As the current tax year comes to a close, many small businesses are turning their attention to year-end tax preparation. Planning ahead for the upcoming tax year is essential if you want to stay compliant, improve your financial strategy, and avoid penalties.
At The Numbersmith, we help business owners prepare their financial records and understand their tax position so they can face the new rules with confidence. This guide explains how to get your books ready, manage tax liabilities, and make the process easier for the year ahead.
Why Tax Year Planning Matters
Tax season can feel daunting, but early planning keeps your record-keeping clean and helps you stay compliant with HMRC requirements. Getting your books in order before the tax year-end means you can:
- Avoid costly mistakes that delay your tax return or increase your tax bill
- Prepare accurate year-end accounts and balance sheets
- Identify allowable expenses and tax reliefs to reduce tax owed
- Ensure tax compliance and avoid additional penalties
- Improve cash flow and budgeting for the following year
The tax year runs from 6 April to 5 April each year, and Self Assessment submissions for the 2024/25 year are due by 31 January 2026.
Review Your Current Financial Year
Before looking ahead, it’s vital to analyse the current financial year. Reviewing your income and expenses ensures your financial documents are accurate and complete.
Analyse key figures
Start with a review of your profit and loss report, sales invoices, and bank statements. Make sure your accounting software matches your actual bank accounts. Errors in reconciliation can distort your balance sheet and affect your tax liabilities.
Check unpaid invoices
Chase any outstanding payments before the year-end. Writing off bad debts can reduce taxable income, but it should be documented properly in your accounts.
Review business expenses
Ensure all expenses are coded correctly in your bookkeeping software. Properly classifying business expenses helps claim all available tax relief and stay compliant.
Cross-check with your accountant
Work with your tax professional or financial adviser to confirm your figures and discuss any adjustments needed for year-end tax filing.
Organise Your Financial Records
Good record keeping underpins effective tax planning. As HMRC continues to roll out Making Tax Digital (MTD), it’s essential to maintain accurate, digital financial records.
Digitalise your paperwork
Store all financial documents securely. Upload receipts and invoices into cloud-based accounting software such as Xero or QuickBooks to keep your VAT records, income and expenses, and bank statements organised.
Review your chart of accounts
Simplify your categories so your income tax and corporation tax filings are clear. Consistent categories improve accuracy in tax returns.
Back up your data
Always back up your financial records. Using cloud storage ensures that if a laptop or hard drive fails, you’ll still meet HMRC compliance requirements.
Understand Key Dates and Deadlines
Knowing your key dates prevents missed filings and penalties. Here are the critical points to remember:
- Tax year: 6 April to 5 April
- Self-assessment deadline: 31 January (online submissions)
- Corporation Tax payments: Due nine months and one day after your accounting period ends
- VAT returns: Usually quarterly, depending on registration
- PAYE submissions: Monthly, including employer National Insurance contributions (NICs)
Set calendar reminders to ensure nothing slips through the cracks.
Maximise Tax Reliefs and Allowances
Early planning helps you use every available tax relief. Below are key areas where small businesses can often reduce tax owed.
Personal allowance
Every taxpayer has a personal allowance (£12,570 in 2025/26, unless changed in the next budget). Plan director salaries and pay dividends in a tax-efficient way to make full use of this allowance.
Capital allowances
Purchasing equipment before year-end may qualify for capital allowances. The Annual Investment Allowance (AIA) provides significant tax relief of up to £1 million on qualifying assets.
Capital gains tax
If you’re selling a business asset, you may qualify for Business Asset Disposal Relief, reducing Capital Gains Tax to 10%. Timing your sale before or after the tax year-end can influence your tax position.
Pension contributions
Making pension contributions before 5 April can reduce your taxable income while boosting your retirement savings. Check with your financial adviser to ensure contributions are within limits.
Tax credits and R&D tax credits
If your company invests in innovation, you may be eligible for R&D tax credits, offering a refund or reduction in corporation tax liability. Always document project costs and seek professional advice before claiming.
Enterprise Investment Scheme (EIS)
Investing in qualifying startups through the Enterprise Investment Scheme can provide tax relief on income tax and capital gains.
Marginal relief for corporation tax
Companies with profits between £50,000 and £250,000 may qualify for marginal relief, reducing their corporation tax payments slightly below the main 25% rate.
Plan for Cash Flow and Tax Payments
Effective cash flow planning ensures you can meet your tax liabilities without stress.
Build a tax reserve
Set aside a percentage of each sale into a separate account to cover corporation tax, VAT, and income tax when they’re due.
Forecast tax payments
Use your accounting software to project your next tax payments and ensure your bank accounts have enough to cover them. This avoids last-minute borrowing and costly mistakes.
Review your payment terms
Shorten debtor days by tightening sales invoice terms, improving cash flow during the financial year.
Monitor your corporation tax liability
Your accountant can estimate your upcoming corporation tax charge well before the deadline, giving you time to plan.
Prepare for Making Tax Digital (MTD)
MTD for Income Tax will apply from 6 April 2026 for sole traders and landlords with income over £50,000, and from 6 April 2027 for those earning £30,000–£50,000. Those under £30,000 are expected to join from April 2028.
If you’re a sole trader, preparing early will ensure you stay compliant and avoid future penalties.
Steps to prepare
- Move to MTD-compatible accounting software now
- Keep quarterly digital updates ready for self-assessment.
- Review your VAT-registered status and ensure VAT returns are submitted through approved software
Work Proactively with Your Accountant
Your accountant or tax professional is more than just a number cruncher. They can help you design tax strategies that maximise tax reliefs and minimise tax liabilities.
Meet before year-end
Discuss your tax position while there’s still time to act. Adjusting pension contributions, timing purchases, or deferring income can have a big impact on your tax bill.
Plan your dividend strategy
If you’re a director, decide how much to pay in dividends before the tax year end. Consider higher tax bands to ensure your drawings remain tax efficient.
Review your financial strategy
Use your accountant’s insights to refine your financial strategy for the year ahead. They can highlight where you could improve profitability and manage tax compliance more efficiently.
Final Checklist for the Year End
Before the tax year end, run through this simple checklist:
- Reconcile bank statements and sales invoices
- Categorise all business expenses and claim allowable expenses
- Review your capital allowances and potential tax reliefs
- Prepare draft year-end accounts and review your balance sheet
- Estimate your corporation tax liability and set aside funds
- Make pension contributions before 5 April
- Review your tax return information for accuracy
- Ensure financial documents are securely stored and backed up
Completing these steps early makes year-end tax filing smoother and ensures full tax compliance.
Stay Ahead for the Following Year
Strong financial planning doesn’t stop at the year-end. To stay ahead, schedule quarterly reviews, monitor your cash flow, and keep your financial records up to date.
At The Numbersmith, we work with clients year-round to ensure their tax returns are accurate, their books are ready, and their tax planning strategies deliver real results.
By staying organised and proactive, you’ll not only meet HMRC deadlines but also position your business for growth and stability in the year ahead.
FAQ's
1. When does the UK tax year start and end?
The UK tax year runs from 6 April to 5 April the following year. For example, the 2025/26 tax year begins on 6 April 2025 and ends on 5 April 2026.
2. What should small businesses do before the tax year end?
Before the tax year end, review your financial records, reconcile bank statements, check sales invoices and expenses, and ensure your accounting software is up to date. It’s also wise to discuss tax planning opportunities with your accountant, such as capital allowances, pension contributions, and R&D tax credits.
3. How can I reduce my corporation tax liability?
You can reduce your corporation tax bill by claiming all eligible business expenses, using the Annual Investment Allowance (AIA) for equipment purchases, and reviewing capital allowances. Some companies may also qualify for marginal relief or R&D tax credits, offering significant tax relief on qualifying costs.
4. What financial records should I keep for tax compliance?
You should keep clear financial records, including bank statements, sales invoices, purchase receipts, VAT returns, payroll reports, and your balance sheet. HMRC recommends keeping these for at least six years to ensure tax compliance.
5. What is Making Tax Digital (MTD), and how does it affect me?
Making Tax Digital (MTD) is an HMRC initiative requiring businesses to keep digital financial records and submit tax returns using compatible accounting software. From April 2026, it will apply to sole traders and landlords with income over £50,000.
6. How do pension contributions help with tax planning?
Pension contributions reduce your taxable income, lowering income tax and corporation tax liabilities while helping you save for retirement. Contributions made before the tax year end can be especially tax efficient.
7. What’s the difference between the financial year and the tax year?
The tax year applies to individuals (6 April–5 April), while a financial year or accounting period usually refers to a company’s own 12-month reporting period for corporation tax. They can differ depending on your incorporation date.
8. What happens if I file my tax return late?
Missing tax return deadlines can result in penalties and interest on tax owed. To avoid additional penalties, file your Self Assessment and Corporation Tax returns early and ensure all financial documents are accurate.
9. What are the main tax reliefs available to small businesses?
Common tax reliefs include capital allowances, Business Asset Disposal Relief, R&D tax credits, the Annual Investment Allowance, and the Enterprise Investment Scheme (EIS). These can reduce your overall tax bill and encourage investment and growth.
10. How can The Numbersmith help with year-end tax preparation?
At The Numbersmith, we help small businesses with tax planning, year-end accounts, and bookkeeping to ensure complete tax compliance. We review your financial records, identify potential tax reliefs, and prepare your tax return accurately and on time.
Disclaimer
This article provides general guidance only and does not constitute financial, tax or legal advice. For personalised advice regarding your business, please consult a qualified accountant and financial adviser and stay up to date with the latest information on GOV.UK. Information is based on November 2025.