Methodology and Assumptions

Projections assume contributions are made annually at the end (or beginning) of each year and grow at the constant effective annual rate you provide. HM Treasury and HMRC set annual allowance limits and tax relief rules—consult the official guidance before making changes. Investment markets fluctuate; use these figures as planning estimates rather than guarantees.

Formulas

How to Use This Calculator

1. Enter your current age and the age you expect to access your SIPP (minimum 55, rising to 57 in 2028).
2. Provide your current SIPP balance and annual contributions (gross).
3. Select the assumed annual growth rate (after fees). Adjust as needed to explore scenarios.
4. Choose whether contributions occur at the end or beginning of each year.
5. Review projected SIPP value, total contributions, and the sensitivity table.

Frequently Asked Questions

What is a SIPP?

A Self-Invested Personal Pension (SIPP) is a UK-approved personal pension allowing you to choose investments within HMRC rules.

Can I change the assumed growth rate?

Yes—enter any expected annual compound rate, net of fees. Test conservative and optimistic scenarios to understand the range of outcomes.

How accurate are these projections?

They illustrate how contributions could compound under constant growth assumptions. Actual market returns and charges will differ.

Can I include an initial lump sum?

Yes—the model compounds your current SIPP fund for the full years remaining to retirement.

When can I access my SIPP?

Currently from age 55 (rising to 57 in 2028). Withdrawals before this age face significant restrictions.

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FV_{\text{fund}} = P_0 (1 + r)^T

FV_{\text{contrib}} = \begin{cases} \mathrm{PMT} \cdot \dfrac{(1+r)^T - 1}{r} \cdot (1+r)^{\delta}, & r \ne 0\\[6pt] \mathrm{PMT} \cdot T, & r = 0 \end{cases}

FV_{\text{total}} = FV_{\text{fund}} + FV_{\text{contrib}}

Future value of current SIPP fund \[ FV_{\text{fund}} = P_0 (1 + r)^T \] Future value of annual contributions \[ FV_{\text{contrib}} = \begin{cases} \mathrm{PMT} \cdot \dfrac{(1+r)^T - 1}{r} \cdot (1+r)^{\delta}, & r \ne 0\\[6pt] \mathrm{PMT} \cdot T, & r = 0 \end{cases} \] where \( \delta = 1 \) for beginning-of-period contributions. Total projected SIPP value \[ FV_{\text{total}} = FV_{\text{fund}} + FV_{\text{contrib}} \]