The Singles Tax: Why Flying Solo Costs More Than You Think

Single-person households are the fastest-growing household type in New Zealand. The economics of going it alone are stacked against them, but not hopelessly so.

For many New Zealanders wondering whether it is actually more expensive to live alone, the short answer is yes. Roughly 14 percent more expensive overall, and far more when it comes to housing. This is the singles tax: not a line item on your IRD return, but a persistent surcharge on everyday life when there is nobody to split the bills with.

Being single is not a financial crime. But it can feel like one when you are covering rent by yourself, buying a $7 lettuce for an audience of one, and watching couples halve everything from broadband to Uber rides.

The numbers come from economist Shamubeel Eaqub, who crunched New Zealand household expenditure data and found working-age adults living alone spend roughly 14 percent more than their coupled counterparts, with housing costs 53 percent higher per person, health costs 40 percent higher, and communication expenses 41 percent higher. If your bank balance seems to evaporate faster than your flatmate-less existence would suggest, you are not imagining things.

Stats NZ projections show one-person households are the fastest-growing household type in the country, on track to reach nearly 600,000 by the late 2030s. People are marrying later, divorce remains common, and an ageing population means more New Zealanders live alone in later life, particularly women. Many others choose the single path deliberately, seeing independence as its own reward. Either way, the financial realities of solo living deserve a closer look.

What Exactly Is the "Singles Tax"?

The singles tax is not an official levy. It describes the higher per-person cost of living when there is nobody to share fixed expenses with. Economists have a formal framework for this: the OECD equivalence scale assigns a single adult a weighting of 1.0, but each additional adult in the household only adds 0.5. A couple does not need double the income of a single person to maintain the same standard of living. They need about 1.5 times. The second person gets a 50 percent discount on life, courtesy of shared rent, one internet connection, and a fridge running whether there is one person or two.

The UK Office for National Statistics uses the same framework and reaches the same conclusion: single-adult households need proportionally more income to achieve the same standard of living as multi-person households. This is not a New Zealand quirk. It is a structural feature of modern economies everywhere.

Where the Singles Tax Hits Hardest in New Zealand

Housing costs for single renters and owners. This is the big one. Consider a 38-year-old professional renting alone in Wellington on a salary of $95,000. A one-bedroom apartment in the central city might run $480 to $550 per week. A couple sharing a comparable two-bedroom at $650 per week each pays $325. The solo renter is spending 50 to 70 percent more for less space. Ownership is no different: mortgage repayments, rates, and insurance all fall on one set of shoulders instead of two. When you are renting or buying on a single income, the maths is simply less forgiving.

Groceries and household consumables. Bulk buying only works if someone eats the bulk. A single person buying a bag of salad, a loaf of bread, or a tray of chicken thighs often throws away what they cannot finish before it turns. Per-unit costs are lower in larger packs, but waste erodes the saving. You end up eating hummus for four consecutive dinners out of guilt, which, while character-building, is not ideal.

Insurance and financial products. Some insurers offer couples discounts on life and health cover. Travel insurance is often cheaper per person when purchased as a pair. Even car insurance can be marginally better for multi-policy households. The single person pays full freight across the board.

Retirement savings on one income. Here the gap widens considerably. Massey University's retirement expenditure guidelines show a single person living alone in a metropolitan centre needs about $687 per week for a no-frills lifestyle, while a couple spends just over $900, roughly $450 per person. As of the 2025/26 tax year, NZ Super pays a single person living alone about $538 per week after tax (M code), while each member of a qualifying couple receives about $413. The higher single rate helps, but it does not close the gap.

Research from Motu Economic and Public Policy Research found a third of all retired households are single people living alone, with singles more likely to be renting and less likely to hold insurance or savings. For anyone retirement planning on one income, the margin for error is thinner and the consequences of a financial shock are more severe.

Why Single Parents Pay a Double Penalty

Single parents face the singles tax and the cost of children simultaneously. Eaqub's data suggests single-parent households spend about 19 percent more per person than two-parent families. Government support mechanisms exist, including childcare subsidies and Working for Families tax credits, but they come with conditions and phase-outs that create perverse incentives.

A Treasury working paper found 30 percent of single-parent households face effective marginal tax rates above 50 percent as of the 2024/25 tax year. For a single parent earning the median wage and working between eight and 20 hours per week, increasing their hours could mean keeping as little as 10 cents of every additional dollar earned, once income tax and benefit abatement are factored in. The financial incentive to take on more work is, at best, modest.

How the Singles Tax Affects Men and Women Differently

The singles tax hits women disproportionately. Women are more likely to live alone, particularly in older age, and are more likely to have taken career breaks to raise children or care for family members. Those breaks compound over decades into lower KiwiSaver balances and reduced lifetime earnings. When the singles tax is layered on top, the financial pressure intensifies. If this resonates, our piece on wealth in women's hands explores the dynamics in more depth.

Men face a different set of challenges. Single men are less likely to access family-oriented subsidies and workplace flexibility, and may face societal expectations around spending on dating, socialising, and recreational purchases.

The Financial Advantages of Living Solo

Before this turns into a support group, it is worth acknowledging the real financial advantages of flying solo. For some people, they more than compensate for the higher per-person costs.

• ‍Complete financial autonomy. Want to put your entire bonus into a share portfolio instead of a new sofa? Done. No negotiations, no compromise, and absolutely no arguments about whether the family needs a second car. Your money reflects your priorities and nobody else's.‍
• Simpler budgeting. One income, one set of expenses, one person's spending habits to manage. Money is one of the leading causes of relationship conflict in New Zealand and everywhere else. Singles skip the drama entirely.‍
• Freedom to take calculated risks. Relocating to a cheaper city, house-hacking with flatmates, pivoting careers, or investing aggressively in your 30s are all decisions easier to make when nobody else depends on your income staying stable next month.‍
• Lower exposure to lifestyle creep. Couples often ratchet up spending to match combined earnings: the nicer suburb, the bigger car, the more expensive holidays. A single person's lifestyle tends to scale with their own ambitions rather than a joint standard of living they never explicitly agreed to.

How to Reduce the Singles Tax on Your Finances

You cannot legislate away the economics of shared housing and split bills. But you can make deliberate decisions to narrow the gap.

1. ‍Adjust your budgeting framework. The popular 50/30/20 rule (50 percent on needs, 30 percent on wants, 20 percent on savings) assumes your fixed costs are roughly half your take-home pay. For many single earners, housing alone can consume 35 to 40 percent of net income before utilities, insurance, and groceries. A more realistic starting point for solo earners is 60/20/20: 60 percent on needs, 20 percent on wants, 20 percent on savings and debt repayment. The savings target stays the same. The adjustment simply acknowledges the structural cost premium and stops you from feeling like a failure every time housing eats your budget.‍
2. Share housing costs without sharing your life. Flatting is the most direct solution. A professional sharing a three-bedroom house with two others in an Auckland suburb might pay $280 per week instead of $500 for a studio alone. Co-living arrangements are growing in popularity and are not limited to people in their twenties. If you value your own space, consider a property with a minor dwelling or granny flat and offset your mortgage with rental income.‍
3. Automate your savings ruthlessly. Without a partner's income as a safety net, your savings rate matters more. Set up automatic transfers to your KiwiSaver, a dedicated emergency fund, and a separate investment account. The money moves before you see it, which is the point.‍
4. Insure what a partner's income would cover. In a couple, one person's income can keep the household running if the other falls ill or loses their job. Solo, you have no backup. Income protection insurance and adequate health cover are structural necessities for single-income households, not optional extras.‍
5. Negotiate harder and switch more often. You will not get a couples discount, but loyalty benefits, bundled packages, and provider switching are all available. Power companies, insurers, and telcos compete for customers. A 20-minute phone call or comparison-site visit can save hundreds per year.

New Zealand vs. the Rest of the World: How Our Settings Compare

New Zealand’s singles tax isn’t unusual by global standards, but our policy settings magnify its impact. Unlike Australia, which shields the first A$18,200 of income from tax, New Zealand taxes people from the first dollar earned. There is no tax‑free threshold and no recognition that living costs do not halve just because you live alone.

Other countries at least soften that reality through the tax system. In the United States, for example, married couples can file jointly, doubling tax brackets and the standard deduction and often paying less tax than two single earners on the same combined income. The system explicitly treats a household as an economic unit. New Zealand does not. Inland Revenue makes no distinction between single and partnered taxpayers, meaning two people sharing housing and bills are taxed exactly the same as two people maintaining separate households.

There are bright spots. KiwiSaver is structured around individual accounts, which means singles are not penalised in retirement savings. And the absence of a comprehensive capital gains tax means a single person who accumulates wealth through long‑term investment keeps the same share of gains as anyone else.

But on day‑to‑day costs, the burden falls squarely on the individual. Across the OECD, housing, power, insurance and transport costs simply do not scale in proportion to household size. In countries with larger housing subsidies or deeper social safety nets, that gap is softened. In New Zealand, with high housing costs and relatively modest support, it isn’t. The result is a quiet premium paid by people who live alone, not baked into one policy, but into the way all our systems fit together.

Turning New Zealand's Singles Tax Into a Financial Advantage

The singles tax is real, measurable, and unlikely to disappear. But it is also manageable. The people who handle it best recognise the structural cost premium, make deliberate financial decisions to offset it, and channel the genuine advantages of autonomy into long-term wealth building.

You are the sole decision-maker of your financial life. No one else is going to fund your retirement, build your emergency reserves, or make sure your insurance is fit for purpose. Accept the cost premium, exploit the freedom, and build something worth having.

This is where generic rules of thumb tend to fall down. Financial planning designed around a single income, a single set of goals, and one person's risk tolerance looks fundamentally different from a joint plan, and it should. If you are building wealth on your own terms and want a professional sounding board, get in touch. We work with New Zealanders across every life stage and relationship status, and some of the most focused wealth builders we advise are flying solo.