5 tax mistakes high-earning consultants make (and how to avoid them)

If you're a consultant, contractor or specialist earning a strong income, the chances are you're paying more tax than you need to — or you're exposed to risks you don't even know about yet.

After 20+ years in practice, including time at a Big Four firm, I've seen the same mistakes come up again and again. Here are the five most common ones.

1. Operating as a sole trader when you should be a limited company

This is the biggest one. Once you're consistently earning above £50,000–£60,000 a year, a limited company structure almost always saves you significant tax — through a mix of salary and dividends, plus allowable expenses. Yet many consultants stay as sole traders simply because nobody has sat down and run the numbers with them.

2. Not understanding IR35 — or assuming it doesn't apply to them

IR35 is still one of the most misunderstood areas of tax for contractors. Getting it wrong in either direction is costly. If you're working through a limited company but operating like a permanent employee, HMRC will come looking. A proper IR35 review takes an hour and can save you years of stress.

3. Missing out on allowable expenses

Home office costs, professional subscriptions, equipment, training, travel — there's a long list of legitimate expenses that consultants routinely miss because nobody told them they could claim. Over a year, this can add up to thousands in unnecessary tax.

4. No plan for what happens when income fluctuates

Contract work isn't always predictable. A good tax plan isn't just about the current year — it's about smoothing income, managing cashflow, and making sure a quiet quarter doesn't turn into a crisis. Pension contributions, timing of dividends, and retained profits all play a role here.

5. Leaving international options off the table

If you're earning well and working flexibly, the question of where you're based — and how that affects your tax — is worth asking. For some consultants, relocating to or spending time in a place like Dubai changes the picture considerably. This isn't for everyone, but it should be a conversation you've had with your accountant.

The common thread in all of these? They're not complicated problems. They just require someone to look at your situation properly and give you a straight answer.

If any of this sounds familiar, feel free to get in touch or visit charterwells.co.uk to book a free initial consultation.