month). This rate increased from 13.8% in April 2025, when the threshold was simultaneously cut from £9,100 to £5,000. Both changes apply from 6 April 2025.

How much employer NI do I pay on a £35,000 salary?

At £35,000 salary, employer NI for 2026/27 is £4,500 per year — 15% on £30,000 of earnings above the £5,000 threshold. That is £375 per month. In 2024/25, the same salary produced £3,585 in employer NI. The April 2025 changes therefore add £915 per year on this salary alone.

What is Employment Allowance and who can claim it?

Employment Allowance lets eligible employers reduce their annual employer NI bill by up to £10,500 in 2026/27, increased from £5,000 in 2024/25. The previous £100,000 NI bill eligibility cap has been removed, so more businesses qualify. Companies where the only paid employee is also a director cannot claim. Apply through payroll software via the Employer Payment Summary indicator.

What is the total employer cost above salary?

Beyond salary, employer cost includes: employer NI (15% on earnings above £5,000), employer pension (minimum 3% of qualifying earnings between £6,240 and £50,270), and overheads such as equipment, software and workspace. For most UK salaries this adds 12–20% above headline pay. Use the inputs above to set your exact pension rate and overhead figure.

What changed for employers in April 2025?

Three changes took effect from 6 April 2025: the employer NI rate rose from 13.8% to 15%, the secondary threshold was cut from £9,100 to £5,000, and Employment Allowance increased from £5,000 to £10,500 with the eligibility cap removed. For a £30,000 salary, annual employer NI increased from approximately £2,884 to £3,750 — a rise of £866 per year.

How is employer NI different from employee NI?

Employer NI is a cost paid by the employer on top of gross salary — it does not reduce take-home pay. Employee NI is deducted from the employee's wages instead. For 2026/27, employees pay 8% on earnings between £12,570 and £50,270, then 2% above that. Employers pay 15% on all earnings above £5,000 with no upper cap. This calculator covers the employer side; for employee take-home pay see AfterTaxSalary.co.uk.

What are employer costs in the UK?

UK employer costs in 2026/27 are: gross salary, employer NI at 15% on earnings above £5,000, employer pension at minimum 3% of qualifying earnings (£6,240–£50,270), and any operational overheads such as equipment or software. For a £35,000 salary, statutory employer costs (NI + pension) add approximately £5,363/year before overheads.

How much do I cost my employer in the UK?

If you earn £35,000, you cost your employer roughly £40,363/year — your salary plus £4,500 employer NI and £863 minimum pension. At £50,000, the total is approximately £58,063. Your employer pays these on top of your salary; they are not deducted from your pay. Use this calculator to see the exact figure for your salary.

Is this a PAYE cost calculator for employers?

Yes. PAYE employer costs include employer NI — calculated at 15% above £5,000 for 2026/27 — plus the employer's auto-enrolment pension contribution. The full calculator models both alongside any overhead assumptions to give a total PAYE-basis employer spend per employee.

What is a cost to company (CTC) salary in the UK?

Cost to company (CTC) in the UK refers to the total annual cost of an employee to their employer — salary, employer NI, pension, and overheads combined. A £35,000 CTC salary typically means a gross salary of roughly £30,000–£32,000 once the employer's NI and pension obligations are included in the total. Use this calculator to work backwards from a CTC budget to a gross salary.

Once you know the cost — what next?

Running payroll correctly after you have calculated employer cost is the next practical step. The tools below handle HMRC RTI submissions, auto-enrolment pension and payslip generation automatically.

Compare UK payroll software → Open employer cost calculator Check Employment Allowance eligibility

EmployerCalculator Editorial. Content reviewed against HMRC guidance. Estimates only — not financial or legal advice. See our methodology and sources.