---
title: How a £10,000 Pension Contribution Can Boost Your Take-Home Pay (and Your Future Wealth)
description: Earning over £100k? Discover how a £10,000 pension contribution could save you thousands in tax, protect free childcare, and boost your future wealth.
image: https://esxr.co.uk/hubfs/250811%20Salary%20trap.webp
---

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# How a £10,000 Pension Contribution Can Boost Your Take-Home Pay (and Your Future Wealth)

![Business owner juggling work and childcare](https://esxr.co.uk/hubfs/250811%20Salary%20trap.webp)

- August 11, 2025

![Dean Shepherd CTA FMAAT, Chartered Tax Adviser, ~30 years experience](https://esxr.co.uk/hubfs/Dean03.webp)

[Dean Shepherd CTA FMAAT, Chartered Tax Adviser, ~30 years experience](https://esxr.co.uk/blog/author/dean-shepherd)

If you earn a six-figure salary, it’s easy to think “an extra £10,000 is just more money in the bank.” But the UK tax system doesn’t work like that.

In fact, if you earn £110,000 instead of £100,000, you could end up with **a lot less of that £10,000 in your pocket than you expect**.

That’s because of a sneaky tax trap that kicks in once your income passes £100,000 — and a well-timed pension contribution can be your escape route.

 

### **The £100,000–£125,140 Danger Zone**

Once your income goes above £100,000, you start to **lose your personal allowance** (the amount of income you can earn tax-free).

For every £2 you earn over £100,000, you lose £1 of this allowance. By the time you reach £125,140, you’ve lost it completely.

This creates an **effective tax rate of 60%** in that income band:

- 40% higher-rate income tax

- Plus an extra 20% because you’re being taxed on income that would otherwise be tax-free.

### **The Numbers — £110,000 vs £100,000 (2025/26)**

| Salary | Income Tax | National Insurance | Take-Home Pay |
| --- | --- | --- | --- |
| **£100,000** | £27,432 | £4,011 | £68,557 |
| **£110,000** | £33,432 | £4,211 | £72,357 |

That extra £10,000 of salary only leaves you with **£3,800 more** in your pocket.

 

The rest — **£6,200** — goes straight to HMRC.

 

### **How a Pension Contribution Changes the Game**

If, instead of taking the £110,000 as salary, you **pay £10,000 directly into your pension** via salary sacrifice, your taxable income drops back to £100,000.

Here’s what happens:

- You keep your full £12,570 personal allowance

- You avoid the 60% effective tax band

- You still get the full £10,000 invested for your retirement

### **Why You Might Get £11,500 in Your Pension Instead of £10,000**

When you sacrifice £10,000 of salary into your pension:

- Your employer saves £1,500 in NI (15% of £10,000)

- Some employers keep this saving

- Many pass it into your pension along with your contribution

If they pass it all on, your pension pot gets:

- £10,000 (your sacrificed salary)

- £1,500 (employer’s NI saving)
  
  = **£11,500** total

If they also make their regular pension contributions on top, the number could be even higher.

 

### **It Gets Worse! — The Childcare Trap**

Crossing the £100,000 income mark doesn’t just hurt because of the 60% tax rate.

It can also mean **losing access to valuable government support**.

Right now, parents of 3–4 year olds in England can get **up to 30 hours of free childcare a week** (worth several thousand pounds per year) if both parents earn under £100,000 each.

From September 2025, this will extend to younger children too.

If your income tips over £100,000 by even **£1**, you could lose this entitlement entirely.

That means:

- A £10,000 salary increase could actually **cost you £5,000–£8,000 or more** in lost childcare support on top of the extra tax.

- In extreme cases, the combined effect of tax, NI, and lost childcare can leave you **worse off overall** than if you’d stayed under £100,000.

By using pension contributions or other allowable deductions to bring your **adjusted net income** back under £100,000, you could preserve your free childcare entitlement and avoid this hidden pay cut.

 

 

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---

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