Do tradespeople need an accountant? It’s one of the most common questions I get, and the honest answer is: it depends on what’s going on in your business, but most tradespeople would be better off with one sooner than they think.

What Tax Obligations Do Self-Employed Tradespeople Actually Have?

If you work for yourself as a tradesperson, sole trader or through a limited company, you’ve got real tax obligations that don’t go away by ignoring them. Most self-employed tradespeople need to register for Self Assessment and file a tax return with HMRC each year. HMRC requires you to notify them by 5 October if you need to complete a Self Assessment for the previous tax year, and missing that deadline can result in a fine before you’ve even filed anything.

Once you’re registered, your Self Assessment tax bill is due by 31 January each year. If your taxable turnover goes above the VAT registration threshold, currently £90,000, you’ll also need to register for VAT and submit quarterly returns on top of that. Getting a handle on these obligations early means you’re not scrambling at the last minute or, worse, finding out you owe HMRC more than you expected.

What Expenses Can Tradespeople Claim to Reduce Their Tax Bill?

This is where most tradespeople I speak to are leaving money behind. If you’re buying tools, materials, safety gear, or a work van, those costs are almost certainly tax-deductible. You can also claim for fuel and mileage on business journeys, your work mobile, trade subscriptions, and a portion of any costs tied to working from a home office or workshop.

The rule HMRC applies is that an expense has to be wholly and exclusively for the purpose of your trade. A van used only for work is straightforward to claim. A van also used for personal trips is split, and you’d only claim the business portion. Keeping basic records of what you spend, and why, is what lets you claim confidently without worrying about questions from HMRC later.

What Is CIS and Does It Apply to You?

CIS stands for the Construction Industry Scheme, and it affects tradespeople who work in construction, whether as a contractor paying subcontractors or as a subcontractor being paid by a main contractor. If you’re a contractor, you’re required to deduct tax from subcontractor payments before they’re paid out and pass that deduction to HMRC each month. It’s worth noting that from 6 April 2026, mainstream contractors must also file nil returns in any month where no subcontractor payments are made, which is a change that caught some people off guard.

If you’re a subcontractor, tax gets deducted from your payments before they reach you. You can then reclaim any overpaid tax through your Self Assessment return at the end of the year, which means many subcontractors are actually due money back. Getting the CIS paperwork right matters, because errors tend to show up as unexpected bills or missed refunds, and neither is a good situation to be in.

When Does It Actually Make Sense to Get an Accountant?

Most tradespeople wait until there’s a problem before they look for help, and by that point there’s usually more to sort out than there needed to be. A good accountant should save you more than they cost, by making sure you’re claiming everything you’re entitled to and not paying more tax than necessary. That’s not a promise of miracles, it’s just what proper advice does.

Not everyone needs full monthly bookkeeping support. Some tradespeople just need their Self Assessment handled once a year and a bit of guidance on how to track their income and expenses simply. I work with tradespeople at every stage, from someone who’s just gone self-employed to contractors managing multiple employees and monthly CIS obligations, so there’s usually an option that fits without over-complicating things.