Year-End Tax Planning for Limited Companies: 15 Ways to Reduce Your Tax Bill

The weeks before your company year-end represent the biggest tax planning opportunity of your financial year. Actions taken now can legitimately reduce your Corporation Tax bill by thousands, but once your accounting period closes, most opportunities disappear entirely.

This guide covers 15 proven strategies that UK limited company directors can implement before year-end to minimise their tax liability legally and effectively.

Why Year-End Tax Planning Matters

Your Corporation Tax liability crystallises at the end of your accounting period. Expenses, allowances, and reliefs must generally be incurred or claimed within that period to count against that year's profits.

The maths is simple: Every £1,000 you can legitimately move from profit to expense saves you £190-£250 in Corporation Tax (depending on whether you're in the small profits rate at 19% or the main rate at 25%). Use our corporation tax calculator to see your exact liability.

For a company with £100,000 profit, finding just £10,000 in legitimate year-end planning opportunities saves approximately £2,260 in tax.

Quick Wins: Year-End Tax Planning Summary

1. Pension Contributions: The Most Powerful Tool

Annual Allowance: £60,000 (or 100% of earnings if lower)

Employer pension contributions are one of the most tax-efficient ways to extract value from your company.

Why It Works

When your company pays directly into your pension:

• Corporation Tax relief - The contribution is a deductible expense (saves 19-25%)
• No Income Tax - Unlike salary, no personal tax on the contribution
• No National Insurance - Saves 15% Employer's NI vs equivalent salary
• No Dividend Tax - Bypasses the dividend tax rates entirely

Year-End Strategy

If you have unused pension annual allowance, make a contribution before your year-end. You can also use carry forward to utilise unused allowance from the previous three years.

Example: A director with £80,000 company profit could contribute £30,000 to their pension, reducing Corporation Tax by £6,900 (at 23% marginal rate) whilst building tax-free retirement savings.

Watch out for: The Annual Allowance tapers for income over £260,000 (Threshold Income) combined with £200,000 (Adjusted Income).

2. Capital Allowances: Annual Investment Allowance

Current AIA Limit: £1,000,000

The Annual Investment Allowance lets you deduct 100% of qualifying plant and machinery costs in the year of purchase.

What Qualifies

• Computer equipment and servers
• Office furniture and fixtures
• Vehicles (except cars - different rules)
• Manufacturing equipment
• Tools and machinery
• Solar panels and energy-efficient equipment

Year-End Strategy

If you've been delaying equipment purchases, buying before your year-end accelerates the tax relief by 12 months. Equipment costing £10,000 saves £2,500 in Corporation Tax immediately rather than next year.

Important: The asset must be purchased AND available for use before your year-end. Ordering equipment that arrives after year-end doesn't count.

Pro tip: Consider the 130% super-deduction replacement - whilst this ended April 2023, the standard AIA remains extremely generous at £1 million.

3. R&D Tax Credits

Enhanced Deduction: 86% of qualifying expenditure (merged scheme from April 2024) Payable Credit: Available for loss-making companies

R&D tax relief is consistently under-claimed by small companies who don't realise their work qualifies.

What Qualifies as R&D

You're advancing science or technology if you're:

• Developing new products, processes, or services
• Improving existing products beyond normal incremental updates
• Overcoming technical uncertainty
• Building bespoke software solutions

Year-End Strategy

Review the past 12 months of development work. Many activities qualify that companies don't claim:

• Failed projects (yes, really - failure is inherent in R&D)
• Internal tools development
• Process improvements requiring technical solutions
• Integration of new technologies

Example: A software company spending £50,000 on developing a new feature could claim an additional £43,000 deduction (86% enhanced deduction), saving approximately £10,000 in Corporation Tax.

Warning: HMRC is scrutinising R&D claims more carefully. Ensure your claim is robust and well-documented.

4. Salary and Bonus Timing

Optimal Director Salary: £12,570 (Personal Allowance threshold)

How you time salary and bonus payments affects which tax year they fall into.

Year-End Strategy

If you plan to pay a director's bonus, declare it before year-end to get Corporation Tax relief this year. The bonus must be:

• Voted/approved before year-end
• Actually paid within 9 months of year-end

A £20,000 bonus declared before year-end saves £4,600 in Corporation Tax (at 23% marginal rate). The director pays Income Tax and NI on receipt, but at lower rates than leaving profits in the company. Use our salary calculator and see our director's salary guide for optimal amounts.

Tactical consideration: If next year's profits will be lower (pushing you into the 19% small profits rate), you might defer the bonus to save at the higher rate this year.

5. Bad Debt Write-Offs

Relief: 100% deduction against profits

If customers owe you money they're unlikely to pay, write it off before year-end.

Requirements for Write-Off

• The debt must have been included in your sales (i.e., you've already paid tax on it)
• You've made reasonable efforts to collect
• There's genuine reason to believe it's uncollectable

Year-End Strategy

Review your aged debtors list. Any invoice over 6 months old with no payment activity is a candidate. Write off these debts formally with a board minute.

Example: Writing off £8,000 of uncollectable invoices reduces your Corporation Tax by £2,000.

Don't forget: If you later collect a debt you've written off, you'll need to include it as income in that future year.

6. Stock Valuation Review

Valuation Rule: Lower of cost or net realisable value (NRV)

Overstated stock inflates your profits. A year-end stock review can identify write-downs.

Year-End Strategy

Physically review your stock before year-end. Identify:

• Damaged or obsolete items
• Slow-moving stock unlikely to sell at full price
• Items where market prices have fallen below your cost

Write down stock to its realistic selling price less costs of sale.

Example: Stock costing £15,000 that can only be sold for £8,000 should be valued at £8,000. This £7,000 reduction saves £1,750 in Corporation Tax.

Document thoroughly: Take photos and keep records of why stock was written down.

7. Prepay Expenses

Rule: Prepayments up to 12 months can be deducted in full

Prepaying regular expenses before year-end accelerates your tax relief.

What You Can Prepay

• Insurance premiums (professional indemnity, public liability)
• Software subscriptions (annual plans)
• Rent (if allowed by lease)
• Service contracts
• Marketing and advertising campaigns
• Training courses scheduled for next year

Year-End Strategy

If you have surplus cash and know you'll incur these expenses anyway, prepay before year-end. This is particularly effective if you're expecting lower profits next year.

Example: Prepaying £6,000 of annual software subscriptions saves £1,380 in Corporation Tax this year rather than next.

Limit: HMRC accepts prepayments up to 12 months ahead. Beyond that, you may need to spread the deduction.

8. Defer Income (Carefully)

Principle: Income is taxed when earned/invoiced, not when paid

If you're approaching year-end with higher-than-expected profits, deferring income can be strategic.

Year-End Strategy

• Delay sending invoices until after year-end (where contractually acceptable)
• Don't chase deposits on new projects until after year-end
• Time project completions to fall into the next accounting period

Example: A £25,000 project invoice sent on Day 1 of your new accounting period instead of the last day of this year defers £5,750 of Corporation Tax by 12 months.

Critical warning: This is about legitimate timing. Don't backdate invoices or fail to invoice work already completed - that's tax evasion, not planning.

9. Director's Loan Account Cleanup

Section 455 Tax: 33.75% on overdrawn director's loans

If your director's loan account is overdrawn (you owe the company money), this triggers Section 455 tax.

Year-End Strategy

Review your DLA before year-end:

• Repay the loan (even temporarily)
• Declare dividends to offset the loan (if profits permit)
• Ensure expenses are properly processed against the loan

The maths: A £10,000 overdrawn DLA costs £3,375 in Section 455 tax (though this is refundable when you repay). Clearing it before year-end avoids this cash flow hit entirely.

Common trap: Directors who borrow from the company, repay before year-end, then borrow again shortly after. HMRC's "bed and breakfasting" rules catch this - you must stay out of debt for 30+ days.

10. Charitable Donations (Gift Aid)

Relief: 100% deduction from profits

Corporate charitable donations reduce your taxable profits pound for pound.

Year-End Strategy

If you plan to make charitable donations anyway, make them through your company before year-end rather than personally.

Example: A £5,000 donation to charity reduces Corporation Tax by £1,250. If you made the same donation personally, you'd get higher-rate relief of £1,250 as well - but only if you're a 40% taxpayer. Company donation is often more efficient.

Qualifying charities: Must be registered with HMRC for Gift Aid. Check the charity register.

11. EIS and SEIS Investment Deferral

CGT Deferral: Unlimited for EIS, £200,000 for SEIS

If you have capital gains, investing in EIS/SEIS qualifying companies defers the CGT.

Year-End Strategy

If you've realised capital gains and want to defer the tax, EIS/SEIS investments made in the same tax year (or carried back one year) can defer the gain indefinitely.

EIS Benefits:

• Defer CGT on any gain reinvested
• 30% Income Tax relief on the investment
• CGT-free growth if held 3+ years

SEIS Benefits:

• 50% Income Tax relief
• CGT reinvestment relief of 50%
• CGT-free growth if held 3+ years

Warning: These are high-risk investments. Never invest purely for tax relief - you could lose your entire investment.

12. Spouse/Partner Salary

Opportunity: Utilise their Personal Allowance and lower tax bands

If your spouse helps with the business, paying them a salary is tax-efficient.

Year-End Strategy

Ensure your spouse has been paid appropriately for any work done during the year. Common roles include:

• Bookkeeping and administration
• Social media management
• Customer service
• Cleaning business premises

Requirements:

• Work must be genuine and documented
• Salary must be reasonable for the work done (market rate)
• Payroll must be operated properly (RTI submissions)

Example: Paying your spouse £12,570 (their Personal Allowance) for genuine work saves approximately £2,885 in Corporation Tax whilst they pay zero Income Tax.

HMRC scrutiny: This is a common area of HMRC challenge. Keep timesheets and evidence of work done.

13. Training and Development Costs

Relief: 100% deductible

Training that improves your skills in your current role is fully deductible.

Year-End Strategy

Book training courses, conferences, or development programmes before year-end, even if they occur next year. The expense counts when you commit to the spend.

What qualifies:

• Industry conferences and seminars
• Professional qualification courses
• Online learning (Udemy, Coursera, LinkedIn Learning)
• Coaching and mentoring
• Books and educational materials

Example: A £3,000 leadership development course saves £750 in Corporation Tax.

What doesn't qualify: Training for an entirely new career unrelated to your current business.

14. Equipment Purchases and Technology

AIA Relief: 100% in year of purchase

Beyond the AIA mentioned earlier, consider specific equipment timing.

Year-End Strategy

Review planned purchases for the next 6 months. If they can be accelerated to before year-end without operational issues, you gain 12 months earlier tax relief.

Consider:

• Computer hardware replacements
• Office furniture upgrades
• Vehicle purchases (vans - not cars)
• Energy-efficient equipment (additional reliefs available)
• Security equipment

Pro tip for cars: Cars don't qualify for AIA. Instead, claim:

• 100% First Year Allowance for zero-emission vehicles
• 18% Writing Down Allowance for CO2 up to 50g/km
• 6% for higher emission vehicles

15. Loss Utilisation

Carry-Back: Losses can be carried back 1 year (12 months from April 2022)

If your company makes a loss, you have options for relief.

Year-End Strategy

If you're heading for a loss this year but were profitable last year:

• Carry back the loss to reclaim Corporation Tax paid last year
• This generates a cash refund rather than just future relief

If profitable this year but loss-making last year:

• Ensure last year's losses have been offset against this year's profits
• Check no losses are about to expire unused

Extended loss carry-back: During COVID, companies could carry back losses 3 years. This has now returned to 1 year for most companies.

Year-End Tax Planning Checklist

Use this checklist 4-6 weeks before your year-end:

Financial Review

• Calculate projected profit for the year
• Review outstanding debtors for bad debt write-off
• Conduct physical stock count and valuation review
• Check director's loan account position

Expenditure Planning

• Identify equipment purchases to accelerate
• Review training needs and book courses
• Consider prepaying 12 months of regular expenses
• Evaluate pension contribution headroom

Documentation

• Minute any bonus declarations before year-end
• Document bad debt write-offs with evidence
• Photograph written-down stock with explanations
• Ensure spouse salary is supported by timesheets

Specialist Areas

• Review R&D activities for potential claim
• Consider EIS/SEIS investments if holding gains
• Check charitable donation timing
• Assess whether income deferral is appropriate

How AccountsOS Helps with Year-End Tax Planning

Year-end tax planning requires visibility into your numbers well before the deadline. AccountsOS gives you the real-time data you need:

Live Profit Tracking

See your estimated Corporation Tax liability update daily as transactions flow in. No waiting until year-end to discover you're in a higher tax band.

Intelligent Alerts

AccountsOS notifies you 8 weeks before year-end with personalised suggestions:

• "You have £23,000 unused pension annual allowance"
• "Consider accelerating £8,500 equipment purchase before year-end"
• "3 invoices over 180 days old may qualify for bad debt relief"

Ask in Plain English

Simply ask: "What tax planning options do I have before year-end?" and get analysis based on your actual company data, not generic advice.

Scenario Modelling

Test different strategies before committing: "What's my tax if I contribute £40,000 to my pension vs taking a £40,000 dividend?"

Frequently Asked Questions

When should I start year-end tax planning?

Start at least 8 weeks before your accounting period ends. Some strategies (like pension contributions and equipment purchases) need time to arrange. Leaving it to the final week limits your options significantly.

Can I still claim expenses after my year-end?

No - expenses must be incurred within the accounting period to count against that year's profits. Once your year-end passes, those opportunities are gone until next year.

How do I know if I'm in the 19% or 25% Corporation Tax bracket?

For 2025/26:

• 19% applies if profits are £50,000 or less
• 25% applies if profits exceed £250,000
• Marginal relief applies between £50,000-£250,000 (effective rate 19-25%)

These thresholds are divided by the number of associated companies.

Is it worth prepaying expenses just for tax relief?

Only if you have the cash and would incur the expense anyway. Spending £1,000 to save £250 in tax still costs you £750. Prepayment accelerates relief but doesn't create savings on spend you wouldn't otherwise make.

What's the deadline for pension contributions to count?

Pension contributions must hit your pension fund before your accounting period end date to count as that year's expense. Allow 5-10 working days for processing.

Can I change my year-end date for tax planning?

Yes, you can change your accounting reference date with Companies House. This can be strategic (aligning with tax year changes or spreading profits). However, you can only extend to a maximum of 18 months once every 5 years.

How much can I contribute to my pension if I have carry forward?

You can carry forward unused Annual Allowance from the previous 3 tax years. If you contributed nothing for 3 years, you could potentially contribute up to £180,000 (£60,000 x 3 years) plus this year's £60,000 allowance - subject to having sufficient earnings.

Do these strategies work for small profits under £50,000?

Absolutely. Even at the 19% rate, every £1,000 of legitimate deductions saves £190 in Corporation Tax. The strategies are the same; only the savings percentage differs.

Take Action Before Your Year-End

The strategies in this guide are all legitimate, HMRC-approved ways to reduce your Corporation Tax liability. The key is acting before your year-end closes.

Your next steps:

1. Check how many weeks until your year-end
2. Review the checklist above for quick wins
3. Prioritise the highest-impact strategies for your situation
4. Implement before your accounting period closes

Need help identifying your best opportunities? AccountsOS analyses your company data and highlights year-end planning opportunities specific to your situation. See how it works and our pricing, then start your free trial and get personalised tax planning recommendations today.

Tax rules change frequently. This article reflects UK tax law as of January 2026. Always verify current rates with HMRC or consult a qualified accountant for advice specific to your situation.