Sole Trader Tax Guide 2026/27

This year, HMRC expects more than 860,000 sole traders and landlords across the UK to make the single biggest change to how they handle tax in a generation, swapping the familiar annual Self Assessment return for quarterly digital reporting. If that sentence made your stomach drop slightly, you're not alone. We've had more calls about this single change in recent months than almost any other tax topic in years.

We're a two-partner practice based in Folkestone, working with sole traders, contractors, and small business owners across Dover, Canterbury, Ashford, Deal, and the wider Kent area. Every year, we sit down with clients and walk through exactly what's changed, what hasn't, and what actually needs their attention. This guide is that conversation, written down properly, for the 2026/27 tax year specifically.

We're going to cover the actual numbers you need to know, how Income Tax and National Insurance genuinely work for sole traders this year, the big Making Tax Digital change that's now live, and the deadlines and mistakes that catch people out most often. No jargon where we can help it, and real figures throughout, not vague ranges.

The Key Numbers for 2026/27, at a Glance

Let's start with the figures themselves, because everything else in this guide builds on them.

The Personal Allowance, the amount you can earn before paying any Income Tax, is £12,570, frozen at this level since April 2022 and set to remain there until at least April 2031. Above that, the **basic rate** of 20% applies to income up to £50,270. The **higher rate** of 40% applies to income between £50,270 and £125,140. The **additional rate** of 45% applies above £125,140. If your income exceeds £100,000, your Personal Allowance itself starts tapering away, reducing by £1 for every £2 earned over that threshold, disappearing entirely once you reach £125,140.

For National Insurance, Class 4 contributions are charged at 6% on profits between £12,570 and £50,270, and 2% on anything above that. Class 2 contributions, once a compulsory flat weekly charge, are no longer mandatory. If your profits sit at or above the Small Profits Threshold of £7,105, you're automatically credited with a qualifying year for your State Pension record without needing to pay anything. Below that threshold, you can choose to pay voluntary Class 2 contributions at £3.65 a week to protect your State Pension entitlement.

The trading allowance remains at £1,000, letting anyone with small, casual trading income avoid the need to register for Self Assessment at all if that income stays under the threshold. And the VAT registration threshold, for anyone whose turnover crosses it, remains at £90,000.

Registering as Self-Employed: The Deadline People Forget

If you've started trading for the first time during the 2026/27 tax year, you need to register with HMRC by 5 October following the end of that tax year, so by 5 October 2027 for income earned this year. It sounds like a generous window, and it is, but we see people miss it more often than you'd expect, simply because starting a business is busy, and registering with HMRC understandably doesn't feel urgent in the first few months.

A landscape gardener client of ours near Ashford started trading properly in the summer, picking up work steadily through word of mouth. He didn't register until the following spring, well within the deadline, but he told us honestly that he'd simply forgotten it was a requirement at all until a friend mentioned it. Missing this deadline entirely can result in a penalty based on how much tax you owed and how late the registration was, so it's worth marking it properly rather than assuming it'll happen naturally.

How Income Tax Actually Works for a Sole Trader

Here's a genuinely useful worked example, because abstract percentages rarely mean much until you see them applied.

Say you're a self-employed electrician working across Folkestone and Hythe, and your profit for the 2026/27 tax year, that's your income minus allowable business expenses, comes to £45,000. Your first £12,570 is entirely tax-free, thanks to your Personal Allowance. The remaining £32,430 falls within the basic rate band and is taxed at 20%, giving an Income Tax bill of £6,486.

On top of that, Class 4 National Insurance applies: 6% on the portion of your profit between £12,570 and £45,000, which comes to £1,945.80. Add those together, and your total Income Tax and National Insurance liability for the year comes to £8,431.80, against a profit of £45,000. That's a genuinely useful figure to hold in your head when you're setting aside money throughout the year, roughly 19% of your total profit, though the exact proportion shifts as your profit level changes.

If that same electrician's profit grew to £60,000, the calculation shifts. £12,570 remains tax-free. The next £37,700, taking you to the £50,270 higher rate threshold, is taxed at 20%. The remaining £9,730 is taxed at 40%. For National Insurance, the same £37,700 slice is charged at 6%, and the £9,730 above the upper threshold at 2%. It's a genuinely useful exercise to run your own numbers through this structure, because it shows exactly where the next pound of profit gets taxed more heavily, and it's precisely this kind of calculation that informs decisions like pension contribution timing, which we'll come back to.

The Trading Allowance: Useful for Smaller or Side Income

If you have a small amount of self-employment income, alongside a main job or otherwise, the £1,000 trading allowance might mean you don't need to register for Self Assessment at all. If your gross trading income for the year is £1,000 or less, it's entirely tax-free and doesn't need declaring.

If your income is above £1,000, you have a choice: deduct your actual allowable expenses from your income in the normal way, or simply deduct the flat £1,000 allowance instead, whichever works out better for you. This tends to suit people with genuinely minimal expenses, someone doing occasional freelance design work with almost no costs involved, for example, more than it suits a tradesperson with substantial material and equipment costs, where actual expenses will almost always exceed £1,000 and produce a lower tax bill.

Payments on Account: The Bill That Catches First-Timers Off Guard

This is, without question, one of the most common sources of genuine shock we see among newer sole traders, so it deserves proper attention.

If your Self Assessment tax bill for the year exceeds £1,000, and less than 80% of your tax is already collected at source, HMRC requires you to make Payments on Account: advance payments toward your next year's tax bill, split into two instalments, due 31 January and 31 July. Each payment is typically 50% of your previous year's total tax and Class 4 National Insurance bill.

Here's where it catches people out. In your first year of doing this, your January payment includes your actual tax bill for the year just finished, plus your first Payment on Account toward the following year, effectively one and a half years of tax due at once. A hairdresser client of ours in Hythe described her first January bill under this system as "genuinely frightening" until we walked her through exactly why the number looked so much larger than she expected. Once she understood the mechanism, and we helped her set aside money monthly in anticipation of it, the following year's bill felt entirely manageable.

If your circumstances change and you expect your profit to be notably lower than the previous year, you can apply to reduce your Payments on Account rather than overpaying and waiting for a refund. This is worth raising with your accountant proactively rather than discovering after the payment's already been made.

Key Deadlines for the 2026/27 Tax Year

Worth having these clearly in one place. The tax year itself runs from 6 April 2026 to 5 April 2027. If you're newly self-employed during this period, you must register with HMRC by 5 October 2027. Paper Self Assessment returns for this tax year are due by 31 October 2027, while online returns have until 31 January 2028. Any tax owed for the year is also due by 31 January 2028, alongside your first Payment on Account if applicable, with the second instalment due by 31 July 2028.

We always start deadline conversations with clients well before any of these dates approach, precisely because the businesses that struggle most with January are almost always the ones who left everything until the final weeks.

The Big Change This Year: Making Tax Digital for Income Tax

This is genuinely the headline story of the 2026/27 tax year for many sole traders, so it deserves proper explanation rather than a passing mention.

From 6 April 2026, Making Tax Digital for Income Tax became mandatory for sole traders and landlords with qualifying income, that's gross income from self-employment and property combined, above £50,000. If this applies to you, the traditional single annual Self Assessment return is no longer an option. Instead, you're required to keep digital records using compatible software and submit four "light-touch" quarterly updates to HMRC throughout the year, followed by a final year-end declaration.

This threshold is set to drop further: to £30,000 from April 2027, and to £20,000 from April 2028, meaning a large proportion of sole traders across Kent will eventually be brought into this system, even if it doesn't apply to you yet.

A contractor client of ours near Maidstone, whose income crossed £50,000 last year, was understandably anxious when we first explained this change was coming. In practice, once his bookkeeping was properly set up in Xero, the quarterly updates became a fairly light administrative task, closer to confirming figures that were already accurate throughout the year than producing anything new from scratch. The genuine adjustment isn't the quarterly filing itself; it's shifting away from the old habit of reconstructing a year's finances in a rush every January, toward keeping things current as you go. If your income is approaching this threshold, even if you're not over it yet, it's worth starting that shift in habit now rather than waiting until it becomes compulsory.

If your qualifying income is below £50,000 this year, you continue filing exactly as before, a single annual Self Assessment return, with no change required.

Allowable Expenses: A Quick Reminder

We've covered this in more depth in a previous article on what records to give your accountant, but it's worth a brief reminder here in context. Anything wholly and exclusively for business purposes is generally allowable: materials, subcontractor costs, business insurance, professional subscriptions, and a reasonable proportion of costs like your mobile phone or use of home as an office, where the use is genuinely mixed between business and personal.

For very simple expense situations, HMRC also offers flat-rate simplified expenses for things like business mileage and use of home, calculated at set rates rather than working out actual costs. For most sole traders with more substantial genuine costs, calculating actual expenses properly tends to produce a fairer, often larger, deduction, but it's worth discussing which approach suits your specific situation.

Common Mistakes We See Every Year

A few patterns show up reliably enough to be worth flagging directly. Underestimating a first Payments on Account bill, as covered above, catches a genuine number of newer sole traders by surprise every January. Forgetting to register within the deadline after starting to trade is another recurring issue, usually born from simple busyness rather than carelessness. And missing the trading allowance choice, defaulting to claiming actual expenses without checking whether the flat £1,000 allowance would actually produce a better result, is a small but genuinely common oversight, particularly for anyone with modest, low-cost side income.

We'd also flag, specifically for this tax year, business owners approaching the £50,000 Making Tax Digital threshold without realising it applies from the very start of the 2026/27 tax year, not from whenever they happen to notice. If your income has grown meaningfully over the past year, it's worth checking this specifically rather than assuming your previous filing approach still applies unchanged.

What This Means Practically for Your Business

Pulling this together into something actionable: know your Personal Allowance and tax bands, so a rough mental calculation of your likely tax bill is always available to you as the year progresses, rather than a total surprise at filing time. Understand whether Payments on Account will apply to you, and set money aside accordingly throughout the year rather than scrambling in January. Check honestly whether Making Tax Digital applies to you this year, or is likely to soon, and start adjusting your record-keeping habits ahead of time if so. And mark the actual deadlines clearly, registration, filing, and payment, well in advance, rather than treating them as a distant concern until they're suddenly imminent.

How We Help Sole Traders Across Kent Navigate This

As a two-partner practice, we make it a priority to walk every sole trader client through exactly how these figures apply to their specific circumstances, not just file a return once a year without context. We flag Payments on Account before they become a surprise, help clients assess whether Making Tax Digital applies to them now or will soon, and review whether the trading allowance or actual expenses genuinely produces the better outcome for their particular business.

If you're a sole trader across Folkestone, Dover, Canterbury, Ashford, or Deal, and you'd like a proper, specific review of how the 2026/27 rules apply to your business, get in touch with us at Cannon Accountants. We'll walk through your actual numbers, not just the general rules, and make sure nothing catches you off guard this year.

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Frequently Asked Questions

Do I need to register for Making Tax Digital if my income is close to, but under, £50,000?

Not yet, if your qualifying income genuinely stays below the threshold. However, it's worth reviewing your figures partway through the year rather than waiting until year-end, since the requirement applies based on income for the tax year, and crossing the threshold partway through can catch people out if it isn't monitored.

What happens if I miss the 5 October registration deadline after starting to trade?

You can still register, but you may face a penalty based on how much tax was owed and how late the registration was made. It's always better to register as soon as possible once you realise it's been missed, rather than delaying further.

Can I choose to join Making Tax Digital voluntarily, even if I'm under the threshold?

Yes, this is possible, and some sole traders choose to do so ahead of time specifically to get comfortable with the software and quarterly process before it becomes compulsory for them in a future year.

Is Class 2 National Insurance still relevant if it's no longer compulsory?

It can be, particularly if your profits fall below the £7,105 Small Profits Threshold. In that situation, voluntary Class 2 contributions at £3.65 a week are a genuinely low-cost way to protect a qualifying year toward your State Pension, worth considering rather than dismissing simply because it's no longer mandatory.

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Disclaimer:

The content of this blog is for general informational purposes only and should not be considered professional tax advice. The information is correct at the time of publishing but may change following future UK budget announcements or updates to HMRC guidance. Individual circumstances vary, and tax obligations can differ based on your personal situation. We strongly recommend consulting with us or a qualified tax professional to receive advice tailored to your specific needs.