- Xero records and organises your finances, but it doesn’t decide the correct tax treatment or take responsibility for what’s filed.
- You can legally run Xero without an accountant, and a simple single-director company with no payroll and no VAT often can.
- Statutory accounts still go to Companies House and a CT600 still goes to HMRC, and neither is produced automatically by Xero.
If you already use Xero, you probably don’t need an accountant just to keep your books, but you likely still need one for the parts Xero can’t do: deciding the correct tax treatment, preparing and filing statutory accounts, and answering to HMRC if a return is queried.
Xero is genuinely good at recording and organising. It doesn’t decide, review, or take responsibility for what gets filed. That’s the line this guide draws.
Sleek’s accounting that works in your Xero is built around that gap, not around replacing the software you already pay for.
Does Xero replace an accountant?
Xero replaces a lot of the manual bookkeeping an accountant used to charge you for, but it doesn’t replace the judgement, the statutory filings, or the accountability. The software is a recording tool. An accountant is the person who decides what the records should say and stands behind it.
Think of it this way. Xero tells you what happened to your money. An accountant tells you whether you’ve treated it correctly, what you owe, and what to do next.
That distinction matters most for the reader who’s already bought the software and assumes the job’s done. It isn’t, but not for the reasons you might expect.
What Xero does well
Xero handles the day-to-day recording of your finances better than a spreadsheet ever could, and Sleek works inside it precisely because it’s good. Here’s where it earns its subscription.
- Bank feeds: transactions flow in automatically, so you’re not typing them out.
- Invoicing: raise, send, and chase invoices from one place.
- Categorisation: costs get sorted into the right buckets, based on rules you set.
- VAT return preparation: it pulls the figures together ready for submission.
- Digital records: it keeps Making Tax Digital for VAT records in the right format.
- Receipt capture: photograph a receipt and it’s attached to the transaction.
If you want to get more out of these features, our guide on how to get the most from Xero walks through the setup properly.
None of this is in question. The problem starts where recording stops and deciding begins.
What Xero doesn’t do
Xero doesn’t make judgement calls, prepare your statutory filings, or carry the responsibility if something’s wrong. These are the tasks that sit outside the software, whatever your subscription tier.
- Decide the correct treatment of an unusual or one-off cost.
- Prepare statutory accounts for Companies House.
- Complete and file a CT600 correctly with HMRC.
- Spot that you crossed the VAT threshold two months ago and should already be registered.
- Advise whether to take money as salary or dividends.
- Answer for the return if HMRC opens a query.
That last point is the one people underestimate. Software can produce a number. It can’t defend it.
For a wider view of how software and human support fit together, our Xero, QuickBooks and SleekBooks compared guide sets out the tooling side.
Tidy books, wrong numbers: the categorisation problem
Xero categorises transactions based on rules someone has to set up and keep maintained, which means it will happily produce numbers that look tidy, confident, and wrong. The software isn’t checking whether the rule is right. It’s just applying it.
Say you’ve told Xero to code every payment to a particular supplier as a straightforward expense. If some of those payments were actually capital purchases, or included a personal element, Xero won’t flag it. The report looks clean. The treatment is wrong.
Why “clean” isn’t the same as “correct”
A tidy set of books gives false comfort. The reconciliation ticks along, the dashboard looks healthy, and nothing warns you that a rule has been quietly misfiring for six months.
An accountant reviewing the file catches the pattern a rule can’t. That’s the difference between data entry and judgement, and it’s the main reason bookkeeping support pays for itself on a busier company.
Review your Xero bank rules once a quarter. Rules set up in year one often no longer match how the business actually spends by year three.
The gap between your Xero file and filed accounts
Your Xero file is a set of records, not a filed set of accounts, and closing that gap is the year-end work that sits outside the software entirely. This is where “I use Xero” and “my filings are done” stop meaning the same thing.
At year end, two separate things have to happen, and Xero does neither on its own.
What’s needed | Where it goes | Deadline |
Statutory accounts | Companies House | Normally 9 months after your year end |
CT600, statutory accounts and tax computation, in iXBRL | HMRC | 12 months after the accounting period |
Both the accounts and the computation have to be filed in iXBRL, a machine-readable format HMRC requires, and the CT600 reconciles your accounting profit to your taxable profit, which are rarely the same figure.
One more current detail worth knowing: HMRC’s free Corporation Tax filing service closed on 31 March 2026. Companies now file through commercial software or an agent, which is a practical reason many Xero users bring in a person at year end. If you want the mechanics, see our guide to corporation tax filing and payment.
Can you run Xero without an accountant? Sometimes, yes
Some businesses genuinely can run Xero alone, and it’s only honest to say so. If your situation is simple enough, paying for a full accounting service on top of the software may be more than you need right now.
You’ve a reasonable case for going it alone if all of these are true:
- You’re a single-director company with no other staff.
- You run no payroll.
- You’re not VAT registered.
- Your costs are straightforward, with no unusual or one-off items.
- You’re confident reading your own numbers and meeting deadlines.
Tick all five and Xero, plus some careful reading of HMRC and Companies House guidance, may well be enough. You can register and file plenty of this yourself for free through the official services.
The moment any of those change, though, the calculation shifts. Take on staff, cross the point where you have to register for VAT, or hit a year with anything unusual in it, and the value of a person reviewing the file climbs quickly.
What an accountant adds when you’re already on Xero
An accountant working inside your existing Xero adds the judgement, the filings, and the accountability the software was never built to provide, without duplicating the recording it already does well. You’re not paying twice for the same job.
Here’s the practical split of who does what.
Task | Xero | Accountant in your Xero |
Record transactions | Yes | Reviews, doesn’t re-enter |
Set and maintain coding rules | You set them | Checks and corrects them |
Decide tax treatment | No | Yes |
Prepare statutory accounts | No | Yes |
File CT600 in iXBRL | No | Yes |
Answer HMRC queries | No | Yes |
The point is that a good accountant doesn’t rip you out of Xero and start again. They work in the file you already have, review what the software produced, and take the year-end and filing work off your plate. If you’re weighing this up more broadly, bookkeeper vs accountant explains where each role fits.
How Sleek works inside your Xero
Sleek works in your existing Xero file rather than migrating you onto something new, so there’s no starting again, and a qualified accountant reviews what the software produced. Your Xero data stays yours throughout. We work in it; we don’t take it over.
Our accountants are qualified and in-house, not outsourced, which matters when a filing has your company’s name on it. The software does the heavy recording, a real person checks and files, and you keep the tool you already know.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
450,000
businesses worldwide.
satisfaction rate from
16,000 surveyed clients.
FAQs on using Xero without an accountant
Does Xero file my accounts with Companies House?
No. Xero helps you prepare and keep your records, but it doesn’t automatically file statutory accounts with Companies House. Those accounts are normally due nine months after your year end, and they have to be prepared to the right standard and submitted separately. Most companies use an accountant or filing software to do this.
Can Xero do my corporation tax return?
No, not on its own. Your CT600, statutory accounts and tax computation all go to HMRC in iXBRL format, and the return reconciles your accounting profit to your taxable profit, which Xero doesn’t calculate for you. HMRC’s free filing service closed on 31 March 2026, so you’ll need commercial software or an accountant to file it.
Can I keep my own Xero subscription if I use an accountant?
Yes. A good accountant works inside the Xero file you already have rather than moving you onto a different system. There’s no migration and no starting again. Your data stays yours, the accountant is given access to review and file, and you carry on using the software day to day exactly as before.
Does Xero handle Making Tax Digital?
Partly. Xero is Making Tax Digital compatible software, so it keeps the digital records and prepares VAT returns in the format HMRC requires. Making Tax Digital for VAT is mandatory for all VAT-registered businesses. Xero meets the record-keeping and submission requirement, but it won’t tell you whether you should be VAT registered in the first place.
Will my accountant need access to my Xero?
Yes. To review your figures, prepare your accounts and file your returns, an accountant needs access to the Xero file where your records live. You grant that access from inside Xero and can control the permission level. Working in your live file is what lets them check the software’s output rather than rebuilding it from scratch.
View more
What’s the difference between Xero and SleekBooks?
Both are accounting software, but they’re different products. Xero is a widely used cloud platform, and Sleek works inside it for clients who already use it. The key point for this question is that either way, software records your numbers; it’s the accountant reviewing and filing that turns those records into completed, submitted accounts.
Do I need an accountant if I use Xero as a sole trader?
Not always. A sole trader with simple income and costs can often manage Xero and file a self assessment return alone. It gets harder if you’re near the VAT threshold, have irregular income, or aren’t confident with tax rules. At that point a person reviewing the file usually saves more than they cost in avoided errors and missed reliefs.
