Employer NI 2026/27: the exact rule changes from 6 April 2025
If you searched for an NI rise calculator, these are the two numbers that matter for 2026/27: employer Class 1 NI is now 15% (up from 13.8%), and the secondary threshold is now £5,000 (down from £9,100). Both changes started on 6 April 2025 and apply to standard employer NI calculations.
Those two changes compound each other. A higher rate means each NIable pound costs more, and a lower threshold means more salary is NIable in the first place. This is why many employers saw a larger payroll cost increase than expected, even before pension, benefits, or recruitment overheads were added.
The policy package also increased Employment Allowance from £5,000 to £10,500 and removed the previous £100,000 eligibility cap. That relief is meaningful for eligible employers, but it does not reverse the structural NI rise for every business. Your net outcome depends on payroll size and whether allowance can be fully used.
What the NI rise costs by salary: practical worked examples
At £30,000 salary, 2026/27 employer NI is approximately £3,750. Under 2024/25 rules, the equivalent NI was about £2,884. That is a rise of roughly £866 per employee per year. At £35,000, NI rises from about £3,575 to £4,500, adding around £915. At £40,000, NI moves from around £4,264 to £5,250, adding around £986.
At £50,000 salary, 2026/27 employer NI is around £6,750 compared with about £5,644 under 2024/25 assumptions, a rise near £1,106. At £75,000 salary, NI is around £10,500 versus about £9,094, adding around £1,406. At £100,000 salary, NI is around £14,250 versus about £12,544, adding around £1,706.
The pattern is simple: NI rise per employee generally grows with salary, but lower and mid salaries still face material absolute increases because the threshold fell sharply. For budgeting, run your actual salary mix instead of a single midpoint. A team with many £28k–£38k roles can see significant aggregate impact.
From NI-only to true employer cost: what to include in decisions
NI is only one layer of recurring cost. For realistic hiring decisions, combine salary, employer NI, minimum pension, and your operational overhead assumptions. A £35,000 role can move from a headline salary to a total employer cost in the low-£40k range once statutory and operational components are included.
Auto-enrolment pension is usually modelled at a minimum employer contribution of 3% on qualifying earnings between £6,240 and £50,270. Above £50,270, pension qualifying earnings stop increasing for statutory minimum purposes, but employer NI continues with no upper cap. That shifts the cost mix as salaries rise.
Use monthly-first outputs for approvals and cashflow planning. Managers, finance teams, and founders usually decide faster with a clear monthly number plus annual total. If your process is still gross-salary-first, payroll pressure tends to appear late in the quarter when commitments are already made.
How to use this as an NI rise calculator in practice
Step 1: model the role at current 2026/27 settings (15% above £5,000). Step 2: compare against 2024/25 baseline logic (13.8% above £9,100). Step 3: add pension and overhead assumptions. This gives a clean year-on-year variance you can use in budget notes, board packs, and offer sign-off.
Step 4: run the same salary with and without Employment Allowance where relevant. For eligible small employers, allowance can materially reduce net NI payable in-year. For larger payrolls, allowance may only offset an early part of annual liability, so do not assume the relief eliminates NI rise impact.
Step 5: document assumptions in plain English: tax year, threshold, NI rate, pension basis, allowance treatment, and overhead rule. Most reporting disputes come from assumption mismatch rather than calculation errors. A documented assumptions line makes finance, HR, and payroll conversations materially faster.
Common mistakes to avoid in 2026/27 employer NI planning
Mistake one is using old thresholds in spreadsheets or offer calculators. A model still using £9,100 as secondary threshold will understate NI in 2026/27. Mistake two is quoting NI-only cost to hiring managers without pension and overheads, which causes recurring under-budgeting across multiple hires.
Mistake three is treating Employment Allowance as automatic. Eligibility still matters, and some company structures are excluded. Mistake four is assuming NI behaves like employee NI with an upper-rate reduction. Employer NI does not taper at higher salaries; 15% continues above threshold with no upper limit.
Mistake five is not refreshing planning pages in search and internal docs. If your team searches terms like “employer ni calculator 2026/27” or “ni rise calculator”, make sure they land on updated, assumption-led pages. Good decisions come from current-year inputs, consistent assumptions, and clear monthly outputs.
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