Self-Employed Tradesman Tax Guide: What You Actually Need to Know

Tax Doesn't Have to Be Scary

Most tradesmen I know would rather rewire a house than deal with tax. But ignoring it costs you money - through overpaying, penalties, or nasty surprises. Here's the no-nonsense guide to tax for self-employed tradesmen.

What You're Actually Paying

Income Tax:

• Personal allowance (tax-free): £12,570
• Basic rate (£12,571-50,270): 20%
• Higher rate (£50,271-125,140): 40%
• Additional rate (over £125,140): 45%

National Insurance (Class 2 and 4):

• Class 2: Small weekly amount (being phased out)
• Class 4: 9% on profits between £12,570-50,270, 2% above that

Rough guide: On £40,000 profit, expect to pay roughly £6,000-7,000 in tax and NI combined.

What You Can Claim (Legitimately)

This is where you save money. If it's a genuine business expense, claim it.

Tools and equipment:

• All power tools for business use
• All hand tools
• Accessories, batteries, blades, bits
• Tool bags, boxes, storage
• PPE and workwear

Vehicle costs (mileage method):

• 45p per mile for first 10,000 miles
• 25p per mile after that
• Keep a mileage log (date, destination, purpose, miles)

Vehicle costs (actual cost method):

• Fuel, insurance, repairs, servicing
• Must separate business vs personal use percentage
• Usually mileage method is simpler

Other claimable expenses:

• Materials and supplies
• Insurance (public liability, tool insurance)
• Accountant fees
• Phone and internet (business portion)
• Training and certifications
• Marketing and advertising
• Trade memberships
• Bank charges on business account

What You Can't Claim

• Food and drink (unless overnight away)
• Clothing (unless it's PPE or branded workwear)
• Fines and penalties
• Personal purchases on the business card
• Your own wages (you're not employed)

Record Keeping That Works

The legal requirement:

• Keep records for at least 5 years
• Must be able to show income and expenses
• HMRC can ask for records at any time

Simple system that works:

1. Business bank account (non-negotiable - keeps personal separate)
2. Folder for receipts (monthly envelopes, or photograph and store digitally)
3. Spreadsheet or app tracking income and expenses
4. Mileage log in the van

Make it easy: Photograph receipts on your phone immediately. They fade and get lost. Apps like FreeAgent, QuickBooks Self-Employed, or even a folder in Google Drive work fine.

Self Assessment Deadlines

Key dates:

• Tax year: 6 April to 5 April
• Register for self-assessment by 5 October after your first tax year
• Online filing deadline: 31 January
• Payment deadline: 31 January (plus payment on account in July)

Penalties for late filing:

• Instant £100 fine after 31 January
• Additional penalties after 3, 6, and 12 months
• Interest on late payments

Do You Need an Accountant?

DIY is fine if:

• Your affairs are simple (sole trader, no VAT)
• You're organised with records
• You're willing to learn the basics

Get an accountant if:

• You're earning enough that their fee saves more in tax
• You're considering going limited
• You're VAT registered
• You hate this stuff and will avoid it otherwise

A good accountant typically costs: £300-800/year for basic self-assessment. They usually save you more than they cost if you're earning decent money.

Common Mistakes to Avoid

• Not saving for tax: Put 25-30% of profit aside immediately. Tax bills in January hurt less when the money's already there.
• Mixing personal and business: Use separate accounts. It's not optional.
• Throwing away receipts: No receipt, no claim. Simple.
• Forgetting to claim legitimate expenses: Those DeWalt batteries are a business expense. Claim them.
• Waiting until January: Doing a year of records in one weekend is painful. Monthly updates take 30 minutes.

The Bottom Line

Tax doesn't have to be complicated. Keep records, save regularly, claim what you're entitled to, and file on time. Do those four things and you'll be ahead of most self-employed tradesmen.