🐝 Start-Up Survival Tips: Tax Basics Every New Business Owner Should Know

5 practical tips to help you understand your tax responsibilities, avoid expensive mistakes and prepare for your first tax bill.

Starting your own business is exciting. You've probably spent weeks or months developing your idea, building your website, finding customers and getting everything ready for your first sale.

But there's one thing that often gets pushed to the bottom of the to-do list: tax.

For many new business owners, tax can feel like a completely different language. Self-Assessment, Corporation Tax, VAT, National Insurance, allowable expenses… Where do you even begin?

And when you're just starting out, hiring an accountant might not be at the top of your budget.

The good news is that you don't need to become a tax expert overnight. However, understanding a few important rules from the beginning can save you money, help you avoid penalties and make managing your finances much easier.

In the third part of our Start-Up Survival Tips series, we're looking at five important areas of tax that every new business owner should understand, with practical examples and steps you can follow yourself.

1. Register Your Business Correctly – And Know What You're Responsible For

One of the first things you need to understand is that your tax responsibilities depend on how your business is structured.

The two most common structures for small businesses in the UK are sole trader and limited company.

If you're a sole trader

Being a sole trader means you're running your business as an individual. You and your business are legally the same person.

You generally pay Income Tax on your taxable business profits, alongside any other taxable personal income you receive.

If your gross income from self-employment exceeds £1,000 in a tax year, you'll normally need to register for Self-Assessment, although there are exceptions and circumstances where you may need to register even below this amount. This threshold is increasing to £3,000 from April 2027.

The £1,000 threshold relates to your income before expenses, not your profit.

Here's an example:

Imagine you start a small handmade jewellery business.

During your first year, you:

• Sell £3,000 worth of jewellery.
• Spend £2,200 on materials, packaging and other business expenses.
• Make £800 profit.

Although your profit is only £800, your gross trading income exceeds £1,000, so you would normally need to register for Self-Assessment.

How to register as a sole trader

Step 1: Visit the HMRC website and find the Self-Assessment registration service.

Step 2: Register as self-employed if you haven't previously registered.

Step 3: Provide the requested personal and business information, including when you started trading.

Step 4: Keep your Unique Taxpayer Reference (UTR) somewhere safe once HMRC issues it.

Step 5: Make a note of your first tax return deadline.

The UK tax year runs from 6 April to 5 April.

Generally, you must notify HMRC by 5 October following the end of the tax year in which you first became required to register.

For example, if you start trading in November 2026, your first tax year ends on 5 April 2027. You would normally need to register by 5 October 2027 and submit your online tax return by 31 January 2028.

If you're running a limited company

A limited company is a separate legal entity from its owners.

This means the company has its own tax responsibilities, separate from your personal tax affairs.

You'll generally need to:

• Register the company with Companies House. https://beebalanced.co.uk/company-formation
• Ensure HMRC is notified when the company starts business activity for Corporation Tax purposes.
• Keep appropriate company accounting records.
• Prepare annual accounts.
• Submit Company Tax Returns.
• Pay Corporation Tax on taxable company profits.
• Consider your personal tax position when taking money out of the company.

One particularly important point is that money in your limited company's bank account isn't automatically your personal money.

Taking money out of a company needs to be recorded correctly, whether it's salary, dividends, reimbursement of expenses or a director's loan.

Incorrectly recording these payments can create unexpected tax consequences.

🐝 Bee Balanced Tip

Don't automatically assume a limited company will save you tax.

The best structure depends on several factors, including your expected profits, other income, personal circumstances, how much money you need to withdraw and your longer-term business plans.

A limited company can offer advantages, but it also brings additional administrative responsibilities and costs.

If you're unsure, it's worth comparing both options before making a decision.

2. Understand What You Actually Pay Tax On – With Real Examples

One of the biggest misconceptions among new business owners is that tax is calculated on all the money coming into their business.

Fortunately, that's not generally how it works.

For most businesses, tax is based on taxable profit, not total sales.

Let's look at a simple example.

Example: A small beauty business

Sarah starts her own beauty business and rents a treatment room.

During her first year, she earns £30,000 from providing treatments.

Her business expenses include:

Assuming all these costs qualify as deductible business expenses:

Annual turnover: £30,000

Allowable expenses: £9,000

Business profit: £21,000

Sarah's starting point for calculating her Income Tax is therefore £21,000, rather than the full £30,000 she received from customers.

However, this doesn't automatically mean she pays tax on the entire £21,000.

Her final tax calculation will also depend on factors such as:

• Her Personal Allowance.
• Whether she has income from another job.
• Any other taxable income.
• Relevant tax reliefs and allowances.
• National Insurance contributions.

For example, someone running a business alongside a full-time job may have a different tax bill from someone whose business is their only source of income.

What if your business makes a loss?

Many businesses don't make a profit immediately.

You might spend more on equipment, marketing and other start-up costs than you earn during your first few months.

If your allowable business expenses exceed your income, you may have a trading loss.

Depending on your circumstances, you might be able to use that loss to reduce tax on other income or carry it forward against future trading profits.

However, loss relief is subject to specific rules, so it's important to understand which reliefs are available before claiming.

Don't confuse profit with money in the bank

This is another common mistake.

Imagine you've made £10,000 profit but have £4,000 of unpaid customer invoices.

Your accounts might show a healthy profit, but that doesn't necessarily mean you have enough cash available to pay your tax bill.

This is why understanding both profit and cashflow is so important.

If you missed our previous article, Understanding & Managing Cashflow, it's worth reading alongside this one.

🐝 Bee Balanced Tip

Get into the habit of reviewing your estimated profit every month.

You can start with three simple figures:

Total business income – allowable business expenses = estimated profit

This won't necessarily equal your final taxable profit, because accounting adjustments and tax rules may apply, but it provides a useful starting point.

The sooner you understand whether your business is actually making money, the easier it becomes to plan for tax.

3. Learn Which Expenses You Can Claim – And Avoid Common Mistakes

Claiming legitimate business expenses is one of the simplest ways to reduce your taxable profit.

However, it's also an area where new business owners frequently make mistakes.

Some people don't claim expenses they're entitled to, while others assume anything paid from their business bank account automatically qualifies.

Neither approach is ideal.

What makes an expense allowable?

For sole traders, the general rule is that expenses must be incurred wholly and exclusively for business purposes.

Some expenses have a mixture of business and personal use. In certain circumstances, you can claim the identifiable business proportion.

Let's look at some examples.

Working from home

If you run your business from home, you may be entitled to claim certain home-working expenses.

This could include an appropriate proportion of:

• Electricity and heating.
• Council Tax.
• Rent or mortgage interest.
• Internet and telephone costs.

There are different methods available for calculating home-working expenses, including simplified expenses for eligible sole traders.

Practical example:

Imagine you use a room in your home as an office for part of the week.

You shouldn't simply claim 25% of your household bills because you have four rooms.

Instead, you need to consider factors such as the space used, the time spent working there and the nature of the expense.

Alternatively, you may qualify to use HMRC's simplified expenses method.

The best approach depends on your circumstances.

Using your personal car for business

If you use your personal car for business journeys, you may be entitled to claim mileage expenses.

From 6 April 2026, HMRC increased the mileage allowance for cars and vans to:

• 55p per mile for the first 10,000 qualifying business miles.
• 25p per mile for additional qualifying business miles.

Practical example:

Imagine you run a small business and travel 3,000 miles during the year visiting clients, attending networking events and collecting business supplies.

Your potential mileage deduction would be:

3,000 miles × £0.55 = £1,650

That's £1,650 you could deduct from your taxable business profits, provided the journeys qualify and you're eligible to use the simplified mileage method.

Remember, ordinary commuting and personal journeys aren't allowable business mileage.

Keep a record of your journeys, including dates, destinations, mileage and business purposes.

Different rules can apply to limited companies and company vehicles.

Equipment and software

Common examples include:

• Laptops and computers.
• Business software subscriptions.
• Website hosting.
• Office furniture.
• Professional equipment.
• Business telephone costs.

However, purchasing equipment doesn't always mean you can automatically deduct the full amount as an ordinary expense.

Depending on your business structure, accounting method and the type of purchase, capital allowances or other tax rules may apply.

Training courses

Training can be an allowable expense, but the rules are more complicated than many people realise.

For sole traders, training that updates existing skills or helps you develop skills for your current business may qualify.

Training that is primarily intended to start a completely new business activity may be treated differently.

It's worth checking before claiming expensive qualifications or courses.

Five expenses you should be particularly careful about

1. Everyday clothing

Ordinary clothes generally aren't deductible simply because you wear them for work. Qualifying uniforms and protective clothing may be treated differently.

2. Client entertainment

Taking a client out for lunch might be good for your business relationship, but business entertaining is generally not deductible for tax purposes.

3. Personal shopping

Buying something through your business account doesn't automatically make it a business expense.

4. Travel between home and a permanent workplace

Ordinary commuting is generally not an allowable business travel expense.

5. Personal use of business equipment

If you use an item for both business and personal purposes, you may need to restrict the claim or consider other tax consequences.

What about the £1,000 trading allowance?

There's another useful option for some sole traders.

The trading allowance can allow you to deduct up to £1,000 from qualifying trading income instead of claiming actual expenses.

For example:

You earn £4,000 from a small side business.

Your actual expenses are only £250.

If you're eligible, using the £1,000 trading allowance could be more beneficial than claiming the £250 of actual expenses.

You cannot claim both the trading allowance and actual expenses against the same trading income.

It's worth comparing the options before completing your return.

🐝 Bee Balanced Tip

Keep a separate folder for expenses you're unsure about.

Rather than ignoring a potentially allowable expense or claiming something incorrectly, save the receipt and make a note of why you purchased it.

You can review these items before preparing your tax return.

A small amount of organisation throughout the year can prevent missed deductions and unnecessary tax payments.

4. Know Your Tax Deadlines – Especially Your First Tax Bill

Missing a tax deadline can result in penalties and interest.

But one of the biggest surprises for new sole traders isn't necessarily the filing deadline.

It's discovering that their first Self-Assessment payment can be significantly higher than expected.

Let's look at why.

Important Self-Assessment deadlines

For sole traders using the standard Self-Assessment system:

These dates relate to the relevant tax year, so always check which return you're completing.

Why your first tax bill might be bigger than expected

This is something I particularly want new business owners to understand.

Under Self-Assessment, HMRC may require you to make payments on account towards the following year's tax bill.

These are advance payments based on your previous year's liability.

They're generally required when your relevant Self-Assessment liability exceeds £1,000, unless enough of your tax was already collected at source.

Let's look at an example.

Example: Your first £4,000 tax bill

Imagine you start your business in April 2026.

You complete your first tax return for the year ending 5 April 2027.

Your Income Tax and relevant National Insurance liability is £4,000.

You might expect to pay £4,000 by 31 January 2028.

However, assuming payments on account apply, HMRC could ask for:

Suddenly, your first January payment is £6,000 rather than £4,000.

The additional £2,000 isn't an extra tax charge. It's an advance payment towards the following tax year.

But if you haven't budgeted for it, it can create a serious cashflow problem.

Can you reduce payments on account?

If you reasonably expect your next year's tax liability to be lower, you may be able to apply to reduce your payments on account.

However, you should only do this when you have a reasonable basis for the reduction.

Reducing them too far can result in interest being charged on the shortfall.

What about limited company deadlines?

Limited companies have different filing and payment requirements.

For most small private limited companies:

• First annual accounts are generally due 21 months after incorporation.
• Subsequent annual accounts are generally due nine months after the financial year-end.
• Corporation Tax is normally payable nine months and one day after the end of the relevant accounting period.
• Company Tax Returns are normally due 12 months after the end of the relevant accounting period.

There are exceptions, and the first accounting period can require particular attention.

🐝 Bee Balanced Tip

Create a simple tax calendar as soon as you start trading.

Include your registration deadlines, tax return dates, expected payments and any VAT or payroll deadlines that apply.

Set reminders at least one month before each deadline.

And remember: the deadline for paying tax isn't always the same as the deadline for submitting the return.

5. Plan Ahead for Tax, VAT and Making Tax Digital

Understanding your tax responsibilities is important, but planning for them is what makes running your business less stressful.

There are three areas I'd encourage every new business owner to monitor regularly.

A. Put money aside for tax

One of the easiest habits you can build is transferring money into a separate savings account for tax.

A common starting point is to reserve around 20–30% of profits, but this is only a rough budgeting guide.

The amount you actually need depends on your tax rates, other income, business structure and circumstances.

For some people, particularly those with employment income alongside their business, this percentage may be insufficient.

Here's a practical approach:

1. Calculate your estimated business profit each month.
2. Estimate the Income Tax and National Insurance or Corporation Tax that may be payable.
3. Transfer the estimated amount into a separate tax savings account.
4. Review the estimate every three months.
5. Adjust your savings as your profits change.

If you operate through a limited company, remember that the company's Corporation Tax and your personal tax liabilities are separate.

B. Keep an eye on the VAT threshold

Many new businesses assume VAT is something they only need to think about when they're much bigger.

However, businesses can grow quickly, and VAT registration can become compulsory sooner than expected.

The UK VAT registration threshold is currently £90,000 of taxable turnover.

Importantly, this isn't based on your profit.

It's also not simply based on your turnover during your financial year.

You generally need to monitor your taxable turnover over a rolling 12-month period.

For example, if your taxable turnover between November 2026 and October 2027 exceeds £90,000, you may need to register for VAT, even if your accounting year ends in March.

There is also a separate test where you expect taxable turnover to exceed the threshold in the next 30 days alone.

VAT can become particularly complicated if you sell overseas, provide certain exempt services or operate through online marketplaces.

Some businesses also choose to register voluntarily before reaching the threshold.

C. Prepare for Making Tax Digital

Making Tax Digital for Income Tax is changing how many sole traders and landlords keep records and report information to HMRC.

The system is being introduced in stages.

For these purposes, qualifying income generally means your combined gross income from self-employment and property before expenses, rather than your profit.

If Making Tax Digital applies to you, you'll generally need to:

• Keep digital records using compatible software.
• Submit quarterly updates to HMRC.
• Complete your year-end tax reporting.
• Continue paying your tax by the applicable deadlines.

Not every new business will be affected immediately.

However, if you're starting a business now, it's worth thinking about your bookkeeping system with these future requirements in mind.

A spreadsheet might be suitable for some smaller businesses, but those required to comply with Making Tax Digital will need an appropriate software solution.

🐝 Bee Balanced Tip

Don't wait until you reach the VAT threshold or receive an HMRC letter before reviewing your systems.

A simple monthly routine can help you stay ahead:

• Check your turnover for the previous 12 months.
• Review your estimated annual profit.
• Update your tax savings.
• Check whether any upcoming reporting requirements apply.
• Make sure your bookkeeping records are up to date.

Spending 20 minutes on this each month can help prevent much bigger problems later.

Final Thoughts: Getting Tax Right Doesn't Have to Be Complicated

Starting a business comes with enough challenges without constantly worrying about whether you're doing something wrong with your tax.

The important thing is to build good habits early.

You don't need to memorise every tax rule or spend hours researching legislation.

But you should understand your basic responsibilities, keep accurate records, monitor your profits and know when it's time to ask for professional advice.

And remember, good tax planning isn't about finding loopholes or avoiding your responsibilities. It's about understanding the rules, claiming what you're entitled to and making informed financial decisions.

Even if you're not ready to hire an accountant or bookkeeper, taking these steps now will make managing your business much easier as it grows.

🐝 Need a Little Help Understanding Your Business Taxes?

At Bee Balanced Accountancy, I understand that when you're just starting out, every penny matters.

That's why I'm creating this free Start-Up Survival Tips series — to help new business owners feel more confident managing their finances, even if they're not quite ready to outsource their bookkeeping.

If you've recently started a business and aren't sure whether you've registered correctly, what expenses you can claim or how to prepare for your first tax bill, I'd be happy to have a chat.

I offer a free 15-minute introductory call where we can discuss your questions and identify what you might need help with.

No pressure, no complicated jargon — just friendly, practical guidance.

👉 email to hello@beebalanced.co.uk

Bee Balanced Accountancy – Supporting small businesses in Didsbury, South Manchester and beyond.

✨ Quick Summary: 5 Things to Remember

Starting a business means taking responsibility for your taxes, but a little preparation can make everything much easier.

1. Register correctly: Understand whether you're operating as a sole trader or limited company and what HMRC expects from you.
2. Know your taxable profit: Tax isn't generally calculated on your total sales. Understanding your allowable expenses helps you estimate your liability.
3. Claim legitimate expenses: Keep receipts, understand the rules and don't miss deductions you're entitled to.
4. Prepare for deadlines: Remember that your first Self Assessment bill could include advance payments towards the following year.
5. Plan ahead: Save for tax, monitor the VAT threshold and prepare for Making Tax Digital where applicable.

A little organisation today can save you a lot of stress tomorrow.

Disclaimer: This article provides general information about UK business taxes as at October 2026. Tax treatment depends on individual circumstances, and rules and thresholds can change. Always check current HMRC guidance or seek professional advice before making tax decisions.