Life Event · Work
Starting a Job in the UK
Whether it\'s your first ever job, your first graduate role, or a major career move, starting a new UK job involves a lot of financial decisions in a short time. Pension choices, salary sacrifice, tax codes, payslip checks — getting them right early saves thousands over your career.
Before You Start: What to Calculate
- Your take-home pay — your headline salary minus income tax, NI, student loan and pension. Use the Take-Home Pay Calculator.
- Auto-enrolment cost— minimum 5% from you, 3% employer. On £30k that\'s about £100/month out of your pay. Many employers offer more.
- Salary sacrifice savings — sacrificing pay into pension saves income tax AND NI. See the Salary Sacrifice Calculator.
- Holiday entitlement — UK statutory minimum is 5.6 weeks (28 days for full-time). Many employers offer more.
Day-One Checklist
- ✓Provide P45 or Starter Checklist — gives employer your tax code and prevents emergency tax
- ✓Confirm pension auto-enrolment — most employees are auto-enrolled after 1–3 months. Don\'t opt out unless you absolutely must
- ✓Confirm student loan plan — Plan 1, 2, 4 (Scotland) or 5 (post-2023) — get it wrong and you may overpay
- ✓Check benefits — private healthcare, dental, cycle-to-work, EV scheme, share options. Many add huge value tax-efficiently
- ✓Set up GovGateway / Personal Tax Account — needed to view tax code, NI record, P60s
- ✓Update HMRC if moving — for council tax + accurate tax code
First Payslip Sanity Check
When your first payslip arrives, verify:
- Tax code — should be 1257L for most. If it has W1, M1 or X suffix, you\'re on emergency tax (will correct itself)
- Gross matches contract
- Income tax + NI match our calculator
- Pension deducted if you\'re auto-enrolled (usually after 1–3 months)
- Student loan deducted if your salary exceeds the threshold
See UK Tax Codes Explained if your code looks unusual.
Pension: Don\'t Opt Out (Almost Ever)
When auto-enrolled, you\'ll get the option to opt out within ~1 month. Don\'t.Opting out means:
- Losing your employer\'s 3%+ contribution (free money)
- Losing 20%/40% tax relief
- Effectively a 16%+ pay cut compared with staying in
The only valid reason to opt out: imminent severe financial hardship. Even then, consider reducing contributions rather than opting out entirely. Read the UK Pension Types Guide.
Maximising Tax-Efficient Benefits
If your employer offers any of these, take them — they save more tax than equivalent cash:
- Salary sacrifice pension — saves IT + 8%/2% NI on the sacrificed amount
- Cycle to Work scheme — bike up to £1,000+ via salary sacrifice (no NI/IT)
- EV car scheme — leasing an EV via salary sacrifice — incredibly tax-efficient (2% BIK)
- Share schemes — SAYE, SIP — buy at discount, tax-advantaged
- Childcare vouchers — only existing schemes (closed to new joiners since 2018; Tax-Free Childcare instead)
- Private medical / dental — taxable BIK but very useful for healthcare access
First Payslip Checklist in Detail
Read every column of your first payslip carefully. The tax codedrives everything: 1257L is standard, BR means basic rate on all earnings (typical for a second job), 0T means no Personal Allowance (used when HMRC has no record of you), a K prefix is negative allowance (taxable benefits exceed your PA, so tax is added to gross), S prefix is Scottish rates and C is Welsh. The suffix W1, M1 or X means "week 1 / month 1" — a non-cumulative emergency basis that often overcharges in early months.
The NI letter should be A for most adult employees, M for under-21s (employer NI is 0% on earnings up to £50,270, but the employee still pays 8%), C if you have deferred liability (a second job), H for apprentices under 25, or X if you are exempt. Verify the gross matches your contract pro-rata, that pension and student-loan deductions reflect your plan, and that the year-to-date columns make sense — these accumulate as the tax year progresses and are the main way HMRC reconciles your liability if you change jobs.
Auto-Enrolment Opt-Out Window
You have 1 month from the date of enrolment to opt out and get your contributions refunded in full via payroll — both your contributions and the employer's clawback. After that 1-month window you can stop future contributions but anything paid stays locked in the pension until age 55 (rising to 57 in April 2028). Auto-enrolment also re-cycles automatically: every 3 years your employer must re-enrol you, and you must opt out again each time if you do not want to participate. Opting out costs you 3%+ employer contribution and 20-45% tax relief — typically a 16%+ effective pay cut compared with staying in.
Emergency Tax Code in the First Month
If you start a new job without giving your employer a P45 from the previous one, payroll must apply emergency code 1257L W1/M1 (non-cumulative) — taxing each pay period in isolation rather than averaging across the year. The result is over-withholding in months 1-2, particularly if you start mid-year with unused Personal Allowance. Fix it in three ways: hand over your P45 within the first month (preferred); complete a Starter Checklist accurately (statements A/B/C drive the code); or log into your Personal Tax Account at gov.uk during the year and update employment details. HMRC then issues a corrected cumulative tax code (the "K-style" uplift) and refunds excess tax via the next payslip. Otherwise reconciliation comes via a year-end P800 letter.
P60 vs P45 vs P11D — What Each Form Means
- P60: Annual end-of-year summary for the tax year (6 April to 5 April), showing total pay and tax/NI deducted. Issued by 31 May. Keep — needed for mortgages, tax credits, Self Assessment.
- P45: Leaving statement when you change job. 4 parts: Part 1 goes to HMRC, Part 1A is your copy, Parts 2 & 3 go to your new employer so they put you on the correct cumulative tax code from day one.
- P11D: Year-end declaration of taxable Benefits in Kind — company car, private medical insurance, gym membership, interest-free loans over £10,000, accommodation. Issued by 6 July. HMRC uses it to adjust your tax code for the following year so BIK tax is collected through PAYE.
Salary Sacrifice Options to Consider
Salary sacrifice replaces gross salary with an equivalent benefit before tax, saving income tax and NI:
- Pension: the biggest win — saves IT (20-45%), employee NI (8%/2%) and most employers pass on their 13.8% employer NI saving too. Effective relief: 41-56%.
- EV car scheme: Benefit-in-Kind only 3% in 2025/26, rising 1 percentage point per year to 9% by 2030/31. A £60,000 EV at 3% BIK costs a 40% taxpayer just £720 of tax per year.
- Cycle-to-Work: typically £1,000-£3,000 spend limit (varies by employer scheme), saves 32%/42%/47% depending on band, repaid over 12 months.
- Childcare vouchers: closed to new entrants from 4 October 2018 — existing scheme users grandfathered. New starters use Tax-Free Childcare via gov.uk instead.
- ULEV workplace charging: 0% BIK if you charge an electric or plug-in hybrid car at the employer's premises.
Probation Period — Legal Status
UK employment law has no special probationary regime. From day one you have statutory rights to the National Living Wage, statutory sick pay, holiday accrual, pension auto-enrolment, protection from discrimination and whistleblowing, and protection from unauthorised wage deductions. The one big exception is the right to claim ordinary unfair dismissal, which only crystallises after 2 years of continuous service. So during contractual probation (and indeed for the whole first 2 years) an employer can dismiss you for performance with minimal process, provided they pay statutory notice. The contract may say "no notice during probation", but once you have more than 1 month service the statutory minimum of 1 week applies anyway.
Notice Periods — Statutory Scale
Statutory minimum notice from the employer scales with service: 1 week if you have 1 month to 2 years, then 1 additional week per completed year up to a maximum of 12 weeks at 12+ years service. So after 5 years you are entitled to 5 weeks; after 10 years, 10 weeks. The employee only owes 1 week statutory notice regardless of length of service. The contract may specify longer — typically 1-3 months for office roles, 6 months for senior management — and the longer figure prevails.
Payment In Lieu of Notice (PILON) lets the employer end the contract immediately and pay out the notice as a lump sum. Since 6 April 2018 PILON is fully taxable as earnings (income tax and NI), ending the previous concession that allowed the first £30,000 to be paid tax-free under termination payment rules. The £30,000 tax-free band still applies to genuine redundancy compensation that exceeds statutory minimums and to ex-gratia termination payments, but not to PILON.
Common Mistakes to Avoid
- Opting out of auto-enrolment to boost take-home pay. You lose the 3%+ employer match plus 20-45% tax relief — effectively a 16%+ pay cut. Only opt out in genuine financial emergency.
- Not providing a P45 or accurate Starter Checklist. Triggers emergency code 1257L W1/M1, over-withholding in early months. Hand over P45 within 30 days or fix via Personal Tax Account at gov.uk.
- Confirming the wrong student loan plan. Plan 1 vs Plan 2 vs Plan 4 vs Plan 5 vs Postgrad have different thresholds and rates — wrong plan over-deducts thousands. Check your SLC account before signing the new-starter form.
- Ignoring the P11D when assessing total compensation. Private medical, company car or interest-free loan over £10,000 is taxable BIK and reduces effective pay. Read the offer letter and ask HR what the P11D value will be.
- Assuming probation gives the employer extra dismissal rights. They already have them anyway during your first 2 years. Probation just frames performance expectations — it does not change your statutory rights.