Self-Employments
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.
23 March 2026
·
5 min read
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