Guides › HMRC and Tax
HMRC and Tax
Plain-English help with HMRC: Self Assessment deadlines and penalties, tax codes and refunds, tax reliefs you can claim yourself for free, and how to challenge a decision or complain. Every fact is checked against GOV.UK.
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Each guide has your rights, step-by-step actions and time limits.
Income Tax Rates 2026 to 2027The bands, the Personal Allowance and the £100,000 taper.Open Guide →How to Contact HMRCWebchat, phone, extra support and tips to get through.Open Guide →Find Your NI NumberWhere to look, free.Open Guide →Registering as Self-EmployedThe £1,000 rule and 5 October deadline.Open Guide →P45, P60 and P11DWhat each form is for.Open Guide →Simple Assessment LettersPA302 bills and the 60-day window.Open Guide →Tax on Your State PensionHow it is collected.Open Guide →Child Benefit at 16 to 19Extend it or it stops after 31 August.Open Guide →Tax Credits OverpaymentsAfter tax credits ended.Open Guide →Rent a Room Scheme£7,500 tax-free from a lodger.Open Guide →Capital Gains TaxThe £3,000 allowance and the rates.Open Guide →Self Assessment DeadlinesRegister by 5 October, file online and pay by 31 January.Open Guide →Late Tax Return PenaltiesThe £100 penalty, daily charges and late payment penalties.Open Guide →Appeal a PenaltyThe 30-day deadline and what counts as a reasonable excuse.Open Guide →Cannot Pay Your Tax BillSet up a payment plan and avoid enforcement.Open Guide →P800 Letters and RefundsWhat your tax calculation means and how to claim.Open Guide →Emergency Tax CodeW1, M1 and X codes and how to fix them.Open Guide →Wrong Tax CodeCheck and correct your tax code.Open Guide →Uniform and Tools Tax ReliefClaim back up to 4 years, free.Open Guide →Working From Home ReliefThe 2026 change and claiming earlier years.Open Guide →Marriage AllowanceSave up to £252 a year and backdate 4 years.Open Guide →Child Benefit Tax ChargeThe £60,000 to £80,000 rules.Open Guide →Selling Online and TaxVinted, eBay and Etsy: when you need to tell HMRC.Open Guide →Making Tax DigitalWho must join and when.Open Guide →Tax on SavingsPersonal Savings Allowance and HMRC letters.Open Guide →Pension Withdrawal Tax RefundsReclaim overpaid tax with P53Z or P53.Open Guide →State Pension ForecastCheck your forecast and National Insurance gaps.Open Guide →Tax Refund CompaniesClaim yourself for free and keep 100%.Open Guide →Tax Refund ScamsSpot fake HMRC texts and emails.Open Guide →Disagree With a DecisionAppeal, review and the tax tribunal.Open Guide →Complain to HMRCHow the complaints process works.Open Guide →The Adjudicator's OfficeIndependent complaints after HMRC's reviews.Open Guide →
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