Tax Checklist for New UK Companies: What to Do After Incorporation

Starting a UK limited company is exciting. The less exciting part is keeping up with HMRC, Companies House, VAT, payroll and the records that make your tax return possible. The good news is that tax compliance becomes much easier when you treat it as a system rather than something to deal with once a year. For most new UK companies, the key is to set up the right registrations, records, accounts and deadlines from the beginning. Waiting until the first tax bill arrives can turn a simple process into an expensive clean-up exercise.

This tax checklist for new UK companies covers the essentials, from your first days after incorporation through VAT, payroll, Corporation Tax, annual accounts and more advanced considerations for growing and international businesses.

Important: Tax rules and thresholds can change. The information below reflects UK rules and guidance available in 2026, but businesses should check the latest HMRC and Companies House guidance or obtain professional advice for their specific circumstances.

Quick Tax Checklist for a New UK Company

Before getting into the detail, here is the short version:

• Confirm your company is registered correctly with Companies House.
• Set up access to HMRC's online business tax services.
• Check your Corporation Tax obligations.
• Understand your accounting period and filing deadlines.
• Open a dedicated business bank account.
• Keep proper accounting records from day one.
• Track taxable turnover for VAT purposes.
• Register for VAT when required, or consider voluntary registration.
• Register for PAYE before paying employees or directors where required.
• Keep payroll and employee records.
• Record business expenses and retain supporting evidence.
• Separate company money from personal money.
• Track dividends and director payments correctly.
• Keep company and accounting records for the required period.
• Review whether your business has international tax obligations.
• Put important tax deadlines in your calendar.
• Consider using an accountant before the business becomes complicated.

Now let's look at each step in more detail.

1. Confirm Your Company and Tax Details

Once your limited company has been incorporated, don't assume the administrative work is finished. Your company has its own legal identity and tax responsibilities. Make sure you have your Companies House information, company number, registered office details and other incorporation records safely stored.

You should also make sure you can access the relevant HMRC online services for your company. This matters because Corporation Tax, PAYE, VAT and other obligations may involve different HMRC services and references.

Practical tip: Create a secure digital folder containing your incorporation documents, HMRC correspondence, tax references, accounts, invoices, receipts and bank statements. Your future accountant will thank you for it.

2. Understand Your Corporation Tax Responsibilities

A UK private limited company normally needs to prepare annual accounts and a Company Tax Return after the end of its financial year. There are several dates to understand:

• Annual accounts: generally due at Companies House nine months after the company's financial year ends.
• Corporation Tax: normally due nine months and one day after the end of the Corporation Tax accounting period.
• Company Tax Return: generally due 12 months after the end of the Corporation Tax accounting period.
• First accounts: normally due 21 months after incorporation.

These are different deadlines. That distinction is important. For example, a founder might assume that because the Company Tax Return is not due for another few months, there is nothing to do. In reality, the Corporation Tax payment deadline may arrive earlier. Your company remains responsible for meeting its filing and payment obligations even if an accountant prepares and submits the returns.

What should you track?

At minimum, maintain a simple tax calendar showing:

Financial year-end → accounts deadline → Corporation Tax payment deadline → Company Tax Return deadline.

Never rely solely on memory or on receiving a reminder from HMRC.

3. Start Keeping Accounting Records From Day One

Good tax compliance starts with good bookkeeping. Your records should show money coming into and going out of the company, including sales invoices, supplier invoices, receipts, bank transactions and other relevant financial information.

Companies are generally required to keep accounting records for six years from the end of the relevant financial year, with circumstances that can require records to be kept longer. A new company should therefore establish a record-keeping system immediately.

A simple system for beginners

Keep separate folders for:

• Sales invoices
• Purchase invoices
• Receipts
• Bank statements
• Payroll
• VAT
• Corporation Tax
• Director expenses
• Dividends
• Loans
• Contracts
• Assets

Cloud accounting software can make this much easier, particularly when transactions start increasing. The objective is not simply to satisfy HMRC. Clean records give you a clearer picture of whether the company is actually profitable.

4. Keep Company and Personal Money Separate

One of the most common mistakes new founders make is treating the company bank account like a personal wallet. A limited company is legally separate from its owners. If you pay personal expenses from the company account, receive company income into a personal account or move money between accounts without recording what it represents, your bookkeeping can quickly become confusing. Suppose you transfer £2,000 from the company to your personal account. Was it:

• salary?
• dividend?
• reimbursement of expenses?
• repayment of money you previously lent the company?
• a director's loan?

Those transactions can have very different accounting and tax consequences. Rule of thumb: Every movement of money between you and your company should have a clear explanation and supporting record.

5. Monitor VAT Before You Reach the Threshold

VAT is one of the areas where new companies can get caught out because registration is based on taxable turnover rather than simply whether the company "feels big enough." The current UK VAT registration threshold is £90,000 of taxable turnover. You generally must register if your taxable turnover for the previous 12 months exceeds £90,000, or if you expect it to exceed £90,000 in the next 30 days. Voluntary registration below the threshold is also possible. The important point is to monitor turnover continuously. Don't wait until the end of your financial year.

Example

Imagine a new consulting company generates:

• Month 1–3: £18,000
• Month 4–6: £22,000
• Month 7–9: £25,000
• Month 10–12: £28,000

The business has reached £93,000 of turnover across the relevant 12-month period. The founder needs to examine the VAT rules and registration requirements rather than simply waiting for the company's year-end. VAT can also become more complicated when you sell internationally, import goods or provide different types of services. This is one point where speaking to an accountant before registration can prevent expensive mistakes.

6. Set Up PAYE If You Employ People

If your company employs staff, payroll becomes another important part of tax compliance. A company generally needs to register as an employer with HMRC before its first payday. This can also apply when the only person being paid is a director of a limited company. PAYE involves more than simply transferring salaries. You need to:

• Calculate employee pay.
• Deduct Income Tax and National Insurance where applicable.
• Report payroll information to HMRC.
• Keep payroll records.
• Pay amounts due to HMRC.
• Deal with employee benefits and expenses where relevant.

HMRC states that payroll information should be reported on or before the first payday. For a founder employing one or two people, payroll software may be manageable. As the workforce grows, outsourcing payroll can save considerable administrative time.

7. Get Your Director's Salary and Dividends Right

Many owner-managed companies use a combination of salary and dividends to extract money from the business. But a dividend is not simply "money I take from the company."

Dividends must be paid from available profits and properly documented. The company should also maintain appropriate dividend records and paperwork. Salary, meanwhile, is processed through payroll and can involve PAYE and National Insurance obligations. This distinction becomes particularly important as profits grow.

Practical takeaway: Don't transfer money to yourself first and decide what it was later. Decide what the payment represents, record it correctly and retain the supporting documentation.

8. Claim Legitimate Business Expenses — But Keep Evidence

Tax planning isn't about finding ways to label everything as a business expense. It is about identifying legitimate costs connected with running the company and recording them correctly. Depending on the circumstances, businesses may have costs such as:

• Office expenses
• Software subscriptions
• Professional fees
• Business insurance
• Advertising
• Business travel
• Equipment
• Telephone and internet costs
• Training
• Professional memberships

Keep the invoice or receipt and record what the expense was for. A useful test is simple: Could you explain this expense clearly to an accountant or HMRC several years from now? If the answer is no, your record keeping probably needs improvement.

9. Understand the Difference Between Profit, Cash and Tax

This is one of the most important lessons for a new founder. Cash in the bank is not necessarily profit. A company could have £50,000 in its bank account while owing suppliers, VAT, payroll taxes and Corporation Tax.

Conversely, a profitable business can experience a cash-flow problem because customers have not yet paid their invoices. For tax purposes, accounting profit and taxable profit are not always identical either. That is why founders should avoid looking at their bank balance and assuming they can safely withdraw the money. A simple monthly management report showing:

• Revenue
• Gross profit
• Operating expenses
• Net profit
• Cash balance
• VAT owed
• PAYE owed
• Corporation Tax provision
• Outstanding customer invoices

can provide a far better picture of the company's financial health.

10. Don't Ignore Making Tax Digital

Making Tax Digital (MTD) is increasingly important in the UK's tax system. For new limited companies, Corporation Tax compliance has its own digital filing requirements. From 1 April 2026, companies generally need commercial software to file Company Tax Returns with HMRC because the previous joint online accounts and Company Tax Return service closed on 31 March 2026.

There is also a separate MTD regime for Income Tax affecting sole traders and landlords. From 6 April 2026, eligible sole traders and landlords with qualifying income above £50,000 must use MTD for Income Tax. The threshold is scheduled to reduce to more than £30,000 from April 2027 and more than £20,000 from April 2028. This distinction matters if you're running both a limited company and a separate sole-trader activity.

11. Keep an Eye on International Tax Issues

For global founders, UK company tax compliance can become more complicated very quickly. You might have:

• A UK company owned by a non-UK resident.
• Customers in several countries.
• Employees working overseas.
• Foreign suppliers.
• Foreign currency transactions.
• Software subscriptions from overseas businesses.
• Goods imported into or exported from the UK.

VAT rules can differ depending on what you sell, where your customer is located and whether the customer is a business or consumer. There can also be questions around personal tax residence, permanent establishments, double-taxation agreements and overseas reporting.

A UK company formation service can help with company formation and administrative management, but it should not be treated as a substitute for specialist tax advice. This is where platforms such as IncorpUK, which supports UK company formation and management for global founders, fit naturally into the wider business setup process: company administration and tax advice are related, but they are not the same thing.

12. Know When to Hire an Accountant

You do not necessarily need an accountant on the day you incorporate. A very simple company with one founder, few transactions and no employees may be able to manage basic bookkeeping and compliance with appropriate software and careful research. But the case for professional help becomes stronger when:

• Revenue is increasing quickly.
• VAT registration is approaching.
• You employ people.
• You pay yourself through salary and dividends.
• You have multiple shareholders.
• You are taking investment.
• You buy significant assets.
• You have loans or director's loan accounts.
• You sell internationally.
• You operate across several countries.
• Your bookkeeping is falling behind.
• HMRC contacts you about an issue.
• You spend more time on administration than on running the business.

The best time to hire an accountant is often before the complicated transaction happens, not after the mistake has been made.

A Practical Tax Calendar for New UK Companies

FAQs About Tax for New UK Companies

Do all new UK companies need an accountant?

No. There is no general rule requiring every small limited company to appoint an accountant. A founder can manage certain accounting and tax tasks themselves. However, professional advice becomes increasingly valuable as the company's transactions, tax obligations and financial decisions become more complicated.

When does a new company pay Corporation Tax?

Corporation Tax is normally due nine months and one day after the end of the company's Corporation Tax accounting period. The Company Tax Return is generally due 12 months after that accounting period ends.

When must a UK company register for VAT?

A business generally must register when its taxable turnover exceeds £90,000 over the previous 12 months, or when it expects taxable turnover to exceed £90,000 in the next 30 days.

Does a limited company need to keep receipts?

Companies should retain appropriate accounting records and supporting documents. Company accounting records generally need to be kept for six years from the end of the relevant financial year, although longer periods can apply in certain circumstances.

Can I pay myself whenever I want from my company?

You can take money from your company in different ways, but each payment should have the correct accounting and tax treatment. Salary, dividends, expense reimbursements and director's loans are not interchangeable.

Does a company need PAYE if it only has one director?

A company may need to register as an employer even where the only person being paid is the sole director. HMRC specifically states that employers must register before the first payday where the relevant conditions apply.

What happens if I miss a tax deadline?

Late filing or payment can result in penalties and interest, depending on the tax and circumstances. The best response is to deal with the issue promptly rather than ignoring HMRC correspondence.

Should I hire an accountant before my first tax return?

Often, yes. Getting advice before the first return can help you establish proper bookkeeping, understand allowable expenses, set up payroll and VAT correctly, and avoid having to reconstruct the company's finances later.

Conclusion: Build Tax Compliance Into the Business From Day One

Tax compliance for a new UK company does not have to be complicated, but it does need to be deliberate. The most important habits are surprisingly simple: keep accurate records, separate personal and company finances, monitor VAT turnover, understand your filing deadlines, deal with payroll properly and plan for Corporation Tax before the bill arrives.

As the company grows, the tax picture can become more sophisticated. International customers, employees, investors, dividends, VAT and multiple revenue streams can all introduce additional considerations. Don't wait for your first tax problem to force you to become organised.

Set up your financial systems early, review your obligations regularly and bring in an accountant when the cost of professional advice is outweighed by the time, risk and opportunities involved. For founders building a UK company from the UK or overseas, good tax administration is not just about avoiding penalties. It creates the financial discipline needed to understand where the business stands, make better decisions and grow with confidence.