DIY Investment Platforms vs Financial Advice

A low-cost investing platform is the right tool when the decisions in front of you are simple, reversible, and cheap to get wrong. Financial advice earns its fee when the decisions start pulling against one another, carry tax or legal consequences, or would be difficult to undo. Age and balance matter less than most people assume. What matters is the weight of the decision and whether you can carry it on your own.

The comparison is usually argued as a fee debate. It is closer to a scope debate. A platform gives you access and execution. Advice adds personalised judgement, planning, and accountability. Some platforms now sell more than execution and some advisers give narrow product advice, so the line is not as clean as either side claims, but it is clean enough to be useful. If you are unsure whether your situation calls for professional help at all, start by working out whether you need a financial adviser.

What platform, advice, and investment management actually mean

A platform helps you implement decisions. An adviser helps you make them. Investment management delegates the agreed portfolio decisions entirely.

A self-directed platform is an execution service: you choose the investments and decide when to buy and sell, and the platform processes the order and holds the assets. Financial advice is a regulated service, where a licensed adviser recommends a course of action based on your circumstances, within a scope you both agree at the outset. It can be narrow, covering a single decision, or broad, covering your whole position.

Investment management goes further. Under a Discretionary Investment Management Service licence, a firm makes the day-to-day buy, sell, and rebalance decisions on your behalf within parameters you have already agreed, without returning to you for each transaction. It suits people who want the decisions made properly and do not want to make them. Become Wealth holds a Financial Advice Provider licence and a DIMS licence from the Financial Markets Authority, and you can read how our investment management service works in more detail.

The categories overlap, so the question is not which one to pick. It is which level of help the decision deserves.

How to decide between a platform and an adviser

Most of it comes down to a short sequence.

• What decision are you actually facing? Choosing a fund is a different problem from choosing when to retire.
• How do the parts connect? A decision touching tax, debt, insurance, ownership structure, or a partner’s position is rarely a standalone investment decision.
• What would a material mistake cost, and could you undo it? Reversible and cheap points towards DIY. Expensive and permanent points towards advice.
• What level of help do you want?

That last question is where most comparisons go wrong, because they treat it as a choice between two things. Your options run from doing everything yourself to delegating everything, with one-off advice, a plan you implement alone, and periodic reviews in between.

What DIY investment platforms do well

Minimum investments have fallen from thousands of dollars to loose change, fractional units let you own a slice of a global portfolio for a week’s coffee budget, and automated contributions turn regular investing from a discipline into a default. Most platforms now offer broad index funds at management fees which would have seemed impossible twenty years ago. The Financial Markets Authority’s consumer guidance on online investing platforms credits them with making investing accessible at smaller amounts and lower cost, and with being a practical way to learn by doing.

If you are building a first portfolio from salary, this is close to ideal. Not because young investors can afford mistakes, which depends entirely on what the money is for. Someone saving a house deposit for next year has very little room for error, while the same person investing for a retirement four decades away has a great deal. What matters is the horizon of the goal, your capacity to absorb a loss without changing how you live, and whether you have an emergency fund and no expensive debt behind it. Platforms suit a particular temperament at any age: you read widely, check your own behaviour honestly, and have already held through a full market cycle. Such investors are rarer than internet forums imply, because forums select for enthusiasm rather than results.

What an execution-only platform will not do

Open an execution-only account and notice what nobody asks you. Nothing about the mortgage carrying a higher interest cost than your bonds are likely to earn. Nothing about the income protection a single-earner household is missing. Nothing about whether your investments should sit in personal names, a trust, or a company, or about the retirement date you have named but never costed.

An adviser has to ask, though how widely depends on what you have engaged them for. Advice must be suitable, and suitability is judged within the scope you agree at the start, which the adviser must make sure you understand. A narrow engagement about a single fund needs less information than a full plan, while a comprehensive planner looks much wider, because decisions about investments, debt, insurance, tax, and retirement keep colliding. The Code of Professional Conduct for Financial Advice Services sets the standards for adviser behaviour, separate disclosure regulations govern what you must be told about fees, commissions, and conflicts, and the FMA’s guidance on working with a financial adviser sets out good practice. The asking is the point. An investment is only good or bad relative to the job you need it to do.

It is often said a platform cannot give personal guidance without becoming a regulated adviser. That is not quite right: several New Zealand platforms now offer recommended portfolios under their own licence. The useful distinction is functional. An execution-only service will not assess whether your overall position makes sense, while a regulated advice service will, within whatever scope it has agreed, which on a platform is usually limited to the investments held there.

The regulator has a checklist for people investing without advice, the five Ds of DIY investing. The fifth is, if in doubt, talk to a financial adviser. When the checklist written for people avoiding advice ends by recommending advice, the boundary is worth mapping precisely.

What does a DIY investment platform really cost in New Zealand?

Less than advice, usually, and more than the fee schedule suggests. The visible costs are straightforward: management fees on the underlying funds, transaction or brokerage charges, currency conversion on offshore holdings, and any account fee. Your numbers live in the published fee schedule and your annual statement. The least counted item appears in neither, which is your hours.

Some costs are charged to you directly. Others are embedded elsewhere, and those are the ones worth finding. Several of the largest retail platforms in New Zealand charge the investor little or nothing and are instead paid by the fund managers whose products sit on the platform, through a distribution fee or commission negotiated with each manager. This is disclosed, and the biggest say so plainly on their own pricing pages. What it is not is itemised: the money comes out of the fund’s management fee, so you pay it and never see a number against your name. Some are also paid from the interest on cash sitting in your account while you earn nothing on it. A platform advertising no fees is describing what it does not charge you directly, rather than what your money costs.

Worth noticing too is which of your activities earns the platform money. Where a platform is paid per transaction and on currency conversion, its revenue rises the more you trade and the more often you move between currencies, and a twenty-year hold generates almost nothing for it. The individual fees are usually small and this does not make anyone dishonest. It does mean the commercial interest of an execution platform and the interest of a long-term investor are not perfectly aligned.

Advice fees take a few common shapes: a percentage of the assets under advice, a fixed retainer, a one-off fee for a defined piece of work, or a blend. A licensed adviser must disclose how they are paid before you commit, so your number is knowable in advance. Where a firm accepts commission and where it does not varies by product inside the same firm, so ask about each.

Is a financial adviser worth the fee?

Only where the planning, implementation, or behavioural value is relevant to you and reasonably exceeds what it costs. That is the whole test, and for a good number of people the honest answer is no.

“Comparing a platform fee against an advice fee is a bit like comparing a supermarket shop with a restaurant meal. The groceries are cheaper. They are also not dinner. You still have to plan it, cook it, and clean up afterwards, and be good enough at all of it for the result to be worth eating.”

Joseph Darby, Chief Executive, Become Wealth

Plenty of people cook very well and enjoy it. The point is not against DIY. It is against pretending the two prices measure the same thing.

Where advice does earn its keep, the numbers can be lopsided. Deliberately simplified: a 1% annual advice fee on a $500,000 portfolio is $5,000 in the first year, before tax treatment, GST where it applies, and the underlying fund fees you would pay on either path. A single panicked exit and mistimed re-entry costing that portfolio 10% is $50,000, and it appears on no statement anywhere. Those are not the same kind of number. The fee recurs and is certain, while the mistake may never happen and advice does not guarantee it is avoided. Both figures are placeholders for the shape of the problem rather than anyone’s pricing.

The tax and ownership questions New Zealand investors need to check

Two global share funds can look nearly identical on a platform and produce quite different outcomes once tax and ownership are accounted for. This is where New Zealand comparisons stop resembling American or British ones, and it is the part most skip.

• Is the investment a portfolio investment entity, and if so have you given the correct prescribed investor rate? The wrong rate overpays tax in one direction or creates a bill in the other.
• Does the holding fall under the foreign investment fund rules, and if so, which calculation applies and what will you need to file?
• Will the platform give you tax reporting you can actually use, or will you assemble it yourself each year?
• Do you own the securities directly, or beneficially through a custodian, and what happens to your holdings if the provider fails?
• What does an offshore purchase cost in total, including the foreign exchange spread as distinct from the advertised conversion fee?
• Can you transfer investments out to another provider, and what does that cost? Transfer-out fees are easy to overlook until you want to leave.

Two smaller points belong on the same list: how uninvested cash is held and who earns the interest on it, and whether certain offshore assets complicate matters for your executors.

Your KiwiSaver belongs in the same view. It is one of the largest financial investments many New Zealanders hold, and it is often considered separately from a self-directed portfolio. A DIY portfolio built without reference to KiwiSaver asset allocation, contribution rate, employer contributions, government contribution eligibility, and whether the money is earmarked for a first home or for retirement is half a portfolio with the other half ignored.

Behaviour, the cost which never shows on a statement

In research published by the FMA in 2021, 31% of online DIY investors said they had entered an investment in the previous two years because they did not want to miss out, and 27% said they had invested on a recommendation from someone they knew without doing their own research. The figures are historical, but they describe behavioural risks worth testing against your own process.

Platform design does not sit neutrally alongside this. In a randomised trial of 9,140 people published by the UK Financial Conduct Authority in 2024, push notifications and a points-and-prize-draw feature each increased the number of trades participants made, by 11% and 12%. Every feature tested pulled attention away from a paid alternative task, and flashing prices reduced how often participants opened the key information on risk and past performance. The effects were largest among those with lower financial literacy, and on portfolio risk among under-35s. Trading more frequently is separately associated with lower returns.

The commercial logic behind that design is not hidden. Where a platform earns on each transaction and each currency conversion, engagement is revenue. The features the FCA tested are not necessarily the ones on your app, so the useful exercise is to look at what yours puts in front of you, and whether it prompts activity or patience.

The rest is you. Your portfolio is on your phone, selling everything takes four taps, and the line between investing and trading blurs quickly at 11pm after a grim headline.

A large part of an ongoing advice relationship is a circuit breaker: someone who knows your plan, answers the phone in a downturn, and can show you the modelling you agreed to when you were calm. It only has value if you use it before you act. Clients rarely list this as the reason they engaged us. Years later, it is frequently the reason they stayed.

Do you need ongoing advice, or would one piece of advice do?

Advice can be bought for a single defined decision, such as what to do with the proceeds of a house sale. It can be a one-off financial plan you then implement yourself, a second opinion on a portfolio you have already built, a review every few years, or advice limited to KiwiSaver. Or it can be ongoing investment management, where the day-to-day decisions are delegated.

The FMA surveyed 1,000 New Zealanders in September 2025 and published the findings in March 2026. Affordability was the most common barrier to getting advice at 31%, not knowing where to start was second at 26%, and 34% said they would prefer advice funded by commission rather than paid for upfront, even knowing it might create a conflict. That preference does lower the barrier, provided the commission, the product range it covers, and the conflict are understood. A defined piece of work at a fixed fee is the other answer to the same problem, and our fees are published rather than quoted on request.

When does DIY investing make sense?

DIY through a platform is a sound choice when most of the following hold:

• The decisions in front of you are investment decisions, rather than tax, structure, or retirement-timing decisions
• A serious loss would be painful but would not change how you live, and you have an emergency fund and no expensive debt behind you
• Your goals are far enough away for time to absorb an early mistake
• You have held investments through a serious fall without selling, or can honestly model how you would behave
• You are comfortable handling your own tax position, reporting, and administration

The case for leaving well alone gets far less attention than it deserves. Picture someone in her thirties holding three low-cost index funds, contributing automatically each fortnight, prescribed investor rate correctly recorded, a written rule to rebalance each March, KiwiSaver set deliberately rather than by default, and nothing needing the money inside a decade. She has already held through a 20% fall without selling. Paying an ongoing percentage would buy her very little she is not already doing, and a conversation every few years would serve her better.

Do the choosing properly, though. Fee schedules, custody arrangements, tax treatment, and the range of investments differ enough between platforms for the comparison to be worth an evening of your’s time, and the FMA guidance linked above covers what to check, including how to recognise the scams which impersonate legitimate platforms. General rankings cannot determine suitability for your goals.

When is it time to get financial advice?

The calculus shifts as complexity accumulates, and usually before you notice. Common tipping points from our own client base:

• A windfall arrives, whether an inheritance, a business sale, a property sale, or a redundancy payout, and a sum which took decades to build now needs deploying in months
• Retirement moves from abstract to imminent, and the problem inverts from accumulating money to drawing it down without outliving it
• A decision is large enough, or permanent enough, that getting it wrong would set your plans back by years
• Your affairs now span property, business interests, trusts, or two countries, and the tax and ownership questions have outgrown general reading
• You and your partner disagree about risk, or you have run out of time, interest, or confidence, and the portfolio is drifting

Few of these are about picking better funds. One boundary is worth being clear about: an adviser can identify a structuring, estate, or tax issue and coordinate the planning around it, but ownership structures and wills are legal work and tax positions are accounting work, so expect a good adviser to bring in a solicitor or an accountant rather than answer those alone. If you reach one of these points, choosing the right financial adviser is its own piece of due diligence.

What advice changed for one client

The following is a composite drawn from several advisory engagements, with identifying details changed and numbers rounded. It illustrates a pattern rather than promising what advice changes for any individual.

A client we will call Craig came to us in his late forties, holding a little over $400,000 across two platforms after eight years of disciplined monthly investing. By any DIY standard he was a success story. His 27 holdings looked diversified, but on a look-through basis roughly two thirds tracked the same handful of large American technology companies. He had sold about a third of the portfolio during a slump and rebought months later at higher prices. He was the sole earner with no income protection, his will predated his second child, and he hoped to drop to part-time work at 60 without ever having costed it.

Some of this he could have found himself. The fund overlap was visible in the fund documents, and the insurance gap needed no adviser to notice. The harder task was connecting the issues and testing the retirement goal against them. We consolidated the overlapping funds, rebuilt the allocation around a thirteen-year horizon, then stress tested what a repeat of past drawdowns would do to the part-time-at-60 plan. We arranged the income protection. The will we did not touch, because drafting wills is legal work, so he took it to a solicitor, and one holding’s tax treatment went to his accountant.

There were costs on the other side: an ongoing fee he had not previously paid, a tax consequence on consolidating some holdings, and several weeks of his own time. He judged the trade worth making. Not everyone would.

Can you use an adviser and keep your investment platform?

Yes, and it takes several forms. You can buy a one-off plan and keep the entire portfolio where it already sits, pay for a review every few years, or take advice on KiwiSaver alone and leave everything else self-directed. The best known arrangement is a managed core alongside a self-directed sleeve: a core portfolio sized to fund the outcomes you cannot afford to miss, beside a smaller self-managed allocation for conviction ideas, at a size where being wrong is affordable.

The risk in running both is duplication you cannot see: the same global index in each, inconsistent risk settings between them, and a speculative sleeve quietly treated as separate from total portfolio risk right up until the market decides otherwise. Checking the overlap is something some investors can do themselves with the fund documents and an afternoon.

For transparency on how this works here: our investment recommendations draw on research from external providers rather than products manufactured by us, because we have no products of our own and are not owned by a bank, insurer, platform, or fund manager. For investment management we receive no commissions, and any fund manager rebate negotiated on your holdings is paid into your portfolio rather than kept by us. For mortgages and insurance we do receive commission, which is what allows that advice to be given at no or low cost. All of it is in our disclosure statement. Because of that structure, telling you to keep money on a platform you already like is an available answer, and we give it when it fits.

How to decide

Name the decision, and check whether it is an investment question or a tax, structure, or timing question underneath. Weigh what a mistake would cost and whether you could undo it. Choose the level of help it deserves rather than the category, and compare total costs on both paths, including how the platform is paid and your own hours.

Then write down the rules, whichever way you go: automated contributions, a written allocation, and a decision made in advance about what you will do in a downturn. The rules are what survive the moment your judgement is under pressure.

If that review identifies decisions needing personalised analysis, book a no-obligation conversation and we will help define which parts of your position deserve closer attention.