UK P45 P60 P11D Complete Guide 2026/27

Q What is a P45 and when do I receive it?

P45 = "Details of Employee Leaving Work". Statutory form issued by employer when employment ends. Required by SI 2003/2682 Regulation 36. When issued: (1) Voluntary resignation: employer must provide on or before last working day. (2) Dismissal: same timing. (3) Redundancy: with redundancy paperwork. (4) Retirement: with pension paperwork. (5) End of fixed-term contract: on contract end date. Form structure - 3 parts in old paper format: Part 1: employer sends to HMRC electronically via RTI (Real-Time Information). Modern process - employee never sees Part 1. Part 1A: FOR YOUR RECORDS - keep this. Shows your pay + tax to leaving date. Part 2: give to new employer when starting new job. Part 3: also goes to your new employer, with Part 2. Modern electronic P45: many employers email PDF or post all 3 parts to ex-employee. Key information on P45: (a) Employer name + PAYE reference. (b) Employee name + NINO. (c) Leaving date. (d) Tax code at leaving. (e) Pay to date in tax year. (f) Tax deducted to date. (g) Student loan plan + amount deducted. (h) Week 1 / Month 1 indicator. What to do with P45: (1) Give Part 2 + 3 to new employer: they apply correct tax code + cumulative tax to date. Prevents emergency tax. (2) Keep Part 1A safely: for tax records + SA filing. (3) If between jobs: keep all parts safe. Use when starting next job. (4) If leaving UK / going self-employed: trigger for P85 (leaving UK) or SA registration. If employer fails to provide P45: (1) Request in writing. (2) Escalate to HMRC employer compliance team: 0300 200 3200. (3) HMRC can charge the employer a penalty of up to £300, plus up to £60 a day if the failure continues after that penalty is imposed (TMA 1970 s.98(1)(b), which covers PAYE regulations; these are maximums, not fixed amounts). (4) New employer uses Starter Checklist as backup - puts you on emergency tax code temporarily.

Q What is a P60 and when do I receive it?

P60 = "End of Year Certificate". Annual summary of pay + tax deducted by employer. Required by SI 2003/2682 Regulation 67. When issued: (1) By 31 May following end of tax year. So the 2026/27 P60 is due by 31 May 2027. (2) For employees in employment on 5 April: must receive P60. If you left before 5 April, you get P45 instead. Format - electronic or paper: (a) Electronic (most common): PDF emailed or downloadable via payroll portal (ADP, Sage, Xero, Workday). (b) Paper: still legal, less common. Key information on P60: (1) Employer name + PAYE reference. (2) Employee name + NINO. (3) Tax year ending 5 April. (4) Total pay this employment. (5) Total tax deducted. (6) Final tax code. (7) Statutory pay (SSP / SMP / SAP / SPP / ShPP). (8) Student loan deductions by plan. (9) Pension scheme contributions. (10) NIC payments by category. (11) Previous employment data if mid-year switch. Critical uses of P60: (1) Self Assessment filing: official figures for SA return. (2) Tax refund claims (P800 / WFH / FRE): provides historical record. (3) Mortgage applications: lender's standard income verification. (4) Loan / credit applications: income proof. (5) Universal Credit / Tax Credit calculations: actual annual earnings. (6) Personal tax record: track lifetime earnings, NIC contributions. (7) Visa applications: income evidence for UK visa renewals. (8) Rental applications: landlord income verification. (9) Maternity / paternity calculations: SMP/SPP rate setting. (10) Divorce / separation: financial disclosure evidence. If employer fails to provide P60: (1) Request in writing. (2) HMRC can charge the employer a penalty of up to £300, plus up to £60 a day if the failure continues after that penalty is imposed (TMA 1970 s.98(1)(b); these are maximums, not fixed amounts). (3) Personal Tax Account shows similar data: gov.uk/personal-tax-account → PAYE income → tax year summary. NOT a P60 but equivalent factual record. Lost P60 - 3 options: (a) Ask employer for reissue: most can reproduce within days. (b) Personal Tax Account download: shows pay + tax + employer details. (c) HMRC issued letter: 0300 200 3300, request "employment income confirmation" letter.

Q What is a P11D and who receives it?

P11D = "Return of Benefits + Expenses". Report of Benefits in Kind (BIK) + non-cash perks employer provides. Required by regulation 85 of the Income Tax (PAYE) Regulations 2003 (SI 2003/2682). When issued: (1) By 6 July following end of tax year for benefits received in that year. So the 2026/27 P11D is due by 6 July 2027. (2) Only if you received P11D-reportable benefits: not every employee gets P11D. Who receives P11D: employees whose employer provided non-cash benefits including: (a) Company car: including a car taken through salary sacrifice, which is a taxable car benefit (an electric car is 4% in 2026/27) unless the employer payrolls it. (b) Company car fuel: separate benefit. (c) Private medical insurance: BUPA, Vitality, AXA. (d) Accommodation: if employer-provided + not exempt. (e) Beneficial loans above £10,000: cheap-interest BIK. (f) Childcare vouchers (legacy schemes): above qualifying amount. (g) Mobile phone (above 1 device): 2nd phone is BIK. (h) Living accommodation rent paid by employer. (i) Subscriptions / club memberships: gym, country club. (j) Director / employee personal incidental expenses. What's NOT on P11D (tax-exempt): (a) Employer pension contributions: exempt under Section 308 ITEPA 2003. (b) Trivial benefits under £50: Section 323A ITEPA 2003. £300 annual cap for directors. (c) Workplace pension auto-enrolment: not a benefit. (d) Cycle to Work scheme: exempt under Section 244 ITEPA 2003. (e) Mobile phone (1 device per employee). (f) Workplace nursery (employer-run). P11D form layout: lists each benefit category + "cash equivalent" value. Lettered sections cover the different benefit types. What to do with P11D: (1) Check for errors: tax code adjusts based on P11D - errors mean wrong tax. (2) Cross-check against employer's payroll: company car details, BUPA premium. (3) Self Assessment: benefits are normally taxed through your tax code. There is no benefits-value or £100,000 income test for filing a return; you need one only if a gov.uk criterion applies, such as sole-trader income over £1,000 or Capital Gains Tax to pay (GOV.UK). (4) Keep for 4-6 years: HMRC review window. (5) Compare year-on-year: benefits may have changed. P11D(b) declaration: separate form employer files with HMRC by 6 July declaring TOTAL Class 1A NIC due. Employee doesn't see this normally. Class 1A NIC: 15% employer-only NI on total BIK value. Due 22 July (electronic) / 19 July (postal).

Q P45 vs P60 vs P11D - what is the difference?

3 forms, 3 different purposes, 3 different timings: P45 - EMPLOYMENT ENDING: (a) When: at end of employment (resignation, dismissal, redundancy, retirement). (b) Purpose: tells next employer / HMRC your pay + tax to date. (c) Content: pay + tax to leaving date, tax code, NINO, leaving date. (d) Recipient: ALL employees on leaving. P60 - END OF TAX YEAR: (a) When: by 31 May following 5 April tax year end. (b) Purpose: confirms total annual pay + tax for SA / mortgage / records. (c) Content: total pay + tax + NI + student loan for the tax year, final tax code, employer details. (d) Recipient: ALL employees employed on 5 April. P11D - BENEFITS IN KIND: (a) When: by 6 July following 5 April tax year end. (b) Purpose: reports non-cash benefits + expense reimbursements. (c) Content: company car CO2 value, BUPA premium, beneficial loan interest, accommodation, share schemes. (d) Recipient: ONLY employees receiving reportable benefits. Timeline for the 2026/27 tax year: 5 April 2027: tax year ends. By 31 May 2027: P60 issued for active employees. By 6 July 2027: P11D issued where applicable + P11D(b) filed with HMRC. 22 July 2027: employer pays Class 1A NIC on benefits. 31 January 2028: online SA return for 2026/27 due (uses P60 + P11D data). 5 April 2028: deadline to claim refunds for 2023/24. Common confusion: (1) "Got my P60 but no P11D": normal if no benefits. Most employees don't get P11D. (2) "P11D total differs from P60": correct - P60 shows cash pay, P11D shows benefits. Both fed into total income for SA. (3) "Multiple P45s in a year": if you changed jobs multiple times. Use latest P45 with new employer. (4) "P45 and P60 from same employer": P45 if left mid-year (no P60); P60 if employed on 5 April (no P45). One or other, not both, per employer per tax year. (5) "Different tax code on P45 vs new employer's first payslip": normal during transition. Settles within 1-2 payslips.

Q I lost my P60 - how do I get a replacement?

Lost P60 - 3 main recovery routes: Route 1 - Ask employer (FASTEST): (a) Request reissue from payroll department: most can reproduce in 24-72 hours. (b) Email request preferred: paper trail. (c) Modern payroll systems (ADP, Workday, Sage) often keep records longer than the legal minimum. (d) Small employers: may take longer but legally must keep records 3+ years. (e) Former employer: must keep PAYE records for at least 3 years after the end of the tax year they relate to (regulation 97 PAYE Regulations 2003). (f) Free of charge: employer cannot charge for reissue. Route 2 - Personal Tax Account (RECOMMENDED): (a) gov.uk/personal-tax-account: log in with Government Gateway. (b) Navigate to "Pay As You Earn (PAYE)" → "View your PAYE income". (c) Select relevant tax year. (d) View employer-by-employer breakdown: pay, tax, NIC, student loan, tax code. (e) Download as PDF: not technically a P60 but contains all same data. (f) HMRC certifies this as equivalent for most purposes - mortgage lenders accept. (g) Goes back many years: typically full PAYE history available. Route 3 - HMRC employment confirmation letter: (a) Phone 0300 200 3300: HMRC Income Tax helpline. (b) Request "employment income statement" or "tax year overview". (c) HMRC posts letter: 7-14 days. (d) Free of charge. (e) Accepted by most third parties: mortgage lenders, visa applications, courts. Use case priority: (a) Mortgage application: most lenders prefer P60 PDF from Personal Tax Account. Some require physical P60 - ask employer. (b) Self Assessment: PAYE figures from Personal Tax Account suffice. (c) Visa renewal: HMRC letter typically required. (d) Court case: HMRC letter accepted as evidence. (e) Tax investigation: HMRC has the data anyway. Common pitfall: assumption that ex-employer doesn't keep records. They do - by law. Politely persistent request usually works. If employer ceased trading: (a) Companies House search: confirms status. (b) HMRC retains employer's RTI data: contact HMRC directly for confirmation letter. (c) Liquidator (if formal insolvency): may hold payroll records temporarily.

Q What do mortgage lenders want from a P60?

Mortgage lenders use P60 as primary annual income verification. Standard mortgage documentation request: (1) Last 2-3 years' P60s: confirms stable income trend. (2) Last 3 months' payslips: recent earnings + variable pay. (3) P11D if benefits: lender adds BIK to income calculation. (4) Bank statements 3 months: corroborates pay + spending. (5) SA302 if self-employed: separate documentation. What mortgage lenders look for on P60: (a) Total pay vs declared: must match application form. (b) Tax + NI deductions: confirms PAYE pattern. (c) Year-on-year growth: ideally stable or rising. (d) Tax code suffix: 1257L (standard), BR (multiple jobs), K (negative allowance). K codes may trigger underwriter questions. (e) Statutory pay: SMP, SSP, SPP may reduce lendable income (lender may exclude these). (f) Pension contributions: large pension contributions = lower lendable income (depending on lender policy). (g) Student loan deductions: subtracted from take-home for affordability assessment. Common mortgage P60 issues: (1) "P60 shows lower than expected": pension salary sacrifice reduces P60 figure. Some lenders add back; others use P60 as-is. (2) "Multiple P60s same year": changed jobs - sum P60s for total income. Lender may want explanation. (3) "Recent job change + low P60": P60 only shows partial year. Lenders typically want continuous 3 months in new role + last full year P60 from previous job. Probation period (typically 6 months) may delay mortgage approval. (4) "Bonus on P60 but not on payslip": variable income reduces lendable amount typically 50% of average bonus. (5) "Self-employed income alongside PAYE": SA302 + P60 both required. Affordability uses combined. (6) "P60 from foreign employer": most UK lenders won't accept - need UK employment history typically. (7) "Statutory maternity pay on P60": lender may exclude Statutory Maternity Pay (SMP) from affordability or apply percentage discount. Strategic tips: (a) Keep originals + digital copies of last 3 P60s. (b) Annotate any one-off items: redundancy payment, bonus, settlement. (c) Reconcile P60 to bank deposits: identify discrepancies. (d) Match across all evidence: P60 + payslips + bank statements consistent. (e) Be prepared to explain: large pension contributions, salary sacrifice, equity awards. Modern lenders: Open Banking integration may replace some P60 requirements (HSBC, Atom Bank). Still useful to have on hand.

Q What are the common P11D errors and how do I fix them?

P11D errors are common + can cost £hundreds in wrong tax. Common P11D errors: Error 1 - Company car value wrong: Cause: employer used wrong list price (forgetting accessories), wrong CO2 g/km, wrong year's BIK %. Effect: tax code adjusts by wrong amount. Fix: cross-check against manufacturer / dealer documentation. P11D box 4 list price + box 16 CO2. Error 2 - BUPA / medical insurance shows wrong: Cause: full year value reported despite mid-year start, or family vs individual cover misreported. Effect: typically overstates BIK. Fix: get premium statement from insurer. Error 3 - "Cheap loan" reported when actually exempt: Cause: relocation loan or season ticket loan can be exempt under specific rules; or below £10k - cheap loan exemption. Effect: unnecessary BIK. Fix: review loan documentation + the £10,000 threshold in Section 180 ITEPA 2003. Error 4 - Trivial benefits incorrectly on P11D: Cause: benefit under £50 wrongly reported. Effect: unnecessary tax. Fix: Section 323A ITEPA 2003 exemption - employer should remove from P11D. Error 5 - Salary sacrifice value reported on P11D: Cause: post-April 2017 OpRA rules say sacrificed cash compared to BIK - higher figure used. Employer may report incorrectly. Effect: tax based on wrong value. Fix: detailed OpRA calculation review. Error 6 - Reimbursed expenses incorrectly shown: Cause: pre-April 2016 dispensation rules misapplied. Current rules: most reimbursed business expenses fully exempt. Effect: appears as BIK when it isn't. Fix: exemption under Section 289A-289D ITEPA 2003. Error 7 - Mileage allowance overstated: Cause: employer paid below Approved Mileage Allowance Payments (AMAP) rates - should be employee MAR claim not employer P11D. Effect: missed tax relief. Fix: claim MAR separately via P87. How to fix P11D errors: Step 1 - Identify error: review P11D vs source documents. Step 2 - Contact employer payroll: request amended P11D. Step 3 - Employer files amended P11D + P11D(b) with HMRC: tax code reissued. Step 4 - If employer disputes: write to HMRC directly with evidence. (a) Explain error. (b) Provide supporting documents. (c) Request tax code adjustment + repayment if overpaid. Step 5 - Time limits: (a) Employer amend P11D: up to 4 years after tax year end. (b) Employee claim refund via SA: 4 years after tax year end (Section 43 TMA 1970). (c) HMRC claw back unpaid tax: 4 years ordinarily (TMA 1970 s.34), 6 years if the loss was careless, 20 years if deliberate (s.36). Strategic action: (a) Cross-check P11D within 30 days of receipt. (b) Escalate quickly if error. (c) Document everything: emails to payroll, HMRC correspondence. (d) Track tax code changes: confirm fixes propagated to PAYE.

Q What is a Starter Checklist and when do I need one?

Starter Checklist (formerly P46) - used when employee starting new job WITHOUT P45 from previous employer. When used: (1) First job: no previous employment. (2) Lost P45: previous employer hasn't issued / lost. (3) Multiple concurrent jobs: starting 2nd / 3rd job. (4) Gap between jobs longer than tax year: P45 from very old job not useful. (5) Self-employed previously: no P45. (6) Returning from abroad: no UK P45. (7) Returning from career break: previous P45 stale. Starter Checklist 3 statements: Statement A: "This is my first job since 6 April + I haven't received state pension or taxable benefits". Employer uses standard tax code 1257L cumulative. Statement B: "This is my only job since 6 April but I had other taxable income during this tax year". Employer uses 1257L Week 1 / Month 1 basis (non-cumulative). Statement C: "I have another job / receive State Pension / taxable benefits". Employer uses BR tax code (basic rate 20% on all earnings, no PA). How it works: (1) Complete Starter Checklist on first day: via new employer's HR system. (2) Submit with P45 if you have one: not mutually exclusive. (3) Employer applies tax code based on selection. (4) HMRC adjusts code via RTI data: typically within 1-2 weeks. (5) First payslip may be on emergency tax code: 1257L W1/M1 - corrects with cumulative once HMRC updates. Implications of each statement: Statement A: full Personal Allowance from start. Most tax-efficient. Statement B: PA applied prospectively only - any tax owed from prior earnings collected via SA or P800 reconciliation later. Statement C: 20% tax on all earnings, no PA. PA applied to other job. Refund possible if other job didn't fully use PA. Common errors: (a) Wrong statement selected: e.g., choosing A when actually had prior taxable benefits = under-taxation now, owing later. (b) Multiple jobs not properly declared: leads to allocation issues. (c) State Pension recipients: must select C if also working. (d) Pension from prior employer: technically other taxable income - must select B or C. Fix if wrong tax code: (1) Personal Tax Account: gov.uk/personal-tax-account - check tax code. (2) Update employments + income sources: HMRC reissues code. (3) End-of-year reconciliation: P800 letter shows refund / underpayment. (4) Self Assessment: if complex multiple jobs / income sources.

Q How do P45 and P60 work if I have more than one job?

Multiple concurrent jobs complicate PAYE forms. One P60 per active employment per tax year: 3 jobs at 5 April = 3 P60s. Personal Allowance allocation: (a) Default: full PA to "main job" (typically highest-paying or longest-tenure). Other jobs taxed at BR. (b) Optimisation: contact HMRC to split PA across jobs if it improves overall tax position. (c) Income tax stacking: total income from all jobs determines band - HMRC reconciles via P800 letter after year end if you crossed band thresholds. Worked example - 2 jobs, £20k + £15k: Total £35k: within basic-rate band. Default coding: (1) Job 1 (£20k): code 1257L. PA covers £12,570. Tax (20% × £7,430) = £1,486. (2) Job 2 (£15k): code BR. Tax 20% × £15,000 = £3,000. Total tax: £4,486. Class 1 NI: charged separately in each job, £594.40 + £194.40. Take home: £29,725.20. Alternative - split PA: (1) Job 1 (£20k): PA partial £7,570, code 757L. Tax (20% × £12,430) = £2,486. (2) Job 2 (£15k): PA partial £5,000, code 500L. Tax (20% × £10,000) = £2,000. Total tax: £4,486. Same. Identical when both basic-rate: split doesn't help. Split optimisation valuable when: (a) One job pushes into higher rate: PA on higher-paying job prevents 40% on PA range. (b) NI optimisation: Class 1 NI thresholds per employer separately = potentially less NI total. P45 when leaving one of multiple jobs: (1) P45 from departing job. (2) Other jobs continue with current tax codes. (3) If keeping ONE job after leaving another: notify HMRC - tax code may need adjustment from BR to standard 1257L on remaining job. (4) End-of-year: separate P60 from each ongoing employment. Tax-year-end reconciliation: HMRC P800 cross-checks all RTI data. (a) If overpaid: refund cheque or bank transfer. (b) If underpaid (band crossing): coding adjustment future year or SA bill. Strategic considerations: (1) Track all employments on Personal Tax Account. (2) Verify P45 issuance from each leaving employer. (3) Maintain P60s from all current employments. (4) Self Assessment: having more than one job does not by itself require a return; check the gov.uk criteria if you have other income. (5) Pension via salary sacrifice: only at primary employer's scheme typically.

Q Which forms apply if I am employed and self-employed?

Mixed employment / self-employment is common. Each income type has different paperwork: (1) Employment income: P60 each year, P45 on leaving, P11D for benefits. (2) Self-employed income: Self Assessment SA100 + SA103 + invoices + bank records. When a return is required (GOV.UK criteria): (a) Sole-trader income over £1,000. (b) Partner in a business partnership. (c) Capital Gains Tax to pay. (d) High Income Child Benefit Charge (HICBC) owing and not paid through PAYE. (e) Off-payroll worker repaying a student or postgraduate loan. You may also need one for untaxed income such as rent, tips, commissions, savings interest, dividends or foreign income. There is no PAYE or combined-income threshold: the old £150,000 PAYE-income test no longer applies, and any sole-trader income over £1,000 needs a return whatever your salary. How forms interact: SA102 - employment pages: enter the P60 figures (pay + tax), plus benefits from the P11D and any expense claims. SA103S / SA103F - self-employment: gross income, allowable expenses, profit. SA100 - main return: savings, dividends, pension contributions and Gift Aid. Capital gains schedule: SA108. Tax computation: SA combines all into single calculation. PA applied once. Bands applied to total. Worked example - £35,000 PAYE + £15,000 self-employed profit: P60: £35,000. SA103S: £15,000 profit. Total income: £50,000. PA: £12,570. Taxable income: £37,430 - all in basic band. Income tax: 20% × £37,430 = £7,486. PAYE already deducted (P60, code 1257L all year): £4,486. Income Tax balance: £3,000. PLUS Class 4 NI on SE profit: 6% × (£15,000 - £12,570 Lower Profits Limit) = £145.80. The Lower Profits Limit is a test on the self-employed profit alone; the Personal Allowance used by the job does not change it. Class 2 NI: no longer compulsory; you can pay it voluntarily to protect State Pension entitlement where profits are below the Small Profits Threshold. Total SA bill: £3,145.80. Payments on account: because this is over £1,000 and less than 80% of the total was collected at source, the next year also needs 2 payments on account of 50% each (£1,572.90), due 31 January and 31 July; the first is paid with this balance (GOV.UK). Paying through your tax code: possible only if you owe less than £3,000 and file online by 30 December (paper by 31 October), so this £3,145.80 bill could not be coded out (GOV.UK). Class 1 employed + Class 4 self-employed NI: annual maximum rules can limit the combined total for higher earners. Pension contributions: claim higher-rate relief via SA on personal pension contributions (if not via salary sacrifice).

Q What forms do I need when leaving the UK?

Leaving UK permanently or for extended period - P85 form required. P85 = "Leaving the UK + tax purposes": notify HMRC + claim refund if any. When to file P85: (1) Permanently emigrating from UK. (2) Going abroad for full tax year: 6 April-5 April. (3) Going abroad for at least one complete tax year + you've left UK before 6 April. (4) Extended assignment abroad for employer: complex - check residency tests. (5) Career break abroad. NOT for short trips: holidays, brief assignments. P85 process: Step 1 - Get final P45 from UK employer: send Part 2 + 3 with P85. Step 2 - Complete P85 form: online via Personal Tax Account or paper PDF. Information needed: (a) Date of departure. (b) Country of destination. (c) Reason for leaving: permanent, work, retirement. (d) UK address (forwarding): usually family / accountant. (e) Foreign address (if known). (f) Bank account for refund: UK preferred (foreign bank often complex). (g) Final salary details (matches P45). (h) UK property held (rental etc.). (i) UK income sources continuing after departure: rental, savings, pension. Step 3 - Submit + P45 attached. Step 4 - HMRC processes refund: typically 4-12 weeks. Step 5 - Tax code updated: NT (no tax) code applied to continuing UK income sources if non-resident. Tax refund calculation: (1) The Personal Allowance is NOT apportioned: it is an annual allowance (ITA 2007 s.35), and you get the full £12,570 if you are UK resident for the year, including a split year, or meet another s.56 condition such as being a UK national. (2) Tax overpaid: PAYE only gives you the allowance month by month, so by your leaving date it has used part of it; the unused part becomes a refund if you have no more UK income that year. (3) Refund: cheque or bank transfer. Worked example - left UK 30 September 2026 (month 6) on £40,000 a year, no further UK income: Pay to leaving: £20,000 (6 months). PAYE deducted to month 6 (code 1257L, cumulative): about 20% × (£20,000 - 6/12 of £12,570) = about £2,743. Tax actually due for the year (full £12,570 allowance): 20% × £7,430 = £1,486. Refund: about £1,257. The earlier in the tax year you leave, the more of the allowance is unused and the larger the refund. Class 1 NI is not refunded: it is worked out pay period by pay period. Continuing UK obligations after departure: (a) Tax on UK rental income: ongoing - Non-Resident Landlord Scheme. (b) Tax on UK pension: subject to DTA with new country. (c) UK savings interest: tax-free after non-resident usually. (d) UK dividends: 0% tax (disregarded income) usually. (e) UK property gain on disposal: NRCGT - 60-day reporting required. (f) Final SA filing: 31 January after year of departure. Statutory Residence Test: confirms non-resident status going forward. See /uk-residence-srt-guide.

Q What PAYE forms should I check each year?

Annual PAYE forms compliance checklist: (1) Set up Personal Tax Account: gov.uk/personal-tax-account. Verify with NINO + ID. Enable 2FA. (2) Save digital copies of every P60: scan / PDF / cloud backup. Lifetime record. (3) Save P45 part 1A on leaving any job: even if you have a new job. (4) Cross-check P11D within 30 days: BIK accuracy. (5) Verify tax code monthly: payslip vs Personal Tax Account. Investigate discrepancies. (6) Track all employments: PTA → Employments section shows full history. (7) Reconcile P60 to bank deposits: end-of-year audit. (8) File Self Assessment if required: 31 January deadline. (9) Claim FRE / professional fees / WFH if eligible: P87 online via PTA. (10) Marriage Allowance application: if applicable + low-income spouse. (11) Pension contribution higher-rate relief: via SA if higher-rate taxpayer + personal pension. (12) Charity Gift Aid higher-rate top-up: via SA. (13) Student loan deductions check: P60 box vs SLC statement. (14) Maintain 6+ years' records: HMRC review window. (15) Use HMRC app: hmrc.gov.uk/app - mobile access to PTA + tax records. (16) Set up scheduled reviews: quarterly tax code check, annual P60 vs SA filing. (17) Mortgage / loan applications: keep 3 years' P60s ready. (18) Job change checklist: get P45, provide to new employer, verify Starter Checklist. (19) Multiple jobs: consider PA optimisation via HMRC. (20) Leaving UK: P85 + final P45 + ongoing income sources notification. (21) Returning to UK: NINO retained, register for tax via PTA, set up Starter Checklist with new employer. (22) Inheriting / passing on tax issues: ensure executors have access to your PAYE records. (23) Tax investigation prep: organised records make HMRC enquiry easier + cheaper. (24) Professional support: accountant for complex affairs - £200-£800/year for SA + ongoing PAYE optimisation. (25) Annual tax planning January: review prior year + plan for new tax year (April 6 reset). Common pitfalls avoided: (a) Lost P60 = mortgage delay. (b) Wrong tax code = surprise bill. (c) Missed P11D error = year+ of wrong tax. (d) No SA registration = penalty. (e) Untracked FRE = lost refunds.