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50/30/20 Budget Calculator: Split Your Income Into Needs, Wants, and Savings

Our 50/30/20 Budget Calculator splits your after-tax income into needs, wants and savings so you can spend accordingly
Updated 1 June 2026
50/30/20 Budget Calculator in a Nutshell
The 50/30/20 budget is designed to separate your after-tax income into three buckets to prevent you from going into debt. After every payday, the theory is you allocate 50% for needs (such as food, housing costs, electricity etc), 30% on wants (meals out, tickets to sporting events, holidays etc) and 20% on savings and paying off non-housing debts (like credit cards and car finance etc). ​
50/30/20 Budget Calculator Instructions:
  1. Enter in your monthly income, after-tax and any deductions (student loan, KiwiSaver, ACC levy etc.) to find your 50/30/20 allocation.
  2. To manage your allocations, we suggest reading our Barefoot Investor New Zealand guide.

50/30/20 Budget Calculator

Split your after-tax income into needs, wants, and savings using the classic 50/30/20 framework. Adjust the split if it doesn't match your situation.

Your split
50% Needs
$3,250 per month
Per week $751 Per day $108
What counts: rent or mortgage, groceries, power, water, internet, fuel, insurance, minimum debt payments.
30% Wants
$1,950 per month
Per week $450 Per day $65
What counts: streaming subscriptions, dining out, takeaways, hobbies, holidays, gym, beauty, anything you could technically live without.
20% Savings & debt
$1,300 per month
Per week $300 Per day $43
What counts: emergency fund, investments outside KiwiSaver, extra mortgage repayments, credit card debt above the minimum, house deposit.

Understanding the 50/30/20 Budget

  • ​The 50/30/20 budget is a useful guideline to help you develop strong savings habits, but many people deviate from the exact percentages.
  • Our view is that 50/30/20 is more of a goal than an absolute rule.
  • Even if you allocate 10% of your take home pay to savings and debt repayment, the rewards can be significant.
  • The 50/30/20 budget is designed to stop you accumulating new debt (my having a 'wants' spending limit) and pay off the debts you have. 
What Happens When You Actually Track Where Your Money Goes?
  • We hear it constantly - MoneyHub readers who start using spending analytics find $100–$500+ in monthly waste they had no idea existed - forgotten subscriptions, bank fees, recurring charges that can easily be cancelled, the $10+ purchases that happen three times a week.
  • It's not that people spend recklessly – it's that they've never actually seen where the money goes.

This Is Why We're Big Fans of the Award-Winning Booster Savvy
  • Savvy solves two problems at once - your money earns 2.25% p.a. (reviewed monthly) while the built-in spending analytics show you exactly where it's going.
  • Traditional banks have no incentive to help you spend better – they profit from overdraft fees, credit card chaos, minimal interest, and your general disorganisation.
  • Savvy flips this. It's a transactional account with the returns of a savings account and the insights of a budgeting app – all in one place.

What makes Savvy worth considering:
  • Competitive Returns: Earn 2.25% p.a. on your entire balance - every cent earns a return from day one, calculated daily, paid monthly with no minimum balance required.
  • Instant Access, No Penalties: Withdraw anytime without sacrificing your return. This flexibility is rare for accounts paying meaningful returns.
  • No monthly account or card fees: Savvy is focused on making sure you earn returns.
  • Stacks: Divide your money into multiple purpose-built accounts – bills, savings goals, emergency fund – each earning the same rate. Automate your financial organisation.
  • Spending Insights: Real-time analytics show exactly where your money goes. We believe this is essential for anyone wanting to build better habits.
  • Automation Tools: Boost rounds up purchases and saves the difference. Sweep captures excess funds. Salary Split divides your pay before you can spend it. These are small actions that compound.
  • Full Transactional Functionality: Mastercard debit card (physical and digital), Apple Pay, Google Pay, automatic payments, and the ability to receive your salary directly.
  • Tax Efficiency: Structured as a PIE, taxed at your PIR (capped at 28%) – often more favourable than standard savings account tax treatment.

Know This: Booster is not a bank. Savvy is an investment in the Booster Savvy Fund, a cash-based managed fund. This means different protections apply compared to bank deposits – understand the distinction before opening an account.

Our View: Savvy works best for people who want their money to earn meaningful interest while maintaining full flexibility, and who value the behavioural tools that help build better financial habits. The spending insights alone help many users identify and eliminate wasteful expenses.

More Details: Our Booster Savvy Review explains everything in depth, or you can visit Savvy

Transparency: MoneyHub Founder Christopher Walsh is a Booster Savvy account holder and MoneyHub has a commercial relationship with Booster – this does not influence our analysis or editorial opinions.
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