Managing your money shouldn’t feel overwhelming. Whether you’re tracking everyday expenses, saving for a first home, or building an emergency fund, a simple plan gives you clarity and control. Use the free finance planner below to see exactly how much you have left over each month — then use the budgeting frameworks and tips underneath to put it to work. It’s general information, not financial advice.
The planner
Finance planner
Enter your income and typical expenses to see your monthly surplus and savings rate. Nothing is saved or sent anywhere — it all stays in your browser.
How to use it
It takes about a minute. First, enter your income — your main salary or wages plus any side income. Then enter your regular expenses — housing, food, transport, insurance, subscriptions, entertainment and anything else. The planner works out your cash flow: how much is left over each month, and what that is as a savings rate. Then set a savings goal and see whether your current spending leaves enough to hit it. If it doesn’t, you can see exactly how far off you are and adjust. Everything stays in your browser — there are no bank connections and no sign-up.
Simple budgeting frameworks
Simple budgeting frameworks
A rule of thumb gives you a starting point — adjust the percentages to fit your reality (especially if housing eats a big share).
The 50/30/20 rule
50% needs (rent, groceries, bills), 30% wants (entertainment, dining), 20% savings or debt repayment. The most popular starting point. On a $4,000 monthly income that’s $2,000 / $1,200 / $800.
The 75/15/10 variation
75% essentials, 15% savings/investing, 10% giving — a flexible alternative for people who prioritise charitable giving.
Pay yourself first
Set up an automatic transfer to savings on payday, before you spend on anything else. Aim for around 20% if you can; if that’s a stretch, start smaller and build up — consistency matters more than the exact number.
A daily-saving nudge
Saving about $27.40 a day reaches ~$10,000 in a year — a handy way to make a big goal feel concrete.
If your housing costs are high, keep tracking your spending and adjust the split — the framework is a guide, not a rule.
Putting your surplus to work
Once you know your monthly surplus, the next question is where it should go. A common order of priority: build a small emergency fund first (even $1,000 to start, then a few months’ expenses); contribute enough to KiwiSaver to capture your full employer match and the government contribution (essentially free money); pay down any high-interest debt (credit cards especially); and then build longer-term savings or investments toward your goals. If you’re saving toward a first home, our home loan calculator guide helps you work out a deposit target, and for your emergency fund, a high-interest savings account keeps it earning while staying accessible. For a deeper budgeting walkthrough, see our NZ budget planner guide.
The bottom line
The hardest part of managing money is starting — and a plan you’ll actually stick to beats a perfect one you abandon. Enter your numbers, find your surplus, pick a framework that fits, and automate your savings so it happens without willpower. Revisit it whenever your income or costs change. Small, consistent habits — capturing your KiwiSaver contributions, clearing expensive debt, saving a steady share each payday — compound into real financial security over time.
Disclaimer: This finance planner and article provide general budgeting information only, not personalised financial advice. The planner’s results are estimates based on the figures you enter. For advice tailored to your situation, consider a licensed financial adviser; you can find one through the Financial Markets Authority (FMA). Budgeting frameworks like the 50/30/20 rule are guidelines, not rules — adjust them to your circumstances.
Reference sources
- Sorted — free NZ budgeting tools and money guides: sorted.org.nz
- MoneyHub / Commission for Financial Capability — budgeting basics: sorted.org.nz guides
- Financial Markets Authority — finding a financial adviser: fma.govt.nz
Frequently asked questions
Is the finance planner free to use?
Yes — it’s completely free, with no sign-up or login. Just enter your figures and it calculates instantly. Nothing is saved or sent anywhere; it all stays in your browser.
Does it connect to my bank account?
No. You enter your own numbers, so there are no bank connections and no third-party data sharing — your information stays entirely in your control.
What is the 50/30/20 rule?
It’s a simple budgeting framework: 50% of your after-tax income for needs (rent, groceries, bills), 30% for wants (entertainment, dining out), and 20% for savings or debt repayment. It’s a great starting point — adjust the percentages if your housing costs are high.
How much of my income should I save?
A common target is around 20% of your income, but the right number depends on your situation. If 20% is a stretch, start smaller and increase it over time — the key is saving something consistently and automating it so it happens on payday before you spend.
How much rent can I afford?
A widely used guideline is no more than about 30% of your income on rent — so on $3,000 a month, roughly $900. In higher-cost cities this can be hard to stick to, in which case tracking the rest of your budget carefully matters even more.
Should I use a budgeting tool or hire a financial planner?
For everyday budgeting, a free tool like this is often all you need. A professional financial planner (typically a flat fee of around $1,000–$3,000, or $150–$400 an hour in NZ) is more useful when you have multiple goals, investments, or big life decisions — and you should check any adviser is registered with the FMA.
