Tax Returns Checklist

Filing your self-assessment tax return accurately and on time is essential. Missing the deadline triggers automatic penalties. Missing deductions costs you money. Providing incorrect information invites HMRC investigation. This comprehensive checklist ensures you have everything you need before filing.

Before You Start

Essential Documents

• Your Unique Taxpayer Reference (UTR) — HMRC will have sent this
• Your National Insurance number
• Any letters or notices from HMRC for this tax year
• Last year's tax return (for reference)

Employment Income

If you receive employment income (salary, wages, bonuses):

• P60 forms from all employers (issued by January 31st following the tax year)
• P11D forms if you receive benefits-in-kind (car, medical insurance, etc.)
• Details of any payments made for pension contributions (these can reduce taxable income)
• Details of any professional fees or subscriptions (if your employer didn't reimburse these, you can claim them)
• Records of work-from-home costs if claiming the home office deduction

Self-Employment Income

If you're self-employed or run a business:

• Complete records of all income (invoices, bank statements showing payments received)
• Details of any income sources outside your main business
• Documentation of business expense (see section below)
• Opening and closing inventory values (if you hold stock)
• Details of any capital assets purchased during the year
• Records of estimated tax payments already made
• Accounts prepared on a consistent basis (preferably professionally prepared)

Business Expenses

Gather receipts and documentation for all business expenses:

Direct Costs

• Materials and supplies for producing goods/services
• Stock purchased for resale
• Direct labor costs (excluding your own salary)
• Subcontractor payments

Operating Costs

• Rent or mortgage interest (not capital repayment) on business premises
• Utilities (electricity, gas, water, internet) — business proportion if from home
• Insurance (business, professional liability, employer's liability)
• Repairs and maintenance (not capital improvements)
• Cleaning and waste disposal

Staff Costs

• Wages and salaries paid
• Employer's National Insurance contributions
• Pension contributions for employees
• Training and professional development

Professional Fees

• Accountant and bookkeeper fees
• Solicitor and legal fees (for business matters)
• Consultants or contractors

Administration Costs

• Stationery and office supplies
• Postage and courier services
• Telephone and internet (business proportion)
• Subscriptions and memberships (professional or business-related)
• Books and publications (professional or technical)

Marketing and Travel

• Advertising and marketing costs
• Website costs and IT expenses
• Business travel (train, car mileage, flights, hotels)
• Client entertainment (limited deductibility)

Vehicle Expenses (if claiming mileage)

• Business mileage records (date, purpose, distance)
• Alternatively: fuel, maintenance, and repairs on the percentage attributable to business use

Home Office Expenses

• Rent (business proportion)
• Council tax (business proportion)
• Utilities (business proportion)
• Insurance (business proportion)
• Repairs and maintenance (business proportion)

Use a consistent method to calculate the business proportion (e.g., percentage of home used for business, or number of rooms dedicated to business).

Investment Income

If you receive investment income:

• Interest received statements from savings accounts, bonds, or other interest-bearing investments
• Dividend statements from shares, unit trusts, or investment funds
• Rental income from property (if not run as a business) — see property section below
• Details of any tax paid at source on investment income (this reduces your tax liability)

Property Income

If you have rental or other property income:

• Rent received during the year (from all properties)
• Council tax paid on rental properties
• Mortgage interest paid (mortgage capital repayment doesn't count) — the amount is often shown on your mortgage statement
• Insurance for rental properties
• Repairs and maintenance costs (not capital improvements)
• Letting agent fees (if you use an agent)
• Utilities and services provided to tenants
• Professional fees (surveyor, solicitor) related to the property
• Advertising and letting costs

Note: Mortgage capital repayment is not an allowable expense, only the interest.

Capital Gains

If you've sold investments or assets:

• Date purchased and original cost of assets sold
• Date sold and sale price
• Details of any enhancement costs (improvements made to increase value)
• Amount of any capital gains tax paid already

Keep records of significant capital gains even if below the exemption threshold — HMRC requires reporting.

Pension Contributions

If you've made pension contributions:

• Statements from your pension provider showing contributions made
• Details of personal pension contributions (these reduce taxable income)
• Details of any contributions by your employer (if self-employed, you can claim these)

Gift Aid and Charitable Donations

• Records of donations to registered charities
• Charity Gift Aid certificates (if available)
• Details of donations made through payroll giving schemes

Charitable donations can be claimed as a higher-rate tax relief in some circumstances.

Marriage Allowance and Other Personal Allowances

• Your personal allowance used (£12,570 in 2024/25)
• If married or in a civil partnership, information about your spouse's income (for marriage allowance claims)
• Any other personal allowances you're entitled to

Losses and Deductions

• Details of any losses from self-employment (these can offset other income)
• Details of any trading losses (these can be carried forward)
• Details of any capital losses (these offset capital gains)

Tax Paid and Payments on Account

• Records of any tax payments already made (payments on account, tax paid at source)
• Self-assessment payment receipts from previous years
• Tax deducted from employment income (shown on P60)
• Tax deducted from savings interest or dividends

Key Dates to Remember

• 31 January: Tax return deadline and final payment of tax due
• December 31st: Deadline to notify HMRC if you need to complete a tax return for the first time
• Throughout the year: Keep all receipts, invoices, and records

Common Mistakes to Avoid

• Missing the deadline: File early — don't wait until January 31st
• Wrong amounts: Double-check figures from statements and documents
• Claiming disallowed expenses: Personal expenses, fines, and certain other costs aren't deductible
• Missing capital allowances: Equipment and vehicles can qualify for capital allowances — don't miss these
• Not reporting all income: Any income source must be declared, even small amounts
• Poor record keeping: HMRC may challenge claims without supporting documents

Getting Help with Your Tax Return

If you find this overwhelming, or if your tax situation is complex, professional help is available.

A qualified accountant can:

• Help you organize your documents
• Identify expenses you might miss
• Prepare and file your return accurately
• Ensure you claim all allowances and reliefs you're entitled to
• Answer HMRC inquiries if they arise

Your tax return is a critical document. Filing it accurately and on time avoids penalties and ensures you're not overpaying tax. Use this checklist to gather your information systematically, and consider professional support if your situation is complex. If you need help preparing or reviewing your tax return, contact Figures UK to ensure everything is correct before submission.