Same Salary Different Tax: Why Your Take-Home Differs from Colleagues

You find out that a colleague earns exactly the same gross salary as you. Then you compare bank transfers after payday and notice the amounts are different. One of you is clearly taking home more each month, even though the headline salary figure is identical. No one has made a mistake. The UK tax and payroll system is simply designed so that several personal circumstances, entirely unrelated to your salary, can change the amount that ends up in your account.

This comes as a surprise to many workers because income tax and National Insurance are often discussed as if they work the same way for everyone on a given salary. In practice, two people on £35,000 can have very different monthly take-home figures once tax codes, pension arrangements, student loans, and other factors are applied.

This guide covers every meaningful reason why workers on the same gross salary can receive different net pay, explains how each factor affects the deduction, and gives realistic examples so you can see the numbers clearly.

Two workers on the same UK salary can take home different amounts because of differences in their tax code, pension contributions, student loan plans, salary sacrifice arrangements, company benefits, Scottish or Welsh tax residency, Marriage Allowance, multiple jobs, and whether either is on an emergency tax code. None of these are errors. They reflect legitimate differences in personal circumstances that PAYE is designed to accommodate.

Key Takeaways:

• Tax codes vary due to benefits, underpayments, Marriage Allowance, and emergency codes
• Pension contributions reduce take-home but the net cost depends on the scheme type
• Student loans are a major difference between workers on the same salary
• Scottish taxpayers pay different rates from the rest of the UK
• Salary sacrifice reduces gross pay and NI, affecting take-home
• Company benefits reduce your tax code and increase deductions
• Marriage Allowance can add £252 per year to take-home

The Baseline: What Two Identical Workers Would Pay

To understand the differences, it helps to first see what two genuinely identical workers would pay on the same salary. Using a gross annual salary of £35,000 in 2026/27, on a standard 1257L tax code, no student loan, no pension contributions, no salary sacrifice, and resident in England:

Any difference from this figure for another worker on the same salary is explained by one or more of the factors below.

1. Different Tax Codes

A tax code tells your employer how much of your income is tax-free in a given pay period. The standard code for 2026/27 is 1257L, representing the £12,570 personal allowance. But tax codes are assigned individually by HMRC and vary significantly between workers, even those on identical salaries.

Common reasons two workers on the same salary have different tax codes include:

• One has a company car or other taxable benefit in kind, which reduces their personal allowance to collect the benefit tax through PAYE
• One has underpaid tax in a previous year and HMRC is recovering it by reducing their allowance
• One has claimed Marriage Allowance (receiving a partner's transferred allowance), giving them a higher code such as 1383M — though the final tax code may differ because of other adjustments, benefits, underpayments, or allowances
• One is on an emergency code such as 1257L W1/M1 or 0T because HMRC has not yet confirmed their full position
• One has Adjusted Net Income above £100,000 (for example from investment income) causing their personal allowance to taper

The financial impact of a different tax code can be substantial. Compare 1257L with 0T on a £35,000 salary:

Two workers on identical £35,000 salaries can have monthly take-home pay that differs by over £200 simply because of their tax codes. Our complete UK tax codes guide explains every code and what it means for deductions.

2. Pension Contributions

Workplace pension contributions are deducted from pay each month under auto-enrolment. The minimum is 5% employee contribution, but many workers contribute more. If one colleague contributes 5% and another contributes 8%, their take-home pay will differ even on identical gross salaries.

The contribution method also matters. Workplace pension schemes typically operate using one of three methods: Salary Sacrifice, Net Pay Arrangement, or Relief at Source. Under salary sacrifice, the gross salary is reduced before tax and NI are calculated, meaning the actual cost to take-home pay is less than the nominal percentage. Under relief at source, contributions come from net pay after tax has been deducted and the pension provider claims basic rate tax relief from HMRC. Under net pay arrangement, contributions are deducted from gross pay before income tax is calculated. Two workers on the same salary with the same contribution percentage but different scheme types will have different take-home figures.

One worker contributing nothing to a pension and another contributing 8% via salary sacrifice on a £35,000 salary will have a take-home pay difference of roughly £168 per month, even before any other factors are considered. Our pension tax relief calculator shows how contribution rates and methods affect monthly take-home at any salary.

3. Student Loan Repayments

Student loan repayments are collected automatically through PAYE for borrowers whose earnings exceed their plan threshold. A colleague who has no student loan, or whose loan is fully repaid, keeps the full amount that another colleague sends to the Student Loans Company each month.

Student loan repayment thresholds, plans, and associated rules may change between tax years. You should always check against the latest HMRC and Student Loans Company guidance for the most up-to-date information.

The repayment thresholds and rates for 2026/27 are:

On a £35,000 salary, the monthly student loan deductions for each plan are approximately:

• Plan 1: 9% of (£2,916.67 minus £2,241.67) = £60.75 per month
• Plan 2: 9% of (£2,916.67 minus £2,448.75) = £42.17 per month
• Plan 4: 9% of (£2,916.67 minus £2,816.25) = £9.04 per month
• Plan 5: 9% of (£2,916.67 minus £2,083.33) = £75 per month

Two colleagues on £35,000 where one has a Plan 5 loan and the other has no loan differ by £75 per month in take-home pay, purely from student loan repayments. Use our student loan repayment calculator to see the monthly figure for any plan and salary combination.

4. Scottish and Welsh Income Tax

Scotland and Wales operate distinct income tax frameworks. Scottish taxpayers have six income tax bands, with rates that diverge noticeably from the rest of the UK at higher incomes. Welsh income tax follows the same rates as England for 2026/27, but that can change. The prefix S on a tax code indicates a Scottish taxpayer; the prefix C indicates Welsh.

For the 2026/27 tax year, Scottish income tax rates are:

On a £35,000 salary, a Scottish resident pays approximately £5,063 in income tax per year compared with approximately £4,486 for an England resident. That is a difference of roughly £577 per year, or £48 per month in take-home pay, for two colleagues on identical salaries in different parts of the UK. The gap widens further at higher salaries because of Scotland's 42% higher rate threshold, which begins at £43,663 compared with £50,271 in England.

5. Salary Sacrifice Arrangements

Salary sacrifice reduces the gross contractual salary before income tax and NI are calculated. A worker in a salary sacrifice scheme has a lower gross pay on their payslip than a colleague on the same nominal salary who is not in any such scheme. The deductions are calculated on the lower figure, so take-home pay after deductions looks different even though the pre-sacrifice headline salary is the same.

This affects pension contributions, electric car leases, and cycle to work schemes. A worker who has agreed to sacrifice £300 per month into a pension will appear to have a lower gross salary than a colleague on the same contract who makes the same pension contribution through a relief at source scheme. The colleague in salary sacrifice will have slightly higher monthly take-home pay because of the NI saving, even if their pension contributions are identical in gross amount.

Our guide to salary sacrifice explains how the deduction mechanics work and why the take-home difference arises.

6. Taxable Benefits in Kind

A company car, private medical insurance, a fuel benefit, or interest-free loans above £10,000 are taxable benefits in kind. HMRC includes the cash equivalent value of these benefits in the employee's taxable income for the year by adjusting their tax code. The allowance number in the code is reduced by the annual value of the benefit, which means more income tax is collected each month through PAYE.

Two colleagues on £35,000 where one has a company car with a P11D value of £25,000 and a 25% BiK rate (a taxable benefit value of £6,250 per year) will have tax codes that differ by 625 points. The colleague with the car might have a code such as 632L instead of 1257L. Their monthly income tax will be higher by approximately £104, reducing their take-home pay accordingly, even though their gross salary is identical.

The colleague with the company car still has use of the vehicle, which offsets the additional tax cost. But in terms of cash take-home from their salary, they receive less each month than the colleague who has no benefit.

7. Marriage Allowance

Marriage Allowance allows a spouse or civil partner who earns below the personal allowance to transfer £1,260 of their unused allowance to their partner. This increases the recipient's personal allowance to £13,830 for the year, typically giving them a tax code such as 1383M — though the final HMRC tax code may differ because of other adjustments such as benefits, underpayments, or other allowances. The recipient's annual income tax is reduced by £252.

A worker who has claimed Marriage Allowance on the same £35,000 salary pays approximately £21 less income tax per month than a colleague who has not, simply because of their personal circumstances at home. Over a full year that is £252 returned to the recipient that their colleague does not receive.

Many eligible couples do not claim this, which means they are paying more tax than they need to. Claims can be made through the HMRC personal tax account and applied both to the current year and backdated for up to four previous years.

8. Multiple Jobs and Income Sources

A worker with a second job or a significant side income may have a different tax code on their main employment compared with a colleague whose main job is their only income source. If HMRC is aware of additional income, they may adjust the main employment code to collect more tax through PAYE across the year. This reduces the personal allowance available in the main job, which increases monthly deductions and reduces take-home pay.

Additionally, a worker on a second job will have that income taxed under a BR or D0 code with no personal allowance applied. If the colleague does not have additional income, their full personal allowance is available against the single salary. Their deductions on the primary employment income are lower as a result.

9. Emergency Tax Codes

Emergency tax codes are applied when HMRC cannot confirm a worker's full tax position to their employer. Common triggers include starting a new job without a P45, returning to work after a gap, or HMRC not having processed a P45 in time.

It is important to distinguish between different types of emergency codes:

• 1257L W1 or 1257L M1: These are non-cumulative emergency codes. The personal allowance is still applied, but only on a week-by-week or month-by-month basis rather than cumulatively across the year. Unused allowance from earlier in the tax year cannot be carried forward.
• 0T: This code removes the personal allowance entirely. Tax is deducted from the first pound of earnings with no tax-free amount applied. This is a more severe emergency code and produces higher deductions than W1/M1 codes.
• BR: All income is taxed at the basic rate (20%) with no personal allowance applied. This is often used for second jobs but can also appear as an emergency code on a main job.

If one colleague is in their first month of employment on an emergency code and another has been in post for a year on their correct cumulative code, their take-home pay from the same salary can differ by several hundred pounds in that month. The emergency-coded worker will receive a correction once HMRC issues the correct code, but in the short term the difference is real and can be significant.

Our emergency tax refund guide explains how to get overpaid tax returned quickly.

Side-by-Side Comparison: Four Workers on £35,000

The table below shows how the same gross salary of £35,000 produces different monthly take-home pay across four workers with different personal circumstances in 2026/27.

All four workers earn £35,000 per year. Worker A takes home £2,393 per month. Worker D takes home approximately £2,223 per month. The difference of £170 per month is entirely explained by legitimate personal circumstances, none of which involve a payroll error. Over a year, these four workers take home between £26,671 and £28,719 from the same gross salary.

How to Check Your Own Deductions Are Correct

1. Check your tax code on your payslip and at gov.uk/personal-tax-account. Confirm that your code reflects your actual circumstances. If you have a benefit in kind you no longer receive, or an old employer showing as active on your HMRC record, your code may be unnecessarily reduced.
2. Verify your pension contribution rate and scheme type. Confirm your contribution percentage against your scheme documentation. Check whether it is salary sacrifice, net pay arrangement, or relief at source, and whether the deduction is appearing before or after income tax on your payslip.
3. Confirm your student loan plan with the Student Loans Company. Make sure your employer is applying the correct plan threshold. Applying Plan 1 rules to a Plan 2 borrower produces higher deductions than necessary.
4. Check your residency status with HMRC if relevant. If you have recently moved between Scotland and England or Wales, make sure HMRC has your correct address. The S or C prefix on your tax code should reflect where you actually live, not where you used to live.
5. Use a salary calculator to cross-check. Our income tax calculator shows expected deductions for any salary. Our National Insurance calculator verifies NI separately. If your payslip figures differ meaningfully from the calculated results, investigate further.
6. Speak to payroll if a discrepancy remains. If all the above factors match your circumstances but the deduction still looks wrong, raise it with your employer's payroll team with your most recent payslip and the calculator results as reference.

Final Thoughts

The UK PAYE system does not apply a single uniform deduction to everyone on the same salary. Income tax, National Insurance, pensions, student loans, salary sacrifice, company benefits, Marriage Allowance, and regional tax rates all interact differently for each individual. Two people on exactly the same gross salary can legitimately receive monthly take-home pay that differs by several hundred pounds, and none of that is the result of an error.

Understanding the specific factors that affect your own deductions is the most practical way to check whether you are paying the right amount. The most common sources of unexpected deductions are an incorrect tax code and a student loan on the wrong plan. Both are worth checking, since the corrections are straightforward once you know what to look for.

Our income tax calculator shows what your take-home should be for your salary and circumstances. For a line-by-line breakdown of every deduction on your payslip, our PAYE payslip guide covers what each figure means and where to look if something appears wrong. And if you want to understand why your own tax code differs from the standard 1257L, our complete list of UK tax codes explains every variation.

Official Sources and Further Reading

GOV.UK Official Guidance:

• Income Tax Rates and Allowances - Current tax bands and thresholds
• National Insurance rates - Employee and employer NI rates
• HMRC Tax Codes - What your tax code means
• Scottish Income Tax - Scottish rates and bands
• Student loan repayments - Repayment thresholds and plans

This guide provides general information about why workers on the same salary can pay different tax for 2026/27. Individual circumstances vary. For personalised advice about your specific situation, consult a qualified tax adviser or accountant. Always check GOV.UK for current rates and guidance.