Employer National Insurance is one of those costs that's easy to underweight when you're building a hiring plan, because it doesn't show up in the headline salary you offer — it shows up in what it actually costs you to employ someone. When the rate or thresholds move, that gap between 'salary' and 'true cost of hire' moves with it.

For small employers, this matters more than it does for larger ones, because there's less slack in the model to absorb it quietly. A change that a 200-person company barely notices can meaningfully change the maths on whether your fifth hire makes sense this quarter or next.

It's also one of the few employment costs that moves on the government's timetable rather than yours, which is exactly why it's worth building a habit of checking rather than assuming last year's numbers still apply. A rate that felt manageable when you drew up a hiring plan in the spring can look quite different by the time you actually make the offer in the autumn.

Why the small print matters more than the headline rate

Coverage of employer NI changes tends to focus on the percentage rate, because that's the single number that fits in a headline. In practice, the secondary employment allowance and threshold changes often matter just as much for a small employer, because they determine how much of your payroll is exposed to the rate at all before it even applies. Two businesses with identical headcounts can face very different real-world costs depending on how their pay is structured against those thresholds.

The number to actually use

Whenever employer NI shifts, the useful move is the same: recalculate the fully-loaded cost of your next hire — salary, employer NI, pension contribution, and anything else that comes with putting someone on payroll — before you commit to a role or a rate. Don't work off last year's number. It sounds obvious written down, and it's still the single most common mistake small employers make when planning a hire: budgeting off the salary figure alone and being quietly surprised by the real number a month after someone starts.

A simple way to keep this current: whenever a rate change is announced, put a fifteen-minute meeting in the diary to redo the fully-loaded cost calculation for your typical roles, and update whatever spreadsheet or hiring plan you use to reflect it. It's a small habit that prevents a much larger surprise later.

A worked example: what a rate change actually costs

Take a hire on a £30,000 salary in the 2026/27 tax year. Employer's National Insurance runs at 15% on earnings above the £5,000 secondary threshold, so that's 15% of £25,000 — £3,750 a year on top of the headline pay, before pension contributions or anything else. Add the minimum 3% employer pension contribution on qualifying earnings between £6,240 and £50,270, which is 3% of £23,760, or £713, and the real cost of that £30,000 role is £34,463. Across a team of ten similar roles that's £44,630 of National Insurance and pension sitting above the payroll line — more than the cost of another full-time hire, with nobody having agreed to hire anyone.

The Employment Allowance is the offset most small employers should be claiming against that: up to £10,500 of employer's Class 1 National Insurance in 2026/27, which on the team of ten above wipes out roughly a quarter of the National Insurance bill. The exclusion to know is that you can't claim it if the only employee paid above the secondary threshold is also a director — so a single-director company with no other staff pays its employer's National Insurance in full.

Now move one variable. Drop the secondary threshold, raise the rate, or change the allowance, and every one of those figures shifts — which is why the calculation is worth redoing at each Budget rather than carrying last year's number into this year's hiring plan.

That's the number worth putting in front of whoever signs off your hiring plan — not the headline rate, which means little in isolation, but the fully-loaded cost per head, recalculated every time the rules move rather than left as whatever happened to be true the last time someone checked.

Where it changes decisions

This tends to show up in a few concrete places: whether a role gets filled as employed or via a contractor, whether a pay rise gets structured as salary or as a bonus, and whether it's worth bringing a role in-house versus keeping it outsourced a little longer. None of these decisions should be made purely on tax grounds — the wrong structure for the wrong reasons creates its own problems — but pretending the cost difference doesn't exist isn't a neutral choice either.

Employer NI doesn't change whether you should hire. It changes what the honest cost of that hire actually is.

Contractor vs employee: the other lever

A rising employer NI bill is one of the reasons the employed-versus-contractor decision keeps resurfacing for small businesses, and it's worth being honest about the trap here. Off-payroll working rules already determine whether a role can legitimately be treated as self-employed for tax purposes — that's a question about the actual working relationship, not a preference, and getting it wrong carries real HMRC risk regardless of how attractive the NI saving looks on a spreadsheet.

Where a role is genuinely, defensibly self-employed on its own facts, a contractor relationship avoids employer NI entirely, which is exactly why a rate rise makes some businesses look harder at roles they'd previously just have employed. But reclassifying an existing employee as a contractor purely to dodge a rate change, without the underlying working relationship changing at all, is the kind of decision that looks clever right up until an HMRC status review finds otherwise. Get advice before restructuring on this basis, not after.

The knock-on effect on pay reviews

It's not just new hires that feel this. Annual pay reviews get recalculated against the same fully-loaded cost, which means a rate rise can quietly shrink the pot available for increases even when the business's own performance hasn't changed. Being upfront with your team about why a review looks tighter than expected — rather than letting them assume it reflects on their performance — tends to land a lot better than staying silent about it.

What to check this week

If you haven't recalculated your fully-loaded cost per hire since the last rate change, that's the fifteen-minute job to do before anything else. Check three things: the rate itself, the threshold at which it starts applying, and whether your Employment Allowance eligibility is still being claimed correctly — it's a genuine, if partial, offset for many small employers, and it's easy to forget to apply once it's been set up and nobody's looked at it since.

None of this is a reason to freeze hiring. It's a reason to make sure the person doing your payroll numbers has the current rates in front of them before you make an offer, not after — and to build the habit of checking, rather than relying on whatever number happened to be true the last time you looked.

Common questions

What is employer National Insurance costing me in 2026/27?

15% on every pound an employee earns above the £5,000 secondary threshold, which is £96 a week. It is a cost to you on top of the salary, not a deduction from the employee's pay. On a £30,000 salary that is 15% of £25,000, or £3,750 a year; on £50,000 it is £6,750. The threshold matters as much as the rate for a small employer, because it is low enough that almost any part-time role paying more than about £100 a week now generates an employer National Insurance charge. Before you check anything else, confirm your payroll software has the current year's threshold loaded — an outdated figure quietly misstates every hiring calculation you make from it.

What is the Employment Allowance and do I qualify?

It reduces your employer's Class 1 National Insurance bill by up to £10,500 in the 2026/27 tax year, and you claim it through your payroll software. Most businesses, charities and community amateur sports clubs with employees can claim. One exclusion catches a lot of small companies: you cannot claim if the only employee paid above the secondary threshold is also a director. A single-director company with no other staff is therefore out; add one other employee paid above the threshold and you are generally back in. It is not applied automatically — the claim has to be made each tax year, and it is worth confirming your payroll is actually making it, because an unclaimed allowance is invisible on a payslip.

What does a £30,000 hire really cost once everything is added?

About £34,500 before you buy them a laptop. Take the £30,000 salary, add employer's National Insurance of 15% on the £25,000 above the secondary threshold — £3,750 — then add the minimum 3% employer pension contribution on qualifying earnings between £6,240 and £50,270, which is 3% of £23,760, or £713. That is £34,463. If you qualify for the Employment Allowance, up to £10,500 of employer National Insurance across your whole payroll is offset, which for a small team can remove that £3,750 entirely. Then add kit, software licences, employer's liability insurance and your own time spent recruiting and training — the item owners most consistently leave out.

Can I use contractors instead to avoid employer National Insurance?

Only where the role is genuinely self-employed on its own facts, and that is a question about how the work is actually done rather than a choice you get to make. If someone works set hours under your direction, uses your equipment, has no real ability to send a substitute and has no other clients, they look like an employee whatever the contract says. Reclassifying an existing employee as a contractor to sidestep a rate change, with nothing else about the relationship changing, is precisely the pattern an HMRC status review is designed to catch, and the bill lands on you as the engager with penalties and interest attached. Take advice before restructuring on this basis, not after.

Do directors pay employer National Insurance on their own salary?

Yes. A director's salary attracts employer's Class 1 National Insurance exactly as any other employee's does, at 15% above the £5,000 secondary threshold. That is a large part of why owner-managers of small limited companies often take a modest salary and draw the rest as dividends, which carry no National Insurance at all. The catch is the Employment Allowance exclusion: a company whose only above-threshold employee is a sole director cannot claim the £10,500, so the National Insurance on that salary is paid in full. The right salary level depends on your own circumstances and the current thresholds, so it is worth a specific conversation with your accountant each April rather than repeating last year's number.