Tax Advice: How to Avoid Costly Tax Mistakes

---

Tax can become complicated when you have different sources of income, own rental property, sell investments or run a business. Getting the right tax advice can help you understand your responsibilities, claim the allowances you are entitled to and avoid mistakes that could lead to unnecessary tax bills or penalties.

You do not necessarily need an accountant for every tax question. However, if you are unsure how a particular transaction should be treated, are planning to sell a property or need to report additional income to HMRC, professional advice can help you make informed decisions before problems arise.

This guide explains when you might need tax advice, what a tax advisor can help with and why getting advice before making financial decisions can make a difference.

Table of Contents

• When do you need professional tax advice?
• Tax advice
• Tax advisor
• Tax advice on capital gains
• Tax advice property
• How to choose the right tax professional
• Getting tax advice from Better Accounting Services

When Do You Need Professional Tax Advice?

Many people only think about getting professional help when their Self Assessment tax return is due. However, tax advice can be particularly valuable before making a financial decision.

For example, you might benefit from speaking to an accountant if you:

• Have started working for yourself alongside employment.
• Receive rental income from one or more properties.
• Are planning to sell a buy-to-let property.
• Have received money from an inheritance.
• Want to understand the tax implications of selling shares or investments.
• Have received an unexpected letter from HMRC.
• Are considering setting up a limited company.
• Have undeclared income from previous tax years.

In these situations, understanding the tax implications beforehand can help you avoid unexpected liabilities.

If you wait until after a transaction has taken place, some tax planning opportunities may no longer be available.

If you are unsure how a financial decision could affect your tax position, Better Accounting Services can help you understand the relevant UK tax rules and your reporting responsibilities.

Tax Advice: What Can an Accountant Help You With?

Tax advice covers a wide range of issues affecting individuals, landlords, sole traders and limited companies.

The purpose is not simply to calculate how much tax you owe. It is also about making sure your income and expenses are reported correctly and that you do not pay more tax than necessary.

Self Assessment and personal tax

If you have income outside your regular employment, you may need to complete a Self Assessment tax return.

This could include:

• Self-employment income.
• Rental income from residential property.
• Dividends from company shares.
• Savings and investment income.
• Certain foreign income.
• Capital gains from selling assets.

An accountant can help establish whether you need to register for Self Assessment, calculate your taxable income and prepare the relevant tax return.

You can find out more about who needs to complete a Self Assessment tax return using HMRC’s official guidance.

Tax advice for self-employed people

Running a business means keeping track of income, expenses and tax obligations.

A sole trader may need help understanding which expenses can be claimed, how to calculate taxable profits and when payments must be made to HMRC.

For example, a self-employed tradesperson may be able to claim qualifying costs for tools, business insurance, materials and travel.

However, not every purchase is automatically tax-deductible. The rules depend on the nature of the expense and how it relates to the business.

Tax planning for small businesses

Limited company directors also face decisions that can affect their overall tax position.

These may include:

• Taking money from a company through salary or dividends.
• Claiming business expenses.
• Purchasing equipment and claiming capital allowances.
• Employing family members.
• Managing Corporation Tax liabilities.
• Understanding VAT registration requirements.

Getting advice before making these decisions can help you understand the financial consequences and avoid incorrect accounting treatment.

Tax Advisor: What Should You Expect From One?

A tax advisor helps individuals and businesses understand tax legislation and deal with their tax responsibilities.

Depending on their experience and services, they may provide advice on income tax, capital gains, property income, business expenses, Corporation Tax and other areas of taxation.

A tax advisor may also help you communicate with HMRC, prepare tax calculations and submit tax returns.

Does a tax advisor need professional qualifications?

In the UK, the term tax advisor is not itself a protected professional title. HMRC explains that anyone can call themselves a tax agent, although certain requirements apply when registering to interact with HMRC on behalf of clients.

This means it is worth checking the person’s experience, qualifications, professional memberships and relevant insurance before engaging their services.

HMRC provides useful guidance on choosing a tax agent.

You should also check that the professional understands the particular area of taxation you need help with. Someone experienced in Self Assessment may not necessarily specialise in complex property transactions or international taxation.

Is tax advice different from financial advice?

Yes. Tax advice focuses on the tax treatment of income, assets and financial transactions.

Financial advice, on the other hand, can involve recommendations about investments, pensions, mortgages and other financial products.

An accountant can explain the tax implications of different options without necessarily providing regulated financial advice or recommending a particular investment.

This distinction is particularly relevant when dealing with investments, retirement planning and larger financial decisions.

Tax Advice on Capital Gains: What Should You Know?

Capital Gains Tax (CGT) may apply when you sell or dispose of an asset for more than it cost you.

Common examples include:

• Selling a buy-to-let property.
• Disposing of land.
• Selling shares outside an ISA.
• Selling valuable personal possessions.
• Disposing of certain business assets.

The amount of tax you pay depends on the gain, your available allowances, applicable reliefs and your overall tax position.

What is the Capital Gains Tax allowance?

For the 2026/27 tax year, the annual exempt amount for most individuals is £3,000.

This means you can make qualifying capital gains up to this amount before Capital Gains Tax becomes payable, subject to the applicable rules.

For most individuals, the main CGT rates for 2026/27 are:

Type of taxpayer	CGT rate
Basic rate taxpayer	18%
Higher or additional rate taxpayer	24%

Different rates and rules apply to certain gains, including those qualifying for Business Asset Disposal Relief.

You can check the current figures in HMRC’s Capital Gains Tax rates and allowances guidance. GOV.UK+1

How can an accountant help with Capital Gains Tax?

Calculating a capital gain is not always as straightforward as subtracting the original purchase price from the selling price.

Depending on the asset, you may be able to deduct qualifying acquisition and disposal costs, as well as certain improvement expenditure.

For example, when selling a property, the calculation may involve:

1. Original purchase price.
2. Qualifying purchase costs, such as solicitor and estate agent fees.
3. Qualifying improvement costs.
4. Sale proceeds.
5. Applicable reliefs and losses.
6. Your available annual exempt amount.

An accountant can review the transaction, identify potentially allowable costs and calculate the gain.

If you are considering selling an asset, it is worth understanding the tax implications before completing the transaction.

You can also read our guide on how much accountants charge for Capital Gains Tax calculations.

Tax Advice Property: What Do Landlords and Property Owners Need to Know?

Property taxation is one of the areas where professional advice can be particularly useful.

Landlords need to understand how rental income is taxed, which expenses they can claim and how property transactions affect their overall tax position.

Tax on rental income

If you receive rental income from a property, you will generally need to pay Income Tax on your taxable rental profits.

Your taxable profit is normally calculated by deducting allowable expenses from your rental income.

Common examples of potentially allowable expenses include:

• Property management fees.
• Insurance.
• Repairs and maintenance.
• Council Tax and utility bills where paid by the landlord.
• Certain professional fees.

Residential landlords also need to understand the restrictions on mortgage interest tax relief. Finance costs are generally dealt with through a basic-rate tax reduction rather than a deduction from rental income.

The £1,000 property allowance may also be available in qualifying circumstances, although claiming it means you cannot deduct actual expenses for the same property income.

HMRC explains these rules in its guidance on working out rental income. GOV.UK+1

Selling a rental property

If you sell a property that is not your main residence, you may have to pay Capital Gains Tax on the profit.

For most UK residential property disposals where CGT is due, you must report and pay the tax within 60 days of completion.

This is particularly important because the deadline is separate from the normal Self Assessment filing deadline.

An accountant can help calculate the gain, consider available reliefs and ensure the relevant reporting requirements are met.

Landlords who need help calculating rental profits, checking allowable expenses or preparing their tax returns can use Better Accounting Services for practical accounting and tax support.

You can also read our guide to allowable landlord expenses in the UK.GOV.UK+1

How to Choose the Right Tax Professional

Choosing someone to handle your tax affairs should not be based on price alone.

The right professional should understand your circumstances, explain the relevant rules clearly and provide a service that matches your requirements.

Before engaging an accountant or tax advisor, consider the following:

• Qualifications: Check their accounting or tax qualifications and professional memberships.
• Experience: Ask whether they regularly deal with your particular tax situation.
• Fees: Make sure you understand what is included in the quoted price.
• Communication: Choose someone who explains tax matters in plain English.
• Professional standards: Check their professional memberships, insurance and relevant HMRC registration or supervision.
• Ongoing support: Find out whether advice is included in the service or charged separately.

HMRC also publishes its standard for tax agents, which sets out the standards expected of agents representing taxpayers.

Remember that appointing an accountant does not remove your responsibility for your own tax affairs. You should always review the information submitted to HMRC and make sure it is accurate.

Getting Tax Advice From Better Accounting Services

Better Accounting Services provides accounting and tax support to individuals, sole traders, landlords and small businesses.

Services include:

• Self Assessment tax returns.
• Tax advice and guidance.
• Rental income and landlord tax returns.
• Capital Gains Tax calculations and reporting.
• Bookkeeping and business accounting.
• VAT compliance.
• Limited company accounts and Corporation Tax returns.

The aim is to make tax easier to understand, explain your responsibilities and help you deal with HMRC correctly.

Whether you need help with a single tax question or ongoing accounting support, getting the right advice can help you make better-informed decisions.

Get Practical Tax Advice for Your Circumstances

Not sure how a particular transaction, property or source of income affects your tax position?

Better Accounting Services can help you understand the relevant tax rules, calculate your liabilities and deal with your reporting obligations.

---