Self Assessment

Self Assessment Tax Return Services

CBM Accounting takes the stress out of self assessment. Whether you’re a sole trader, freelancer, landlord, or have additional income, our team prepares and files your SA100 tax return accurately and on time — maximising your allowances and minimising your tax bill.

We handle every aspect from gathering your income and expense information to calculating your tax liability, submitting to HMRC, and advising on payment schedules. Our proactive approach means no last-minute rushes and no penalties.

Who Needs Self Assessment?

• Sole traders and self-employed individuals
• Freelancers and contractors (including IR35)
• Landlords with rental income
• Company directors and shareholders
• High earners with income over £150,000
• Individuals with capital gains from property or investments
• Those receiving foreign income or employment abroad
• Recipients of untaxed income (tips, commissions, etc.)

Our Self Assessment Services

• SA100 personal tax return preparation and filing
• Calculation of income tax, NICs, and capital gains tax
• Claiming all eligible expenses and allowances
• Payment on account calculations and scheduling
• HMRC registration for self assessment
• Tax code review and adjustment requests
• Prior year returns and voluntary amendments
• HMRC enquiry support and correspondence

Key Deadlines

Paper returns must be filed by 31 October, online returns by 31 January following the end of the tax year. Payment of any tax owed is also due by 31 January. Miss these deadlines and you face automatic penalties starting at £100. We track all deadlines for you and file well in advance.