Building a portfolio from scratch — deciding on an asset allocation, selecting individual funds, and then maintaining and rebalancing it over time — is a meaningful commitment for anyone without a strong interest in doing it themselves. Many platforms, fund managers and financial publications offer an alternative: a ready-made "model portfolio", a pre-built combination of funds designed to suit a stated risk level or goal. These can be a genuinely useful shortcut, but they also involve trade-offs that are worth understanding before adopting one wholesale.
What a model portfolio actually is
A model portfolio is a specific combination of funds, usually built around a stated objective — such as "cautious", "balanced" or "adventurous" — and typically maintained and periodically rebalanced by the provider on behalf of anyone who follows it. Model portfolios come from several sources:
- Platform-provided model portfolios, built by the investment platform itself, often using a mix of funds available on that platform.
- Discretionary fund manager (DFM) model portfolios, run by a professional investment manager, sometimes accessible via a platform's managed portfolio service.
- Multi-asset "all-in-one" funds, which are not technically model portfolios but achieve a similar outcome within a single fund wrapper.
- Published model portfolios from financial media or research houses, intended as illustrative starting points rather than a managed service.
The case for using a model portfolio
Time and expertise
A model portfolio removes the need to research individual funds, decide on an asset allocation, and continually monitor and rebalance the result. For an investor without the time, interest, or confidence to do this themselves, a well-constructed model portfolio can provide a reasonably diversified starting point that would otherwise take considerable research to replicate.
Discipline
Because a model portfolio is rebalanced by the provider rather than the individual investor, it removes some of the behavioural risk of an investor tinkering with their own allocation in response to short-term market moves.
Access to professional research
Model portfolios from discretionary managers are typically informed by dedicated investment research teams, which many private investors would not otherwise have access to.
The case for caution
Generic risk profiling
A model portfolio labelled "balanced" or "moderate risk" is built for a generic investor matching that label, not for an individual's specific circumstances, time horizon, other assets, or capacity for loss. Two people who both describe themselves as "balanced" investors may have very different actual needs — one nearing retirement with little other savings, another decades from retirement with a secure income and a separate emergency fund — yet a single model portfolio cannot reflect both.
Ongoing cost
Model portfolios, particularly discretionary managed ones, often carry an additional layer of cost on top of the underlying funds' own charges — sometimes a portfolio management fee in addition to the platform fee and fund charges. Over long periods, this additional layer compounds in the same way any other cost does.
Lack of personalisation for tax
A model portfolio does not know whether it is held in an ISA, a SIPP, or a taxable general investment account, and typically will not adjust its fund selection to reflect that an income fund, for example, may be less tax-efficient outside a wrapper than inside one.
Reduced understanding
Following a model portfolio can mean an investor holds funds they do not fully understand and cannot explain the rationale for, which may make it harder to stay invested with confidence during a market downturn.
| Factor | Model portfolio | Self-built portfolio |
|---|---|---|
| Time required | Low | Higher, ongoing |
| Personalisation | Generic risk band | Can reflect individual circumstances precisely |
| Typical cost | Underlying funds plus a management layer, in many cases | Usually just the underlying funds and platform fee |
| Rebalancing | Handled by provider | Investor's own responsibility |
| Understanding of holdings | Often limited | Typically higher, since the investor chose each fund |
Questions to ask before adopting a model portfolio
- What is the total cost, including any portfolio management fee on top of the underlying funds' own ongoing charges?
- How is "risk" defined and measured for this particular model, and does that match your own understanding of your risk tolerance?
- How often is the portfolio rebalanced, and is that rebalancing automatic or does it require you to act?
- Can the model portfolio be held across an ISA, a SIPP and a general investment account, or is it tied to a specific account type or platform?
- What happens if you want to deviate slightly — for example, excluding a fund you are uncomfortable with?
How model portfolios are typically labelled and matched to investors
Most providers ask new investors to complete a risk questionnaire, then match the resulting risk score to one of a handful of pre-built model portfolios — commonly labelled something like "defensive", "cautious", "balanced", "growth" and "adventurous", though the exact naming and number of bands varies by provider. It is worth understanding that this matching process, while a useful starting point, compresses a genuinely individual set of circumstances into a small number of broad categories, and the questionnaire itself may not fully capture factors such as other assets held elsewhere, upcoming large expenses, or a specific reason for a shorter or longer time horizon than the questionnaire assumes.
How often model portfolios themselves are reviewed
Providers typically review and, where needed, adjust the composition of their model portfolios on a periodic basis — sometimes quarterly, sometimes annually — reflecting changes in the manager's or research team's views on markets. This means an investor following a model portfolio may occasionally see its underlying fund composition change without having requested or initiated that change themselves, which is a different experience from managing a self-built portfolio where every change is a deliberate personal decision.
Discretionary managed portfolio services in more detail
A discretionary fund manager (DFM) model portfolio service goes a step further than a simple pre-set fund combination: a professional manager has ongoing discretion to make tactical adjustments to the portfolio's composition in response to changing market conditions, without needing to seek approval from each individual investor before doing so. This can appeal to investors who want professional, actively managed oversight without paying for a fully bespoke, one-to-one wealth management relationship, though it typically comes at a higher cost than a simpler, less actively adjusted model portfolio, and the manager's tactical decisions will not always prove correct in hindsight.
A middle path: model portfolios as a starting point
Some investors use a published model portfolio not as something to follow exactly, but as a reference point or sense-check for a self-built portfolio — comparing their own asset allocation against a well-researched example to see whether it is broadly sensible, without committing to replicate it fund-for-fund or paying for an ongoing managed service.
A worked example
Suppose a hypothetical investor is comparing two options for a £30,000 SIPP: a platform's "balanced" managed portfolio service, charging an additional 0.30% a year on top of underlying fund charges of roughly 0.40%, giving a blended cost of around 0.70% a year; versus building their own two-fund portfolio using a global equity tracker and a global bond fund with a blended cost of around 0.20% a year. Over 25 years, that 0.50 percentage point annual difference, compounded, could amount to a meaningfully different final portfolio value, all else being equal — though this is a simplified illustration and does not account for any difference in the two approaches' actual investment returns, which could favour either option.
Model portfolios and behavioural discipline during a downturn
One under-appreciated benefit of a model portfolio, particularly a discretionary managed one, is that the decision to sell during a market downturn is not made by the individual investor in a moment of panic — it is made, if at all, by the portfolio manager according to a stated process. For investors who know from past experience that they are prone to selling at the worst possible time during a market fall, this removal of a personal decision point can have genuine value, even if it comes at an additional cost, because staying invested through a downturn is often more important to long-term outcomes than the specific fund selection within the portfolio.
That said, this benefit is not unique to model portfolios — an investor holding a simple, well-diversified self-built portfolio and committing in advance not to make emotionally-driven changes can achieve a similar outcome without the additional management fee, provided they have the discipline to stick to that commitment without external oversight.
Reviewing a model portfolio periodically, even once adopted
Adopting a model portfolio is not necessarily a permanent, one-off decision either. As personal circumstances change — a change in income, a new financial goal, an approaching retirement date — it is worth periodically checking that the risk band originally chosen still matches current circumstances, and considering whether switching to a more or less cautious model within the same range, or moving away from a model portfolio approach entirely, might now be more appropriate. Treating the initial choice as a considered starting point rather than a permanently fixed decision applies just as much to a model portfolio as it does to a self-built one.
Key takeaways
- Model portfolios offer convenience, professional research and built-in rebalancing, which can suit investors who prefer a hands-off approach.
- They are built for a generic risk profile, not for an individual's specific circumstances, tax position, or other assets.
- Additional management fees on top of underlying fund charges can add a meaningful cost over long periods.
- A model portfolio does not typically adjust its fund selection for whether it is held in an ISA, SIPP or taxable account.
- Some investors use model portfolios as a reference point for building their own, rather than adopting one outright.
- Always check current HMRC and FCA figures and allowances, as these change from tax year to tax year.