The Trading Allowance Trap: Why Saving Tax Could Cost You Your State Pension

If you became self-employed in 2024 and are now preparing your first tax return for the 2024/25 tax year, you may have come across the trading allowance — a simplified way to reduce your tax bill. It sounds like a win: avoid detailed expense tracking and knock up to £1,000 off your taxable profit. But for those with low income, especially first-time or part-time self-employed individuals, this shortcut might come with a hidden cost: losing out on valuable National Insurance (NI) credits that count towards your future state pension.

In this article, we explain how the trading allowance works, the interaction with NI and your pension record, and how to avoid getting caught in this increasingly common trap.

Self-Employment and National Insurance: The Basics

When you work for yourself, you’re not just responsible for your tax — you also have to think about National Insurance. Unlike income tax, National Insurance plays a direct role in your entitlement to the state pension and certain other benefits.

If your profits are high enough, you’ll pay Class 4 NI contributions as part of your self-assessment return. But if your profits are modest or below the income tax threshold, the situation becomes more complex — and potentially problematic.

Since April 2024, Class 2 NI contributions have been abolished for most self-employed people. Instead, if your income exceeds the Small Profits Threshold (SPT), you’re treated as if you’ve paid Class 2 contributions — even though you don’t actually part with any money.

• The SPT for 2024/25 is £6,725.
• For 2025/26, it will rise slightly to £6,845.

If your annual profits exceed the SPT, you get a qualifying year for your state pension automatically — with no Class 2 NI charge.

But if your annual profits are below the SPT, you don’t qualify for NI credits automatically and may need to voluntarily pay Class 2 NI contributions to ensure the year counts towards your state pension record.

Why the Trading Allowance Can Be a Problem

The trading allowance lets self-employed individuals reduce their taxable profit by up to £1,000 instead of deducting actual business expenses. If your total turnover is below £1,000, the allowance applies automatically (unless you choose to opt out). If your turnover is more than £1,000, you have to actively choose to claim it.

Sounds simple. But here’s the catch.

If claiming the trading allowance reduces your reported profit below the SPT (£6,725), you won’t automatically receive NI credits — which means the tax year won’t count towards your state pension entitlement.

Real-World Example: Where Things Go Wrong

Emma is a self-employed private tutor. She started her business in April 2024, and her total income for the year was £7,200. Her business expenses came to £500.

On paper, she could:

• Deduct £500 of expenses → taxable profit = £6,700
• Or claim the £1,000 trading allowance → taxable profit = £6,200

If Emma opts for the trading allowance, her taxable profit drops below the SPT of £6,725. That means she loses the automatic NI credit for the 2024/25 tax year.

This may not sound dramatic, but it could reduce her future pension by 1/35th — a shortfall she would need to plug later by making voluntary NI contributions, currently costing £3.50 per week, or £182 per year.

To avoid this, Emma should simply use the actual expenses method, report a profit of £6,700, and retain her qualifying year status.

Should You Claim the Trading Allowance?

The decision hinges on one question: Will claiming it reduce your reported profit below the Small Profits Threshold?

If yes, and you’re not otherwise entitled to NI credits (e.g. through child benefit or carer’s allowance), you could miss out on a valuable year of pension entitlement. That’s a big price to pay for saving a small amount of income tax.

When the Trading Allowance Works Well

In some cases, the trading allowance is still the right choice:

• You earn well above £12,570 and are paying income tax regardless.
• You don’t have many actual expenses — and want to save time on admin.
• You’re already getting NI credits through another route (e.g. you’re a parent receiving child benefit).
• You expect to voluntarily top up your NI record later anyway (though this comes at a cost).

But if your business is modest or part-time — perhaps it’s a side hustle, early-stage venture, or fits around childcare — you’ll want to consider your NI position carefully.

Tip: You Can Backdate Voluntary NI Payments

If you do miss a qualifying year, not all is lost. You can pay voluntary Class 2 NI contributions for up to six years after the tax year ends. This gives you time to assess whether you need to fill the gap later.

Still, this shouldn’t be seen as a fallback option. It’s always cheaper and easier to secure NI credits in real time than to make voluntary payments retrospectively.

Summary: Trading Allowance vs. State Pension Credit

Final Thoughts: Don’t Let Simplicity Cost You in the Long Run

The trading allowance is a great tool for simplifying your tax return — but it isn’t always the best choice. For low-income self-employed individuals, it can result in the loss of vital National Insurance credits, which directly affect your future state pension entitlement.

Before choosing the allowance, calculate your total turnover, assess your expenses, and most importantly — check whether your profit stays above the Small Profits Threshold.

At Merranti Accounting, we help self-employed clients make tax-efficient decisions that also safeguard their future benefits. If you’re unsure whether to use the trading allowance this year — or want to understand your NI and pension position — we’re here to help.

Contact us today to ensure your first year of self-employment sets you up for success — not a shortfall.