The penalty for missing Making Tax Digital submission deadlines is £200, charged once you accumulate four penalty points, and then £200 again for every further deadline you miss. That number, rather than the £50,000 threshold everyone quotes, is the one that should drive the decision about whether a contractor needs an accountant for Making Tax Digital. This guide sets out who actually faces that exposure, what changes for a limited company contractor who already has an accountant, and where the honest line sits between software alone and paid help.
The short version is that the question is much narrower than it sounds. A PSC contractor drawing salary and dividends is generally outside MTD for Income Tax altogether, so for them the answer is that nothing changes. The decision is real for sole-trader contractors, and for PSC contractors carrying sole-trade or rental income on the side.
The penalty regime a contractor is actually signing up to
Start with the consequences, because they set the price of getting it wrong. MTD for Income Tax uses a points-based late submission penalty. Each missed submission deadline earns one penalty point. The threshold is four points, at which HMRC charges a £200 penalty, followed by a further £200 each time another deadline is missed. If you stay below the threshold, each point is removed automatically 24 months after the missed deadline, so the system targets repeated lateness rather than a single slip.
Two details change the calculation materially, and neither is widely understood.
First, HMRC is not charging penalties for missed quarterly update deadlines in the 2026/27 tax year. The first mandated year is effectively a soft landing on the quarterly submissions. That makes 2026/27 the cheapest possible window in which to find out whether you can run MTD yourself.
Second, late payment penalties are entirely separate and are not softened at all. For 2026/27 they run at 3% of the tax owed at day 15, a further 3% of what is still owed at day 30, and then interest at an annual rate of 10% on the outstanding amount from day 31. For 2027/28 the two fixed charges rise to 4% and 4%. Payment discipline, not submission discipline, is where the money is lost.
First question: is a contractor in scope at all?
Most contractors who ask this question do not need to answer it, because they are not in the regime. MTD for Income Tax applies to sole traders and landlords within Self Assessment, tested on qualifying income, which is gross self-employment income plus gross property income, measured before expenses. Salary, dividends, employment income and savings income are all excluded.
The consequence is clean. A contractor operating through a personal service company extracts money as salary and dividends, neither of which is qualifying income, and the company files a Corporation Tax return rather than a Self Assessment one. The full scope analysis, including the threshold timeline of £50,000 from 6 April 2026, £30,000 from 6 April 2027 and £20,000 from 6 April 2028, is set out in our guide to MTD for Income Tax for contractors. If you have confirmed you are in scope and want the mechanics of getting registered, our walkthrough on how to sign up for Making Tax Digital covers the registration steps and agent authorisation.
Settle the scope question before the accountant question. They are answered in that order, and the first one disposes of most contractors.
What changes for a limited company contractor who already has an accountant
For a PSC contractor with no sole-trade or property income, the honest answer is: nothing. Your existing engagement covers annual accounts, the Corporation Tax return, payroll for the director's salary, dividend administration and your personal Self Assessment. None of those obligations is altered by MTD for Income Tax, because MTD for Income Tax does not reach company profits.
That has a practical consequence worth acting on. If your accountant has proposed a fee increase specifically attributed to MTD, and your only income is a director's salary and dividends from your own company, ask directly which income source they treat as qualifying income. There should not be one. The wider picture of how a PSC director is taxed, and what an engagement should genuinely cover, is set out in our guide to PSC and limited company contractor tax.
Where a PSC contractor does have a live MTD question is the mixed case: a company for the main contracting work, plus freelance income in your own name or a let property. The side income stands on its own and is tested against the threshold by itself. That is the situation where an accountant is doing genuinely more work, because three reporting streams now run in parallel.
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The sole-trader contractor: software only, or an accountant?
This is where the question is real. A sole-trader or freelance contractor over the threshold must keep digital records, file four quarterly updates and submit a final declaration. All three can lawfully be done without an accountant, using MTD-compatible software and an HMRC online account.
The variables that actually decide it are transaction volume, expense complexity and how much of the judgement work you want to own.
| Your situation | Software only | Accountant |
|---|---|---|
| PSC contractor, salary and dividends only | Not applicable, you are outside MTD | No change to existing engagement |
| Sole trader, few clients, minimal expenses, one bank account | Usually sufficient | Optional, best value on the final declaration only |
| Sole trader, high transaction volume or significant equipment spend | Handles filing, not the analysis | Worth it for capital allowances and basis decisions |
| Sole trader plus property income | Two separate businesses to report | Recommended, coordination cost is real |
| PSC plus sole-trade or rental income over threshold | Not realistic on its own | Recommended, three reporting streams in parallel |
| Any contractor with an unresolved structure question | Files an accurate return of the wrong analysis | Advice needed before software choice |
The pattern in that table is consistent. Software reliably solves the execution problem. It does not solve the judgement problem, and the judgement problem is where money is won and lost.
Sizing the quarterly workload honestly for a contractor
The quarterly update is smaller than most contractors fear and the bookkeeping behind it is larger. The standard quarterly periods and their submission deadlines are fixed:
| Quarterly period | Update deadline |
|---|---|
| 6 April to 5 July | 7 August |
| 6 July to 5 October | 7 November |
| 6 October to 5 January | 7 February |
| 6 January to 5 April | 7 May |
The final declaration then follows after the tax year end and remains due by 31 January, alongside the unchanged Self Assessment payment dates of 31 January and 31 July. MTD changes how you report, not when you pay.
For a sole-trader contractor with a dedicated business bank account feeding into cloud software, the submission itself is realistically a fifteen to thirty minute task per quarter: reconcile the feed, categorise the handful of items the software could not, sanity check the totals, submit. Four of those is two hours a year. That is not a compelling reason to hire anyone.
The real workload is the bookkeeping discipline underneath. A contractor who records transactions as they happen finds the quarterly rhythm almost invisible. A contractor who historically reconstructed the year each January now has to do that reconstruction four times, which is where the regime genuinely bites. Be honest about which of those two you are, because that answer predicts the outcome better than income level does.
What a contractor accountant does that software cannot
Software satisfies the digital record-keeping requirement and files compliant submissions. The following are outside its scope, and each of them has a cash value.
- Allowability judgements. Whether a cost is wholly and exclusively for the trade, how to treat mixed-use items, and where the home office and travel boundaries sit. Our contractor expenses guide covers the recurring ones.
- Cash basis versus accruals. A decision made at the final declaration stage, not in the quarterly summaries, with real consequences for timing.
- Capital allowances. Equipment purchases are not simply expenses, and the quarterly updates are deliberately light-touch summaries that do not settle this.
- Cross-income coordination. Where a PSC, a sole trade and property income run together, someone has to make the whole picture consistent.
- Structure advice. Whether you should be a sole trader at all is a bigger question than MTD, and MTD should never be the reason to answer it either way.
If none of those five applies to you, the case for paying someone to press submit four times a year is weak. If two or more apply, the fee is buying analysis rather than administration, and that is a different purchase. Our guide to choosing a contractor accountant sets out how to test whether a firm actually covers that analysis, and the contractor Self Assessment guide covers the deadlines and payment mechanics that sit alongside MTD.
A decision framework for contractors
Work through these in order rather than starting with the fee comparison.
- Confirm scope. Add gross sole-trade fees and gross rents for the tested prior year. If the total is under the threshold, or if all your income is company salary and dividends, stop here. There is no MTD decision to make.
- Count your transactions. Under roughly a hundred business transactions a year with a separate business bank account, software will carry the quarterly load comfortably.
- Test the five judgement areas above. Two or more hits moves the answer towards an accountant, regardless of transaction volume.
- Consider the split engagement. Quarterly updates in-house, final declaration reviewed professionally, is a legitimate and underused middle option.
- Use 2026/27 as the trial year. With no penalties for missed quarterly update deadlines in the first year, the cost of discovering you cannot keep up is unusually low. Do not extend that reasoning to payment deadlines, where the 3% and 10% charges apply in full.
One caution on step five. The trial only works if the digital records exist from the start of the mandated period. A contractor who decides in month five that they want help is handing an accountant a reconstruction job, which costs more than the filing job would have.
So the answer to the question depends almost entirely on one structural fact. If you contract through a limited company on salary and dividends, you are generally outside MTD for Income Tax and nothing about your accountant engagement needs to change. If you are a sole-trader contractor over the threshold, MTD-compatible software genuinely is enough for a simple trade, and the accountant case rests on judgement work rather than on the submissions themselves. If you have income running through both routes, the coordination is where professional help pays for itself. If you would like that mapped to your own position before your first mandated quarter, our contractor accountancy services cover structure, reporting and ongoing compliance, and you are welcome to get in touch.