Self Assessment Accountants for Small Business Owners

If you’re self-employed, a company director, or a landlord, Self Assessment can quickly become confusing, time-consuming, and stressful — especially if you’re unsure what you need to declare or when things are due.

At Atreus Accountants, we help small business owners handle Self Assessment properly, proactively, and without last-minute panic. Our focus is on saving you time, money, and stress, not just submitting a form once a year.

Who Needs to Complete a Self Assessment Tax Return?

You’ll usually need to file a Self Assessment tax return if you are:

• Self-employed or a sole trader

• A company director

• A landlord with rental income

• Receiving additional untaxed income

• Required by HMRC to submit a return

If you’re not sure whether Self Assessment applies to you, it’s important to check early — penalties can apply even if no tax is owed. Our 👉 UK small business tax deadlines guide explains the key dates and what happens if they’re missed.

What Our Self Assessment Service Includes

We don’t believe Self Assessment should be rushed or reactive. Our service is designed to give you clarity throughout the year, not just in January.

Our Self Assessment support typically includes:

• Reviewing your income and expenses

• Ensuring allowable expenses are claimed correctly

• Preparing and submitting your Self Assessment tax return

• Calculating tax liabilities clearly and accurately

• Advising on payments on account and cash flow planning

• Dealing with HMRC queries where required

Where needed, we’ll also advise on improving record-keeping and using the right systems to make future returns easier.

Proactive Support — Not Just a Once-a-Year Filing

Many people come to us after experiencing:

• Rushed January submissions

• Unexpected tax bills

• Conflicting advice

• Little or no explanation from their accountant

Our approach is different. We prefer ongoing relationships, where we understand your situation properly and can give advice before problems arise — not after.

If you also need help keeping records organised during the year, our 👉 bookkeeping and cloud accounting services work hand-in-hand with Self Assessment to reduce errors and surprises.

Preparing for Future Tax Changes

HMRC is moving towards more frequent and digital reporting. If you’re self-employed or receive property income, upcoming changes under 👉 Making Tax Digital for Income Tax (MTD for ITSA) are likely to affect you in the future.

We help clients prepare early, so these changes don’t come as a shock — and so systems are already in place when requirements become mandatory.

You can also read our plain-English overview here:
👉 Making Tax Digital explained for small businesses

See if Making Tax Digital (MTD for ITSA) is needed for you:

👉 Do i need to sign up for Making Tax Digtal for Income Self-Assessment (MTD for ITSA)?

Who We’re Best Suited For

Our Self Assessment service is ideal if you:

• Want things done properly, not rushed

• Value clear explanations and proactive advice

• Prefer an ongoing relationship rather than one-off filing

• Want to reduce tax stress and uncertainty

• Are growing or expect your income to change

We’re probably not the right fit if you’re only looking for the cheapest possible submission with no advice or support.

Why Work With Atreus Accountants?

• Friendly, straightforward communication

• Proactive planning, not last-minute panic

• Clear fees with no surprises

• Advice tailored to your situation — not generic templates

• A long-term approach focused on saving you time and money

Our aim is to make tax one less thing you have to worry about.

Free Self Assessment Discovery Call

If you’re unsure whether you need to submit a return, worried about a deadline, or want a more proactive approach to Self Assessment, we offer free discovery calls.

This is a no-pressure conversation to understand your situation and explain how we can help.

👉 Book a free discovery call with Atreus Accountants

Self Assessment FAQs

When is the Self Assessment deadline?
Online tax returns and payment are usually due by 31 January following the end of the tax year.

Do I need to file if I made no profit?
Often yes — penalties can apply even if no tax is owed.

Can you deal with HMRC on my behalf?
Yes. We can handle HMRC correspondence and queries related to your return.

Can you help me reduce my tax bill?
We ensure all allowable expenses and reliefs are claimed and advise proactively where possible.