How to prepare a budget for investing in ASX shares

Here's how to prepare a budget to help you invest in ASX shares.

| More on:
a woman

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

In a recent series of articles I looked at how to prepare for a recession whilst investing in ASX shares. A key component of this was working out and understanding your cash flow needs. In other words, preparing a budget. Preparing a budget is important in the good times and even more so in the tough times.

How to make a budget

Preparing a budget can be as simple or complex as you want to make it. There are some great templates and calculators out there if you want to keep it simple. But when investing in ASX shares, there are a few more factors to consider.

Make sure that you factor the following into your budget: needs vs wants; emergency fund deposits; annual expenses; and amounts for saving and investing.

Opportunity cost

A key concept when preparing a budget for ASX investing is opportunity cost. A dollar spent on a consumable item like coffee is gone forever. However, it may not just be a dollar. If that dollar was able to be invested in ASX stocks and earn a 10% return, it would be worth double in 7.2 years.

It could be worth even more if invested in market beating companies like Altium Limited (ASX: ALU) or CSL Limited (ASX: CSL).

This isn't the only way that each dollar can be different. A dollar saved is worth more than a dollar earned. Why? Because of the tax man. If your taxable income is more than $180,000, you are on the top marginal tax rate of 47% (including the Medicare Levy). Saving $1,000 is the equivalent of earning $1,887 before tax.  

Margin of safety

Everyone will at a minimum know someone who has seen their income impacted by COVID-19. This is a great example of why you need to have a margin of safety built into your budget. A margin of safety is a buffer of how much your income can drop before you "break even" on your necessary spending.

Although COVID-19 is a black swan event, there are many instances where you may see a spike in expenses or drop in income. Your employer could go bankrupt, a family member could have a health issue or you may want to change career.

A margin of safety will allow you to hold your stocks through an unforeseen event, ensuring that you don't miss out on the handful of amazing days that generate most of the stock markets returns. If you were forced to sell Afterpay Ltd (ASX: APT) at the bottom on 23 March, you would have missed out on the 147% rebound through to Easter.

A margin of safety is even more important where you have collateralised debt (such as a mortgage) or any high interest or high penalty amounts owing. Keeping your house and avoiding unnecessary costs can be critical to preserving your wealth in a recession.

Lloyd Prout owns shares in Altium Limited and expresses his own opinions. The Motley Fool Australia's parent company Motley Fool Holdings Inc. owns shares of CSL Ltd. The Motley Fool Australia owns shares of Altium. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

More on How to invest

Happy young couple saving money in piggy bank.
How to invest

3 steps to build an ASX passive income machine in 2025

Put your money to work for you with these easy steps.

Read more »

How to invest

Here's how an ASX investor might aim to turn $20,000 into $2,000 per month of passive income

If you are sitting on $20,000 then it could be worth putting it to work in the share market. Especially…

Read more »

A young well-dressed couple at a luxury resort celebrate successful life choices.
How to invest

No savings at 50? I'd use Warren Buffett's methods to get rich and retire early

This simple strategy could be key to retiring rich even if starting late in life.

Read more »

Happy young couple saving money in piggy bank.
How to invest

How I'd build a winning portfolio by investing in top ASX shares now

Let's see what steps you could take to build a winning portfolio.

Read more »

Happy young couple doing road trip in tropical city.
How to invest

How to make $50,000 passive income a year from ASX shares

Here is how you can generate income each year without lifting a finger.

Read more »

Happy young woman saving money in a piggy bank.
How to invest

$20k invested in these ASX 200 shares 10 years ago is worth…

Let's see how these stocks have performed since back in 2014.

Read more »

A young well-dressed couple at a luxury resort celebrate successful life choices.
How to invest

How to build a million-dollar portfolio with ASX shares

These are the steps to take to build a seven-figure investment portfolio.

Read more »

Hands reaching high for a trophy with a sunset in the background.
How to invest

I'm taking Warren Buffett's advice for when ASX shares are at record highs

Would the Oracle of Omaha continue to buy shares when the market is at a record high?

Read more »