If you’re a sole trader, you’ve probably heard the whispers (or maybe the shouts) about Making Tax Digital (MTD) for a few years now. But as we crawl closer to the April 6th deadline, those whispers are turning into a reality that can’t be ignored.
At Makes Sense Accountants, we’ve been helping business owners navigate these changes since they were first announced. We know that for many, the phrase "Making Tax Digital" sounds like just another hurdle to clear while you're trying to actually run your business. But here’s the thing: it doesn’t have to be a nightmare.
The goal of MTD for Income Tax Self Assessment (ITSA) is to make tax more accurate and easier to manage in real-time. The catch? If you get it wrong, HMRC’s new points-based penalty system is waiting in the wings.
To help you stay on the right side of the taxman, we’ve rounded up the seven most common mistakes sole traders make with MTD, and, more importantly, how you can avoid them before the clock strikes midnight on April 6th.
1. Assuming You’re Not "Big Enough" for MTD
One of the most dangerous mistakes is thinking MTD doesn't apply to you because you're "just" a small operation.
Starting from April 2026, sole traders and landlords with a qualifying income over £50,000 will need to follow MTD rules. By April 2027, that threshold drops to £30,000.
How to avoid the mistake:
Check your gross income (your total sales before expenses) for the 2024/25 tax year. If you’re over that £50k mark, you are in scope. Don't wait for a formal invitation from HMRC; being proactive is the key to a stress-free transition. You can read more about how we support sole traders through this shift on our dedicated service page.
2. Sticking to the "Shoebox" Method (or Even Excel)
We’ve all been there, the shoebox full of crumpled receipts that gets handed over once a year. Under MTD, that method is officially retired. You are now required to keep digital records of all business income and expenses.
While some people love their spreadsheets, simply keeping an Excel file isn't enough unless it is "digitally linked" to HMRC-approved software. Manual data entry from a spreadsheet into an HMRC portal is a big no-no.
How to avoid the mistake:
Each transaction must record three specific pieces of information:
- The date.
- The amount.
- The category (e.g., travel, office supplies, cost of goods).
The easiest way to do this is to use Making Tax Digital software that connects directly to your bank account.
3. Treating the Deadline Like an "Annual Event"
The biggest culture shock for sole traders is the frequency of reporting. For years, you’ve dealt with tax once a year in January. MTD changes the game to a quarterly system.
You’ll be required to send four "quarterly updates" to HMRC throughout the year, plus a "Final Declaration" at the end. This means you have five deadlines to hit instead of one.
How to avoid the mistake:
Mark your calendar now. Missing a quarterly update isn’t just an inconvenience: it now triggers HMRC’s new penalty point system. Think of it like a driving licence: get too many points for late submissions, and you’ll be hit with an automatic £200 fine.
4. Forgetting to Combine Your Income Streams
This is a subtle one that catches a lot of people out. HMRC looks at your total qualifying income.
If you earn £30,000 from your consultancy business and £25,000 from a rental property, your total qualifying income is £55,000. Even though neither individual "business" is over the £50,000 threshold, your combined total puts you firmly inside the MTD requirements for 2026.
How to avoid the mistake:
Add up all your sources of self-employed and property income. If the total exceeds the threshold, you need to be digital for all of them. If you're unsure how to aggregate your income, contact us for a quick chat.
5. Messy Transaction Categorisation
Under the old system, you might have lumped a bunch of costs into "General Expenses" at the end of the year. Under MTD, HMRC expects a bit more precision in real-time.
A common mistake is mislabelling transactions or failing to separate personal spending from business spending in your digital records. If HMRC sees constant corrections or "miscellaneous" buckets, it could trigger a tax investigation.
How to avoid the mistake:
Open a dedicated business bank account if you haven't already. Most modern accounting software will pull your bank feed in automatically. Spend five minutes a week "matching" those transactions to categories. It's much easier than doing three months' worth of work the night before a quarterly deadline.
6. Ignoring "Digital Links"
HMRC is very strict about the "digital journey" of your data. This means that once a piece of data is in your digital system, it should stay digital.
The mistake here is "cutting and pasting" data from one place to another. HMRC considers a manual cut-and-paste to be a break in the digital link. If you’re taking data from a sales app and manually typing it into your tax software, you’re technically not compliant.
How to avoid the mistake:
Ensure your software tools "talk" to each other. Most modern apps use APIs to share data automatically. If you’re using multiple systems, check that they are compatible. At Makes Sense Accountants, we specialise in helping businesses set up these digital links so you don't have to worry about manual errors.
7. Waiting Until April 5th to Get Started
The "I'll do it tomorrow" approach is the most common mistake of all. Setting up software, linking your bank accounts, and learning a new way of working takes time. If you wait until the April 6th deadline to start, you’re likely to miss your first quarterly update, leading to: you guessed it: penalty points.
How to avoid the mistake:
Start now. Even if you aren't required to report until next year, getting your digital record-keeping in order today will save you hours of stress later. It also gives you a real-time view of your profit, which is actually a pretty great way to run a business!
Understanding the New Penalty Points System
HMRC has moved away from the "all or nothing" fine approach and toward a points-based system for MTD. It works like this:
- 1 Point per Miss: For every late quarterly update or final declaration, you receive one penalty point.
- The Threshold: Once you hit a certain number of points (usually 4 for quarterly filers), you are issued a £200 fine.
- Every Miss After: Once you're at the threshold, every subsequent late submission triggers another £200 fine.
- Expiration: Points eventually expire, but only if you have a period of perfect compliance and have submitted all outstanding returns.
It’s a system designed to encourage consistent, on-time digital reporting. You can find more details on staying compliant on our blog.
How Makes Sense Accountants Can Help
We get it: you didn't start your business because you loved the idea of "quarterly digital updates." You started it because you're great at what you do.
At Makes Sense Accountants, our job is to make the "boring stuff" easy. We don't just tell you what the rules are; we help you implement them. From choosing the right HMRC-approved software to managing your quarterly submissions and ensuring your digital links are unbroken, we take the weight off your shoulders.
Transitioning to MTD is a big step, but with a proactive approach and a friendly team behind you, it’s one you can take with confidence.
Ready to get MTD-ready?
Don't wait for the points to start piling up. Get in touch with us today for a friendly chat about how we can manage your transition to Making Tax Digital without the stress.
Ready to make your accounting make sense?
Still got questions? Let’s chat. Fill in our contact form and we’ll point you in the right direction: https://www.msaccounts.co.uk/contact/