SIPP Charges Comparison Calculator
Estimate and compare the long-term cost of percentage-based and flat-fee Self-Invested Personal Pension charging structures. Adjust your pension value, annual contributions, growth rate, trading frequency, and investment horizon to see how platform charges can affect your retirement pot.
Calculator Inputs
Comparison Results
Enter your details and click Calculate SIPP Charges to compare cumulative fees, ending pension values, and the estimated savings from selecting the cheaper charge structure.
Expert Guide: How to Use a SIPP Charges Comparison Calculator Effectively
A SIPP charges comparison calculator helps investors estimate how pension platform fees can influence long-term retirement outcomes. A Self-Invested Personal Pension gives you greater control over where your money is invested, but that flexibility can come with a wide range of costs. Some providers charge a percentage of your assets every year. Others charge a flat custody fee, with separate dealing costs for shares, exchange-traded funds, or funds. At first glance the differences may look small, but over 10, 20, or 30 years, charges can create a meaningful drag on compounding.
This calculator is designed to compare two common charging approaches. Provider A uses a percentage-based annual platform fee, while Provider B can be modeled either as a flat annual fee or a percentage fee. Both can include dealing charges, which matters if you invest monthly, rebalance frequently, or build a portfolio using ETFs and individual securities rather than a single multi-asset fund. By testing your current pension size, annual contributions, growth assumptions, and trading frequency, you can identify the structure that may be more cost efficient for your own circumstances.
Fees should never be the only factor when choosing a pension provider. Investment choice, service, online usability, transfer support, drawdown functionality, and financial strength all matter too. However, cost is one of the few variables that can be measured clearly in advance. Using a calculator helps you move beyond headline percentages and estimate the cumulative pound-and-pence impact over time.
Why SIPP charges matter so much
The effect of charges is amplified by compounding. If your pension grows at 5% a year before fees and you lose 0.25% to platform charges plus trading costs, those costs do not just reduce one year’s balance. They also reduce the amount left to compound in every future year. That is why a difference that looks modest in year one can become substantial over a multi-decade retirement saving journey.
For example, percentage fees often feel manageable when your pension pot is small. A 0.25% platform fee on a £20,000 account is only £50 a year before any trading costs. But on a £300,000 pension, the same fee becomes £750 a year. At that point, a flat-fee provider may become more competitive, especially for buy-and-hold investors who trade infrequently. On the other hand, if your balance is still modest or your chosen provider includes fund dealing at no extra cost, a percentage-based structure may remain attractive.
Main charge types inside a SIPP
- Platform or administration fee: Charged either as a percentage of assets or as a flat annual amount.
- Dealing fees: Paid when you buy or sell shares, ETFs, investment trusts, or in some cases funds.
- Fund ongoing charge figure: The annual cost of the fund itself, separate from the SIPP provider platform fee.
- Drawdown fees: Some providers charge for setting up or operating income drawdown in retirement.
- Transfer or exit costs: Less common than before, but still worth checking.
- Cash interest terms: Low interest on uninvested cash can also act as a hidden drag.
Although this calculator focuses on platform and dealing fees, sophisticated investors should always review the total cost of ownership. A cheap SIPP platform can still be expensive if the available funds carry high internal charges. Likewise, a slightly more expensive platform may be better value if it offers the exact investment tools, reporting, and retirement options you need.
What the calculator is actually doing
The calculator projects your SIPP forward over the number of years you choose. It applies the growth rate you enter, adds annual contributions based on your selected timing, then deducts annual platform and trading charges. It repeats this process separately for Provider A and Provider B. The final output shows:
- Total estimated charges paid to each provider over the selected period.
- Projected ending pension value after growth, contributions, and charges.
- The difference in total charges between the two providers.
- The resulting difference in ending pension value.
This type of comparison is especially useful when deciding whether a larger pension pot has reached the tipping point where a flat annual fee becomes cheaper than a percentage fee. There is no universal answer because the crossover point depends on portfolio size, trading frequency, and fee schedule.
Comparison table: percentage fee versus flat fee economics
| Pension value | 0.25% annual platform fee | 0.15% annual platform fee | Flat fee example | Simple interpretation |
|---|---|---|---|---|
| £50,000 | £125 per year | £75 per year | £180 per year | A low percentage fee may be cheaper than a flat fee at smaller balances. |
| £100,000 | £250 per year | £150 per year | £180 per year | The crossover point starts to emerge. Flat and percentage charging can be very close. |
| £250,000 | £625 per year | £375 per year | £180 per year | Flat annual charging may become clearly advantageous for large, stable pots. |
| £500,000 | £1,250 per year | £750 per year | £180 per year | Large pension balances can make percentage fees significantly more expensive. |
The figures above are illustrative annual platform costs before dealing charges and fund costs. They show why investors with larger balances often examine flat-fee providers closely. If you rarely trade and your portfolio is straightforward, annual savings can be meaningful.
Real context and useful statistics
In the UK, pension fee sensitivity is not a niche issue. Millions of savers are now responsible for choosing retirement products and understanding costs. According to the UK government, auto enrolment has brought workplace pension participation to very high levels among eligible employees, helping more people build retirement savings over time. As pension balances grow, charge awareness tends to increase because even a small percentage fee can represent hundreds of pounds a year. You can review official participation data through the UK government at gov.uk.
The Financial Conduct Authority has repeatedly emphasized the importance of value for money, transparency, and consumer understanding in retirement products. While not a .gov domain, the FCA remains the UK financial regulator and its publications are highly relevant when reviewing pensions, charges, and consumer outcomes. For official government-backed retirement basics, the State Pension overview at gov.uk provides helpful planning context.
Academic sources also support the broad principle that fees matter materially over long horizons. For educational context on retirement saving and compounding, university research and extension publications frequently show that incremental annual costs can produce large cumulative differences in ending wealth. One accessible educational resource is provided by the University of Kentucky Cooperative Extension at uky.edu.
Comparison table: long-term charge drag illustration
| Scenario | Initial pot | Annual contribution | Years | Gross growth | Charge difference | Potential impact |
|---|---|---|---|---|---|---|
| Early-stage investor | £25,000 | £3,600 | 20 | 5% | 0.10% a year | Often noticeable, but may be outweighed by investment access and service. |
| Mid-career accumulator | £100,000 | £6,000 | 20 | 5% | 0.10% a year | Can translate into several thousand pounds over time, depending on trading and growth. |
| Large established SIPP | £300,000 | £10,000 | 20 | 5% | Flat fee versus 0.25% | The lower-cost provider may preserve a materially larger ending balance. |
These scenarios are not provider recommendations and they are not guarantees of future results. They simply show the scale of the issue. Once investors reach six-figure pension balances, the case for detailed cost comparison becomes much stronger.
How to interpret your results
If one provider appears cheaper by only a small amount, look beyond the headline saving. Ask whether the lower-cost provider also offers the investments, retirement flexibility, app experience, customer support, tax documents, and transfer process you want. Saving £30 a year is useful, but not if the service becomes restrictive or inconvenient. Conversely, if the calculator shows a gap of several hundred pounds a year, that cost difference deserves serious attention.
Also remember that dealing charges can flip the result. A flat-fee SIPP might look excellent for a buy-and-hold investor who purchases one or two funds and rebalances annually. But if you are making monthly ETF purchases, switching positions frequently, or building a diversified share portfolio, repeated dealing costs can erode the flat-fee advantage. The same applies in reverse: a percentage-based provider with free fund dealing may work well for fund investors, even if the annual platform fee looks less attractive once the account becomes larger.
Best practices when comparing SIPP providers
- Check whether fund dealing is free while share and ETF dealing is charged.
- Review annual custody caps, if any, for shares, ETFs, or funds.
- Read the provider’s schedule for drawdown, transfers, and paper statements.
- Confirm whether your preferred funds, trusts, ETFs, or international shares are available.
- Assess service standards, financial strength, and digital usability.
- Consider whether your balance is likely to grow enough for a flat fee to become more attractive later.
Limitations of any calculator
No online calculator can capture every possible pension charge. Real providers can have tiered rates, fee caps, promotional discounts, custody minimums, or different pricing by asset type. Growth is never smooth, and your future contribution pattern may change. This tool should therefore be treated as an informed estimate rather than a promise of exact future outcomes.
The calculator also does not include investment fund charges, inflation, tax relief mechanics, contribution allowances, employer contributions, or sequence-of-returns risk. It focuses on one question only: how much might one charging structure cost relative to another over time?
When a SIPP charges comparison calculator is most useful
This kind of tool is especially valuable if you are transferring an old workplace pension, consolidating several pensions into one SIPP, or crossing a major pension-value threshold where flat-fee pricing becomes competitive. It is also useful before retirement, when drawdown fees and service quality become more relevant. Investors with larger portfolios often benefit from running several scenarios: a cautious growth assumption, a higher growth assumption, low trading frequency, and high trading frequency. If the same provider remains cheaper across multiple scenarios, your decision becomes more robust.
Final takeaway
A SIPP is a powerful long-term savings wrapper, but costs matter. The right provider for a £25,000 pension may not be the right provider for a £250,000 pension. A disciplined comparison process can reveal whether a percentage charge still makes sense or whether a flat-fee structure could preserve more of your retirement wealth. Use the calculator above to test realistic assumptions, compare cumulative charges, and see how provider costs may affect your future pension value. Then combine those findings with broader due diligence on service, investment range, retirement features, and financial strength before making any transfer or investment decision.