How to Build a Retirement Budget That Actually Works

Here's an uncomfortable truth: most people spend more time planning their annual holiday than they do planning their retirement budget. They estimate they'll need "about 70% of their current income," hope for the best, and cross their fingers that everything will work out.

Then reality hits. Council rates climb faster than expected. The car needs replacing. A grandchild is born overseas, and you desperately want to visit. Suddenly, that comfortable retirement budget feels uncomfortably tight.

The good news? Building a retirement budget that actually reflects your life doesn't require a finance degree. It requires honesty about your spending patterns, understanding of New Zealand's retirement income landscape, and a framework that can flex as your needs change over potentially 30+ years.

One of the biggest mistakes in retirement budgeting is treating retirement as a single, unchanging phase. Research consistently shows that spending patterns shift significantly across retirement, typically falling into three distinct periods.

The Active Years (65-75): This phase often involves higher discretionary spending. You're healthy, energetic, and eager to tick items off your bucket list. Travel costs peak during these years. You might renovate the house, help adult children with home deposits, or invest in hobbies you've delayed for decades. Many Kiwis find they spend 90-100% of their pre-retirement income during this phase, sometimes even more.

The Settled Years (75-85): Spending typically moderates as travel becomes less frequent and energy levels shift. You've bought the caravan, completed the big trips, and settled into routines. However, home maintenance costs often rise as both you and your property age. Healthcare expenses start climbing, even with public system access. Spending often drops to 70-80% of the active phase.

The Care Years (85+): This phase sees spending patterns diverge dramatically based on health and living arrangements. If you remain independent at home, costs may stay moderate with increased spending on home help, meal delivery, and medical expenses. If residential care becomes necessary, costs can jump significantly, although the Residential Care Subsidy provides support for those who qualify after asset testing.

Your budget needs to anticipate all three phases. This means building flexibility into your withdrawal strategy and understanding that your first year of retirement spending won't predict your spending at 80.

Before you can project retirement spending, you need an honest picture of what you spend now. This isn't about judgment or guilt; it's about data. Spend at least three months (ideally six) tracking every dollar that leaves your account.

Break your spending into these categories specific to the New Zealand context:

• Housing: Mortgage/rent, rates, insurance, maintenance, body corporate fees
• Utilities: Power, water, internet, phone, streaming services
• Transport: Fuel, registration, WOF, insurance, maintenance, public transport
• Food: Groceries, dining out, coffee, takeaways
• Healthcare: GP visits, prescriptions, dental, specialists, health insurance
• Insurance: Home, contents, vehicle, life, income protection
• Personal: Clothing, grooming, gym, hobbies
• Discretionary: Travel, entertainment, gifts, donations
• Debt: Mortgage, personal loans, credit cards, hire purchase

Pay special attention to annual or irregular expenses that don't show up in monthly budgets: rates increases, insurance renewals, car registration, holiday costs, and gift-giving throughout the year. These "lumpy" expenses derail more budgets than daily spending ever does.

Before projecting expenses, you need to know what income you'll have to work with. For most New Zealanders, retirement income comes from three main sources.

NZ Super forms the foundation. As of April 2025, NZ Super pays $27,664 annually after tax for a single person living alone, or $42,370 combined for a couple (both receiving super). These amounts adjust annually based on wage growth and represent your guaranteed baseline income from age 65. Note that NZ Super is taxable income, and the figures above reflect net payments at the M tax code.

KiwiSaver and other savings provide your flexibility and comfort layer. The key question isn't just how much you've saved, but how you'll convert that lump sum into sustainable income. Drawing down 4% annually is a common starting point (meaning a $300,000 balance might provide $12,000 in year one), but your personal rate depends on your age, health, other income sources, and market conditions.

Part-time work or rental income bridges the gap for many Kiwis, particularly in early retirement. Around 30% of New Zealanders continue some form of paid work past 65, whether for financial necessity, social connection, or sense of purpose. If you own rental property, this income continues in retirement, though maintenance costs and periods between tenants need factoring into your budget.

Add these together to get your total annual retirement income, then subtract tax to understand your true spending power. Many retirees are surprised to find they pay less tax in retirement than during working years, even when KiwiSaver withdrawals are added to NZ Super, because overall income typically drops.

Some expenses disappear in retirement, others shrink, and a few quietly expand to fill the gap. Understanding these shifts helps create realistic projections.

What typically decreases or disappears:

• KiwiSaver contributions (no longer required after 65, though you can continue voluntarily)
• Commuting costs (fuel, parking, public transport if working from home)
• Work wardrobe and dry cleaning expenses
• Mortgage payments (if you've paid off your home by retirement)
• Life and income protection insurance (often no longer needed)
• Bought lunches and work coffees

What typically increases:

• Healthcare costs, particularly dental, optical, and specialists not fully covered publicly
• Rates and insurance (these climb regardless of your employment status)
• Travel and leisure, especially in early retirement
• Utilities if you're home more during the day
• Home maintenance as both you and your property age
• Gifts to children and grandchildren (often an underestimated expense)

What stays roughly the same:

• Groceries (though eating patterns may shift)
• Basic utilities like internet and phone
• Pet costs if you have animals
• Subscriptions and memberships you maintain

The net effect? Most financial planners suggest budgeting for 70-80% of your pre-retirement income, but this varies wildly based on whether you've paid off your mortgage, your health status, and your lifestyle expectations. A mortgage-free retiree with modest tastes might live comfortably on 60%, while someone renting or with ambitious travel plans might need 100% or more.

Now comes the detailed work. Take your current spending data and adjust category by category for retirement. Be specific and honest.

Essential expenses (housing, food, utilities, healthcare): Start with current costs, then add 2-3% annually for inflation. New Zealand's inflation rate has averaged around 2.2% over the past decade according to Stats NZ, though recent years have seen higher rates. For healthcare specifically, budget 3-4% annual increases, as medical costs typically rise faster than general inflation.

Discretionary expenses (travel, dining, entertainment): Be realistic about the lifestyle you want. If you've dreamed of visiting family overseas annually, price out actual flights and accommodation. If you plan to golf twice weekly, calculate membership fees, green fees, and equipment replacement. Vague estimates lead to budget failures.

One-off and irregular expenses: Build a separate category for these budget-busters. New car every 10 years? New heat pump every 15? Major dental work? Home repairs? Create a sinking fund by dividing the expected cost by the number of years until you'll need it, then budget that amount monthly.

The buffer factor: Here's where most budgets get it wrong. They account for known expenses but nothing else. Add a 10-15% buffer for unexpected costs, the things you cannot anticipate: the phone that dies, the funeral you need to attend in Australia, the wedding gift for a niece, the prescription not covered by your card. Life doesn't follow a spreadsheet.

For a practical example, a mortgage-free couple might budget: NZ Super ($42,370) + KiwiSaver drawdown ($15,000) = $57,370 total annual income. Essential expenses ($35,000) + discretionary ($15,000) + irregular/buffer ($7,000) = $57,000 total spending. This leaves a small surplus for additional savings or flexibility.

Your budget only works if your savings last. How you withdraw money from KiwiSaver and other investments directly impacts both your tax position and your long-term financial security.

The 4% rule (with New Zealand adjustments): The traditional approach suggests withdrawing 4% of your starting balance in year one, then adjusting that dollar amount for inflation each year. A $400,000 KiwiSaver balance would provide $16,000 in year one, $16,320 in year two (assuming 2% inflation), and so on. This strategy aims to make your money last 30 years, though it originated from US market data and may need adjusting for New Zealand's fee structures and different tax treatment.

The dynamic approach: Rather than inflating withdrawals every year regardless of market performance, some retirees adjust their withdrawal rate based on portfolio performance. If markets drop significantly, you might reduce discretionary spending temporarily rather than selling investments at a loss. This requires more active management but can extend portfolio longevity.

The bucket strategy: Divide your savings into three buckets: immediate cash (1-2 years of expenses), medium-term conservative investments (3-10 years), and long-term growth investments (10+ years). You spend from the cash bucket, periodically refilling it from the medium bucket, which in turn gets refilled from growth. This approach helps you avoid selling growth investments during market downturns.

Whatever strategy you choose, understand the tax implications. KiwiSaver withdrawals themselves aren't taxed (you've already paid tax on contributions), but any investment earnings within your KiwiSaver fund are taxed at your PIR (Prescribed Investor Rate). Outside KiwiSaver, investment income is taxable and could push you into a higher tax bracket if not planned carefully.

For detailed guidance on converting your KiwiSaver into retirement income, see our guide on how to use your KiwiSaver for retirement income.

A budget built on best-case assumptions crumbles when reality intervenes. Before you retire, test your budget against scenarios that could derail it.

Inflation surge: What happens if inflation runs at 5% for several years rather than 2-3%? Your NZ Super will adjust, but can your other income sources keep pace? Model a scenario where your costs rise faster than expected.

Market downturn in early retirement: Sequence-of-returns risk poses the biggest threat in your first decade of retirement. If markets crash early and you're forced to sell investments at a loss to fund spending, your portfolio may never recover. Test a scenario where your first five years see negative or flat returns. Could you reduce spending temporarily? Do you have enough cash buffer?

Unexpected health costs: Public healthcare covers much in New Zealand, but not everything. Dental work, mobility aids, home modifications, hearing aids, and some specialists require out-of-pocket payment. Model a scenario where you need $10,000-$15,000 for unexpected health expenses. Where would that money come from?

Supporting adult children: Many Kiwi retirees help children with home deposits, grandchild care costs, or temporary financial support. This generosity can undermine your own security if not budgeted. Model a scenario where you gift or loan $30,000-$50,000. How does this affect your long-term sustainability?

Living longer than expected: New Zealand life expectancy continues to climb. A 65-year-old couple today has a roughly 50% chance that one of them will live past 90. Model your budget to age 95 rather than 85. What changes?

If your budget fails these stress tests, you have time now to adjust: save more, plan to work longer, reduce expected spending, or reconsider the retirement age that makes sense for your situation.

A budget isn't a static document you create once and forget. Retirement lasts decades. Your needs, health, interests, and economic conditions will all shift. Regular reviews catch problems early, when they're still manageable.

Quarterly spending reviews: Every three months, compare actual spending to your budget. Don't wait for the annual review; by then, you might be $5,000 over budget with no clear understanding of where it went. Quarterly reviews reveal patterns: Are you consistently over in groceries? Is travel costing more than planned? Are healthcare expenses climbing faster than budgeted?

Annual comprehensive review: Once a year, revisit your entire financial picture. How did investments perform? Has your tax situation changed? Do you need to adjust your withdrawal rate? Are there new tax rule changes that affect you? This is also the time to recalculate your projected longevity budget using your current balance and spending rate.

Life-event reviews: Certain triggers demand immediate budget revision regardless of schedule: death of a spouse (your income and expenses both change significantly), major health diagnosis, decision to move house, inheritance received, or decision to help children financially. These events can reshape your entire financial picture.

Three-year strategic review: Every three years, step back and assess whether your overall retirement strategy still makes sense. Are you in a different retirement phase than when you started? Has your spending settled into patterns you didn't expect? Would you benefit from professional advice at this point?

The goal isn't perfection. Your budget will never predict every dollar perfectly. The goal is awareness and early correction. A budget that's 5% off and adjusted quarterly is far more valuable than a perfect budget that gets ignored until it's 30% off and causing stress.

Even careful planners fall into predictable traps. Knowing them helps you build around them.

Underestimating rates and insurance increases: These costs climb relentlessly and often faster than general inflation. Many councils have signaled rates increases of 5-7% annually in recent years. Don't assume your current rates bill will stay static; build in 4-5% annual increases.

Forgetting about replacing big-ticket items: Your car, appliances, roof, and heat pump all have expiration dates. A budget that doesn't account for eventual replacement will face crisis when the car dies and there's no plan to replace it. Create a replacement schedule and save accordingly.

Ignoring the gift-giving reality: Birthdays, Christmas, weddings, new grandchildren, the list grows. Many retirees spend $3,000-$5,000 annually on gifts without tracking it as a category. Make it explicit in your budget.

Assuming perfect health: Even with New Zealand's public health system, out-of-pocket health costs typically increase with age. GP co-payments, prescriptions not on the funded list, dental work, optical care, physiotherapy, these add up. Budget at least $2,000-$3,000 annually for health expenses, increasing as you age.

Being too conservative early: Some retirees save aggressively their whole life, then can't psychologically shift to spending in retirement. They die with large estates, having denied themselves experiences they could have afforded. Your budget should enable the life you want, not just minimize spending. If you can afford the trip, take it while you're healthy enough to enjoy it.

Being too optimistic about market returns: Assuming your investments will return 7-8% annually every year leads to overspending. Markets are volatile. Some years you'll earn 15%, others you'll lose 10%. Budget conservatively, assume modest returns (perhaps 4-5% after fees and inflation), and treat good years as bonuses rather than the new baseline.

This article is general information only and does not constitute personalised financial advice. For advice tailored to your situation, speak with a licensed Financial Advice Provider. You can find a registered adviser at fma.govt.nz.