Monthly Budget Simulator (VND)
If you live and work in Vietnam, your money flows in Vietnamese dong — salary in the tens of millions, rent and groceries paid locally, and a savings or repatriation goal in the background. A budget is simply the map of where that money goes each month. This tool lets you list every income line (salary, side income, allowances) and every expense line (rent, food, transport, utilities, leisure), then instantly returns the three numbers that matter: total income, total expenses and your monthly surplus — what is left to save or invest.
A worked expat scenario makes it concrete. With a take-home salary of 40.000.000 VND and the rent-heavy expense structure typical for foreigners in Hanoi or Ho Chi Minh City — 27.000.000 VND in total — the surplus comes to 13.000.000 VND per month and the savings rate is 32.5%. The savings rate (surplus divided by income) is the single most useful health metric: it does not care how much you earn, only how wide the gap is between earning and spending.
Two things tend to surprise newcomers. First, rent dominates an expat budget: in this example it is 12.000.000 VND, or 44.4% of all spending and 30.0% of income — far above the rule-of-thumb ceiling, so it is the first lever to examine. Second, everything here is nominal VND; if you eventually convert savings to another currency, the exchange rate matters as much as the surplus. Every figure on this page is an illustrative scenario — replace it with your real numbers to get a picture that fits your life.
How the simulator computes your budget
Four core metrics
Every line you enter is tagged as either income or expense. From those, the tool computes:
| Metric | Formula |
|---|---|
| Total income | sum of all income lines |
| Total expenses | sum of all expense lines |
| Surplus (deficit) | Total income − Total expenses |
| Savings rate | Surplus ÷ Total income × 100% |
When expenses exceed income the surplus is negative — a deficit — and the tool flags it. If total income is zero, the savings rate is defined as 0% to avoid dividing by zero.
Spending breakdown
For each expense, the tool computes its share of total expenses (not of income): percentage = that line ÷ total expenses × 100%, sorted largest first. This is the fastest way to spot the line that is really driving your spending.
The 50/30/20 benchmark
A widely used framework splits after-tax income into 50% needs (housing, food, transport, bills), 30% wants (leisure, shopping, travel) and 20% savings/debt repayment. On 40.000.000 VND of income that maps to 20.000.000 / 12.000.000 / 8.000.000 VND. Treat this as an illustrative assumption, not a rule — for expats, rent alone often pushes "needs" past 50%, which is exactly why the breakdown above is worth watching. FiMo has a dedicated 50/30/20 tool to test the split.
What the model leaves out
The simulator models one typical month and assumes recurring amounts. Irregular costs — annual insurance, visa renewals, flights home, a deposit on a new apartment — should be averaged into a monthly figure; FiMo's sinking-fund tool helps spread them. The tool does not compute Vietnamese personal income tax or social insurance, so enter your take-home pay (after tax and insurance) for the savings rate to be meaningful.
Worked example: a 40.000.000 VND/month expat budget
Illustrative assumptions — a single professional on a take-home salary of 40.000.000 VND/month, with this fixed monthly spending:
| Line | Type | Amount (VND) | % of expenses |
|---|---|---|---|
| Salary | Income | 40.000.000 | — |
| Rent | Expense | 12.000.000 | 44.4% |
| Food | Expense | 6.000.000 | 22.2% |
| Leisure | Expense | 4.000.000 | 14.8% |
| Transport | Expense | 3.000.000 | 11.1% |
| Utilities | Expense | 2.000.000 | 7.4% |
| Total expenses | 27.000.000 | 100% |
What the tool returns:
| Metric | Value |
|---|---|
| Total income | 40.000.000 VND |
| Total expenses | 27.000.000 VND |
| Monthly surplus | 13.000.000 VND |
| Savings rate | 32.5% |
How to read it: expenses of 27.000.000 VND consume 67.5% of income, leaving a surplus of 13.000.000 VND — a 32.5% savings rate, above the 20% benchmark but with limited margin. Sustained for a year that is 156.000.000 VND toward savings, an emergency fund or investments.
The largest line is rent at 12.000.000 VND — 44.4% of spending. Because it is so dominant, negotiating rent or moving one district out usually moves the savings rate far more than trimming the utilities line. Drop your own figures into the tool, then use FiMo's savings-rate calculator to see how your 32.5% compares with where you want to be.
Frequently asked questions
What is a savings rate and how is it calculated?
Your savings rate = surplus ÷ total income × 100%, where surplus = total income − total expenses. In the worked expat example (income 40.000.000 VND, expenses 27.000.000 VND): the surplus is 13.000.000 VND and the savings rate is 32.5%. It is the best single health metric because it measures the gap between earning and spending, regardless of the absolute income.
Should I enter gross or net income?
Enter your take-home (net) pay — the amount that actually lands in your account after Vietnamese personal income tax and any social insurance. The simulator does not compute tax, so entering gross salary would inflate your savings rate. If you only know your gross figure, run FiMo's gross-to-net calculator first to convert it.
Why does rent take such a large share of an expat budget?
Expats often rent serviced apartments in central districts priced toward foreign tenants, so housing is usually the dominant line. In the example, rent of 12.000.000 VND is 44.4% of expenses and 30.0% of income — well above the 30% rule of thumb. Because it is so large, adjusting rent (a smaller unit, one district out) moves your savings rate far more than cutting small discretionary lines.
Does the 50/30/20 rule work for life in Vietnam?
It is a useful starting benchmark: 50% needs, 30% wants, 20% savings of after-tax income. On 40.000.000 VND that is 20.000.000 / 12.000.000 / 8.000.000 VND. But it is an illustrative assumption, not a rule — rent-heavy expat budgets frequently push needs above 50%, which is fine as long as your final savings rate still meets your goal. FiMo has a dedicated 50/30/20 tool to test the split.
How do I handle irregular or annual expenses?
Convert them to a monthly average. A 6,000,000 VND annual insurance premium becomes 500,000 VND/month; a 24,000,000 VND yearly flight-home budget becomes 2,000,000 VND/month. Entering these smooths your budget so a big bill does not blow up a single month. FiMo's sinking-fund tool is built specifically for planning these lump-sum costs.
What does a budget deficit mean here?
A deficit means expenses exceed income, so the surplus is negative and the savings rate falls below zero — you are drawing down savings or borrowing to cover the gap. The tool flags it with a deficit alert. The fix is to attack the largest line in the spending breakdown (usually rent) or raise income; track the change by re-running the simulator.
Where should I put my monthly surplus?
A common priority order: (1) build an emergency fund of 3–6 months of expenses, (2) clear high-interest debt, (3) invest for the long term. With a surplus of 13.000.000 VND/month (156.000.000 VND/year), you can use FiMo's emergency-fund and savings-rate tools to plan a concrete allocation.