SIPP Charges Comparison Calculator
Compare how platform fees, fixed annual charges, and trading costs can affect your self-invested personal pension over time. Model two providers side by side and see the long-term impact on your projected pension value.
Calculator Inputs
Enter your pension assumptions and compare two SIPP charging structures.
Comparison Results
See projected end values, total fees paid, and the estimated difference in outcome.
Enter your values and click Calculate comparison to estimate the long-term impact of SIPP charges.
- This calculator uses a simplified projection based on monthly compounding.
- Charges are estimated from platform fee, fixed annual fee, and annual dealing costs only.
- Fund manager fees, bid-offer spreads, and taxes are not included unless captured in your assumptions.
Expert Guide to Using a SIPP Charges Comparison Calculator
A SIPP charges comparison calculator is one of the most practical tools available to UK pension investors who want to make smarter decisions about long-term costs. A self-invested personal pension gives you flexibility, but that flexibility often comes with a more complex charging menu than a traditional workplace pension. In practice, the provider with the lowest headline annual fee is not always the cheapest overall. A percentage platform fee may look attractive for smaller portfolios, while a flat-fee structure may become better value once your pension pot grows. Add dealing fees, fund costs, and the pattern of your contributions, and the picture can change quickly.
This is exactly why a robust comparison calculator matters. Instead of focusing on a single number from a provider pricing page, the calculator helps you model how charges compound over time. Over ten, twenty, or thirty years, even a difference of a few tenths of a percent can potentially reduce your final retirement value by thousands of pounds. For larger pots, the gap can be much wider.
The calculator above compares two providers using the key inputs that drive most SIPP cost differences: your current pension value, your future contributions, your expected growth rate, the provider platform fee, any fixed annual account fee, and regular trading costs. By combining those assumptions, it estimates your projected end value and your total cumulative fees. It then highlights which option appears cheaper under your assumptions.
Why SIPP charges matter so much over the long term
Many people underestimate the impact of charges because annual percentages look small in isolation. A 0.45% platform fee may not sound materially different from 0.25%, especially in a strong market year. However, pension investing is a compounding process. Charges do not only reduce your current balance. They also reduce the future growth you would have earned on the money taken in fees. This is often called fee drag.
If you hold a pension for twenty years, every pound removed in fees stops compounding for the rest of the investment period. The larger your pension becomes, the more percentage-based fees can matter. That is why flat-fee SIPPs often become more competitive for higher-value portfolios, while percentage-based platforms can work well for investors starting with smaller balances or making regular contributions into funds.
Key point: a good SIPP charges comparison calculator should not just compare prices today. It should estimate the effect of those prices on your future pension value after years of growth and ongoing contributions.
The main types of SIPP charges to compare
When investors compare providers, they should separate charges into categories. This avoids false comparisons and gives a clearer picture of the true all-in cost.
- Platform fee: Usually charged as a percentage of assets or as a flat annual fee. This is often the biggest visible cost difference between providers.
- Fixed annual account fee: Some SIPPs charge a fixed administration fee regardless of portfolio size.
- Dealing or trading costs: These apply when buying or selling shares, ETFs, investment trusts, or other instruments. Frequent investors should pay close attention here.
- Fund ongoing charges: Not usually a provider fee, but still a real cost borne by the investor. This calculator focuses on provider charges, so you should separately review fund OCFs.
- Exit or transfer fees: Less common than before, but still worth checking if you expect to move provider later.
- Drawdown charges: Important if you are closer to retirement and expect to take flexible withdrawals from the same provider.
How this calculator works
This calculator projects your pension monthly over the term you choose. It starts with your current pot, adds your contributions, applies an estimated monthly growth rate, then deducts a monthly equivalent of percentage platform charges and allocates annual fixed and dealing charges across the year. It repeats this process through the full term. The outcome is not a guaranteed forecast. It is a planning model designed to compare charging structures on a like-for-like basis.
- Enter your current SIPP value.
- Add your expected monthly or annual contribution amount.
- Choose your investment term in years.
- Set an expected annual gross growth rate before fees.
- Input platform fee percentages for both providers.
- Input any fixed annual fee and expected annual dealing costs.
- Run the calculation and compare projected end values and total fees.
What a strong SIPP comparison should include beyond the calculator
While cost matters, choosing a SIPP provider should not be based on charges alone. A provider that is slightly more expensive might still be a better fit if it offers lower trading friction, a broader investment universe, stronger customer support, or more suitable retirement options. For example, some platforms are especially competitive for passive fund investors but less attractive for share and ETF traders. Others impose tiered pricing, fee caps for certain assets, or separate custody charges that affect the total cost profile.
You should also consider the provider’s operational quality. Can you make contributions easily? Does the platform support regular investing? Are statements clear? Are tax certificates easy to access? What happens when you move into drawdown? A low charge is only one part of long-term pension value.
Important UK pension facts and statistics to keep in mind
Any SIPP comparison should sit within the broader context of UK pension rules. At the time of writing, the standard annual allowance for pension contributions is generally £60,000 for many savers, subject to earnings and tapering rules in some cases. The Money Purchase Annual Allowance is generally £10,000 for individuals who have flexibly accessed pension benefits. In addition, many people can usually take up to 25% of pension benefits as tax-free cash, subject to applicable rules and limits.
| UK pension reference point | Current figure | Why it matters in a charges comparison |
|---|---|---|
| Standard annual allowance | £60,000 | Higher contributions can make low-percentage platforms look more expensive over time if the pot grows quickly. |
| Money Purchase Annual Allowance | £10,000 | If triggered, contribution planning changes and fee efficiency on existing assets can become more important than new contributions. |
| Typical tax-free portion of pension benefits | Up to 25% | Charges paid before retirement can reduce the total amount available for future tax-free and taxable withdrawals. |
| FSCS protection limit for investment business claims | Up to £85,000 per eligible person, per firm | This does not remove investment risk, but platform structure and protection limits remain part of provider due diligence. |
The practical takeaway is simple: pension charges should be considered alongside the tax rules and contribution limits that shape your retirement strategy. A calculator helps you understand the cost side, but your contribution pattern and tax position can influence which charging model makes most sense.
Example of how fee structures can flip as your pot grows
Suppose Provider A charges 0.45% a year with a low fixed fee, while Provider B charges a flat annual fee of £180 and lower trading costs. If your pension is relatively small, Provider A may cost less because 0.45% of a modest balance is still below Provider B’s flat fee. But once your pension grows to six figures, a percentage fee may exceed the flat-fee option by a meaningful margin each year. This is why a calculator should be run more than once using different future pot sizes and contribution assumptions.
| Illustrative pot size | 0.25% percentage fee | 0.45% percentage fee | Flat annual fee |
|---|---|---|---|
| £25,000 | £62.50 | £112.50 | £180 |
| £50,000 | £125.00 | £225.00 | £180 |
| £100,000 | £250.00 | £450.00 | £180 |
| £250,000 | £625.00 | £1,125.00 | £180 |
The figures above are not provider quotes. They are simple examples showing how fee mechanics differ. The lesson is that the cheapest SIPP for a £25,000 pot may not be the cheapest for a £250,000 pot. A comparison calculator allows you to test that transition directly.
When a percentage-fee SIPP may make sense
- You are early in your investing journey with a smaller pension balance.
- You invest mainly in funds and make regular contributions.
- You do not trade individual shares frequently.
- You prefer a simple charging model with fewer separate line items.
When a flat-fee SIPP may make sense
- Your portfolio is already substantial or expected to grow significantly.
- You want to reduce the long-term drag from percentage-based custody or platform fees.
- You are comfortable checking dealing fees and platform features in more detail.
- You hold assets where any platform fee caps or fixed pricing become particularly valuable.
Common mistakes when comparing SIPP charges
- Comparing headline percentages only. A lower percentage can still cost more if fixed charges and dealing costs are high.
- Ignoring fund costs. Provider fees are only one part of total investment cost.
- Using today’s balance only. Pension pots often grow materially over time, changing which fee model is best.
- Overlooking contribution patterns. Frequent contributions can increase trading-related costs on some platforms.
- Ignoring retirement functionality. Drawdown fees and retirement support can matter later, even if they are irrelevant today.
- Failing to test multiple scenarios. A robust decision should include conservative, central, and optimistic growth assumptions.
How often should you review your SIPP charges?
At a minimum, review your SIPP charges once a year. You should also revisit them whenever any of the following changes occur: your pension pot grows significantly, you switch from funds to exchange-traded investments, you begin regular trading, you consolidate pensions, or you approach retirement and need drawdown access. A charging model that suited you five years ago may now be materially less competitive.
It is also sensible to rerun a calculator after major provider repricing. Platform charges can change, fee caps can be introduced or removed, and dealing bundles can alter the true annual cost. A quick comparison can reveal whether your current provider remains good value.
Authoritative resources for UK pension rules
For official UK guidance relevant to pension planning and SIPP decision-making, review these resources:
- GOV.UK: Pension tax relief
- GOV.UK: Annual allowance for pension savings
- GOV.UK: Personal pensions and your rights
Final thoughts on choosing the right SIPP
The best SIPP is not automatically the one with the lowest visible fee. It is the provider that delivers the strongest combination of cost-efficiency, suitable investment access, platform usability, and retirement functionality for your personal circumstances. A SIPP charges comparison calculator brings discipline to that decision by translating provider charging structures into pounds and pence over time.
If you are a smaller investor making regular monthly contributions into funds, a percentage-fee platform may remain highly competitive. If your pension pot is larger, or you expect strong long-term growth, a flat-fee provider may preserve more of your future value. The only reliable way to know is to run the numbers using your own balance, contribution level, and timeline.
Use the calculator as a decision-support tool rather than a guarantee. Then verify each provider’s latest pricing schedule, investment availability, service standards, transfer process, and retirement options before acting. Charges matter, but they work best as part of a broader, evidence-based pension strategy.