UK P45 P60 P11D Complete Guide 2026/27

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: keep for SA registration / tax-refund claim. 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 compel issuance + £300 penalty for employer non-compliance. (4) New employer uses Starter Checklist as backup - puts you on emergency tax code temporarily.

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 2025/26 P60 issued by 31 May 2026. (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 penalty £300 + £60/day continuing. (3) Personal Tax Account shows similar data: gov.uk/personal-tax-account → PAYE income → tax year summary. NOT a P60 but equivalent factual record. (4) Direct Earnings Verification (DEV): HMRC can supply lender / authority with PAYE data without needing employer's P60. 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.

P11D = "Return of Benefits + Expenses". Report of Benefits in Kind (BIK) + non-cash perks employer provides. Required by Section 7-11 ITEPA 2003 + SI 2003/2682 Part 6. When issued: (1) By 6 July following end of tax year for benefits received in that year. So 2025/26 P11D delivered by 6 July 2026. (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 (NOT salary-sacrifice EV under £15k contract). (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) Beneficial loans: cheap-interest above £10k. (k) 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) Salary sacrifice EV under £15k contract: 2% BIK only. (g) Workplace nursery (employer-run). P11D form layout: lists each benefit category + "cash equivalent" value. Sections A-O cover 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) File SA return if benefit pushes you over self-assessment threshold: typically £10k+ in benefits or £100k+ total income. (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).

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. Typical timeline for 2025/26 tax year: 5 April 2026: tax year ends. By 31 May 2026: P60 issued for active employees. By 6 July 2026: P11D issued where applicable + P11D(b) filed with HMRC. 22 July 2026: employer pays Class 1A NIC on benefits. 31 January 2027: SA return for 2025/26 due (uses P60 + P11D data). 5 April 2027: deadline to claim refunds for 2022/23. 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.

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) keep records 6 years - reissue automatic. (d) Small employers: may take longer but legally must keep records 3+ years. (e) Former employer: must keep PAYE records for 6 years after employment ends. Still obligated to provide. (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.

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 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.

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 + Section 175 ITEPA 2003 exemptions. 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 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 (negligent) or 6 years (careless) or 20 years (deliberate). 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.

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.

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. Take home: £30,514. 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) SA may be required if total income above £100k or complex sources. (5) Pension via salary sacrifice: only at primary employer's scheme typically.

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. Compulsory SA registration: (a) Self-employment income above £1,000 (trading allowance): SA required. (b) Combined PAYE + SE above £150,000: SA required from 2025/26. (c) Untaxed savings interest above PSA: SA required. (d) Dividends above £10,000 gross outside ISA: SA required from 2024/25. (e) Capital gains above AEA £3,000: SA required. (f) Foreign income: SA required typically. (g) HICBC owing: SA required. (h) Director of close company: typically SA required. How forms interact: SA100 page 1 - employment: enter P60 figure (pay + tax). Box 1-7. SA103S / SA103F - self-employment: gross income, allowable expenses, profit. SA101 - other income: investments, foreign, etc. SA102 - employment: detailed if expense claims or benefits. Capital gains schedule: SA108. Tax computation: SA combines all into single calculation. PA applied once. Bands applied to total. Worked example - £35k PAYE + £15k self-employed profit: P60: £35k. SA103S: £15k profit. SA100 total income: £50k. PA: £12,570. Taxable income: £37,430 - all in basic band. Income tax: 20% × £37,430 = £7,486. PAYE already deducted (P60): ~£4,486. Balance due via SA: ~£3,000. PLUS Class 4 NI on SE profit: 8% × (£15,000 - threshold £12,570 covered by employed PA) = 8% × £2,430 = ~£200. PLUS Class 2 NI: voluntary or required based on profit. Total SA bill: ~£3,200. Plus Payments on Account: 50% × £3,200 = £1,600 due 31 January + 31 July. Tax code adjustments: (a) HMRC may try to collect SA debt via tax code: future year PAYE adjustment. Cap £3,000 (or up to £17,000 for high earners). (b) Avoidable: pay SA balance in cash by 31 January. (c) Useful for cash-flow-strained taxpayers: spreads cost. Class 1 employed + Class 4 self-employed NI cap: maximum combined NI capped. Reconcile via SA. Pension contributions: claim higher-rate relief via SA on personal pension contributions (if not via salary sacrifice).

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: 1 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) Annual Personal Allowance allocated proportionally: e.g., left UK month 6 of tax year, used 6/12 PA = £6,285. (2) Tax overpaid: if PAYE deductions assumed full year, you're due refund on unused PA portion. (3) Refund: cheque or bank transfer. Worked example - left UK 30 September 2026 (month 6) earning £40k pro-rata: Pro-rata pay: £20k (6 months). PAYE deducted assuming full year: ~£3,000 on £40k = £1,500 on £20k actual. Tax actually due based on £20k income (PA £12,570, basic £7,430 × 20%): £1,486. Refund: ~£14 (small in this case). Higher refund scenarios: high-rate worker leaving mid-year often saves £1,000-£5,000 refund. 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.

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.