If you run a consultancy through a limited company, there's a good chance your profits now sit in awkward territory. You're doing well, cash is building, and then a simple question turns into a surprisingly messy one. What corporation tax rate applies now?
That confusion is completely understandable. For years, many directors got used to one headline figure and built their expectations around it. Since the rules changed, the practical question isn't just whether the corporation tax small profits rate exists. It does. The main concern is whether your company receives it in full, gets pulled into marginal relief, or loses access to the lower threshold sooner because of an associated company you hadn't really counted.
If you want a broad refresher on the basics first, this guide on how corporation tax works for UK limited companies is a useful starting point. For most consultants and contractors, though, the biggest danger sits in the middle ground. That's where profits aren't clearly low enough for the small profits rate, but not high enough to make planning irrelevant.
Your Company Profit and the New Tax Landscape
A lot of directors first notice the problem when profit starts edging upwards. One year you're comfortably below the lower band. The next, you've landed just above it and your expected tax bill no longer looks straightforward.
That matters because your planning decisions often happen before year end. If you wait until the accounts are finalised, you've usually lost some of your best options.
Why this feels more complicated now
The current system creates different outcomes depending on where your taxable profit lands. For a successful consultancy, that means the same business can face a very different corporation tax position from one year to the next, even if turnover hasn't changed dramatically.
Small changes in profit can alter your effective corporation tax outcome more than many directors expect.
That's why this topic matters so much for owner-managed companies. If you pay yourself through a mix of salary and dividends, make pension contributions through the company, or time spending on software, equipment, training or subcontractors, your tax result can shift quickly.
What tends to catch directors out
The most common misunderstandings are usually these:
- Thinking the lower rate is a simple pass or fail test: many directors assume they either qualify for the lower rate or they don't.
- Ignoring the messy middle: profits between the two main limits don't fall neatly into one rate.
- Forgetting group structure: if you control more than one company, the thresholds may not be the ones you think they are.
- Leaving planning too late: by the time your accountant drafts the return, the strategic choices may already have gone.
For a contractor or consultant, the practical question isn't “what's the headline rate?”. It's “what profit figure am I likely to end up with, and what can I still do legally before the year closes?”
That's the difference between basic compliance and proper planning.
Understanding the Two Tiers of Corporation Tax
The current framework for most UK limited companies is built around two headline rates and a band in the middle. Since 1 April 2023, the UK moved to a two-rate corporation tax structure for non-ring-fence profits, with a small profits rate of 19% for companies with profits of £50,000 or less, a main rate of 25% for companies with profits above £250,000, and companies between those limits paying the main rate reduced by marginal relief, as set out in the UK corporation tax rates and allowances guidance.
The key thresholds
Small profits rate: 19% if profits are £50,000 or less.
Main rate: 25% if profits are above £250,000.
Middle band: above £50,000 and below £250,000, the company pays the main rate with marginal relief.
If you want a separate rate-focused explainer, this corporation tax rate guide helps frame the wider picture.
What changed in practical terms
This wasn't a minor tweak. It replaced the earlier flat 19% corporation tax rate that had applied from April 2017. So if you've been running your company for several years, your memory of a single rate isn't out of date by accident. It was true for a time.
The practical result is different for different businesses:
| Profit position | Broad outcome |
|---|---|
| At or below the lower limit | The small profits rate applies |
| Between the limits | Marginal relief becomes relevant |
| Above the upper limit | The main rate applies |
For some smaller companies, nothing changed in headline terms because they remained within the lower band. For growing consultancies, the change is more significant because the rate no longer jumps from one simple answer to another. It starts to taper.
Why the simple summaries are misleading
Many online guides stop after mentioning 19% and 25%. That's useful, but incomplete. If your company's profits sit in the middle, the pertinent issue is your effective rate, not the headline labels.
That's where directors often make poor year-end decisions. They think they are still “on 19%” or assume they've already “gone to 25%”, when neither statement is really true in the middle band.
Navigating the Marginal Relief Maze
The corporation tax small profits rate presents a less intuitive scenario. If your company's profits fall between the lower and upper limits, you don't just pick one of the two headline rates and move on.
Many readers search for the small profits rate as if it works like a clean threshold, but companies with profits between £50,000 and £250,000 don't pay a flat 19% or 25%. They pay the main rate reduced by marginal relief, and the effective rate rises gradually across that band, as discussed in this explanation of the marginal relief problem for company owners.
Think of it as a ramp, not a cliff
Most directors expect a cliff edge. They assume that once profit goes above the lower threshold, the whole company suddenly gets taxed at a much higher rate. That isn't how this works.
A better way to think about it is a ramp. As profits rise through the middle band, the relief gradually reduces. That pushes your effective corporation tax rate upwards over time.
If your profits sit in the middle, your tax position is changing gradually, not flipping instantly from one rate to another.
That distinction matters because planning decisions near the year end can still move the dial. If your company is only modestly into the marginal relief band, a legitimate reduction in taxable profit may produce a better result than you expected.
Here's the video version if you prefer a visual explanation.
Why this becomes a trap for contractors
Contractors and consultants often have lumpy profits. One contract finishes late. Another starts sooner than expected. A bonus lands. Deferred spending gets pushed into the next period. Suddenly the company's taxable profit lands in the middle band almost by accident.
That creates a planning trap because the headline small profits rate no longer tells the full story.
Common triggers include:
- Delayed spending: software, equipment or professional costs slip into the next period.
- Late pension decisions: the company could have made contributions earlier but didn't.
- Bonus timing: director pay choices can move taxable profit around.
- Contract timing: income bunches into one accounting period instead of spreading more evenly.
Focus on the effective rate, not the label
When profits enter the middle band, the better question is not “am I on 19% or 25%?”. The better question is “what is my effective rate at this level of profit, and is there anything sensible I still want the company to do before year end?”
That might include reviewing:
- Company pension contributions
- Timing of planned business expenditure
- Capital investment already under consideration
- Whether profit can sensibly be recognised in a different period
- How director remuneration is being handled
Practical rule: once profits move into marginal relief territory, every legitimate deduction starts to carry more strategic weight.
That doesn't mean spending money for the sake of tax. Bad spending is still bad spending. But if you were already planning to make a pension contribution, buy software, replace equipment or invest in the business, the timing becomes more valuable.
Why many directors overpay without realising
The overpayment usually doesn't happen because the return is wrong. It happens because no one made a deliberate year-end decision while there was still time.
That's especially common with successful consultancies. They're busy. The company is profitable. Cash is available. Tax gets treated as an afterthought until the draft accounts arrive, and by then the most useful planning window has already closed.
Worked Examples for Contractors and Consultants
The concept becomes much clearer when you see how the middle band behaves in practice. Below are two simple examples based on common contractor situations.
These examples are illustrative and use the current rate structure described earlier. Your actual result can differ if there are associated companies, short accounting periods, or other complications.
Example one with profit at £60,000
A consultant finishes the year with £60,000 of taxable profit. That puts the company above the lower threshold, but nowhere near the upper one.
The first step is to stop thinking in binary terms. This company isn't fully within the small profits rate, and it isn't fully at the main rate in practical effect either. It sits on the ramp.
What does that mean in plain language?
- The company falls into the marginal relief band.
- The 19% small profits rate no longer applies as a simple whole-company answer.
- The 25% main rate is reduced by marginal relief.
- The effective rate is higher than the lower rate, but lower than the main rate.
That's why a company at £60,000 profit often deserves attention. It's close enough to the lower threshold that a commercially sensible adjustment may change the overall tax outcome.
What a director might do at this level
Suppose the company was already considering a pension contribution before the year end. Or perhaps it needed software licences, a laptop replacement, or another genuine business cost that had not yet been paid.
At this level of profit, those decisions may do more than just reduce taxable profit in the usual way. They may also move the company further down the marginal relief ramp. That can improve the effective rate applying to the profit left in the company.
A company only slightly above the lower threshold is often where timing matters most.
The key point isn't to chase tax savings blindly. It's to compare commercial choices while you still have options. If you planned to spend anyway, paying earlier rather than later may produce a better corporation tax result.
Example two with profit at £150,000
Now take an IT contractor with £150,000 of taxable profit. This company is much deeper into the marginal relief zone.
The planning logic changes here. The company is still in the middle band, so marginal relief still applies, but the effective rate is now much closer to the main rate than it was in the earlier example.
That means two things are usually true:
- year-end planning still matters
- the company is less likely to recover the lower-rate feel of the first example
How the practical choices differ
At £150,000 profit, directors often ask whether they should rush out and spend money to “save tax”. Usually that's the wrong mindset.
A better approach is to ask:
| Question | Why it matters |
|---|---|
| Was the spending already needed? | Tax should support a business decision, not create a poor one |
| Does a company pension contribution fit your wider extraction plan? | Pension planning can reduce profit while helping long-term wealth building |
| Would moving costs into this period actually reflect commercial reality? | Artificial timing creates risk |
| Are you near any other planning pressure points? | Salary, dividends and retained profits all interact with broader strategy |
At this profit level, the numbers can still move, but the aim is optimisation, not rescue. You're unlikely to transform the position completely. You're trying to make measured, lawful decisions that improve the company's tax efficiency without harming cash flow or business priorities.
The lesson from both examples
The first example shows why directors near the lower threshold shouldn't assume the damage is done once profit creeps over it. The second shows why the middle band still needs active management even when profits are comfortably above the lower limit.
The broad pattern is simple:
- Closer to the lower threshold: planning can have sharper impact.
- Further into the middle band: planning still helps, but usually with less dramatic effect.
- No planning before year end: you're mostly left explaining the bill afterwards.
For contractors, that's the heart of the marginal relief trap. The tax position changes gradually, but many directors still make decisions as if the rate only changes in big jumps.
The Associated Companies Complication
A lot of directors finally get comfortable with the thresholds, then run into the next problem. The thresholds may not belong to one company alone.
For companies with associated companies, both the £50,000 lower limit and £250,000 upper limit are divided by the number of active associated companies worldwide, which can materially reduce access to the 19% small profits rate, as explained in ACCA's guide to associated companies and small profits corporation tax rules.
What associated companies means in practice
In simple terms, companies can be associated where one controls the other, or both are under common control. For many owner-managed businesses, that means this issue can arise where the same person or group of people effectively controls more than one company.
That's why consultants and contractors get caught out. You may think of each company separately because each one has its own bank account, its own clients and its own accounts. HMRC's view of control may not follow that commercial mental shortcut.
Why this changes the tax result so quickly
The practical effect is straightforward. If there is more than one associated company, the thresholds are split.
A simple illustration helps:
| Structure | Lower limit | Upper limit |
|---|---|---|
| One company | £50,000 | £250,000 |
| One company plus one associated company | £25,000 | £125,000 |
That means a company with what looks like modest profit can be pushed into marginal relief sooner than expected. In some cases, it can approach the main rate sooner as well.
Two companies under common control can change the tax picture even if each one looks small on its own.
Situations that deserve a closer look
This rule often matters where a director has:
- A second trading company: perhaps a side venture or separate consultancy brand
- A company held with a spouse or business partner: control can become less obvious than it first appears
- A group structure: parent and subsidiary arrangements need careful review
- Overseas entities within the wider structure: worldwide associated companies can be relevant
The danger here isn't just paying more tax. It's budgeting on the wrong assumptions all year, then discovering that your thresholds were lower than expected.
If you run more than one company, or have any kind of shared ownership structure, don't assume the standard limits apply automatically. This is one of the first areas worth checking before you make profit extraction decisions.
Strategic Planning and When to Get Help
Once your company is near the lower threshold, in the marginal relief band, or affected by associated company rules, tax planning becomes much more than a compliance exercise. It turns into a timing exercise.
The wider policy background matters here too. The UK's main corporation tax rate fell from 28% in 2010 to a flat 19% in April 2017, before a later policy reversal restored a 25% main rate from April 2023, as noted by the Office for Budget Responsibility's historical review of corporation tax. The point for directors is simple. Tax rules change, and a strategy that made sense a few years ago might not be the best fit now.
What sensible planning usually looks like
For most contractors and consultants, the strongest planning options are the ordinary ones used deliberately:
- Pension contributions through the company: often worth reviewing if you want to reduce taxable profit and build long-term value.
- Bringing forward genuine expenditure: useful where the business already intends to buy software, equipment or services.
- Checking remuneration timing: salary and bonus decisions can affect the company's taxable result.
- Reviewing structure early: especially important if more than one company may be associated.
For more ideas on lawful optimisation, this guide on how to reduce corporation tax in the UK is a practical next read.
When it's worth getting a second opinion
You probably don't need specialist help if profits are comfortably below the lower threshold and your structure is simple. You should think harder about getting support if any of the following apply:
- Profits are hovering around the lower threshold
- You're already in the marginal relief band
- You control more than one company
- You're making larger pension or extraction decisions
- Your accounting period or group structure adds complexity
Good tax planning usually happens before the year end, not after the bill arrives.
That's the key takeaway. The corporation tax small profits rate still matters, but on its own it doesn't tell most successful directors enough. The practical win comes from understanding where your company sits, what pushes it into marginal relief, and which legal decisions still remain available before the year closes.
If you want help making sense of your company's position, Tax Compass gives UK limited company directors, contractors and consultants practical guidance on tax strategy, profit planning and when to bring in specialist advice.