Budget Calculator (Singapore) — 50/30/20

Allocate your take-home pay across needs, wants and savings using the 50/30/20 rule, applied after CPF in the Singapore context.

What you'll need

• Gross monthly income and age (for CPF)
• Fixed needs (housing, transport, food)
• Discretionary wants
• Savings and debt repayment targets

How it works

The 50/30/20 rule suggests 50% needs, 30% wants, 20% savings/debt. In Singapore, apply the ratios to take-home pay after CPF, since CPF is already pre-allocated savings.

Why after CPF? For Singapore Citizens and Permanent Residents (from the third year of PR status), employment income attracts mandatory CPF contributions. Below age 55, the employee contributes 20% of Ordinary Wages and the employer adds 17%, for a combined 37%. Contributions apply on Ordinary Wages up to the monthly ceiling of $8,000 (from 1 January 2026), with an annual salary ceiling of $102,000 covering bonuses and other Additional Wages. So someone earning $5,000 gross does not budget with $5,000 — the number that lands in the bank is $4,000, and that is the figure the 50/30/20 split works on.

Contribution rates step down with age, which means take-home pay rises even if gross salary stays flat: the employee share is 20% up to age 55, 16% from above 55 to 60, 12.5% from above 60 to 65, 9% from above 65 to 70, and 7.5% above 70. The employee share of your CPF is not "lost" money — for members under 35, contributions are allocated roughly 62% to the Ordinary Account, 16% to the Special Account and 22% to MediSave, earning at least 2.5% (OA) and 4% (SA/MA) interest. That is why the rule treats CPF as savings already set aside rather than an expense.

The three buckets are defined by necessity, not by merchant category. Needs are commitments you cannot easily pause: rent or mortgage instalments, utilities, basic groceries, transport to work, insurance premiums, childcare. Wants are discretionary: dining out, subscriptions, travel, hobbies. Savings/debt covers cash savings, investments, SRS top-ups and repayments beyond the minimum on any loans.

Current Singapore rules

Worked example — from gross salary to a full split

Say you are 30 years old (a Singapore Citizen) earning $5,000 gross a month, all Ordinary Wages. Step by step:

1. Check the ceiling. $5,000 is below the $8,000 monthly Ordinary Wage ceiling, so the full salary attracts CPF.
2. Deduct employee CPF. Under 55, the employee share is 20%: $5,000 × 20% = $1,000. (Your employer separately adds 17% = $850 on top; it never passes through your bank account.)
3. Take-home pay. $5,000 − $1,000 = $4,000.
4. Apply 50/30/20. Needs: $4,000 × 50% = $2,000. Wants: $4,000 × 30% = $1,200. Savings/debt: $4,000 × 20% = $800.

Counting the $1,000 employee CPF as forced savings, this person is actually setting aside $1,800 of $5,000 gross each month before the employer's contribution is even counted. Adjust the ratios to your situation — a heavy mortgage month may push needs past 50%, which usually means trimming the wants bucket rather than the savings one.

Common mistakes and good to know

• Applying the ratios to gross salary. Many people take 20% of $5,000 as their savings target when the rule is written for take-home pay. Either basis can work — but pick one and be consistent, or the buckets will not add up to what actually arrives in your account.
• Forgetting irregular annual costs. Insurance premiums paid yearly, road tax, income tax instalments and festive spending do not appear in a typical month. A common fix is to divide the annual total by 12 and park that amount inside "needs" each month.
• Classifying every recurring bill as a need. A subscription is recurring, but it is usually a want. The needs bucket is for commitments that are hard to pause, not simply anything on GIRO.
• Ignoring the age step-downs. Because employee CPF rates fall after 55, take-home pay rises at the same gross salary — the dollar amounts in each bucket change even though the percentages do not.
• Treating 50/30/20 as a fixed rule. It is a guideline. A household with dependants or a large housing loan may end up closer to a 60/20/20 split; the point is that the split is decided on purpose, not by leftover.
• Overlooking bonuses. Additional Wages (like bonuses) attract CPF up to the $102,000 annual salary ceiling less Ordinary Wages already subject to CPF — so a bonus also arrives net of the employee contribution where the ceiling has not been used up.

How the calculator helps

The PlanLiaoMah budget calculator models exactly the flow above: enter your gross monthly income and age, and it applies the 2026 CPF employee rate for your age band and the $8,000 Ordinary Wage ceiling to estimate take-home pay, then splits it 50/30/20. You can compare the suggested split against what you actually spend in each bucket, and the ratios stay visible so you can see how far your real numbers sit from the guideline. It runs entirely in your browser — no sign-up, and nothing you type is stored.

Important assumptions

• Employee CPF rate is 20% below age 55, on wages up to the $8,000 monthly ceiling
• Ratios are a starting guide, not a rule
• Bonuses/variable income simplified

Cases not fully modelled:

• Detailed expense categorisation
• Irregular annual costs
• Household-level pooling of income

Official sources and verification

• MoneySense (MAS) — national financial education programme
• CPF Board — How much CPF contributions to pay

Direct links to the relevant official pages. Rules and rates change; last checked 21 July 2026. Always confirm against the official source.

Frequently asked questions

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