UK · Comparisons · Martin Lewis tax calculator
PayslipIQ vs the Martin Lewis tax calculator — an honest comparison
The MoneySavingExpert tax-code and income-tax calculators, fronted by Martin Lewis, are the best-known consumer tax tools in the United Kingdom — and rightly so. They are accurate, free, well-tested and backed by two decades of trusted money journalism. This page is not an attempt to argue otherwise. It is an honest, side-by-side comparison written for readers who have asked us, directly, “why would I use PayslipIQ when MSE already exists?”.
The short answer
The two tools are aimed at different jobs. MoneySavingExpert is the right tool for modelling what your take-home should be at a given salary and tax code, and for understanding the UK tax system as a body of knowledge. PayslipIQ is the right tool when you already have a specific payslip in your hand, you suspect a line on it is wrong, and you want an instant, line-by-line verdict — with the exact questions to put to payroll.
For most UK workers the honest recommendation is: use both. They are complementary, not competitive.
Where MoneySavingExpert / Martin Lewis wins
We want to be direct about this. There are several dimensions on which the MSE tools are clearly the stronger choice, and we would send a reader there for any of them.
- Authority and trust. Two decades of consistent, consumer-first money journalism. When MSE publishes a tax-code guide, journalists, accountants and HMRC staff all read it. That accumulated trust is not something a new tool should claim to match.
- Breadth of written guidance. Long-form guides covering Marriage Allowance, the High Income Child Benefit Charge, savings interest, pension tax relief, Self Assessment thresholds and dozens of other topics that go well beyond “is this payslip right?”.
- Headline calculator accuracy. The MSE income-tax calculator has been tested by millions of users across multiple tax years. For a stated salary and stated tax code, its take-home figure is the reference number most accountants will themselves quote.
- Free, no signup, no AI in the loop. A simple model with deterministic arithmetic. If you prefer a tool that does no inference and no machine learning, MSE is the cleaner choice.
- Wider mission. MSE is a general-purpose consumer money platform. Energy tariffs, mortgage advice, credit cards, savings rates, cashback — none of which PayslipIQ does or plans to do.
Where PayslipIQ wins
PayslipIQ is a focused tool. It exists to answer one question faster than anything else: “is this specific payslip right?”. On that narrow job it has advantages that a general-purpose calculator cannot easily replicate.
- Image parsing. Upload a photo or PDF of your payslip. PayslipIQ extracts gross pay, tax code, NI category, deduction lines and net pay without you having to type any of them in. That removes the most error-prone step in any “check my payslip” workflow.
- Line-by-line verdict. Each deduction is shown with the expected 2026/27 figure, the observed figure on the payslip and the variance. You do not just see a single take-home estimate — you see exactly which line, if any, is the cause of a discrepancy.
- AI plain-English explanation. Once parsed, the tool writes a short summary of what your payslip is doing and the exact questions to put to payroll if anything looks off. The model is anchored to the parsed numbers, not free-floating.
- Dedicated checker pages per scenario. Wrong tax code, emergency tax refund, pension deduction, student loan deduction, overtime tax, P60 reconciliation, umbrella payslip, agency worker payslip and employer NI all have their own focused URLs with their own structured-data markup.
- Named DPIA, TIA and sub-processor list. For payslip uploads — which contain personal data — PayslipIQ publishes a Data Protection Impact Assessment, a Transfer Impact Assessment, a named sub-processor list and a strict CSP. That level of documentation is unusual for a free tool and is documented on the methodology page.
Side-by-side comparison
A factual feature-by-feature comparison. Where MSE wins we say so; where PayslipIQ wins we say so; where the two are equivalent we say that as well.
| Feature | MSE / Martin Lewis | PayslipIQ |
|---|---|---|
| Headline income-tax / take-home model | Excellent. Years of refinement, widely cross-checked, the de-facto reference for UK consumers. | Available, but not the point of the tool. The strength is parsing a real payslip, not modelling a hypothetical salary. |
| Tax-code letter explainer | Long-form written guide, well-indexed, with worked examples for the common letters. | Per-code pages (1257L, BR, 0T, D0, D1, K, M1, NT, S, C and number variants) generated as discrete URLs for direct linking. |
| Parses a payslip image or PDF | Not the product. Users type figures into a calculator. | Yes. Upload a photo or PDF, the tool extracts gross, code, NI category, deductions and net — then reconciles each line. |
| Line-by-line verdict against expected maths | Not the product. | Yes. Each deduction is shown with the expected figure, the observed figure and the variance. |
| AI plain-English explanation | Human-edited articles by a respected money journalist team. | AI-generated, plain-English summary anchored to the parsed values. Useful when you want "explain this to me" rather than "teach me the topic". |
| Umbrella-company and agency-worker support | Covered in long-form guides, not in the calculator UI. | Dedicated umbrella and agency payslip checkers that watch for offshore/disguised remuneration patterns and missing employer NI lines. |
| Per-scenario checker URLs | Single calculator pages. | Dozens of focused checkers (wrong tax code, emergency tax refund, pension deduction, student loan deduction, overtime, P60 reconciliation). |
| Brand authority and trust | Very high. 20+ years of consumer-facing money journalism, regulated by the FCA in the credit-broker function. | A focused new tool. We publish our methodology, sub-processor list, DPIA and TIA — but no claim to MSE-level brand trust. |
| Cost | Free. | Free for the standard payslip check. |
| Account / signup required | No. | No — payslip check runs without signup. |
When to use which
A practical guide based on what readers tell us they were trying to do when they landed on each tool.
- “What will I take home on £42,000?” Use the MSE income-tax calculator. Hypothetical-salary modelling is exactly what it is built for.
- “What does my tax code mean in general?” Either MSE or the PayslipIQ per-code pages. MSE has the long-form essay; PayslipIQ has a dedicated URL per code with worked examples and structured data.
- “Is the deduction on this payslip right?” Use PayslipIQ. Upload the slip; it is parsed line by line and you get the variance per row.
- “Why did my net pay drop this month?” Use PayslipIQ with this month and last month, or use the wrong-tax-code checker if the code letter has changed. A generic calculator cannot tell you what changed; a line-by-line comparison can.
- “Am I owed an emergency-code refund?” Use the PayslipIQ emergency-tax-refund checker for the payslip-specific verdict, and the MSE emergency-tax-code guide for the broader narrative.
- “Should I switch energy supplier?” Use MSE. Out of scope for PayslipIQ — entirely.
Conclusion — use both
MSE is a public good. Its calculators are accurate, free and backed by a level of brand authority no specialised tool should try to displace. PayslipIQ does not compete with that; it does a narrower job — parsing a real payslip and telling you which line is wrong — that the MSE calculator is not designed to do.
The honest answer to “which one should I use?” is usually “both”. Run MSE for the headline; run PayslipIQ for the payslip; cross-reference; and then ring payroll with the specific questions you now know to ask.
Frequently asked questions
- Is the Martin Lewis tax calculator accurate?
- The MoneySavingExpert / Martin Lewis income-tax and tax-code calculators have been published and refined for many years and are widely trusted by UK consumers. For their stated purpose — converting a gross salary into a headline take-home figure under standard assumptions — they are accurate and well-tested. They are not designed to read a specific payslip image, parse the deductions on it line by line or explain why a particular employer figure differs from the model, which is what PayslipIQ adds.
- Should I use PayslipIQ or the Martin Lewis tax calculator?
- Most UK workers benefit from using both. MoneySavingExpert is the right tool for understanding the headline numbers — what a £30,000 or £45,000 salary should produce in take-home pay, or what a given tax code letter means. PayslipIQ is the right tool when you have an actual payslip in front of you and want every line of it parsed, compared to the model and explained in plain English.
- Does PayslipIQ replace Martin Lewis?
- No, and it is not intended to. MoneySavingExpert has 20+ years of accumulated guides, regulatory authority and brand trust that no payslip checker should claim to replace. PayslipIQ is a focused tool for one job — turning the photo of a payslip into a line-by-line verdict — and links to the relevant MSE guides where readers want broader context.
- Is PayslipIQ free like the Martin Lewis tax calculator?
- The PayslipIQ payslip check is free to use, with no signup wall on the main /uk/check flow. Educational guides on the site are also free. The MoneySavingExpert calculators are likewise free. Neither tool charges to run the headline calculation.
- Can PayslipIQ parse a photo of my payslip?
- Yes — that is the core difference. PayslipIQ accepts a payslip image (PDF or photo), extracts the gross pay, tax code, NI category, deduction lines and net pay, and produces a line-by-line verdict against the expected 2026/27 PAYE and NI maths. The MoneySavingExpert / Martin Lewis calculators do not currently parse payslip images — they take typed numbers and return a model take-home figure.
Related checkers and guides
- UK payroll & payslip hub
Every PayslipIQ UK guide and the free payslip check.
- Free payslip check
Upload a photo or PDF — get a line-by-line verdict.
- Methodology, DPIA & sub-processors
How the parsing works, where data is processed, what is logged.
- Wrong tax code checker
Guided check for the most common “is my code right?” patterns.
- Emergency tax refund checker
Are you owed a refund because of an M1 / W1 / 0T / BR code?
- P60 reconciliation checker
Cross-checks your year-end P60 against the sum of your payslips.
Last reviewed
Last reviewed:
Next review:
Reviewed each tax year and sooner if either tool changes materially.
Educational guidance only — not regulated tax, financial or payroll advice. Independent comparison; not endorsed by, or affiliated with, MoneySavingExpert or Martin Lewis. Always verify with HMRC or your payroll team before acting.