Accountant or DIY Tax Return? An Honest UK Guide

If you’ve been wondering should I use an accountant or do my own tax return, you’re not alone. Every January, thousands of UK freelancers and small business owners sit staring at the Self Assessment deadline, asking the same question: should I just do this myself, or pay someone? HMRC’s online system has genuinely improved, and decent software can handle simple returns — but ‘simple’ is doing a lot of heavy lifting in that sentence. Here’s an honest way to decide which camp you’re in.

The detail most people miss: Should I use an accountant or do my own tax return is one of those topics where a little clear information saves a lot of confusion. Let’s break it down properly.

Should I use an accountant or do my own tax return?

DIY works well if your affairs are straightforward: one source of freelance income, simple expenses, no employees, no VAT, no property income — most people in this boat can file in an evening. Accounting software like FreeAgent, QuickBooks or Xero (£10-£30/month) categorises your transactions and can submit your return directly to HMRC, removing most of the maths. It’s worth revisiting this point once a year, as rules, prices and best practice all shift. (We’ve also covered what is the difference between profit and turnover in detail.)

An accountant earns their fee when things get complex: limited companies, directors’ loan accounts, VAT, employing staff, rental income, or claiming allowances like R&D tax relief. Treat this as maintenance, not a one-off project, and it stays painless. You can check the official guidance on filing your Self Assessment tax return with HMRC for the full details.

The detail most people miss: The penalty regime is unforgiving — £100 automatically for filing even a day late, plus interest on unpaid tax — so if you’re disorganised, an accountant’s reminders alone may justify the cost. It’s worth revisiting this point once a year, as rules, prices and best practice all shift.

What to do step by step

Enough theory — here’s how to handle this in practice. These are the steps I’d actually follow:

• Consider the value of your time: if your billable rate is £50/hour and the return takes you six stressful hours, a £300 accountant fee is arguably cheaper. Your accountant, if you have one, should be flagging things like this proactively.
• Many accountants offer a hybrid: you do the bookkeeping in software, they review and file the return. This keeps costs down while keeping a professional safety net. This is one of those areas where an hour of proper attention saves weeks of firefighting.
• Whichever route you choose, the legal responsibility stays with you — HMRC fines the taxpayer, not the accountant, so stay engaged even if you outsource. Your accountant, if you have one, should be flagging things like this proactively.
• You can switch mid-stream: plenty of people DIY for the first year or two, then hire an accountant as income and complexity grow. This is one of those areas where an hour of proper attention saves weeks of firefighting.

Related reading: our guide to how do I get wholesale suppliers for a uk retail business pairs well with everything above.

Common mistakes to avoid

A quick word on what not to do — these are the traps I see people fall into most often:

• Ignoring the paperwork until there’s a problem — by then your options are limited and expensive.
• Taking advice from social media instead of official sources — confidently wrong is still wrong.
• Choosing the cheapest option without checking what’s actually included — false economies are everywhere in business.
• Putting it off because it feels complicated — most of these tasks take under an hour once you actually start.

My honest take

My honest opinion? Start DIY if you’re a simple sole trader — you’ll learn how your business finances actually work, which is valuable knowledge. But the moment you incorporate, hire anyone, or find yourself dreading January, get an accountant. The peace of mind is worth more than the fee, and a good one usually finds savings you’d never have spotted.

The broader point is worth stating plainly: should I use an accountant or do my own tax return isn’t just admin — it’s one of those unglamorous foundations that separates businesses that last from those that flame out. Spend the time now, do it properly, and you’ll barely think about it again. Neglect it, and it has a habit of becoming urgent at the worst possible moment.

For independent further reading, MoneySavingExpert’s tax and self-employment guides is a solid next stop.

Quick answers

What’s the single most important thing to know about should I use an accountant or do my own tax return?
DIY works well if your affairs are straightforward: one source of freelance income, simple expenses, no employees, no VAT, no property income — most people in this boat can file in an evening. Treat this as maintenance, not a one-off project, and it stays painless.

Where should I start?
Accounting software like FreeAgent, QuickBooks or Xero (£10-£30/month) categorises your transactions and can submit your return directly to HMRC, removing most of the maths. Begin there and build from a solid foundation rather than trying to do everything at once.

What’s the biggest mistake people make?
Ignoring the paperwork until there’s a problem — by then your options are limited and expensive. Avoid that trap and you’re already ahead of most people.

Putting it into action

Reading about should I use an accountant or do my own tax return is the easy part — acting on it is what actually moves your business forward. Here’s a simple checklist to go from reading to doing within the next seven days. None of these steps takes more than an hour, and together they cover the essentials properly.

• Block out one focused hour this week to complete the single most important action from the practical steps above — momentum beats perfection every time.
• Gather the relevant documents and information into one folder, digital or physical, so everything is ready when you sit down to do the task.
• Set a calendar reminder to review this area in three months — tax rules, prices and your business situation all change, and a quick review keeps you ahead.

The bottom line

Should you use an accountant or do your own tax return? DIY suits simple sole traders using decent software; hire an accountant for limited companies, employees, VAT or anything complex. Factor in your hourly value and the penalty risk, and remember you can start DIY and upgrade later. Either way, the legal responsibility is yours. And if this raised more questions, our piece on how do I write terms and conditions for my website is worth a look next.