Sole Trader UK: Setup, Tax, NI and Day-to-Day Essentials
Freelancer Tax Guide UK — Self-Employed Tax Explained Simply
Everything freelancers need to know about UK tax. Income tax, National Insurance, expenses, allowable deductions, and how to complete your Self Assessment.
Start here: Freelancing Hub.
Freelancing offers flexibility but requires understanding your tax obligations. Here’s your complete guide.
Tax Overview
What Freelancers Pay
| Tax |
Who Pays |
| Income Tax |
On profits over £12,570 |
| Class 2 NI |
If profits over £6,725 |
| Class 4 NI |
On profits over £12,570 |
| VAT |
If turnover exceeds £90,000 |
Tax Calculation Example
| Freelancer with £40,000 Profit |
Amount |
| Profit |
£40,000 |
| Personal Allowance |
-£12,570 |
| Taxable income |
£27,430 |
| Income Tax (20%) |
£5,486 |
| Class 2 NI |
£179 |
| Class 4 NI (6% on £12,570-£40k) |
£1,646 |
| Total Tax/NI |
£7,311 |
Income Tax Rates 2025/26
Tax Bands
| Band |
Income |
Rate |
| Personal Allowance |
£0-12,570 |
0% |
| Basic Rate |
£12,571-50,270 |
20% |
| Higher Rate |
£50,271-125,140 |
40% |
| Additional Rate |
Over £125,140 |
45% |
Personal Allowance Taper
| Income Over £100k |
Allowance Reduced |
| For every £2 over |
£1 less allowance |
| At £125,140 |
No Personal Allowance |
National Insurance
Class 2 NI
| Detail |
Amount |
| Weekly rate |
£3.45 |
| Annual cost |
£179.40 |
| Threshold |
Profits over £6,725 |
| Now voluntary |
Below threshold |
Class 4 NI
| Profit Band |
Rate |
| £12,570-50,270 |
6% |
| Over £50,270 |
2% |
NI Example
| Profit £50,000 |
Calculation |
| Class 2 NI |
£179 |
| Class 4 (6% on £37,700) |
£2,262 |
| Total NI |
£2,441 |
Getting Started
Registration Timeline
| Action |
Deadline |
| Register as self-employed |
By October 5th in second tax year |
| Best practice |
Register immediately |
| Penalties |
For late registration |
How to Register
| Step |
Action |
| 1 |
Register for Self Assessment |
| 2 |
Receive UTR (Unique Taxpayer Reference) |
| 3 |
Set up Government Gateway |
| 4 |
Keep records from day one |
Allowable Expenses
Home Office
| Expense |
How to Claim |
| Proportion of rent/mortgage interest |
Based on workspace |
| Proportion of utilities |
Gas, electric, water |
| Proportion of council tax |
Same method |
| Simplified method |
£6/week (£312/year) |
Working from Home Calculation
| Method |
Example |
| Rooms method |
1 of 5 rooms = 20% |
| Area method |
10 of 50 sqm = 20% |
| Hours method |
For shared spaces |
Equipment and Technology
| Expense |
Deductible |
| Computer |
Full cost or capital allowances |
| Software |
Full cost |
| Phone |
Business portion |
| Internet |
Business portion |
| Office furniture |
Full cost |
Travel
| Allowable |
Not Allowable |
| Travel to clients |
Home to regular workplace |
| Travel between sites |
Commuting |
| Hotels for business |
Personal travel |
| Meals (overnight only) |
Regular meals |
Mileage Rates
| First 10,000 Miles |
After 10,000 |
| 45p per mile |
25p per mile |
| Or actual costs |
If higher |
Professional Costs
| Expense |
Example |
| Professional memberships |
Industry bodies |
| Training |
Relevant to work |
| Books/publications |
Work-related |
| Insurance |
Professional indemnity |
| Accountant fees |
Full cost |
Marketing
| Expense |
Deductible |
| Website costs |
Full cost |
| Business cards |
Full cost |
| Advertising |
Full cost |
| Portfolio |
Work-related |
What You Can’t Claim
Non-Deductible
| Expense |
Why Not |
| Own salary |
Drawings, not expense |
| Personal clothes |
Even if “work” clothes |
| Parking/speeding fines |
Penalties |
| Entertainment |
Except very limited |
| Food (unless overnight) |
Personal expense |
Record Keeping
What to Keep
| Record |
How Long |
| Invoices issued |
5 years minimum |
| Receipts for expenses |
5 years minimum |
| Bank statements |
5 years minimum |
| Contracts |
Duration + 6 years |
Systems
| Method |
Pros |
| Accounting software |
Automated, reports |
| Spreadsheet |
Simple, cheap |
| Paper + box |
Minimum standard |
Recommended Software
| Software |
Cost |
Best For |
| FreeAgent |
£19-38/month |
Full features |
| QuickBooks |
£15-30/month |
Growing businesses |
| Xero |
£15-47/month |
Popular choice |
| Wave |
Free |
Basic needs |
Self Assessment
Key Dates
| Date |
Deadline |
| April 5th |
Tax year ends |
| October 5th |
Register for new self-employment |
| October 31st |
Paper tax return |
| January 31st |
Online return + payment |
| July 31st |
Second payment on account |
Payments on Account
| What |
Amount |
| First payment (31 Jan) |
50% of previous year |
| Second payment (31 July) |
50% of previous year |
| Balancing payment |
Any remaining |
Example Payment Schedule
| Date |
Payment |
| Jan 31st 2026 |
Balance for 2024/25 + 50% for 2025/26 |
| July 31st 2026 |
50% for 2025/26 |
| Jan 31st 2027 |
Balance + new payments on account |
VAT
Registration Threshold
| Threshold |
Action |
| Turnover over £90,000 |
Must register |
| Turnover under £90,000 |
Optional |
| Deregistration threshold |
£88,000 |
Flat Rate Scheme
| Benefit |
How It Works |
| Simpler accounting |
Fixed % of turnover |
| May keep difference |
Between collected and paid |
| Limited cost traders |
16.5% |
Standard VAT
| Rate |
Applies To |
| 20% |
Most goods/services |
| 5% |
Some (energy) |
| 0% |
Some (books, food) |
| Exempt |
Some services |
Pension Contributions
Why Important
| Factor |
Details |
| No employer pension |
Must arrange own |
| Tax relief |
At marginal rate |
| State Pension |
NI contributions count |
Options
| Option |
Details |
| Personal pension |
SIPP |
| Stakeholder pension |
Lower charges |
| Annual allowance |
Up to £60,000 |
Tax Relief
| Example |
Benefit |
| £8,000 contribution |
£10,000 in pension |
| Higher rate taxpayer |
Claim additional 20% |
| Effective cost |
£6,000 |
IR35 and Contractors
What Is IR35?
| Concept |
Meaning |
| Off-payroll rules |
Are you really employed? |
| Inside IR35 |
Pay tax like employee |
| Outside IR35 |
Normal self-employment |
Determining Status
| Factor |
Inside |
Outside |
| Control |
Client controls how |
You decide how |
| Substitution |
Must do personally |
Can send someone else |
| Mutuality |
Ongoing obligation |
Project by project |
If Inside IR35
| Consequence |
Impact |
| Client deducts tax |
At source |
| Limited company |
No tax advantage |
| Equivalent to employee |
For tax purposes |
Tax-Saving Strategies
Legitimate Approaches
| Strategy |
Benefit |
| Claim all valid expenses |
Reduce taxable profit |
| Pension contributions |
Tax relief + future income |
| Marriage Allowance |
If spouse low earner |
| ISA savings |
Tax-free growth |
Timing Income
| Strategy |
When |
| Defer invoicing |
If income spike |
| Accelerate expenses |
Before year end |
| Split income years |
Smooth tax bills |
Getting Help
When to Use Accountant
| Situation |
Benefit |
| Turnover over £30-50k |
Worth the cost |
| Complex arrangements |
IR35, multiple sources |
| VAT registered |
Quarterly returns |
| First year |
Set up properly |
Accountant Costs
| Service |
Typical Cost |
| Annual accounts |
£200-500 |
| Tax return |
£150-300 |
| Bookkeeping |
£50-150/month |
| Full service |
£100-300/month |
Summary
| Key Deadline |
Date |
| Tax year end |
April 5th |
| Register |
October 5th |
| Paper return |
October 31st |
| Online + pay |
January 31st |
| Payment on account |
July 31st |
| Key Rate |
Amount |
| Basic Income Tax |
20% |
| Higher Income Tax |
40% |
| Class 2 NI |
£3.45/week |
| Class 4 NI |
6% / 2% |
| VAT threshold |
£90,000 |
You Might Also Find Useful