As of 13 August 2026, AI can only partly calculate employer National Insurance contributions.
This still needs a person who signs their name to it.
Can you do it?
5 minutesto a draft.
30 minutesto something you’d act on.
Cost, all in£0
Skill neededchat-fluent
Who has to check ita professional
What the alternative costsThe supplied tool data does not give a price for a payroll alternative.
If this goes wrong, your payroll and employer National Insurance figures can be wrong and you remain responsible for correcting the records and submissions.
What to actually do
Hand it to a person
The route this page recommends
Someone with a licence or accountable authority has to sign this before it counts.
Use a tool built for this
Second choiceDo it yourself
The distant thirdA chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.
How to actually do it
- Open the GOV.UK guidance for employer National Insurance rates and thresholds for [tax year], and copy the applicable rates, thresholds, employee categories and employer relief rules.
- Export the payroll register for the relevant pay period, remove unnecessary personal details, and retain an internal employee identifier, gross earnings, pay frequency, director status where relevant, and any relief or exemption information.
- Paste the official GOV.UK rules and the payroll table into the prompt, filling in the tax year and checking that every employee has a category and pay period.
- Ask the model to calculate each employee's employer contribution and the total, showing the threshold, rate and arithmetic rather than giving only a final figure.
- Compare each drafted calculation with the pasted GOV.UK rules and recalculate a sample of employees manually, including any director, category, relief or exemption case.
- Reconcile the total with the payroll software or payroll register, ask a payroll accountant to resolve any flagged exception, and only then use the confirmed figures for the employer's payroll and RTI process.
Prompt
Calculate the UK employer National Insurance contributions for the payroll data below. Use only the official GOV.UK rates, thresholds and rules that I paste after this instruction for tax year [tax year]. Do not rely on memory, infer missing rules, or calculate employee deductions. If the supplied rules or data are incomplete, list exactly what is missing instead of guessing. Show the calculation for each employee and pay period, including the relevant earnings band, threshold, rate, relief or exemption applied, employer contribution, and total. State any assumptions separately. Then provide a reconciliation that I can compare with the payroll register. Flag any employee category or situation that needs a payroll accountant to confirm. Official GOV.UK rates and rules: [Paste the relevant GOV.UK employer National Insurance rates, thresholds and guidance here] Payroll data: [Paste a table containing employee identifier, pay period, gross earnings, pay frequency, employee category, director status where relevant, and any employer relief or exemption information] Return the result in a table. Keep all figures in pounds to two decimal places. Do not submit anything to HMRC or present this as professional advice.
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
What it gets wrong
- AI cannot know whether your payroll data contains the correct employee category, director treatment or relief status.
- AI cannot guarantee that rates and thresholds are current unless you supply the relevant GOV.UK guidance.
- AI cannot take responsibility for the employer's payroll records, RTI submissions or corrections.
- AI cannot replace a payroll accountant when an employee has an unusual status, multiple employments or a disputed calculation.
- A plausible total can still conceal one wrong threshold or rate, so the arithmetic needs reconciliation against payroll records.
What caps this at PARTLY: legal accountability, real time truth and verification cost.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 1 |
| Verification | 1 |
| Liability | 1 |
| Effort delta | 2 |
| Total | 7 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT calculate employer National Insurance?
- Partly. It can apply the UK rates and thresholds you provide to payroll figures and show the arithmetic, but it cannot confirm that your employee categories, reliefs or source data are correct. Check the result against current GOV.UK guidance and your payroll records.
- Can AI calculate employer National Insurance for multiple employees?
- Yes, for a structured payroll table with the tax year, pay frequency, employee category and gross earnings included. It may mishandle exceptions or silently use an incorrect rule, so reconcile the total and have a payroll accountant check unusual cases.
- Can AI submit employer National Insurance to HMRC?
- No. A chatbot can prepare calculations, but it does not take responsibility for your payroll or submit your employer's RTI records. The employer remains accountable for the figures sent to HMRC.
- Is it safe to use AI for employer National Insurance calculations?
- It is suitable as a calculation aid when you paste the current GOV.UK rules and use non-sensitive, accurate payroll data. This is not professional advice, and a serious or unusual payroll case needs a payroll accountant to verify the calculation before submission.
Nearby answers
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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