5 Common MTD Mistakes Self-Employed People Make (and How to Avoid Them)

Making Tax Digital (MTD) is designed to make tax easier — but there are a few simple mistakes that can cause stress, errors, and even penalties. The good news? Every one of them is completely avoidable.

If you’re self-employed, you’ve probably seen a lot of mixed messages online about Making Tax Digital for Income Tax. And if you’re like most sole traders we speak to, you’ve probably wondered:

• “What happens if I get something wrong?”
• “What if I pick the wrong software?”
• “Will this make my tax more complicated?”

The reality is this: MTD becomes stressful only when people aren’t prepared or don’t have the right support.

So let’s walk through the five most common MTD mistakes self-employed people make — and how you can avoid them completely.

 

1. Waiting Until the Last Minute to Get Ready

This is the most common MTD misstep.

Many people see April 2026 and think, “I’ve got ages… I’ll sort it later.” But the closer the deadline gets, the harder it becomes to switch systems, learn new tools, and catch up on digital record-keeping.

Starting early isn’t just smart — it’s the biggest stress-saver.

Why it’s a problem:

• Leads to rushed or incomplete setup
• Increases errors
• Creates avoidable pressure
• Leaves no time for support or training

How to avoid it:

Get clarity early.
Even a simple conversation can map out exactly what you need and when. 

Crew Tip:
A 15-minute discovery call now can save you hours of panic later.

Once people realise they need to get ready, their next challenge is choosing the right tools — and that leads straight into the second most common mistake.

2. Using Software That Isn’t MTD-Recognised

One of the easiest mistakes to make is assuming your current setup will work under MTD. But HMRC requires that all MTD submissions be made through officially recognised software.

Old tools, outdated systems, or spreadsheets alone won’t cut it.

Choosing the right software early makes every other part of MTD a breeze.

Why it’s a problem:

• Non-compliant software cannot submit MTD updates
• Leads to rejected submissions
• Risk of penalties
• Forces last-minute changes

How to avoid it:

Use software that is fully HMRC-recognised and ideal for self-employed individuals.

The Crew recommends:

• Xero — powerful and customisable
• FreeAgent — simple, automated, sole-trader friendly

As a Crew client, you’ll also get:

• 20% off Xero
• 50% off FreeAgent

Even when someone picks the right software, old habits often creep in — especially for spreadsheet users. And that’s where the next mistake comes in.

3. Copying and Pasting Between Spreadsheets

This one catches a lot of people out. Under MTD, manual copy/paste is not allowed for anything that forms part of a submission. HMRC requires a digital link — meaning data must flow from source to submission without manual manipulation. This rule exists to reduce errors… but it also means spreadsheets become risky.

Why it’s a problem:

• Breaks compliance rules
• Makes submissions invalid
• Increases the chance of mistakes
• Is difficult to audit 

How to avoid it:

Move to cloud software that:

• Stores all records digitally
• Automates data flow
• Removes the need for manual formulas 

Did You Know?
Businesses using spreadsheets make far more tax reporting errors than those using cloud software.

But even with the right tools in place, MTD introduces a new rhythm to tax reporting — and that’s where many people slip up next.

 

4. Missing Quarterly Deadlines

Self-employed people moving to MTD will need to submit four quarterly updates each year, plus a final declaration. It’s a consistent rhythm — but it’s easy to lose track when you’re busy running your business.

Why it’s a problem:

• Missed updates can lead to penalties
• Creates inaccurate tax forecasts
• Adds unnecessary stress

How to avoid it:

Stay ahead by letting software — or even better, your accountant — track and handle deadlines.

At The Crew, we:

• Track all your update deadlines
• Prepare your submissions
• Keep your digital records accurate
• Ensure nothing is missed

Deadlines handled. Stress removed.

And finally, there’s the mistake that causes the most frustration… the one almost every self-employed person is tempted to make.

 

5. Trying to Handle Everything Yourself

The self-employed mindset is often: “I’ll figure it out. How hard can it be?”

But MTD setup involves:

• Registering with HMRC correctly
• Setting up (or migrating to) new software
• Connecting bank feeds
• Configuring categories
• Capturing digital records
• Understanding quarterly update rules

Doable? Yes.

Worth your time? Most people say no.

Why it’s a problem:

• Eats into your working hours
• Creates confusion and guesswork
• Increases the risk of errors
• Makes tax more stressful than it needs to be

How to avoid it:

You don’t have to tackle MTD alone.

A good accountant handles:

• Full setup
• Software configuration
• HMRC registration
• Ongoing submissions
• Compliance checks
• Year-end support 

Crew Tip:
Let us do the accounting — you focus on running your business.

The good news? All five of these mistakes vanish the moment you get the right guidance and support.

 

How to Avoid All These Mistakes (The Easy Way)

When you work with The Accounting Crew, you don’t just get help —
you get clarity, confidence, and a team that handles the hardest parts for you.

We’ll:

• Set up your MTD software
• Register you with HMRC
• Move your old records across
• Keep your digital bookkeeping tidy
• Submit every quarterly update
• Handle your final declaration

And you’ll get discounted software:

• 20% off Xero
• 50% off FreeAgent

You stay focused on your business.
We’ll take care of the tax.

 

Next Steps: Make MTD Easy and Stress-Free

Making Tax Digital doesn’t have to feel overwhelming. You just need the right plan — and the right team.

Here’s how to get started:

👉 Download our free Making Tax Digital Guide
Packed with simple explanations, timelines, and checklists.

👉 Book a free Discovery Call
We’ll look at your situation, explain your deadlines, and give you clear next steps — 100% no pressure.

No jargon.
No tech headaches.
Just friendly, expert advice.