So, if you're sitting on a ticket you haven't scanned and you're from the City of Sails, it might pay to check your numbers.
And while $19.1m is only half of what could have been won, it's still a hefty pay-packet which could be used to splurge out on a great number of things.
Sure, you could go on a massive spending spree with your earnings but why not invest it? Photo / Supplied
Or, you could be clever with your cash and invest it where you could earn hundreds of thousands of dollars each year.
A spokesperson for Westpac said they'd recommend seeking independent financial advice to ensure it was invested in ways to reflect your savings goals.
That would likely include consideration of a range of options with higher earning potential, such as managed funds.
But assuming you would qualify for the bonus rate every month, you could earn over $300,000 in after-tax interest, the spokesperson said.
"Putting the full amount in our Westpac Bonus Saver account would earn $180,334 in after-tax interest in the first year.
"Putting $19 million in a 12-month term deposit and the remaining $142,857 in a Westpac Bonus Saver account would earn $345,056 in after-tax interest in the first year."
Meanwhile, an approximate interest yield for accounts could earn you between $9000 and $250,000 each year with ANZ, a spokesperson said.
Through the serious saver 1.30 per cent savings account, one could earn a whopping $249,161.87 over 12 months.
An online account or private reserve with 0.05 per cent over 12 months, one could earn $9,528.22.
Elsewhere, approximate yields for a ANZ term deposit between one year and five years could earn you anywhere between $500,000 to $2m in interest.
• 1 Year @ 2.70% pa = $513,000; • 3 Year @ 2.60% pa = $1,482,000; • 5 Year @ 2.70% pa = $2,656,000.
