Cash is Trash? So where should you actually put your cash in 2024

Do people still keep cash these days? If you have large amounts of cash lying around or in a bank account, then cash is trash! Depending on how much you have and where you are keeping it, there may be better options for you..


Bank accounts are a necessity in this day and age. But just like that deadbeat ex you might have had once, sticking to what you know and is familiar could be hurting you financially! Keeping cash under your mattress or having cash waiting in a savings account could mean you are losing money. Some of the best bank accounts are online banks with no fees, but is your money better off invested in hard assets such as good businesses, ETFs or property? Before you invest, have you built up a savings buffer or emergency fund, and where are you keeping it?

Let’s dive deeper..

CaptainFI is not a Financial Advisor and the information below is factual review information, not financial advice. This website is reader-supported, which means we may be paid by advertising on the site, or when you visit links to partner or featured sites. For more information please read my Privacy PolicyTerms of Use, and Financial Disclaimer.

cash is trash, australian cash
Keeping cash under your mattress or having cash waiting in a savings account could mean you are losing money.

The best bank account

The best online bank accounts are those which provide you with no fees and give you a decent savings interest rate on your balance. We all know that keeping too much cash isn’t a great idea due to inflation meaning that your purchasing power1 is actually eroding every year.

So having a decent savings interest rate paid on your cash lets you preserve some of your purchasing power (but we all know in the long run that savers are losers, and a smart investor like Warren Buffet will put their money to work in a low fee stock market index ETF).

Before I get into how to get the best bank account, I want to rehash a quick and dirty discussion on modern finance to keep everything in perspective and explain why I allocate assets the way I do…

“In a sense, purchasing power and inflation are two sides of the same coin. Purchasing power measures what a unit of currency can buy, while inflation measures rising prices.”

Louis Denicola – businessinsider.com1

Interest rates

Inflation is often called the ‘hidden tax’ on the working class. This is a very real tax that hurts savers. The Reserve Bank has some levers it can pull to keep the economy ticking along, and one of these levers is the overnight cash rate2 – essentially what lenders (the banks) have to pay each other for overnight outstanding settlements. This cash rate trickles down with second and third order effects through businesses and eventually hits you the consumer, as inflation or the rate of inflation (the rate at which stuff gets more expensive).

cash is trash, inflation
“Australia is experiencing record levels of inflation as a result of knock-on effects from the COVID-19 pandemic, the war in Ukraine and strong consumer demand.” – Jessica Mudditt – forbes.com10

The fact is that in today’s financial climate with historically incredibly low interest rates, cash is trash. Savers are most likely going backwards in terms of purchasing power, since the rate of inflation3 is higher than the interest you’ll receive on savings accounts or term deposits.

Savers are dumb

So let’s run through the math – let’s say you’ve got $100K in your savings account, earning a paltry 2% interest from a bank. At the end of the year, you’ve made a cool $2000 in passive income – great – or is it?

You know you’re going to lose some of this to the hidden secret power of inflation. But if you think that’s it, sorry there is more. You’ll also be hit with a double whammy which is the income tax that you’ll pay on the interest you earn from your savings! All the while the purchasing power of your cash is eroding – each year you can buy less and less with it. Sucked in, Savers! (Or so the treasurer would say…)

If you’re an average worker, your marginal tax rate4 is probably sitting somewhere around 30%, that is, you’ll be charged tax on this interest as income at a rate of 30c in the dollar. The government does not factor in the inflation and the fact that you’re losing buying power; they just want the most taxation income. So the balance looks something like;

  • $100,000 purchasing power start of year
  • $2,000 interest
  • -$600 income tax payable on your tax return
  • -$3000 maximum theoretical inflation

Total purchasing power after 12 months: $99,000, PLUS a $600 tax bill leaves you with $98,400.

cash is trash, piggy bank
Monetary policy is orchestrated to penalise savers; because savers are not great for an economy

So by sticking your money in the bank, you just made a negative return! A grant total of -1.6%. Clearly not a great idea for anyone in pursuit of Financial Independence. Even if you could secure an interest rate of 3%, due to the effect of income taxation you still end up losing out of almost $1000, which is a 1% negative return on real purchasing power! They don’t teach this at schools!

On the plus side, most governments have a savings deposit guarantee5 so even though you are losing money, you will know just how much money you will lose every year. In Australia, the federal government insures individuals for up to $250K worth of their savings – if the bank goes bust, you will still get back your savings (but only up to $250K). This isn’t really an issue, because if you wanted to spread out more cash investments I think you could just use multiple banks, each being federally insured for $250K, but for the reasons listed, you’d end up going backwards over time.

Monetary policy is orchestrated to penalise savers; because savers are not great for an economy – stuffing your cash in your knickers draw or under the mattress doesn’t really help anyone (especially yourself or your FI date!).

Clearly then those that are in the wealth accumulation stage prior to FI should try and minimise the cash drag on their portfolio. Excluding of course, a reasonably sized emergency fund.6 What is reasonable for one may not be so for another; this would all depend on your cost of living, family size, and the stability and inherent risk in your job. For example, when I was working as a professional pilot with no kids yet, I could afford to keep a much smaller emergency fund and direct all of the rest into stock market ETFs. Since retiring from flying, and now that I’m running a business of multiple content websites, I prefer to keep a larger emergency fund, closer to about $20k.

Spenders are drones

Spenders and consumers are good for the economy, as they stimulate business and production and ‘keep the machine oiled’. This makes profits for businesses, which employ people. The spenders are then locked into being workers too, in order to continue to pay for all the stuff they are buying – meaning the nation has a strong workforce. 

cash is trash, business man
If you don’t make smart money decisions and start making your money work for you, you might end up with this noose round your neck for longer than you would like.

The recipe for real long-term wealth generation is to earn more income, spend less of it and invest the difference in real assets. Over a long time period, this habit can easily make you a Millionaire (if you don’t believe me, have a read of the book The Millionaire next door’!). For example, some of the countries with the lowest percentages of consumer spending (and the highest level of household saving and investing) are:

  • Luxembourg
  • Switzerland
  • Sweden
  • Germany and;
  • The Netherlands.

These also happen to be some of the countries with the highest incomes, too (interesting correlation, or is it?).

The top 10 countries7 by consumer expenditure in 2016 were ranked as:

  • United States of America
  • European Union
  • China
  • Japan
  • Germany
  • UK
  • India
  • France
  • Italy
  • Brazil

This effect is magnified by the tool of ‘credit’ (a very useful but also dangerous concept invented by bankers). Some foolish people can end up in consumer debt or bad debt (that is, any debt for a liability rather than an asset class) which can ruin their life, or at best seriously delay them from reaching FI.

Investors are smart

If spenders are good for the economy, then investors are even better! When investors behave properly, they are rewarded handsomely as such! Of course, people are irrational and investors are people, therefore a lot of investors are irrational (and by the way, a smart investor like me can take advantage of this irrational behaviour by just continuing to buy stock market index ETF funds over time regardless of price).

When an investor starts investing their money into the right asset classes, they make the world a better place. Rather than hoarding their wealth like savers might by keeping money under their mattress (or the modern equivalent in an online savings account), a smart investor will be investing their money in productive businesses. They are allowing their capital to be used for innovation; human ingenuity and development.  

“Only buy something that you’d be perfectly happy to hold if the market shut down for 10 years.”

Warren buffet

Bank accounts

Ok back to bank accounts and cash. So even though you don’t want to have your capital sitting around as cash, you need a good savings buffer. I like to keep about a year’s worth of living expenses, which is about $20K. This is because I am pretty frugal and a very aggressive investor. I have the rest of my money invested in ETFs, and an investment property. (3.5% interest over a 30 year loan on a cash flow positive rental with good capital growth prospects).

Some people will need more cash than others due to having a larger family, owning their PPOR or by having a riskier or unsteady job. For homeowners or property investors, as explained earlier a convenient way to maximise your cash return on your emergency savings is to use an offset account8 on your mortgage: you still have access to the cash, but it is working much harder for you than it would in an online savings account. You probably still want a small emergency savings or ’Mojo’ account somewhere completely different just in case, and for quick access.

cash is trash, piggy bank
Even though you don’t want to have your capital sitting around as cash, you do need a good savings buffer, or Emergency Fund.

The best bank accounts

The best way to get a good account with no fees and a decent interest rate is to go with a discount online bank. By saving on overheads like offices and front-of-house customer service representatives, they can pass the savings on to you by charging little to no fees and giving you a decent rate.

In Australia, at the time of writing this, I think the following four are my top picks for an online bank; however the rates are changing frequently due to the RBA changing the cash rate. These banks provide good website and app interfaces, as well as a highly competitive rate amongst the other banks.

There are many other banks out there that offer a very short period of higher interest, but these quickly fizzle out and leave you with a paltry 1% or so. That is only going to assure you lose purchasing power through inflation and taxation! There are options for term deposits too, but I would steer clear of these as you don’t earn much more than these online savers, and your money is locked up and can’t be used in an emergency (so why wouldn’t you just buy ETFs with it instead?). These banks will give you these rates on a condition though; they want you to either use their transaction accounts, have your salary deposited into them or make a regular monthly contribution to your savings accounts.

This is actually not a problem, because their transaction accounts are the best ones I have found.

A neat little ‘hack’ if you don’t have a large enough income or if you can’t save as much as the threshold saving contribution, you can just juggle money between accounts on automated online transfers to get the higher interest. It literally takes 30 seconds to set up and is incredibly satisfying.

cash is trash, banks
The best way to get a good account with no fees and a decent interest rate is to go with a discount online bank.

Other ways to maximise interest

If you’re still looking for ways to maximise your earnings, have a look at starting a fee-free credit card. Making purchases on credit and paying them off on time means you’ll never pay interest on the credit, and your cash can be stashed away, earning interest. Even better it could be offsetting your mortgage or invested in ETFs. You can also get some ripper sign-up bonuses like points, frequent flyer miles or cashback and you don’t even have to keep the card – this is called credit card spoofing or hacking9 and it’s a fun hobby of mine.

“Credit card hacking can be worth it if you have the time, the organisation skills and you can control your credit card usage in a prudent way”.

Angel Zhong on

Final Words

In the current market of rising interest rates and rising inflation, it can be hard to know what to do with your cash. Regardless of your personal circumstances, we all need access to emergency savings but the amount you keep as well as where you keep it will be individual to you. It may be better to think about investing your money in real assets rather than keeping large amounts in bank accounts or in cash.

The best investments for you will depend on your savings buffer, your individual circumstances and your risk profile, as well as how long you want to be invested.

So, build up that emergency fund, do your own research on the best bank account for you and educate yourself on whether investing is for you, and whether your money is actually earning you more money, or not!

CaptainFI is not a Financial Advisor and the information below is factual review information, not financial advice. This website is reader-supported, which means we may be paid by advertising on the site, or when you visit links to partner or featured sites. For more information please read my Privacy PolicyTerms of Use, and Financial Disclaimer.

Reference List:

  1. ‘Purchase power is a measure of what your money can buy — here’s how it can impact your finances’, Louis DeNicola, Business Insider. Published (Updated): July 14, 2022. Accessed online at on Oct 11, 2022.
  2. ‘Cash Rate Methodology Overview’, RBA. Published (updated): Oct 26, 2021. Accessed online at on Oct 11, 2022.
  3. Inflation: What is it, How it can be controlled, and extreme examples’, Jason Fernando, Investopedia. Published (updated): Sep 13, 2022. Accessed online at Oct 11, 2022.
  4. ‘Individual income tax rates’, ATO. Accessed online at on Oct 11, 2022.
  5. ‘Financial Claims Scheme’, APRA (Australian Prudential Regulation Authority). Accessed online at on Oct 11, 2022.
  6. Save for an emergency fund’, Money Smart. Accessed online at on Oct 11, 2022.
  7. ‘List of largest consumer markets’, Wikipedia. Accessed online at on Oct 11, 2022.
  8. ‘Are you using your offset account wisely?’, Macquarie Bank. Accessed online at on Oct 11, 2022.
  9. ‘What is credit card hacking, and what are the risks?’, Rachel Rasker, Published: Sep 19, 2022. Accessed online at on Oct 11, 2022.
  10. ‘Why is Australia’s inflation rate so high?’, Jessica Mudditt, Published (updated): Sep 30, 2022. Accessed online at on Oct 11, 2022.
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