Self Assessment
Tax Returns
Personal tax returns prepared thoroughly and filed on time, with every allowance and relief checked so you never pay more tax than you legally owe.
What's included
Self assessment affects millions of people in the UK, from limited company directors and the self-employed to landlords, higher-rate taxpayers and those with investment income. Getting your return right means paying the correct amount of tax, and not a penny more.
We prepare your return carefully, reviewing all sources of income and every allowable expense and relief before filing with HMRC on your behalf.
- Full self assessment tax return (SA100) preparation and filing
- Employment income, benefits and expenses (SA102)
- Self-employment income and expenses (SA103)
- UK property income (SA105), furnished and unfurnished lettings
- Capital gains tax calculations and reporting (SA108)
- Dividend and investment income
- Foreign income where applicable
- Pension contributions and higher-rate tax relief claims
- Marriage allowance and blind person's allowance
- Gift Aid declarations
- Payment on account calculations and management
- Tax calculation and HMRC submission confirmation
Who needs to file a self assessment return?
You must file a self assessment return if, in the last tax year, you were:
- Self-employed as a sole trader with income over £1,000
- A partner in a business partnership
- A company director (unless your company is non-profit)
- Earning over £100,000 in any income
- Receiving rental income
- A higher or additional rate taxpayer with untaxed income
- Receiving income from savings, investments or dividends above allowances
- In receipt of Child Benefit where income exceeds £60,000
Allowances and reliefs we check
Many people overpay tax simply because they don't know what they can claim. We make sure every valid expense and relief is included in your return:
- Working from home allowance
- Business mileage and travel expenses
- Professional subscriptions and memberships
- Business equipment and technology
- Pension contributions (higher-rate tax relief)
- Charitable donations under Gift Aid
- Wear and tear / replacement of domestic items (landlords)
- Capital allowances on business assets
Key deadlines
- 31 October, paper return deadline (if filing by post)
- 31 January, online return filing deadline and tax payment due
- 31 July, second payment on account due
We start working on your return well in advance of the deadline and will notify you of your tax liability as early as possible so you can plan your cash flow accordingly.
Late filing penalties
Missing the 31 January deadline results in an automatic £100 penalty, even if you have no tax to pay, see our late filing penalty calculator for the full schedule. Further penalties apply for continued delays. We keep you on track so this never happens. Book a free call to get started.
Related services
Frequently asked questions
Do I need to file a self assessment return?
You generally must file if you are self-employed earning over £1,000, a partner in a business, a company director, earn over £100,000, receive rental income, have untaxed income such as dividends or savings above your allowances, or receive Child Benefit while you or your partner earn over £60,000.
What happens if I miss the 31 January deadline?
You get an automatic £100 penalty even if you owe no tax, followed by £10 a day after 3 months up to a 90-day cap, then further penalties at 6 and 12 months. See our late filing penalty calculator for the exact figures.
What are payments on account?
If your tax bill exceeds £1,000, HMRC requires advance payments towards next year's tax, split between 31 January and 31 July, each 50% of your previous year's liability. This can catch first-time filers off guard, we help you plan for it.
How far in advance should I get my self assessment done?
We recommend starting as soon as the tax year ends in April, well ahead of the 31 January deadline. This gives you time to plan for the tax bill and avoids the January rush, when accountants and HMRC's phone lines are busiest.
Can you help if I've never filed a return before?
Yes, this is one of the most common situations we handle. We'll register you with HMRC if needed, explain what applies to your circumstances, and walk you through the whole process. See our first self assessment guide for more detail.
Never miss a tax deadline again
Let Claritax handle your self assessment return. We'll make sure it's complete, accurate, and filed well ahead of the deadline.