Salary in London vs Paris: the same gross is not the same net

Same gross, both systems — the computed table

Take the same number on both payslips (single, no children, standard employee status). Computed on the UK 2026-27 rules and the French 2025 (déclaré 2026) scale:

• £30,000 / 30,000 € gross → UK: ~£2,093/month (84% kept) · France: ~1,796 €/month (72% kept)
• £40,000 / 40,000 € gross → UK: ~£2,693/month (81% kept) · France: ~2,359 €/month (71% kept)
• £60,000 / 60,000 € gross → UK: ~£3,780/month (76% kept) · France: ~3,312 €/month (66% kept)
• £90,000 / 90,000 € gross → UK: ~£5,230/month (70% kept) · France: ~4,681 €/month (62% kept)

Read it right: this is the same face value under two systems — not an equivalence. A London offer usually carries a higher gross for the same role, and London prices then take a bigger bite. The point of this table is the gap between the deduction machines — roughly ten points of take-home.

How each payslip works

UK — two visible deductions. Income tax starts after the personal allowance, then National Insurance adds its slice. That’s (almost) it: no heavyweight pension contribution taken at source — which is why UK nets look generous, and why UK retirement depends far more on what you save yourself (workplace pension, auto-enrolment).

France — contributions first, tax second. Before income tax even enters, ~22–25% of gross leaves as social contributions — funding pension rights, healthcare with minimal out-of-pocket costs, and unemployment insurance. Then income tax applies its progressive scale, softened by household “parts”. Your net is lower; your pre-paid safety net is much thicker.

Neither is a scam and neither is free money: the UK hands you the cash and the responsibility; France takes the cash and hands you the rights. The honest comparison prices in what you’d buy privately in the UK — see the deep-dives on living in London by salary band and French net salary.

The two payslips, decoded line by line

Your first UK payslip has four lines that matter. Tax code (e.g. 1257L): encodes your tax-free allowance — a wrong code on arrival is the classic way new arrivals overpay for months (full guide to PAYE and tax codes). Income tax: deducted cumulatively through the year. National Insurance: its own line, its own thresholds. Pension: auto-enrolment puts you in a workplace scheme by default — your contribution lowers today’s net but is matched by your employer; opting out is legal and usually a mistake. If you studied in England, a student loan line may appear above an income threshold.

Your first French payslip is famously longer — but it’s three blocks, not thirty lines. Block 1: salaire brut. Block 2: cotisations (health, pension by tiers, unemployment, CSG/CRDS) — the ~22–25% wall, listed in detail because each line buys a specific right. Block 3: prélèvement à la source — income tax withheld at a personalised rate. The number that compares to your UK “take-home” is the very last one: net payé. Full walkthrough: French net salary explained.

What the table can’t see — and what moves real offers

• Pension contributions. Our UK figures show net before workplace pension; a typical employee contribution moves take-home down several points — but abandons employer matching if you skip it. French pension rights are already inside the cotisations: nothing more to subtract.
• Health top-ups. France: your employer must co-finance a mutuelle (small payslip line, near-zero out-of-pocket care). UK: NHS is free at the point of use; private top-up insurance is a common perk in tech and finance — worth real money if included.
• The French extras. Many French packages carry a 13th month, tickets restaurant, profit-sharing (intéressement/participation) and RTT days — none of which appear in the headline gross. A “lower” French offer can quietly close half the gap through these lines.
• The employer’s view. For the same cost to the company, France funds more social protection: employer contributions are far heavier than UK employer NI. That’s the structural reason French gross offers LOOK lower — part of your compensation never transits through your payslip.
• Bonus mechanics. UK bonuses are taxed as income at your marginal rate (painful in the £100k–£125k band); French variable pay follows the barème with the same logic. Neither country has a magic “bonus tax” — but the £100k taper makes UK bonus timing genuinely strategic.

Why “the average London salary” lies

City-wide averages mix hedge-fund partners with minimum-wage kitchens; London’s average is inflated by finance the way Paris’s is compressed by its larger public sector. Two consequences: the average overstates what most offers look like, and it understates the spread between sectors — which is precisely where your decision lives. The number that matters is your role × seniority × sector, in each city. Official medians (ONS, INSEE — sources below) are fine for context; they are not a negotiation tool.

The £100k trap vs the quotient familial

The two systems diverge hardest at the extremes — and both mechanisms deserve to be understood, not just name-dropped.

The UK taper, mechanically. Above £100,000 of income, your personal allowance shrinks by £1 for every £2 earned — gone entirely around £125k. Losing allowance WHILE being taxed at the higher rate stacks into an effective marginal rate of roughly 60% on that band: a £110k offer is genuinely much less exciting than it looks, and salary-sacrifice pension contributions become the standard defence. If your offer lands near this band, negotiate structure, not just headline.

The French quotient, mechanically. Taxable income is divided by household “parts” (2 for a couple, +0.5 per child for the first two, +1 from the third), the scale applies to each part, and the result multiplies back. Concretely, computed by the same engine as our table: 60,000 € gross single ≈ 3,312 €/month after tax — the same gross for a one-earner couple ≈ 3,591 €/month. The system literally taxes the same salary less because it feeds more people (a ceiling limits the benefit at high incomes). Nothing remotely similar exists in the UK.

Rule of thumb: high solo earners keep more in London; families keep more in Paris — and childcare then doubles the family effect (see the daily-budget deep-dive and the main comparison).

Translate your offer, don’t convert it

The exchange rate converts money you move, not money you live on. To compare two offers: gross → net in each system (above), then net → life in each city — rent share, transport, childcare, what’s left. That second step is where rents and daily costs flip verdicts. It’s exactly what the Salary Translator automates.