Your Self Assessment is due. You’re not sure where to start, or you’ve started and hit a wall, or you’re wondering whether the thing you’re stuck on is worth paying someone to fix. You need help — but “help” covers a wide range, from a free phone call with HMRC to a £2,500/year accountant retainer, and the wrong choice either wastes money or leaves you exposed.
This guide is a map of the help available for your Self Assessment tax return. It doesn’t go deep on any single option — each option has its own dedicated guide that does that. Instead, it helps you work out which type of help you need, what to have ready before you ask for it, and where to go next. For a wider list of free websites and learning resources, see our best Self Assessment resources guide.
If you already know you want to talk to a real accountant rather than keep reading, you can find an accountant through our free matching service — answer a few questions and we’ll match you with someone suited to your situation.
1. Work Out What Kind of Help You Need
Before you Google “tax return help” and end up down a rabbit hole, narrow the problem. There are four types of help, and they solve different problems.
Free HMRC support answers questions and helps you file simple returns yourself. Accounting software helps you track income and expenses through the year so filing is faster — but you still do the filing. An online tax return service takes your records and files the return for you, with no ongoing relationship. A traditional accountant handles everything, advises year-round, and represents you with HMRC if needed.
The mistake most people make is jumping to the first option they find without matching it to their actual problem. If your question is “can I claim this expense?”, HMRC’s helpline can answer it for free. If your question is “I have three income sources and I’m not sure how they interact on the return”, you need a professional — not a helpline, not software. The sections below help you match the problem to the solution.
2. When Free HMRC Help Is Enough
HMRC provides more free support than most people realise, and for a large chunk of sole traders it’s all you need.
The HMRC Self Assessment helpline (0300 200 3310) answers questions about how to file, what counts as income, and how specific sections of the return work. The online guidance on gov.uk covers almost every common scenario in plain language. And the free online filing service itself walks you through each section step by step — for a simple return, it takes 20–40 minutes and costs nothing.
Free help is enough when your return has one income source (a single sole trade or one self-employment alongside PAYE), you’re claiming either the £1,000 trading allowance or straightforward expenses with no capital allowances, your turnover is under £50,000, and you’re up to date with no missed deadlines. If all of that describes you, there’s no reason to pay anyone anything. Our first-year self-employed checklist walks you through the free filing process step by step.
Where free help falls short: HMRC advisers can’t tell you whether you’re using the optimal expense method, can’t advise on tax planning, and won’t review your return for errors before you submit. They’ll explain the rules; they won’t apply them to your specific situation. The moment you need someone to make a judgement call — “should I claim actual expenses or the trading allowance?”, “how do I allocate this across two tax years?” — you’ve outgrown free help.
3. When You Need Paid Help
Paid help exists because free help has a ceiling, and that ceiling is lower than people think.
You need paid help when your return involves judgement calls that HMRC won’t make for you. Multiple income sources that interact on the return (self-employment plus property, plus dividends) each have their own rules, and the way they combine affects your Personal Allowance, payments on account, and tax band. If you’re claiming capital allowances, pension tax relief at the higher rate, or dealing with benefits in kind, the rules have expensive edge cases that a helpline won’t walk you through.
You also need paid help when the cost of getting it wrong exceeds the cost of the help. A single missed relief can cost more than an accountant’s entire fee. A misclassified expense can trigger an HMRC enquiry. And if you’re behind on multiple years, the penalty structure alone is complex enough that doing it yourself risks compounding the problem. In these situations, paying £150–£500 for professional help isn’t an expense — it’s damage limitation.
The question isn’t whether you can file yourself. You legally can. The question is whether the risk of errors and the value of your time make DIY the more expensive option. For a growing share of sole traders, they don’t.
4. What to Have Ready Before You Ask for Help
This is the step almost everyone skips, and it’s the one that saves the most time and money — regardless of which type of help you choose.
Whether you’re calling HMRC, using an online service, or hiring an accountant, the person helping you needs the same core information. Gathering it before you ask means the help session is productive instead of a back-and-forth over missing documents. Here’s what to have ready:
- Your UTR number — your 10-digit Unique Taxpayer Reference. If you’ve filed before, it’s on previous returns and HMRC letters. If you’re newly registered, it arrives by post after you register for Self Assessment.
- Your Government Gateway login — the username and password you use to access HMRC’s online services. If you’ve lost it, recover it before you do anything else; the recovery process can take days.
- Income records for every source — bank statements or invoices for self-employment income, P60s from any PAYE employment, dividend vouchers, rental income statements, and records of any foreign income.
- Expense records — receipts or a categorised spreadsheet. If you use accounting software, export the year-end summary. If you don’t, list expenses by category (office, travel, equipment, etc.).
- Pension contribution records — especially if you’re a higher-rate taxpayer claiming relief at source. Your pension provider can confirm gross contributions.
- Any P11D forms — benefits in kind from an employer, if applicable.
- Details of any capital gains — asset sales, dates, costs, and proceeds.
If you’re using an accountant or online service, having this organised in advance can reduce their time — and your fee — by 30–50%. If you’re calling HMRC, it means you get your answer in one call instead of three. If you’re filing yourself, it means the return takes an hour instead of an afternoon spent hunting for a P60.
5. Should You Hire an Accountant?
If your return has any real complexity — multiple income streams, a limited company, capital allowances, or you’re behind on multiple years — an accountant is the most thorough option. They don’t just file; they check whether you’re using the right methods, identify reliefs you might miss, and can represent you with HMRC if you’re selected for a compliance check. The cost is £150–£500 for a one-off sole trader return, or £50–£250/month for ongoing service.
The decision comes down to complexity, the value of your time, and your confidence with the rules. If you’d spend more than three hours on your return, or you’re unsure about any expense, relief, or threshold, the accountant typically pays for itself in saved time and avoided mistakes. For the full decision framework — including a 5-question self-test and specific cost breakdowns — read our guide on whether you should hire an accountant for Self Assessment.
If you’ve already decided you want one, skip the reading and find an accountant through our free matching service.
6. Online Tax Return Services: The Middle Ground
If an accountant feels like overkill but DIY feels risky, online tax return services sit in between. You upload your records, a qualified accountant employed by the platform prepares your return, you review it, and the service files it with HMRC. The cost is £100–£300 per return — cheaper than a traditional accountant, more expensive than doing it yourself.
This option suits sole traders with two or more income sources whose returns are too complex to feel comfortable filing alone, but not complex enough to justify a £500+ accountant or ongoing retainer. The trade-off is that you get no ongoing advice — the relationship ends when the return is filed. For a full comparison of the main UK services — TaxScouts, Untied, Crunch, and 1TapTax — including pricing, turnaround times, and who each one suits, see our best Self Assessment tax return services comparison.
7. Software: Help Tracking, Not Help Filing
Accounting software is help with the process, not help with the decisions. Tools like FreeAgent, Xero, and QuickBooks track your income and expenses through the year, connect to your bank via Open Banking, and generate the numbers you need at filing time. But you still make the tax decisions — what’s allowable, which expense method to use, whether to claim a relief — and you file the return yourself.
Software costs £10–£40/month, or nothing if you use a free option like FreeAgent with a qualifying business bank account. It’s the right choice if your return is simple, you’re confident with the rules, and you want digital records that are ready for Making Tax Digital. For choosing a tool, read our cloud accounting guide for sole traders. For the cheapest and free options specifically, see our cheapest MTD software guide. And for the full three-way comparison of software vs online service vs accountant, see our tax return service vs accountant vs software guide.
8. Comparing All Three Options Side by Side
If you’re torn between software, an online service, and an accountant, the comparison comes down to three factors: cost, who does the work, and whether you get ongoing advice.
Software is cheapest (£120–£480/year or free) but you do everything. An online service costs £100–£300 per return and someone files for you, but there’s no ongoing relationship. A traditional accountant costs £150–£500+ or a monthly retainer and provides full service with year-round advice. The cheapest option isn’t always the cheapest in practice — a £150 accountant who finds £2,000 in missed reliefs is cheaper than free software that costs you £2,000 in overpaid tax.
We’ve written a complete side-by-side breakdown — including a comparison table, a 60-second decision guide, and the hybrid option most people ignore (software for tracking + accountant for filing) — in our tax return service vs accountant vs software guide. Read that if you want the full comparison before deciding.
9. If You’ve Missed the Deadline
If you’re reading this after the 31 January deadline has passed, your priorities shift. The penalty clock is already running — £100 immediately, then escalating to £1,600+ at 6 months and 12 months late — and the longer you wait, the worse it gets.
An accountant can file the late return quickly, advise on the penalty you’re facing, and negotiate with HMRC on your behalf, including setting up a Time to Pay arrangement if you owe a large amount. Online tax return services can file late returns but aren’t designed for penalty negotiation or multi-year catch-up work. For the full steps to take — including what penalties to expect and how to minimise them — read our guide on missed Self Assessment deadlines. If you need someone to handle it now, find an accountant and mention you’re filing late.
10. If You’re Just Starting Out
If this is your first Self Assessment — you’ve recently registered as self-employed, or you’ve just crossed the £1,000 trading income threshold — the good news is that your first return is likely the simplest one you’ll ever file.
Your records are probably limited, your expenses are likely covered by the trading allowance, and the return itself is a few sections on HMRC’s free online service. You almost certainly don’t need an accountant yet. What you do need is to understand the process, know which deadlines matter, and set up a system for tracking income and expenses that will scale as your business grows. Our first-year self-employed checklist walks you through all of this step by step.
The one thing worth doing now, even if you don’t need an accountant this year, is setting up accounting software. If your turnover grows past £50,000, you’ll need MTD-compatible software from April 2026 anyway — starting now means your records are clean from day one and the transition is seamless.
11. Cost vs Complexity: The Quick Framework
If you’ve read this far and still aren’t sure which type of help you need, here’s a simple framework that maps your situation to the right option. It comes down to two axes: how complex your return is, and how much the help costs relative to what’s at stake.
Low complexity, low cost at stake → free HMRC help. One income source, trading allowance or basic expenses, turnover under £50,000, up to date. File yourself using HMRC’s free service. Cost: £0. Time: 20–40 minutes.
Low complexity, want digital records → software. Same return, but you want to track income and expenses through the year and be ready for MTD. Use free or cheap accounting software. Cost: £0–£40/month. You still file yourself.
Medium complexity, no ongoing advice needed → online tax return service. Two or more income sources, some reliefs, property income, but no limited company and you’re not behind on multiple years. Use a tax return service. Cost: £100–£300 per return.
High complexity, or need ongoing advice → traditional accountant. Limited company, three or more income streams, foreign income, behind on multiple years, HMRC enquiry, or you want someone to call about tax decisions. Hire an accountant. Cost: £150–£500 one-off, or £50–£250/month.
Urgent / late filing → accountant, immediately. Deadline missed or multiple years outstanding. Penalties are escalating. Find an accountant who handles catch-up work.
The framework is deliberately simple because the decision usually is. People overcomplicate it by researching every option in depth when their situation points clearly to one. If you’re honest about your complexity and what’s at stake, the right column is usually obvious within a minute.
12. The Hybrid Most People Miss
You don’t have to pick just one type of help. The most cost-effective setup for many sole traders is a combination: use accounting software to track income and expenses through the year, then use an online service or accountant at filing time to prepare and submit the return.
Because your records are already organised in the software, the accountant or service spends less time on your return — and their fee is often lower as a result. Many accountants explicitly reduce their fee if you hand them clean software records instead of a shoebox of receipts. You get the year-round record-keeping benefits of software with the error-checking of a professional, at a lower total cost than a full monthly retainer.
This approach also future-proofs you for Making Tax Digital. From April 2026, sole traders with turnover above £50,000 need MTD-compatible software for quarterly updates regardless of whether they have an accountant. Starting with software now means the transition is seamless rather than a last-minute scramble.
13. Questions to Ask Before You Commit
Whichever type of help you’re leaning towards, ask yourself these questions before you commit time or money:
- What’s actually hard about my return? If it’s gathering records, software solves it. If it’s knowing which rules apply, you need a person. If it’s both, the hybrid approach works.
- How much is my time worth? If you bill clients at £40/hour and your return takes five hours, that’s £200 of your time — roughly the same as a simple accountant fee, except the accountant also catches things you’d miss.
- Will I need help again next year? If your situation is stable and simple, a one-off service or DIY filing is fine. If you’re growing, adding income streams, or approaching the MTD threshold, an ongoing relationship with an accountant will save money over time.
- What happens if I get it wrong? For a simple return, the downside of an error is small. For a complex return, the downside — missed reliefs, penalties, HMRC enquiries — can dwarf the cost of help. Match the help to the risk, not just to the fee.
If you’ve worked through these and you’re still unsure, the safest move is to talk to an accountant. A 10-minute conversation about your situation will tell you whether you need them or not — and most won’t charge for an initial chat.
Ready to Get Help?
If you’ve worked through this guide and decided you’d rather have someone handle your Self Assessment — whether that’s because your return is complex, you’re behind, or you simply value your time more than the fee — we can match you with a UK accountant suited to your situation.
Answer a few questions about your business and what you need, and we’ll personally match you with someone who fits. Free, no obligation, and no charge for the matching — you only proceed if you want to.
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