You will be able to rebuild your budget after a raise, a move, a new partner or a drop in income.
In March, Wei Ling learns that her pay will go up from April. When that happens, the number at the top of her budget will be wrong.
A budget rests on a set of facts about your life: what you earn, where you live, who you share costs with, and what you owe. While those facts stay the same, the monthly close from lesson 7.1 keeps the budget accurate. Sooner or later one of them shifts. It might be a raise, a new flat, a partner, a baby, a job loss, or a parent who needs more help. Your categories then rest on the wrong numbers, and small adjustments at the monthly close will not catch up. When a big fact changes, rebuild the budget instead of patching it.
Some changes affect only one line. A new gym membership changes your subscriptions line and nothing else, so you edit that line and carry on. A change that moves the foundations alters the fixed costs or income the whole budget was built on, and it needs a rebuild.
Four kinds of change usually do this. A raise changes your take-home pay, which is the number at the top of every budget method in module 2. A move changes rent, utilities, transport and often groceries all at once. A new household member changes almost every needs line and how costs are shared, whether that's a partner, a flatmate, a child or a parent moving in. A drop in income changes what the whole plan can support.
To rebuild is to write a fresh budget from the new facts using your chosen method, instead of adjusting existing lines. Go back to the start of the budgeting process and work out your new take-home pay or new fixed costs. Write a fresh budget with your method. Then redo the sinking fund, debt and buffer lines if they no longer fit.
A raise is the easiest change to waste. If extra money arrives each month with no plan, it gets absorbed into daily life within weeks, and a year later you cannot point to where it went. The rule is to decide where a raise goes before it arrives and give every dollar of the increase a job.
Wei Ling's figures are example figures. After CPF, her take-home pay will rise by S$250 a month. She decides in March, before the raise lands, how to split it. S$150 goes to her buffer, and to her Japan fund once the buffer is full. S$100 goes to eating out and a little more shopping. Those are the two categories she values most, based on her ranking in lesson 4.1. S$150 plus S$100 is S$250, so the whole raise is allocated. Her new budget starts from S$4,050 instead of S$3,800, and the extra S$250 has a job before her first payslip shows it.
This works at any stage of a career. The full raise method, including how CPF affects what actually arrives, is in the course "Your first job: the money playbook", lesson 7.2, "The raise rule: decide where the next increase goes before it arrives". That course is aimed at a first job, but the method applies to every raise after it.
An income drop needs a rebuild in the other direction, and the order matters. Protect needs and debt minimums first. Then cut wants and any extra debt repayments until the budget fits. Missing a need or a minimum has lasting consequences: you can lose your room, pay late fees, or get a mark on your credit record. Trimming wants or extra repayments only slows things down for a while. A slower debt plan recovers, but a missed minimum leaves a trace on your record.
Farhan works in car sales on commission. When sales slow, his commission falls for three months running. His lowest normal month used to be S$3,400 and now looks closer to S$2,900 (these are also example figures). Lesson 7.2, "Read the gap between plan and actual", treats a sustained drop over several months as a change in the facts, not a one-off, and that is how Farhan treats it.
He rebuilds his budget from S$2,900. He protects rent, his family contribution, transport and his card minimums. He drops his card payments from S$600 to the minimums for now, cuts food outside home and shopping, and pauses adding to his buffer. The budget is tight but it balances, and nothing he is legally or contractually committed to is at risk. If even the minimums had been out of reach, his next step would have been an early call to the lender, as set out in lesson 5.3, "When you can't make a payment, talk to the lender early".
When income recovers, don't go straight back to the old budget. Once his commission recovers, Farhan waits for two normal months. Then he restores his card payments first and his wants after that.
Moving in with a partner or combining finances after marriage raises questions the numbers alone will not settle. Two examples are whether to keep joint or separate accounts, and how to split shared costs when one person earns more. The course "Money as a couple and a family" covers those. The practical rule is to work out your new share of the fixed costs once the household changes. Then write the budget again from that share, instead of editing the old one line by line.
Most of these changes come with some warning. Think about the year ahead and write down which of them could happen to you, and which budget lines each one would move.
List the life changes you expect in the next year and write the budget line each one would change.
Junxiong-WFG Organisation is an authorised representative of AIA Financial Advisers Private Limited (Reg. No. 201715016G).