Lumpsum VS Monthly Investing
Mo Shouman
Why Waiting Usually Costs You
This is a newsletter issue I never sought I'd publish. If you have been with me for a while, then you know I am not usually the one to discuss short term market or investments tactics I've always believed in taking strategic long term view.
But I have heard many of you loud and clear. Over the past few months I've been getting more questions from Tech leaders than ever about timing the market and lump sum investment vs a monthly drip makes more sense. So this months, I am giving you exactly what you asked for: a complete guide to understand both tactics and which one would work better for you.
You've just received your bonus. Or your RSUs vested. Or you got a redundancy package through the wave of redundancies coming through every few months. Now you're holding five figures (or more) in cash, sitting in a savings account or an offset while you decide what to do with it.
You sit at your desk with a cup of coffee and start researching. You Google investment questions and suddenly you're drowning in advice about dollar-cost averaging (DCA), the strategy where you invest your money gradually over time. Say $5,000 a month for 12 months instead of putting $60,000 in during week one.
It sounds careful and safe. And as human beings, we like safety.
But if you ask me, it's usually costing you real money.
This isn't just my opinion. It's partly experience, but let me use my favourite way of deciding strategies for my clients: data. And for tech professionals facing redundancy anxiety and the need to build passive income with clarity matters more than winging it.
A quick note before we start: if your lump sum is a redundancy payment and you don't have your next role locked in yet, that money may need to be your income for a while. Build your safety buffer first (more on that below). Everything in this issue applies to money you won't need to touch.
And if your lump sum is in your employer's shares, the first question isn't timing. It's how much of your wealth sits in one company. That's Step 4 of The Confident Choice System™: Reduce Concentration Risk.
The Research: Lump-Sum Wins. Usually.
Let me start with the most cited research on this question: Vanguard's 2012 study, which compared rolling 10-year periods in the US, UK and Australian markets using a balanced 60/40 portfolio.
In Australia, investing the lump sum straight away beat a 12-month dollar-cost averaging plan about two-thirds of the time (66%), with an average ending value around 1.3% higher. The US and UK results were similar, with an even bigger average gap.
Two-thirds of the time.
That's not a small edge. That's a consistent pattern. It's also not a guarantee: in roughly one period in three, DCA came out ahead.
Let me put it in dollars. As an illustration, say you invest $100,000 and it grows to around $200,000 over 10 years:
• Lump-sum approach: invest it all in week one. On the historical average, you finish about 1.3% ahead, roughly $2,600.
• DCA approach: invest $8,333 a month for 12 months. It feels less risky. On average, you finish about $2,600 behind.
On $100k, that's a few thousand dollars left on the table for the sake of feeling safer.
On $500k? Around $13,000. On the seven-figure sums I see from RSU vests at Atlassian, Microsoft and Canva? Over $25,000.
And it doesn't happen once. It repeats with every bonus and every vest across your career. So, you are either compounding wins or losses. Your Choice.
Why This Matters Right Now for Tech Professionals
In the last few months the stock market felt wobbly and the tech giants ate going through big transformations. Let alone small and medium ones. So, working with smart tech professionals they knew they need help understanding what this means for them.
I was in back-to-back calls with high-earning tech professionals. Same conversation, different companies: "Mo, I'm hearing about another round of redundancies. How long do I have?"
It's the new baseline anxiety. And it's reshaping what 'Retirement' actually means.
The old retirement plan was: work until 65, retire with a lump sum, live on investment returns.
The new reality, the one I'm building plans around now, is: build passive income while you're still earning, so the next redundancy becomes a choice, not a catastrophe.
That changes how you should treat lump sums.
Putting your long-term money to work with purpose is one of the most effective ways to step off the income treadmill before someone else switches it off.
Every month long-term money sits idle is a month it isn't compounding. And when your goal is a passive income number that lets you turn down the next promotion, walk away from the next redundancy, or take that sabbatical, delay has a cost.
The Objections (And Why They're Smaller Than You Think)
I know the hesitations. I hear them every week. Let me address the real ones.
"But what if the market crashes right after I invest?"
Fair question. And I won't pretend it can't happen.
If you invest $100k and the market drops 20% the next week, you're sitting on $80k. That stings. In that scenario, the DCA investor does better, because their later payments buy in at lower prices. That's the one-in-three case from the research.
The problem is that nobody knows in advance which kind of year is coming. Historically, markets have risen more often than they've fallen, which is why investing straight away has won more often. And if your time horizon is 10 years or more, one bad entry point matters far less than your time in the market.
What hurts most is staying out altogether. Research from J.P. Morgan Asset Management on US shares found that missing just the 10 best days over a 20-year period would have dramatically reduced returns, and many of those best days came shortly after the worst ones, exactly when nervous investors were sitting in cash.
"What if I need the money soon?"
Then it shouldn't be invested in shares at all, whether all at once or gradually. That's a cash reserves question, not an investment strategy question. Build your emergency fund first (6 to 12 months of expenses), then invest the rest with conviction. If you don't have this in place, you are just another lazy tech professional who don't understand the reality of his career and fluctuating earning potential.
"Won't I pay more tax when I invest?"
This is a fixed mindset and seriously, stop reading this and go scrolling on social media, it will hypnotise you for a little bit longer.
If you don't want to make money just because you will pay the cost of making money then you want the 'free lunch' and let me tell you, it doesn't exist. You have to pay money to make money. You pay interest on the loan to grow your property, you pay the property agent to find you a good tenant etc.
The tax on earning is a return, not a penalty for investing early. Holding off to avoid tax on returns you haven't earned yet is backwards logic.
"The emotional hit of watching it drop feels worse than missing some gains."
Okay, this one I respect. This is the behavioural objection, and it's honest. Even Vanguard's own research acknowledged that if your main concern is short-term losses and regret, DCA may be the better choice for you.
Here's my answer: if you can't stomach a 20% fall, your portfolio probably isn't set up correctly for you, and you may need a different asset allocation. Drip-feeding money in doesn't fix that. A plan you can actually hold through downturns does.
And if investing everything at once would keep you up at night, a shorter plan, say over three months, captures most of the benefit while easing the nerves. DCA usually beats leaving money in cash.
That's what The Confident Choice System™ is designed to do: create a structure that lets you sleep at night, even when markets don't cooperate.
The Lump-Sum Framework for Tech Professionals
You've got irregular income. Bonuses land once or twice a year. RSUs vest in tranches. Redundancy arrives as a lump. This is your reality.
Here's how to invest without second-guessing:
Step 1: Separate your buckets
Split your cash into three piles:
Emergency reserves: 6 to 12 months of living expenses in a high-interest savings account or your offset account. This is sacred. Don't touch it.
Short-term needs: anything you'll need in the next 2 to 3 years (house deposit, car, wedding). Keep it out of the share market.
Long-term wealth: everything else. This is your lump-sum candidate.
Step 2: Have a written investment rule
Don't decide in the moment. Write it down now. For example:
• "I will invest my long-term money into my agreed diversified portfolio within 30 days of receiving it."
• "I will keep to my agreed mix of growth and defensive assets, and adjust it as I get closer to my goals."
• "I will review this plan annually, not daily."
(These are examples only. The right timeframe and asset mix depend on your situation.)
Boring? Yes.
Effective? Absolutely.
Having a written investment rule is funding my 7-9 weeks annual family holidays
Step 3: Address the tax piece upfront
If you're investing a large RSU or bonus payment:
•Understand your marginal tax rate (up to 47% including the Medicare Levy if you're a high earner, plus Division 293 on super contributions above the threshold).
• Plan for tax on dividends and on capital gains when you sell or rebalance. Holding an investment for more than 12 months generally gives you access to the CGT discount( remember this is changing on 1/7/2027) Don't let tax paralyse you, but factor it in.
• Consider whether super or other structures could improve tax efficiency alongside your investing, not instead of it. Keep the caps in mind: for 2026–27, the concessional cap is $32,500 and the non-concessional cap is $130,000. A large bonus usually can't all go into super.
Step 4: Your pay already averages you in
Here's the nuance: if your income arrives in chunks (bonuses, quarterly RSU vests, salary sacrifice every pay), you're already spreading your investing over time. That's fine. Invest each chunk when it arrives.
But don't sit on a $100k bonus for 12 months to smooth out the purchase price. Invest it according to your rule. Then when the next vest or bonus arrives, invest that too.
You're averaging into the market over time anyway. You're just not leaving cash idle in between.
The Real Cost of Waiting
Meet Sam. Senior engineer at a major tech firm. Receives a $150k bonus in March and thinks: "I should DCA this over 12 months, just to be safe."
Sam invests $12,500 a month for 12 months. Here's how that plays out in two different years:
Market over the year
Invest all at once
Invest $12,500 a month
Difference
Rises steadily 18%
~$177,000
~$164,300
Lump sum ahead ~$12,700
Falls steadily 15%
~$127,500
~$137,500
DCA ahead ~$10,000
In a strong year, waiting costs Sam more than $12,000. In a falling year, waiting helps. The research says the first kind of year has been the more common one, which is why the average edge sits with investing straight away.
Now multiply that decision by how many bonus cycles, RSU vests and lump sums Sam will receive over a career. Each one on its own is a modest edge. Repeated over 20 years, it compounds into a meaningful difference in how soon Sam's passive income can replace a salary.
Why Now Matters
I'm seeing something shift in the conversations I'm having with tech clients.
It's not panic. It's pragmatism.
People are realising that passive income isn't a nice-to-have goal for their 60s. It's a must-have shield for their 40s, because the next redundancy could come any quarter.
Every dollar of long-term money you invest today starts working for you now. Not next year, not after 12 months of drip-feeding. Now.
The best way to build that passive income? Invest your long-term money when you have it, with a plan you can stick to. Let it compound. Don't leave money on the sidelines waiting for the perfect entry point. That point doesn't exist.
The Bottom Line
Lump-sum investing isn't a bet against prudence. It's a bet on time.
The data leans clearly one way. And for tech professionals facing income uncertainty, the need to build assets is real. You don't need to time the market perfectly. You need to invest decisively when you have long-term money available, keep your safety buffer intact, and let compounding do the heavy lifting.
That's how passive income gets built. Not through perfection. Through clarity and consistency.
What This Means for You
This week: if you're holding a lump sum in cash (bonus, RSU proceeds, anything over $20k), sort it into the three buckets and write down your investment rule. When will the long-term portion go in? Into what mix?
This month: review your emergency fund. Make sure you have 6 to 12 months covered. Everything beyond that and your short-term needs is a candidate for investing.
This quarter: work out what staying in cash is really costing you each month, compared with your offset or your investments. Seeing the number makes the decision easier.
Need Help Clarifying Your Strategy?
If this sparked ideas but you're unsure how to build an investment plan that works for your situation, Join my Free Master Class on October 15th here.
In 60 minutes, you'll learn
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How to work out your runway: how many months you could cover if you were next
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What happens tax-wise every time your RSUs vest, and why "sell and forget" and "hold and hope" are both decisions
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Why having your pay and your savings riding on one company is a separate risk from whether you believe in the company
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How to calculate your Work-Optional Number: the figure where staying becomes a choice, not a necessity
If reading this surfaced your thoughts on building the passive income that makes redundancies feel optional, not catastrophic. Here are a few ways I can help you understand where you stand and start building real, lasting wealth from the income you already earn. No pressure, no chasing.
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Listen to my Podcast - Real financial strategies on the only podcast in the world dedicated to tech pros, no boring jargon.
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The Wealth Byte Newsletter - quick, no-BS emails once a month.
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Follow me on LinkedIn - over 6,000 tech pros already do.
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Wealth Bytes - YouTube - bite-sized videos on the only Youtube in the world dedicated to tech pros, no boring jargon.
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Work 1:1 with me - build a strategic, work-optional financial plan to retire early on 10-20k per month.
Mo!
Personal Update
• Shoal trip: just got back from a long weekend away. We rented a house rather than owning one. Pay for the accommodation, sleep on fresh sheets daily, and don't worry about maintenance, repairs or security. Just focus on the family. We checked out with a head full of memories and zero stress about the property. It's a good reminder that you don't need to own everything you enjoy. Put your capital into what compounds, and pay for flexibility where it makes sense.
• Reading: still working through my current list. If you want recommendations (Atomic Habits is still my favourite), let me know. I'm building a list of books that blend money psychology with life design, and I'm happy to share it.
• Client conversations: the redundancy anxiety is real. Every call this month has touched on it. And every time, it strengthens my conviction: passive income isn't a retirement fantasy anymore. It's a survival skill for tech professionals. That's why the lump-sum conversation matters now.
This is general information only and does not take into account your personal objectives, financial situation, or needs. It is not a recommendation to buy, sell, or hold any investment or to adopt any particular strategy. Tax treatment depends on your individual circumstances and on legislation that may change. Please consider whether it is appropriate for you, and seek personal advice, before acting. My Wealth Choice Pty Ltd is an Authorised Representative (No. 001247597) of Beryllium Advisers Pty Ltd (AFSL 528250).