Do I Need an Accountant for My Self Assessment? (MTD for Income Tax Explained)

Introduction

At Towerstone we offer accountancy services in Bedford to landlords sole traders and growing companies across the area. This guide called Do I Need an Accountant for My Self Assessment shows you how to work out when DIY is fine and when help pays for itself through accuracy and fewer headaches.

Every year millions of people across the UK face the same question as the Self Assessment deadline approaches. Do I actually need an accountant or can I do my Self Assessment myself? From experience I know this is not just about cost. It is about confidence accuracy time and peace of mind.

Self Assessment is how HMRC collects tax from people whose income is not taxed automatically through PAYE. That includes the self employed landlords company directors and anyone with more complex income. On the surface the tax return looks straightforward but in reality it is easy to miss reliefs misunderstand rules or make mistakes that can cost far more than an accountant’s fee.

In this article I explain what Self Assessment really involves who it applies to how it works in practice and when using an accountant makes sense. I will also be honest about when you probably do not need one. The aim is to help you make an informed decision based on your situation rather than fear or guesswork.

What Is Self Assessment?

Self Assessment is HMRC’s system for collecting Income Tax and in some cases Capital Gains Tax from individuals whose tax is not fully dealt with through PAYE. Instead of tax being deducted automatically you are responsible for reporting your income calculating the tax due and paying it by the deadline.

From my point of view this is where many people underestimate the responsibility involved. HMRC does not calculate your tax for you at the point of submission. You tell HMRC what you owe and they expect it to be correct.

A Self Assessment tax return usually covers income from:

• Self employment or freelance work

• Rental income from property

• Dividends and savings income above allowances

• Capital gains from selling assets

• Foreign income

• Income from multiple jobs or pensions

• Director income not fully taxed at source

Once submitted HMRC can enquire into the return up to 12 months later and longer in cases of carelessness or deliberate error. That is why accuracy matters.

Who Has to Complete a Self Assessment?

Not everyone in the UK needs to file a Self Assessment return. In my experience confusion often arises because people assume they must file simply because they have paid some tax during the year.

You usually need to complete a Self Assessment if you are:

• Self employed with income over £1,000

• A landlord receiving rental income

• A company director receiving dividends

• Earning over £100,000

• Receiving income from abroad

• Claiming certain reliefs such as loss relief

• Making capital gains above the annual exemption

You may not need to file if all your income is taxed through PAYE and you have no other taxable income. However HMRC can still ask you to file even if you believe no tax is due.

One of the first things I do for new clients is confirm whether they actually need to file. You would be surprised how often people file unnecessarily while others fail to file when they should.

How Self Assessment Works in Practice

Self Assessment follows a strict annual cycle. The tax year runs from 6 April to 5 April. After the year ends you prepare your tax return covering that period.

Key dates matter:

• Register for Self Assessment by 5 October

• Submit paper returns by 31 October

• Submit online returns by 31 January

• Pay tax due by 31 January

• Pay first payment on account by 31 January

• Pay second payment on account by 31 July

The return itself involves entering income figures expenses tax already paid and claims for reliefs. HMRC then calculates the tax based on what you submit.

From experience the hardest part is not filling in the boxes. It is knowing what should go in them.

Doing Your Own Self Assessment

Let me be clear. Many people can complete their own Self Assessment successfully. HMRC’s online system has improved and for simple cases it can be manageable.

You might be fine doing it yourself if:

• You have one source of income

• Your expenses are straightforward

• You understand what is allowable

• You are comfortable with numbers

• You keep good records

• You are not claiming complex reliefs

For example a sole trader with modest income and clear expenses may be able to file without professional help especially in the early years.

However what I often see is people filing correctly but inefficiently. They pay more tax than necessary simply because they did not realise what they could claim or how to structure things better.

Common Mistakes I See in DIY Returns

Over the years I have reviewed hundreds of Self Assessment returns that people originally submitted themselves. Certain mistakes come up again and again.

One is underclaiming expenses. People often miss allowable costs such as use of home mileage professional fees subscriptions and capital allowances. HMRC does not prompt you to claim these.

Another is misunderstanding what counts as income. Some people declare gross figures when they should declare net or vice versa. Others mix personal and business income incorrectly.

Errors around payments on account are also common. People do not realise they are paying tax in advance and are shocked by the bill.

Then there are structural mistakes such as claiming reliefs incorrectly or failing to declare income that HMRC already knows about through third party reporting.

Each of these can lead to penalties interest or unnecessary tax.

What an Accountant Actually Does for Self Assessment

Many people assume an accountant just fills in the form. In reality the value lies in interpretation judgement and planning.

When I prepare a Self Assessment return I do far more than input numbers. I review income sources challenge expense categories apply the correct tax treatment and look at the wider picture.

An accountant will:

• Confirm you need to file

• Ensure all income is declared correctly

• Identify allowable expenses and reliefs

• Apply capital allowances properly

• Check tax bands and thresholds

• Review payments on account

• Reduce risk of HMRC enquiry

• Act as agent with HMRC

More importantly a good accountant looks ahead not just backwards. Self Assessment should not be treated as an annual chore. It should inform better decisions during the year.

Self Assessment for the Self Employed

If you are self employed I strongly believe professional support becomes more valuable as income grows.

Self employed tax is not just about income tax. It includes Class 2 and Class 4 National Insurance and often VAT considerations as well.

Decisions around when to buy equipment how to treat assets whether to incorporate and how to manage cash flow all feed into the tax position.

From experience the cost of an accountant is often outweighed by tax saved and mistakes avoided. Especially once profits rise above basic rate thresholds.

Self Assessment for Landlords

Landlords face specific rules that catch people out. Mortgage interest relief changes capital gains rules and allowable expense definitions are not intuitive.

I regularly see landlords miss reliefs or misreport figures because they assume property tax works like normal business tax. It does not.

If you own more than one property or are considering selling or refinancing an accountant can add significant value through planning not just compliance.

Self Assessment for Company Directors

Company directors almost always benefit from using an accountant for Self Assessment.

Directors often receive income from multiple sources including salary dividends benefits pensions and loans. These interact with corporation tax payroll and personal tax.

Director loan accounts dividend timing and pension contributions all affect the personal tax position. Getting this wrong can trigger unexpected tax charges.

In my opinion directors trying to manage this without advice are taking an unnecessary risk.

Cost of Using an Accountant

Cost is often the deciding factor. Fees vary depending on complexity and location but for a straightforward Self Assessment you might expect fees ranging from a few hundred pounds upwards.

That cost usually includes preparation submission and dealing with HMRC queries.

What matters is value not just price. If an accountant saves you more than they cost or prevents a costly mistake the fee pays for itself.

I always encourage people to view accountancy fees as an investment rather than an expense.

When You Probably Do Not Need an Accountant

There are situations where professional help may not be necessary.

If you have:

• One simple income source

• Minimal expenses

• No capital gains

• No rental income

• No relief claims

• Confidence in HMRC guidance

Then doing it yourself may be reasonable. The key is honesty about your own understanding and appetite for risk.

If you feel stressed confused or unsure that is often a sign you would benefit from support.

Peace of Mind and HMRC Enquiries

One overlooked benefit of using an accountant is peace of mind.

If HMRC raises a query having an accountant who prepared the return and understands the figures makes the process far less stressful.

You also reduce the likelihood of enquiry in the first place. Well prepared accurate returns are statistically less likely to be challenged.

From experience clients sleep better knowing someone else has checked the numbers.

Making the Decision

So do you need an accountant for your Self Assessment?

The honest answer is it depends. It depends on complexity confidence time and risk tolerance.

If your situation is simple and you are confident you may not need one. If your income is growing your situation is changing or you want to be sure you are not overpaying tax professional help is usually worth it.

My advice is always the same. If you are asking the question seriously there is probably a reason. At the very least a one off review can highlight issues you may not have considered.

The key takeaway

From years of working with individuals across Bedford and beyond I have seen Self Assessment done well badly and everything in between.

The system is designed to put responsibility on the taxpayer. That responsibility brings opportunity but also risk.

Using an accountant is not about avoiding tax. It is about understanding the rules using them properly and avoiding unnecessary mistakes.

If your Self Assessment feels like a box ticking exercise you may be missing opportunities. If it feels overwhelming you are not alone.

The right level of support makes all the difference.

To continue reading you may find Avoid These Costly VAT Errors: Bedford Accountants Expose Common Pitfalls and How to Choose the Right Accountant for Your Business in Bedford helpful. You can also browse all related guidance in our Bedford Accounting Hub.