UK Pension Calculator 2026/27

How the Pension Calculator Works

This calculator uses standard compound growth to project how your pension pot could grow between now and your target retirement age. It factors in your own contributions, your employer's contributions, any existing pot, and a chosen investment growth rate.

Compound Growth

The power of compound growth means your pot earns returns not just on your contributions, but on all previous growth too. A modest monthly contribution in your 30s is worth significantly more than the same contribution started in your 50s, because it has more time to compound. Starting early is the single most impactful decision you can make.

How Pension Tax Relief Works

One of the most valuable features of a pension is tax relief — the government tops up your contributions based on your income tax rate:

• Basic rate taxpayer (20%): For every £80 you put in, the government adds £20, so £100 goes into your pot. Your real cost is £80.
• Higher rate taxpayer (40%): You contribute £100 gross. Your real cost is £60 (you claim the extra 20% back via Self Assessment).
• Additional rate taxpayer (45%): Your real cost per £100 contributed is just £55.

Employer contributions are also free of Income Tax and National Insurance — making them effectively worth more than equivalent salary.

The Annual Allowance 2026/27

The Annual Allowance is the maximum total amount that can be paid into your pension and receive tax relief in a tax year. For 2026/27 it is £60,000 — including both your own contributions and your employer's. It is capped at 100% of your earnings if that is lower. If you exceed the allowance, you face a tax charge on the excess. Very high earners (above £260,000 adjusted income) face a tapered annual allowance — consult an adviser if this may apply to you.

The 4% Rule

The estimated monthly income shown is based on the widely-used 4% rule: withdrawing 4% of your pot per year, divided by 12. Research suggests this rate is sustainable over a 30-year retirement under typical market conditions. This is an estimate — actual income depends on how you draw down your pension (drawdown vs annuity), investment returns in retirement, and your personal circumstances.

Auto-Enrolment

Since 2012, most UK employers are legally required to auto-enrol eligible workers into a workplace pension. The legal minimums are 5% from you and 3% from your employer (a combined 8% of qualifying earnings). Many employers offer more, particularly as a salary benefit — always check if your employer will match additional contributions, as this is effectively free money.

What This Calculator Does Not Include

• State Pension: Not included. The new State Pension adds additional retirement income on top of your private pot — check your State Pension forecast on GOV.UK.
• Investment charges: Fund management charges (typically 0.1–1% p.a.) will reduce your real return — factor this into your growth rate selection.
• Inflation: Projections are in nominal (today's money equivalent) terms. Real purchasing power will be lower depending on inflation over the period.
• Defined Benefit pensions: This calculator is for Defined Contribution pensions only. DB (final salary) pensions are calculated differently.

Worked Examples

Three realistic scenarios showing how contributions and time compound into retirement income. All projections use the stated growth rate with monthly compounding.

All projections are estimates based on stated growth rates with monthly compounding and level contributions. Actual returns vary. Not financial advice.

Frequently Asked Questions

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