SIPP Calculator — Self-Invested Pension

Project your Self-Invested Personal Pension with tax relief, employer contributions and growth.

Last updated: April 2026 · Source: GOV.UK

£
£
£

SIPP Value at Retirement

£441,819.38

25% tax-free lump sum: £110,454.84

Govt Tax Relief

£37,500.00

Gross Monthly

£625.00

Drawdown (~25yr)

£1,104.55/mo

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

A Self-Invested Personal Pension (SIPP) operates under relief at source: you contribute net of basic rate tax and the provider claims 20% from HMRC automatically. Contributing £800 net results in £1,000 gross in your SIPP. Higher and additional rate taxpayers reclaim the extra 20% or 25% through their self-assessment tax return. The SIPP invests across a wide range of assets including funds, shares, ETFs, investment trusts, and commercial property.

Growth projection uses compound interest on regular contributions plus tax relief top-ups. Monthly contributions of £400 net become £500 gross after basic rate relief. At 5% annual growth (net of platform and fund charges), £500/month over 25 years compounds to approximately £298,000. The calculator models different growth scenarios: cautious (3%), moderate (5%), and adventurous (7%) to show the range of possible outcomes.

SIPP access is currently available from age 55 (rising to 57 from April 2028 under the Pension Schemes Act 2021). At access, 25% can be taken as a tax-free lump sum, with the remainder drawn as taxable income via flexi-access drawdown. The calculator models both accumulation phase (contributions + growth) and decumulation phase (drawdown withdrawals), showing projected pot value and sustainable income at your chosen retirement age.

SIPP projection: £400/month net contribution over 25 years

  1. Net monthly contribution: £400. Gross after 20% tax relief: £500/month
  2. Assumed annual growth: 5% (net of 0.4% platform fee)
  3. After 25 years compounding: £500/month grows to approximately £298,000
  4. Tax-free lump sum (25%): £74,500
  5. Remaining £223,500 in drawdown at 4% = £8,940/year taxable income

Source: GOV.UK

Frequently Asked Questions

What does the SIPP Calculator — Self-Invested Pension do?
Project your Self-Invested Personal Pension with tax relief, employer contributions and growth. All calculations are performed in your browser using official UK rates and thresholds.
Are these figures guaranteed?
No. Pension projections are estimates based on assumed growth rates and current contribution levels. Actual returns depend on investment performance, fees and future policy changes.
What is the pension annual allowance?
The pension annual allowance for 2025/26 is £60,000. This is the maximum you can contribute (including employer contributions) and receive tax relief. The allowance is tapered for high earners.