A Simple Guide to National Insurance for the Self-Employed (2025/26)

If you’re self-employed in the UK, understanding National Insurance Contributions (NICs) is essential. It’s one of the main taxes you’ll pay, but it’s also one of the most misunderstood.

This guide explains what National Insurance is, how much you’ll pay in 2025/26, and why it matters for your future.

What Is National Insurance?

National Insurance is a tax on earnings that helps fund state benefits, including:

• The State Pension

• Maternity allowance

• Certain sickness and unemployment benefits

If you’re self-employed, you don’t pay NICs through PAYE. Instead, you pay them through your Self Assessment tax return to HMRC.

What Types of National Insurance Do the Self-Employed Pay?

There are two main types:

1. Class 2 National Insurance

Class 2 NICs are a flat weekly amount, but recent changes mean:

• If your profits are above £12,570, you are treated as having paid Class 2 NICs (even if you don’t physically pay them)

• This means you still build entitlement to the State Pension

If your profits are below this level, you can choose to pay voluntary Class 2 contributions to maintain your record.

2. Class 4 National Insurance

Class 4 NICs are based on your profits:

• 6% on profits between £12,570 and £50,270

• 2% on profits above £50,270

These are calculated automatically as part of your Self Assessment.

How Much National Insurance Will You Pay?

Here’s a simple example:

Annual profit: £30,000

• Class 2: Covered automatically (no payment required, but you get the benefit)

• Class 4:

  • £30,000 – £12,570 = £17,430

  • 6% of £17,430 = £1,045.80

So your total NIC liability would be just over £1,000 for the year.

Why National Insurance Matters

It’s tempting to see NICs as just another tax, but they actually determine your eligibility for important benefits.

State Pension

To qualify for the full State Pension, you typically need 35 qualifying years of National Insurance contributions.

Even if your profits are low, maintaining your NIC record is crucial for your long-term financial security.

What If Your Profits Are Low?

If your profits are below £12,570, you won’t automatically build National Insurance credits.

In this case, you may want to:

• Pay voluntary Class 2 contributions (usually very cost-effective)

• Protect your future entitlement to the State Pension

This is often overlooked, but it can make a big difference later in life.

How and When Do You Pay National Insurance?

National Insurance is paid alongside your Income Tax through Self Assessment:

• Deadline: 31 January following the end of the tax year

• You may also need to make payments on account toward the next year

Everything is calculated and submitted to HMRC in one go.

Common Mistakes to Avoid

• Not realising you still qualify for Class 2 credits above the threshold

• Ignoring voluntary contributions when profits are low

• Forgetting to budget for Class 4 NICs

• Confusing NICs with Income Tax (they are separate liabilities)

Final Thoughts

National Insurance might seem complicated, but the basics are straightforward:

• Class 2 helps protect your State Pension

• Class 4 is based on your profits

• Both are calculated through your Self Assessment

Understanding how NICs work helps you plan ahead, avoid surprises, and protect your future benefits.

At Highway 61, we help self-employed individuals stay on top of their tax obligations and make sure nothing important gets missed.

Not sure if you’re paying the right National Insurance? Get in touch today for clear, tailored advice.