Financial Red Flags to Watch Out For in Your Partner

These eight warning signs could cost you more than just a relationship.

Most people start thinking about a partner’s financial habits at a specific moment: moving in together, applying for a mortgage, or opening a joint account. By then, the red flags may have been flying for months.

Money is the topic most couples would rather avoid and the one most likely to end a relationship. A study by the Institute for Divorce Financial Analysts found money issues were the third leading contributor to divorce, behind general incompatibility and infidelity.

In New Zealand, the financial stakes of a relationship are codified in law. Under the Property (Relationships) Act 1976, relationship property is generally divided 50/50 when a qualifying relationship ends. Once you have been living together for three years, your partner’s financial decisions become your problem whether you knew about them or not.

NZ-specific data on financial infidelity is limited. Internationally, a 2026 Bankrate survey of more than 2,500 US adults found 43% believe keeping financial secrets is at least as damaging as physical cheating, and nearly one in ten people in committed relationships are hiding major debts, expenses, or income from their partner. Younger generations are worse: 67% of Gen Z respondents admitted to at least one form of financial deception.

Closer to home, the picture is consistent. The Retirement Commission’s financial sentiment tracker found 62% of New Zealand women reported feeling financially uncomfortable in the year to June 2025, compared with 51% of men. When people feel stressed about money, they are more likely to hide the truth from a partner.

Financial red flags are not always dramatic. Some are subtle: a reluctance to discuss money, a habit of letting you pick up the bill, a vague answer about an obvious debt. They might not end a relationship on their own, but left unaddressed they tend to compound. The earlier you spot them, the better positioned you are to protect yourself.

What Financial Compatibility Actually Means

Financial compatibility does not require identical incomes, spending habits, or risk tolerance. It means you and your partner can communicate openly about money, make joint decisions without resentment, and work toward shared financial goals.

Research by Northeastern University behavioural scientist Hristina Nikolova found something counterintuitive: couples where both partners admitted to hiding spending from each other reported higher relationship satisfaction than couples where only one partner was deceptive. The reason? Alignment.

When both people operate under the same unspoken rules, they feel like they are on the same page. When only one person is hiding something, the resulting gap between financial goals corrodes trust. The deception matters more than the amount.

In New Zealand, financial alignment carries a legal dimension most couples underestimate. Relationship property includes the family home, its contents, and assets acquired during the relationship. It also includes KiwiSaver™ Scheme contributions made during the relationship. If your partner has been racking up debt or draining savings without your knowledge, you may not discover the damage until separation.

Compatibility is not about finding someone who manages money the way you do. It is about finding someone willing to be honest about how they manage it.

Eight Financial Red Flags

1. The Secret Keeper

Financial infidelity does not involve love affairs. It involves concealed bank accounts, downplayed debts, unexplained purchases, and conversations about money deflected with “it’s fine” or “don’t worry about it.”

The scale of this is significant. A 2026 Bankrate survey found nearly half of Americans in committed relationships admit they do not know everything about their partner’s finances. One in two acknowledged at least one act of financial deception, from lying about a purchase to maintaining a secret credit card.

There is an important distinction between privacy and secrecy. Choosing not to itemise every coffee purchase is privacy. Hiding a $30,000 credit card balance is deception. The line sits wherever the hidden information would materially change how the other person views the relationship or makes their own financial decisions.

In practice, advisers often see hidden debt surface at mortgage pre-approval, when options are already limited. A couple arrives confident they can borrow what they need. Then the bank runs a credit check on both applicants. An undisclosed personal loan or maxed-out credit card changes the debt-to-income calculation, and the borrowing capacity drops. By the time the secret is out, the house they wanted is no longer in reach.

It is worth noting the legal distinction here. Under the Property (Relationships) Act, personal debts incurred outside the relationship generally remain the debtor’s responsibility. But relationship debts, those incurred for the benefit of both partners or the household, are treated as shared. The practical problem is the grey area between the two, and the damage hidden debt does to joint financial goals regardless of who technically owes it.

If your partner becomes evasive when money comes up, pay attention. Awkwardness is normal. Evasion is not.

2. The Controller

Financial control is one of the most insidious red flags because it often presents as care. “I’ll handle the money so you don’t have to worry” can sound generous. But when one partner monopolises all financial decisions, restricts the other’s access to accounts, or demands an accounting of every dollar spent, it is not generosity. It is control.

New Zealand research confirms this is widespread. According to a University of Auckland study cited by the Ministry for Women, approximately one in seven women (15%) who have been in a relationship have experienced economic abuse. Among Māori women, the prevalence rises to 22%.

A comparison of surveys from 2003 and 2019 found the lifetime rate of economic abuse doubled over the period.

Economic abuse can include withholding access to bank accounts, forbidding a partner from working, taking control of their wages, or sabotaging their credit rating by intentionally missing payments on joint accounts.

A 2024 New Zealand survey by Good Shepherd found the most prevalent form of economic harm was withholding or hiding financial information (17.6%), followed by intentionally paying bills late or not paying bills in the other person’s name (17%). Banks in both New Zealand and Australia have started explicitly naming economic harm as a breach of customer terms and conditions.

Under New Zealand’s Family Violence Act 2018, economic harm is classified as a subset of psychological abuse. Family violence agencies and financial organisations have called for it to be recognised as a standalone offence, in line with the UK and Australia, where coercive control laws now criminalise non-physical patterns of abuse.

Regardless of the legal classification, the pattern is clear: if your partner controls all the money and you cannot explain your household’s financial position to a trusted friend, something is wrong.

If you or someone you know is experiencing financial abuse, free and confidential support is available from the New Zealand Government’s financial abuse resources.

3. The Flaunter

A partner who leads with their wallet on a first date is telling you something, and it is rarely about confidence. Conspicuous spending in the early stages of a relationship often signals insecurity, poor financial boundaries, or a spending pattern not built to last.

UK research by MoneySuperMarket found 52% of respondents considered someone trying to appear wealthier than they are to be a major red flag. Social media has amplified the tendency: studies suggest one in five people have lied to a partner about a purchase influenced by Instagram or TikTok.

The question is not whether your partner earns a lot or a little. It is whether their spending reflects their actual financial position. Someone living authentically within their means is a far better prospect than someone performing wealth they do not have.

4. The Perpetual Guest

Your partner conveniently forgets their wallet. They suggest dinner at a nice restaurant but expect you to cover it. They agreed to split a purchase months ago but have never paid their half.

A one-off is nothing. A pattern is a signal. The issue is not frugality; frugality involves spending carefully on yourself. This involves spending freely on someone else’s dime. Someone who lets you pick up every dinner bill will, given enough time, let you carry the mortgage.

5. The Chronic Borrower

Everyone encounters a rough patch. Needing help is not a red flag. Needing help perpetually is.

A partner who regularly borrows from friends, family, or you is demonstrating either an inability to manage cash flow or a comfort with financial dependence. Watch how those relationships are managed. Families who routinely bail someone out are enabling the behaviour, not solving it.

In a de facto relationship of three years or more, New Zealand law treats relationship property as jointly owned. If your partner has a pattern of running up debt, part of the cost of cleaning up may fall on you.

6. The Risk Taker

Calculated risk is a fundamental part of building wealth. Speculating on cryptocurrency tips from TikTok, day-trading a joint savings account, or spending weekends at the casino is not calculated risk. It is gambling.

The distinction matters. A partner who invests thoughtfully and accepts short-term volatility for long-term growth is behaving rationally. A partner who chases returns based on hunches, hype, or adrenaline is behaving compulsively. According to one US study, 15% of people have spent money on gambling or risky investments without telling their partner, with the rate among millennials reaching 21%.

When couples start investing together, having a clear framework matters. Sound investment management begins with understanding risk tolerance, time horizon, and goals. If your partner cannot articulate why they are taking a financial risk, or gets defensive when you ask, treat it as a warning sign.

7. The Present-Focused Partner

Some people are genuinely spontaneous. Others are avoidant. The difference shows up in whether they have any financial plan at all.

A partner who does not budget, has no savings, contributes nothing to their KiwiSaver™ Scheme beyond the minimum, and has never thought about retirement is not living in the moment. They are outsourcing their future to someone else, most likely you.

This becomes a sharper issue in New Zealand than in many countries. NZ Superannuation provides a modest safety net, but it is not designed to maintain a comfortable lifestyle on its own. Couples who want to maintain their standard of living in retirement need to plan and invest during their earning years.

If one partner refuses to engage with this reality, the other carries the full weight of retirement planning for both of them. You do not need a partner with a detailed five-year forecast. But you do need someone who can answer the question, “What are we working toward?”

8. The Debt Collector

Debt is not inherently bad. A mortgage, a student loan, a car loan with manageable repayments: these are tools. The red flag is not the existence of debt but the trajectory.

A partner actively paying down debt according to a plan is demonstrating discipline. A partner accumulating debt with no plan to address it, missing repayments, and opening new credit facilities to service old ones, is heading for trouble.

Multiple missed payments damage credit scores, and in New Zealand your credit rating directly affects your ability to secure a mortgage, a personal loan, or in some cases even a rental property. If you are planning to buy a home together, your partner’s debt-to-income ratio will be assessed alongside yours. Their undisclosed credit card balance becomes your mortgage rejection.

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What to Do About It

Red flags are not automatic dealbreakers. Some can be addressed. Others cannot. The difference usually comes down to whether your partner acknowledges the problem and is willing to change.

Start with a conversation, not a confrontation. Choose a calm moment. Frame the discussion around shared goals rather than accusations. Questions like “How do you feel about our emergency savings?” or “What would we need to change to be ready to buy a place in two years?” open the door without putting someone on trial.

Assess whether the behaviour is a pattern or an incident. A one-off overspend after a bad week is different from systematic concealment. Patterns are harder to change because they are often rooted in shame, avoidance, or a deep discomfort with financial transparency.

Get professional input if the conversation stalls. A couples therapist can help if communication is the barrier. A financial adviser can help if the issue is practical: unmanageable debt, no savings, or conflicting risk tolerances. Sometimes a neutral third party makes it possible to discuss things both of you have been avoiding.

Know where the line is. If your partner will not engage, will not disclose, or will not change, you have to weigh what staying costs you. Not just emotionally, but financially. Under New Zealand’s relationship property rules, you may be sharing the consequences of your partner’s financial decisions whether you knew about them or not.

Protecting Your Own Position

Regardless of how solid your relationship feels, financial self-awareness is non-negotiable. You should know your household’s income, debts, and assets. You should have access to all joint accounts. You should understand what would happen financially if the relationship ended tomorrow.

• Maintain your own financial identity. Keep at least one bank account and one credit facility in your own name. This protects your credit history and provides a safety net if circumstances change.
• Understand your KiwiSaver™ Scheme position. Both partners should know their current balance, contribution rate, and fund type. KiwiSaver™ balances accumulated during the relationship are relationship property and may be divided if the relationship ends.
• Consider a contracting-out agreement. If one partner has significantly more assets or debt entering the relationship, a relationship property agreement can clarify how property would be divided. Both parties need independent legal advice for the agreement to be valid.
• Check your credit report. Review your own credit file annually and be aware of any joint liabilities.
• Talk about money regularly. Set a recurring time to review your finances together. It does not need to be long or formal, but it needs to happen. Couples who talk about money regularly are far less likely to be blindsided.

The Bottom Line

Financial compatibility is not about finding a partner who earns enough or manages money perfectly. It is about transparency, shared responsibility, and a willingness to face hard conversations together.

Red flags exist on a spectrum. A partner who is open about a messy financial past and working to improve it is very different from one who hides, deflects, or blames. What matters is direction, not starting position.

The strongest financial position you can be in, whether you are in a relationship or not, is one where you understand your own finances, can articulate your goals, and have the confidence to make informed decisions. No partner, however wonderful, is a substitute for your own financial literacy.