Guides
UK tax guides, in plain English
Every guide is reviewed by our ICAEW Chartered Accountant and updated for the 2026/27 tax year.
Self Assessment
Deadlines, who needs to file, penalties and how to appeal them.
Self Assessment deadline 2027: 31 January and every other date
The Self Assessment deadline for 2025/26 online returns is 31 January 2027. See every date, how payments on account work and how to get ready now.
Read the guideDo I need to do a Self Assessment tax return?
Do I need to do a Self Assessment? Find out who must file, how the £1,000 trading allowance works for side hustles, and how to register by 5 October.
Read the guideSelf Assessment late filing penalty: how much, and how to appeal
The Self Assessment late filing penalty starts at £100 and grows to £10 a day and 5% charges. See the full tables, interest and how to appeal to HMRC.
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Making Tax Digital
Who has to join MTD for Income Tax, when, and what changes.
MTD for Income Tax: who must join, when, and what you need to do
MTD for Income Tax explained: the £50,000, £30,000 and £20,000 thresholds, what counts as qualifying income, quarterly update deadlines and getting ready.
Read the guideMaking Tax Digital for landlords: what changes and how to prepare
Making Tax Digital for landlords: why gross rent sets your start date, the £50,000, £30,000 and £20,000 thresholds, quarterly deadlines and how to prepare.
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Construction Industry Scheme
Getting CIS tax back and qualifying for gross payment status.
How to claim a CIS tax refund: a step-by-step guide for subcontractors
How to claim a CIS tax refund: why 20% deductions often mean overpaid tax, a worked example, what you need, and how sole traders and companies reclaim it.
Read the guideCIS gross payment status: the tests, pros and cons, and how to apply
CIS gross payment status explained: the four HMRC tests, the £30,000 and £100,000 turnover limits, cash flow pros and cons, how to apply and keeping it.
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Landlords and property
Rental income, allowable expenses and the property allowance.
Landlord tax return guide: what to report and how rental profit is taxed
A clear landlord tax return guide for 2026/27: who must file, allowable expenses, Section 24 mortgage interest with a worked example, deadlines and CGT.
Read the guideProperty income allowance: how the £1,000 tax-free allowance works
How the £1,000 property income allowance works: full and partial relief, worked examples, when claiming expenses is better and when to tell HMRC.
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Limited companies
Whether a company makes sense and how to pay yourself.
Choosing an accountant
What it costs and what to check before you sign up.
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