Tax Planning for New Limited Companies: First Year Essentials

Starting a UK limited company gives you significant control over how and when you pay tax. The decisions you make in your first year can save or cost you thousands over the lifetime of your business. Get the fundamentals right now, and you'll build tax efficiency into your company from day one.

The key first-year tax decisions: Choose an optimal accounting year-end, set up tax-efficient salary and dividend extraction immediately, claim all available startup expenses (including costs from before you incorporated), and decide whether to register for VAT. Each of these choices affects your tax position for years to come.

First Year Timeline: Key Tax Milestones

Your first year as a limited company director involves several critical tax deadlines and decisions. Here's what to expect:

See our complete first year limited company guide for the full checklist.

Choosing Your Accounting Year-End

Your accounting year-end (officially the Accounting Reference Date or ARD) determines when your tax year ends, when you pay Corporation Tax, and your planning opportunities. This is one of the most important early decisions.

Why Your Year-End Matters

Tax payment timing: Corporation Tax is due 9 months and 1 day after your year-end. A 31 March year-end means paying by 1 January. A 31 December year-end means paying by 1 October.

Planning opportunities: Your year-end creates a natural review point. Aligning it with when you typically have the best visibility on annual profits helps with planning.

Cash flow management: Some year-ends create easier cash flow timing than others, depending on your business seasonality.

Popular Year-End Choices

Our Recommendation

For most new UK limited companies, 31 March is the optimal choice. It nearly aligns with the personal tax year (ending 5 April), making salary and dividend planning straightforward. It also means your CT600 is due by 31 March the following year, and payment by 1 January.

First Accounting Period Rules

Your first accounting period can be up to 18 months from incorporation. Companies House automatically sets your ARD to the last day of the month containing your incorporation anniversary.

Example: Incorporate on 15 June 2025. Your default ARD is 30 June. Your first accounts cover 15 June 2025 to 30 June 2026 (12.5 months).

To change your ARD:

• File form AA01 with Companies House (free)
• You can shorten your period at any time
• You can extend once every 5 years (maximum 18 months total)

Strategic tip: If you incorporate late in the tax year, consider extending your first accounting period. This gives you more time to accumulate profits and plan your first year-end tax position.

Setting Up Tax-Efficient Extraction from Day One

How you pay yourself from your company has a bigger impact on your tax bill than almost any other decision. Set this up correctly from the start.

Optimal Salary from Day One

For most directors in 2025/26, the optimal salary is £12,570 - exactly the Personal Allowance.

Why this works:

• Zero Income Tax (within Personal Allowance)
• Zero Employee's National Insurance (below £12,570 threshold)
• Corporation Tax relief for your company (salary is deductible)
• State Pension qualifying year (requires minimum £6,725 earnings)

What your company pays:

• Salary: £12,570
• Employer's NI: £1,135.50 (15% on earnings above £5,000)
• Less CT relief: -£3,142.50 (at 25% rate)
• Net cost: £10,563

You receive £12,570 in your pocket with no personal deductions. See our director's salary 2025/26 guide for detailed calculations.

First year tip: Set up payroll immediately, even if you only pay yourself once a year. Register as an employer with HMRC before your first payment.

Pension Contributions

Employer pension contributions are one of the most tax-efficient extraction methods:

• Corporation Tax relief: The contribution is a deductible expense
• No Income Tax: Unlike salary, no personal tax on contributions
• No National Insurance: Saves 15% Employer's NI vs salary
• Tax-free growth: Pension investments grow without CGT

First year strategy: Even small contributions build good habits. Set up a workplace pension and contribute what you can afford. The Annual Allowance is £60,000 per year, but you can only contribute up to 100% of your earnings.

Dividend Planning

After salary and pension, dividends are your next extraction method. They're taxed at lower rates than salary:

First year dividend tip: You can only pay dividends from accumulated profits. If your company isn't yet profitable, you cannot pay dividends. Build profits first, then extract via dividends quarterly or annually.

Documentation matters: Every dividend needs:

• Board minutes approving the dividend
• Dividend voucher for each shareholder
• Entry in company accounts

First Year Expenses to Claim

New companies often miss legitimate expenses. Everything you spend that's "wholly and exclusively" for business purposes is deductible.

Pre-Trading Expenses (Up to 7 Years Before)

You can claim expenses incurred up to 7 years before you started trading. These are treated as if incurred on day one of trading.

What qualifies:

• Market research costs
• Business planning and feasibility studies
• Training related to your new business
• Travel for business setup
• Professional advice (legal, accounting)
• Website development before launch

How to claim: Include these expenses in your first year accounts. Keep receipts and records showing the date incurred and business purpose.

Equipment and Setup Costs

Common first-year capital purchases (qualifying for 100% AIA relief):

• Computer equipment (laptops, monitors, peripherals)
• Office furniture (desk, chair, storage)
• Software and hardware
• Tools and equipment specific to your trade
• Mobile phones and accessories

First year tip: Buy equipment before your first year-end to get tax relief immediately. A £2,000 laptop saves £500 in Corporation Tax in year one rather than year two.

Professional Fees

Fully deductible professional costs:

• Company formation fees: £12-100 depending on service
• Accountant fees: Year-end accounts, tax returns, advice
• Legal fees: Contracts, terms and conditions, employment documents
• Insurance: Professional indemnity, public liability
• Regulatory registrations: ICO fee (£40-60), industry registrations

Working from Home

If you work from home, your company can pay you for the business use of your home. Two methods:

Simplified method: £6 per week (£312 per year) with no receipts needed.

Actual cost method: Calculate the proportion of home costs attributable to business use. This includes:

• Mortgage interest or rent (proportional to office space)
• Utilities (electricity, gas, water)
• Council tax
• Home insurance
• Broadband (business proportion)

Example: Your home office is 1 room of 5 (20% of space). Annual home costs: £15,000. Claim: £3,000 (20%). You'll need to prove the calculation with utility bills.

See our full working from home tax relief guide for detailed calculations.

Capital Allowances in Year One

Capital allowances let you deduct the cost of business assets from your profits, potentially saving 25% of every pound spent.

Annual Investment Allowance (AIA)

The AIA gives you 100% first-year relief on qualifying plant and machinery up to £1 million per year.

What qualifies:

• Computer equipment
• Office furniture
• Vehicles (vans, trucks - not cars)
• Tools and machinery
• Fixtures and fittings

Full Expensing

Since April 2023, full expensing provides 100% relief on new plant and machinery with no cap. This supplements the AIA for purchases over £1 million.

For most new companies: The £1 million AIA limit means you'll never need full expensing. Use AIA for its flexibility (covers new and second-hand assets).

Why Timing Matters

Assets must be purchased AND available for use before your year-end to claim that year.

First year strategy:

• List planned equipment purchases for the next 12 months
• Buy before your first year-end where practical
• Every £1,000 accelerated saves you 9 months of waiting for tax relief

Example: Your year-end is 31 March. You plan to buy £8,000 of equipment in May. Bringing that forward to March saves you £2,000 in Corporation Tax 12 months earlier.

See our complete capital allowances guide for detailed rules.

VAT Considerations

VAT registration is one of the biggest first-year decisions. Get it wrong and you'll either pay penalties for late registration or voluntarily add complexity you don't need.

When Registration Is Mandatory

You must register for VAT when:

• Your taxable turnover exceeds £90,000 in any 12-month rolling period
• You expect to exceed £90,000 in the next 30 days alone

Once registered, you charge VAT on sales (output tax) and reclaim VAT on purchases (input tax). You pay the difference to HMRC quarterly.

Voluntary Registration: Pros and Cons

You can voluntarily register even if turnover is below the threshold.

Register voluntarily if:

• Your customers are VAT-registered businesses (they reclaim what you charge)
• You have significant startup costs with VAT to reclaim
• It makes your business appear more established to clients

Don't register if:

• Your customers are mainly consumers (they can't reclaim, so you're 20% more expensive)
• Your margins are thin and adding 20% would price you out
• Admin burden outweighs benefits

Flat Rate Scheme in First Year (1% Discount)

The Flat Rate Scheme (FRS) simplifies VAT by letting you pay a fixed percentage of gross turnover rather than tracking every input and output.

First year bonus: New VAT-registered businesses get a 1% discount on their flat rate percentage for the first year.

How it works:

• You charge customers standard 20% VAT
• You pay HMRC a lower flat rate (varies by industry: 10-14.5% typically)
• You keep the difference as profit
• You don't reclaim VAT on purchases (with some exceptions)

Example: Consultant with 14.5% flat rate (13.5% in year one). Turnover £60,000. VAT collected: £12,000 (20%). VAT paid to HMRC: £8,100 (13.5%). Profit from FRS: £3,900.

When FRS works: Low expenses, high margins, service businesses. When it doesn't work: Significant equipment purchases (you can't reclaim the VAT).

Corporation Tax Planning

Understanding the Corporation Tax rates and how to manage them is essential from day one.

19% vs 25% Rates

Marginal relief: Between £50,000 and £250,000, the effective rate increases gradually. At £100,000 profit, the marginal rate is approximately 26.5% on the next pound earned (higher than the main rate due to the marginal relief formula).

Use our corporation tax calculator to see your exact liability.

Associated Company Rules

If you have other companies, the thresholds are divided by the number of associated companies.

Example: You control two companies. The £50,000 small profits threshold becomes £25,000 each. The £250,000 main rate threshold becomes £125,000 each.

First year consideration: If you're thinking of running multiple businesses, consider whether a single company with trading divisions is more tax-efficient than multiple associated companies.

Marginal Relief Calculations

If your profits fall between £50,000 and £250,000, marginal relief reduces your CT bill below the 25% main rate. The effective rate ranges from 19% to 25%, with the marginal rate on each additional pound being 26.5%. This creates a planning opportunity: if you're just above £50,000, reducing profits to £50,000 saves more than you might expect.

Building Good Habits from Day One

The habits you establish in year one determine whether accounting feels manageable or overwhelming.

Separate Business Bank Account

This is non-negotiable. Mixing personal and business finances creates accounting nightmares, makes HMRC investigations more likely, and causes director's loan account complications. Open a business account immediately - Starling, Tide, and Revolut offer free accounts that open in days.

Receipt Capture from Day One

Every business expense needs a receipt. HMRC can request receipts for any expense you claim. No receipt = no deduction. Snap photos of receipts immediately, forward email receipts to a dedicated folder, and process weekly rather than annually.

Regular Bookkeeping

Monthly bookkeeping takes 30 minutes. Annual catch-up takes 30 hours (and usually results in missed deductions). Set a monthly rhythm: reconcile bank transactions, categorise expenses, review outstanding invoices, and check upcoming bills.

Common First-Year Tax Mistakes

Avoid these errors that trip up new company directors:

1. Missing the Corporation Tax Registration Deadline

You must register within 3 months of starting to trade. Many directors think "I'll wait until I'm profitable" - wrong. HMRC can charge penalties and you'll need the UTR for various purposes.

2. Not Setting Up Payroll

Even paying yourself £1 of salary requires PAYE registration. Set this up before your first payment, not retrospectively.

3. Forgetting Pre-Trading Expenses

Costs from before incorporation are often forgotten. Dig out receipts for market research, training, and setup costs from the past 7 years.

4. Wrong VAT Decision

Both registering unnecessarily and failing to register when mandatory are costly. Model your expected turnover and customer base before deciding.

5. Mixing Personal and Business Finances

Using your personal account "temporarily" creates messy director's loan account situations and accounting headaches.

6. No Receipt System

"I'll sort receipts later" leads to lost deductions. HMRC doesn't accept "I definitely spent it" without proof.

7. Ignoring Year-End Planning

Waiting until after your year-end to think about tax planning means missing opportunities that only exist before the accounting period closes.

8. Taking Too Much Too Soon

Extracting more than the company can afford creates overdrawn director's loans, triggering Section 455 tax at 33.75%. Understand your profit position before taking significant funds.

Frequently Asked Questions

When should I start tax planning for my new company?

Start immediately. The decisions you make in week one (bank account, accounting system, VAT registration) have tax implications. Active tax planning should begin at least 8 weeks before your first year-end, but building the right structure from day one is essential.

Can I change my company's year-end after incorporation?

Yes. File form AA01 with Companies House to change your Accounting Reference Date. You can shorten your accounting period at any time, or extend it once every five years (maximum 18 months). A 31 March year-end is optimal for most UK companies as it aligns with the tax year.

How much should I pay myself in year one if the company isn't profitable yet?

If your company has no profits, you can still pay yourself a salary (this creates a loss that carries forward). However, you cannot pay dividends without accumulated profits. The minimum salary to maintain State Pension credits is £6,725. The optimal salary for tax efficiency is £12,570, but only if the company can afford it.

What if I forget to claim expenses from before I incorporated?

Pre-trading expenses from up to 7 years before trading can be claimed in your first accounts. Gather receipts and records, and include them as if incurred on your first day of trading. If you've already filed your first accounts without them, you may be able to amend within normal time limits.

Should I register for VAT voluntarily as a new company?

Register if your customers are VAT-registered businesses (B2B) or you have significant startup costs to reclaim. Don't register if you mainly sell to consumers (B2C) or if your margins can't absorb the admin cost. The Flat Rate Scheme with the 1% first-year discount can be attractive for service businesses.

How do I claim working from home expenses?

Your company can pay you for business use of your home. The simplest method is £6 per week (£312/year) with no receipts needed. For higher amounts, calculate the proportion of home costs attributable to your office space and document the calculation.

What's the difference between salary and dividends for tax?

Salary is deductible for Corporation Tax and triggers National Insurance. Dividends come from after-tax profits and are taxed at lower rates (8.75% basic rate vs 20% Income Tax). The optimal strategy combines both: £12,570 salary (tax-free) plus dividends from remaining profits.

When is my Corporation Tax actually due?

Corporation Tax is due 9 months and 1 day after your accounting period ends. For a 31 March year-end, payment is due by 1 January. Note: the payment deadline is different from the filing deadline (12 months after year-end). Pay late and you'll be charged interest from day one.

How AccountsOS Helps New Companies

Starting a limited company is overwhelming. Between Corporation Tax, VAT schemes, and PAYE, it's easy to miss something critical or leave money on the table.

AccountsOS is built for new UK limited company directors:

Deadline tracking: Every deadline specific to your company is tracked automatically. Get alerts weeks in advance, not the day before.

Auto-categorisation: Upload receipts and bank statements. AI categorises transactions correctly based on UK tax rules, not generic categories.

Tax planning guidance: Ask "should I register for VAT?" or "what's my optimal salary?" and get answers based on your actual company data.

First year setup: We'll help you choose your year-end, set up payroll, and structure your extraction for maximum tax efficiency.

£19/month: A fraction of an accountant's fee, with AI available 24/7 to answer your questions.

Your first year sets the foundation for your company's financial health. Get the tax structure right from day one.

Learn more about how AccountsOS works or see our guide to setting up a limited company for the complete incorporation process.

Tax rules change frequently. This article reflects UK tax law as of January 2025. Always verify current rates with HMRC or consult a qualified accountant for advice specific to your situation.