Lotto $10 Million Must Be Won: How It Works

Saturday night’s Lotto draw felt a little different. For the first time in weeks, the $10 million Powerball jackpot wasn’t going to roll over—it was guaranteed to go home with someone.

Guaranteed winner in must-be-won draws: 100% chance someone wins · Current must-be-won jackpot (New Zealand): $10 million · Odds of winning Lotto Powerball (standard): 1 in 38,000,000 · Number of must-be-won draws per year (approx.): 4–6 · Largest New Zealand Lotto jackpot won: $50 million (2020)

The following table summarizes key details from the draw.

What does “must be won” mean?

In the context of New Zealand Lotto, a “must be won” draw guarantees that the top prize is awarded in that specific draw. If nobody matches all six Lotto numbers plus the Powerball number, the jackpot doesn’t roll over to the next week. Instead, it “rolls down” and is split among winners at the next Powerball division.

“If there are no Powerball First Division winners, the jackpot would roll down to the next Powerball division and be split equally among winners.” — 1News, public-service broadcaster

RNZ reported that the mechanism kicks in automatically once the Powerball jackpot reaches $50 million. At that level, the prize cannot be rolled again, and the draw becomes mandatory-winner. For lower jackpots, Lotto NZ can also call a must-be-won draw at its discretion—as it did for the $10 million draw in September 2025.

How it contrasts with rollover systems

In standard rollover lotteries, if nobody wins the top prize, the jackpot carries over to the next draw and increases. This can produce huge headline numbers, as seen with the EuroMillions or US Powerball, but also means that a jackpot might go unclaimed for weeks. Must-be-won draws flip that logic: the prize is deliberately capped so it must be distributed.

The implication: the system ensures money leaves Lotto NZ’s hands within a predictable timeframe, creating certainty for players and operators alike.

How does a must-be-won draw work?

The mechanics are straightforward but carry a few nuances. Lotto NZ confirmed that in the September 13 draw, the $10 million jackpot “must be won, meaning if there are no Powerball First Division winners, the prize rolls down to the next division.” That’s the key sentence for anyone trying to understand the rule.

“When the jackpot reaches $50 million it cannot be rolled again and a must-be-won draw is called.” — RNZ, public radio network

What happens if no one matches the Powerball?

If a draw passes without a winning ticket that matches all six Lotto numbers plus the Powerball, the $10 million doesn’t vanish or hang around. It cascades to the next Powerball division where there is at least one winner, and those winners split the entire $10 million among them. This ensures the money leaves Lotto NZ’s hands in that draw period.

For the $55 million must-be-won draw later in 2025, 1News reported that the prize could be split between multiple ticket holders if nobody matched all six Lotto numbers plus the Powerball number. That same mechanism applied to the September draw, though in that case, a single ticket holder from Dunedin did match all numbers.

For players, the guarantee of distribution makes the draw a rare sure bet in the lottery world.

What happened in the $10 million must-be-won draw?

On Saturday, 13 September 2025, the draw took place as scheduled. The winning numbers were 40, 21, 34, 32, 14, 8, with a bonus ball of 25. A single ticket from Dunedin matched all numbers.

The New Zealand Herald confirmed that the ticket was sold on MyLotto, Lotto NZ’s online platform. The total prize the winner received came to $10.05 million, which broke down to $10,030,326 from Powerball and $20,835 from Lotto, as reported by the Otago Daily Times (Dunedin’s local newspaper).

In the same draw, five other Lotto players around New Zealand each won a $200,000 share of Lotto First Division—meaning the draw wasn’t solely about the one big winner.

Why the draw was called

Lotto NZ announced the must-be-won draw on 12 September 2025, citing final preparations for a major technology upgrade. The organization stated that the new system would begin operating from Monday, 29 September 2025, with the switch planned from 7pm Sunday, 28 September until later in the afternoon on Monday, 29 September. A must-be-won draw ahead of that upgrade cleared any outstanding jackpot liability before the transition, according to Scoop.

The implication: must-be-won draws don’t just happen at $50 million jackpots. Lotto NZ can schedule them operationally when convenient, and in this case, the $10 million cap was a clean number for a system cutover.

What are common mistakes lottery winners make?

A sudden windfall of $10 million can change a life, but it can also cause more problems than many winners anticipate. The stories of lottery winners who lost everything within a few years are not rare, and they share a pattern.

Rushing major financial decisions

Financial advisors in New Zealand consistently warn winners against making impulsive purchases immediately after claiming. The temptation to buy a new car, a house, or fund a relative’s business is strong. But advisors point out that winners who take time—often six months to a year—to let their new financial reality settle tend to make better decisions.

• One of the most common errors is telling too many people about the win, which can lead to requests for money from acquaintances and strangers alike.
• Signing the back of the ticket immediately after the draw is a critical step. An unsigned ticket is a negotiable instrument; if lost, anyone could claim it.

To avoid these pitfalls, follow this step-by-step plan immediately after a win:

1. Sign the back of the ticket.
2. Tell no one about the win until you have a professional team in place.
3. Assemble a team of financial and legal advisors who specialize in windfalls.
4. Avoid any major purchases or investments for at least six months.

Failing to assemble a trusted advisory team

Accountants, lawyers, and financial planners who specialize in managing large windfalls are the single most important investment a new winner can make. Without professional guidance, winners may find themselves facing tax complications they didn’t anticipate, even in New Zealand where lottery winnings are tax-free. The risk isn’t the tax authorities—it’s the people who will try to separate the winner from their money through poor investments or outright scams.

Lotto NZ itself advises winners to seek independent financial and legal advice before claiming the prize, but not every winner follows that recommendation.

The takeaway: professional advice is not a luxury—it is the single biggest determinant of long-term financial success after a lottery win.

What happened to the guy who won $2 billion dollars?

The largest single-ticket lottery jackpot in history was won by Edwin Castro of California, who claimed the $2.04 billion Powerball prize in November 2022. His story is both a cautionary tale and a case study in the risks of sudden extreme wealth.

Edwin Castro’s $2.04 billion Powerball win

Castro’s win shattered all previous records. The California Lottery confirmed that his ticket matched all five white balls plus the red Powerball. He took the lump sum cash option, which paid out approximately $997.6 million before federal taxes. The scale of the win made international headlines, and Castro himself became a public figure almost overnight, despite some efforts to stay low-key.

He reportedly purchased properties, including a home in the Hollywood Hills and another in the mountains. But the story that caught the most attention came later: according to 1News, he lost one of his three multi-million-dollar properties. The exact details vary by report, but the core lesson is the same: even with billions, bad real estate decisions and legal disputes can erode wealth.

The pattern: massive wealth without a disciplined strategy leads to rapid dissipation, regardless of the initial amount.

What happens if no one wins the 208m EuroMillions jackpot?

The EuroMillions lottery operates on a different principle from New Zealand’s must-be-won system. Its jackpot grows each time it goes unclaimed, until someone wins or it hits the cap.

EuroMillions rollover rules

In a rollover system, when no ticket matches all numbers, the jackpot amount is added to the next draw’s prize pool. This can continue for weeks or even months. The EuroMillions jackpot has a cap of €220 million (approximately NZ$395 million). If it reaches that cap in a draw and still no one wins at the top tier, the prize rolls down to the next winning tier—similar to a must-be-won distribution—but at a much higher threshold. The difference is structural: New Zealand forces a winner at a far lower dollar value.

There have been past EuroMillions draws where the jackpot rolled over many times, reaching headline-grabbing totals of €200 million or more. For a New Zealand Lotto player accustomed to the $10 million or $50 million must-be-won model, the EuroMillions system would feel like a waiting game rather than a guaranteed payout.

How must-be-won draws guarantee a winner

New Zealand Lotto’s must-be-won draw avoids the compound growth scenario entirely. By capping the jackpot at a predetermined level (typically $50 million for the mandatory trigger, but sometimes lower for operational draws like the $10 million one), Lotto NZ ensures that the prize pool cycles through to players within a predictable timeframe. This is part of the design philosophy: keep the lottery accessible, manageable, and less prone to the speculative frenzy that can build around huge rollovers.

The takeaway: the must-be-won model prioritizes distribution velocity over headline size.

How much tax do you pay on lottery winnings in New Zealand?

One of the most important financial questions for any lottery winner is what they get to keep. In New Zealand, the answer is straightforward: all of it.

New Zealand’s tax treatment of lottery winnings

Regarding lottery winnings, the answer is straightforward: all of it. The Inland Revenue Department’s policy is clear: gambling winnings, including lottery prizes, are not considered income for tax purposes. This means a Lotto winner pays zero tax on their prize. The $10 million the Dunedin winner receives is exactly $10 million, with no deduction for income tax, withholding tax, or capital gains tax. This distinguishes New Zealand from jurisdictions like the United States, where lottery winnings are subject to federal and state taxes that can reduce the headline figure by 30-50 percent.

However, winners should be aware that if they choose to invest their prize money—buying shares, property, or other assets—the returns on those investments are taxable under standard New Zealand income tax rules. The principal is tax free; the earnings it generates are not. For a deeper look at how income brackets work, see our guide on New Zealand Tax Rates 2025.

Lump sum vs. annuity choices

In New Zealand, Lotto pays out all prizes as a single lump sum. There is no annuity option akin to what some US state lotteries offer. This means a winner receives the full amount at once and must manage it themselves. For some, instant liquidity is an advantage. For others, it’s a risk—especially if they lack the financial literacy to handle a sudden seven-figure deposit.

Why is the EuroMillions so hard to win?

The EuroMillions lottery operates from a larger number pool and a more complex draw structure, making the odds of winning its jackpot significantly lower than New Zealand Powerball.

EuroMillions odds and number pool

The EuroMillions draw requires players to select five main numbers from a pool of 50, plus two Lucky Star numbers from a pool of 12. The probability of matching all seven numbers is 1 in 139,838,160—more than three and a half times harder than New Zealand Powerball’s odds of 1 in 38,000,000, as reported by RNZ. The difference is entirely statistical: more numbers, more combinations, fewer winners.

How must-be-won draws increase winning chances

While the base odds of winning a New Zealand Powerball jackpot are fixed at 1 in 38 million, the must-be-won mechanism changes the dynamic in a subtle but important way. In a standard rollover, if nobody wins, the jackpot persists and grows. In a must-be-won draw, if nobody wins the top tier, the prize simply redistributes downward. A player’s odds of winning the jackpot remain the same—1 in 38 million—but the odds of the prize pool being distributed in that draw become 100 percent. That guarantee of distribution is the structural advantage.

For someone in New Zealand considering whether to buy a ticket on a must-be-won night, the calculation is not about beating the odds. It’s about ensuring that if the money moves at all, it moves tonight.

If you’re thinking about how a windfall could be used for a major life goal, you might also be interested in how much it costs to build a house in NZ.

The $10 million must-be-won Powerball draw guarantees a winner, and our detailed must-be-won guide breaks down exactly what that means for players.

Frequently asked questions

For the Dunedin winner—or any future winner of a must-be-won draw—the advice from every financial professional who has watched past winners is the same: sign the ticket, call a lawyer, and don’t tell anyone until you have a plan. The $10 million is real, but keeping it depends entirely on what happens after the phone stops ringing.

For New Zealand Lottery players, the must-be-won mechanism offers a rare guarantee in a world of odds, caps, and rollovers. It won’t make you a statistician, but it does mean that on the right Saturday night, the prize money leaves Lotto NZ’s vaults and enters someone’s bank account. The choice, then, is simple: be the person who bought the ticket, or be the person who watches from the sideline and wonders.