Singapore & Hong Kong Budget Planner

Most personal finance content focuses on stock picks, investment products, and complex tax strategies. Almost all of it is downstream of a simpler discipline: knowing where your money goes each month. Without a written budget, income leaks into subscriptions you forgot, fees you do not notice and lifestyle creep that climbs faster than salary. A rough monthly budget closes that leak, and the saving compounds for the whole of a working life. Budgeting is boring, repetitive, and the most leveraged financial habit there is.

50/30/20 — the rule that mostly works

The 50/30/20 framework was popularised by Elizabeth Warren, then a Harvard law professor, and Amelia Warren Tyagi in their 2005 book All Your Worth. The premise: divide your take-home income three ways — 50% to Needs (essentials you can't easily cut), 30% to Wants (lifestyle choices you could reduce), and 20% to Savings & Debt repayment beyond minimums. The numbers aren't precise — different financial situations call for different splits — but the structure forces you to categorise every expense, and the targets force you to confront overspending in any one category. For people earning median wages in major APAC cities, the rule is often aspirational rather than achievable (housing in Singapore, Hong Kong, Tokyo regularly exceeds 50% alone). The fix is to use the framework as a diagnostic — not a prescription. If Needs is at 65% of income, that's information: you're under-housed-flexibility-budget, you'll be slow to recover from any income shock, and you should treat 'lifestyle creep into Wants' as a serious risk.

The health check calls a category "on target" within five points of 50/30/20. Anything wider is flagged — over budget for Needs and Wants, below target for Savings & Debt. The rule was written for US households; treat it as a diagnostic, not a verdict.

The APAC household budget landscape

The rule assumes mandatory retirement saving happens before your net pay arrives, and in much of APAC it does — which is why this planner asks for net income. Singapore: CPF takes 37% of an employee's wage up to age 55 (20% from the employee, 17% from the employer) from 1 January 2026. Hong Kong: MPF takes 5% from employee and 5% from employer on relevant income between HK$7,100 and HK$30,000 a month. Australia: the superannuation guarantee is 12% of ordinary-time earnings from 1 July 2025, paid by the employer. None of that counts toward the 20% here; the 20% is what you set aside from take-home pay. In housing-heavy cities the Needs share will often sit above 50% before any optimisation — the framework is a diagnostic to be read against your own city, not a target imported from another one.

What this planner doesn't track (intentionally)

It doesn't connect to your bank. It doesn't auto-import transactions. It doesn't track every individual purchase. Those features come at a real cost — usually requiring you to give a third-party app access to your bank credentials, which crosses a security line many people aren't fully aware of. This tool is intentionally manual — you type the numbers, you see the categories, you make the decisions. The trade-off is that it doesn't keep itself up-to-date automatically; you need to come back and update each month. The benefit is that nothing about your finances ever leaves your laptop. For bank-connected automated tracking, look at YNAB, Mint, or the bank's own apps; just know what data you're sharing.