Home Affordability Calculator (VND)
"How expensive a home can I actually afford?" is, underneath, a question about the monthly repayment your income can carry — not about the sticker price. Lenders in Vietnam size a mortgage from your debt-to-income ratio (DTI): total monthly debt payments must stay under a set share of income, commonly 40–50%. This calculator runs that constraint in reverse — take the largest payment the cap allows, convert it into the largest loan that payment can service, then add your cash down payment to get a price ceiling.
Worked through with illustrative numbers: a 40.000.000 VND/month income, 3.000.000 VND/month of existing debt (a car loan, consumer credit), and 500.000.000 VND saved for a down payment. At a 40% DTI cap, the most you can put toward a mortgage is 13.000.000 VND/month. Assuming a 10%/year rate over a 20-year term, that payment supports a loan of roughly 1.347.120.043 VND; add the 500.000.000 VND down payment and your ceiling is about 1.847.120.043 VND.
Two practical points. First, existing debt erodes buying power fast: that 3.000.000 VND/month of current repayments drops your ceiling by about 310.873.856 VND versus carrying no other debt. Second — and this matters more for foreigners — the 10%/year here is an illustrative assumption, not a quote, and your eligibility to borrow at all is constrained: most Vietnamese banks lend to foreigners only under specific conditions (residence status, the property type a foreigner may legally own, sometimes a local guarantor). Treat the output as a financial ceiling, then confirm what you can actually borrow.
How the calculator works
Step 1 — The maximum monthly payment
Affordable payment = Income × DTI% − existing monthly debts
| Term | Meaning |
|---|---|
| Income | Stable monthly income, net of tax and insurance |
| DTI% | The maximum debt-to-income share the lender accepts (e.g. 40%) |
| Existing debts | All other monthly repayments (car, cards, consumer loans) |
For the example: 40.000.000 × 40% − 3.000.000 = 13.000.000 VND/month left for the mortgage.
Step 2 — Convert the payment into a loan
A level monthly payment maps to a loan through the present-value-of-an-annuity formula:
Max loan = Payment × (1 − (1 + r)^−n) / r
where r = annual rate / 12 / 100 is the monthly rate and n = years × 12 is the number of payments. This is the standard amortising-mortgage formula. At the illustrative 10%/year over 20 years, 13.000.000 VND/month services about 1.347.120.043 VND of principal.
Step 3 — Add the down payment
Max home price = Max loan + Down payment
= 1.347.120.043 + 500.000.000 = 1.847.120.043 VND. Here the 500.000.000 VND down payment is about 27.1% of the price; the rest is borrowed. Banks frequently require a minimum down payment of 20–30% of the property value, so check this ratio against the loan package's rules.
What the model leaves out
It assumes a constant rate for the whole term and ignores transaction costs beyond the price (notary and registration fees, transfer tax, agent commission, furnishing), plus the fact that promotional rates usually float higher once the intro period ends. The result is a DTI-based technical ceiling, not advice to borrow the maximum — borrowing to the cap leaves no buffer for rate rises or income shocks.
Worked example: one buyer, three DTI caps
Illustrative assumptions held constant: 40.000.000 VND/month income, 3.000.000 VND/month existing debt, 500.000.000 VND down payment, a 10%/year rate, a 20-year term. Only the DTI cap the lender allows changes:
| DTI cap | Max monthly payment | Max loan | Home price ceiling |
|---|---|---|---|
| 30% (conservative) | 9.000.000 | 932.621.568 | 1.432.621.568 |
| 40% (typical) | 13.000.000 | 1.347.120.043 | 1.847.120.043 |
| 50% (stretched) | 17.000.000 | 1.761.618.518 | 2.261.618.518 |
The spread is wide: moving from a 30% to a 50% cap lifts the price ceiling from 1.432.621.568 to 2.261.618.518 VND — a 828.996.950 VND difference, bought purely by committing more of your income to debt. But a 50% DTI means half your income services loans, leaving almost no buffer for illness, job loss or a rate increase. A 30–40% range is usually safer for the long haul.
Two other levers are worth testing.
- Lengthen the term. Holding DTI at 40% but borrowing over 25 years instead of 20 raises the ceiling by about 83.493.948 VND — at the cost of more total interest over the life of the loan.
- Clear existing debt first. Removing the 3.000.000 VND/month repayment lifts the ceiling by 310.873.856 VND at the same 40% DTI. Pay down a car loan or card balance before applying and you literally buy yourself a bigger budget. To dig into your personal borrowing limit, pair this with FiMo's borrowing power and DTI/LTI tools.
Frequently asked questions
How much home can a 40 million VND/month salary afford?
It depends on existing debt, your down payment, the rate and the term. Under the illustrative assumptions on this page — 3.000.000 VND/month of debt, a 500.000.000 VND down payment, 10%/year over 20 years and a 40% DTI cap — the ceiling is about 1.847.120.043 VND (a 1.347.120.043 VND loan with a 13.000.000 VND/month payment). Enter your own figures for a realistic number.
What is DTI and how much do banks lend against income?
DTI (debt-to-income) is the share of monthly income consumed by total debt payments. Most Vietnamese lenders cap mortgage DTI around 40–50%, some more conservatively at 30%. A higher cap supports a bigger loan: in this page's example, raising the cap from 30% to 50% lifts the price ceiling from 1.432.621.568 to 2.261.618.518 VND — but a 50% DTI leaves almost no budget buffer.
What is the home affordability formula?
Three steps: (1) Affordable payment = Income × DTI% − existing debts; (2) Max loan = Payment × (1 − (1 + r)^−n) / r, where r is the monthly rate and n the number of payments; (3) Max price = Max loan + down payment. Verifiable: 40.000.000 × 40% − 3.000.000 = 13.000.000 VND/month, which services a 1.347.120.043 VND loan at 10%/year over 20 years; add 500.000.000 VND down to reach 1.847.120.043 VND.
Can foreigners get a mortgage to buy property in Vietnam?
Sometimes, but with constraints. Lending to foreigners typically depends on residence status, the property type a foreigner may legally own (foreigners are generally limited to apartments within ownership quotas, not land-use rights), and sometimes a local guarantor or co-borrower. This calculator gives a financial ceiling based on income and DTI; whether you can actually borrow at that level is a separate legal and bank-policy question. Confirm eligibility with the specific lender before relying on the number.
How does existing debt change what I can afford?
Existing repayments come straight off the payment you are allowed. In the example, 3.000.000 VND/month of current debt cuts the price ceiling by 310.873.856 VND versus being debt-free, even at the same 40% DTI. Clearing small balances — a car loan, a credit card — before you apply can meaningfully raise the home price you qualify for.
Does a longer loan term let me buy a more expensive home?
Yes, because it spreads the repayment thinner. Holding DTI at 40% but borrowing over 25 years instead of 20 raises the ceiling by about 83.493.948 VND. The trade-off is more total interest over the life of the loan, since you owe for longer. It is a way to raise affordability without raising income, but weigh the lifetime cost.
Is the interest rate in this tool a real Vietnamese mortgage rate?
No. The 10%/year used throughout is an illustrative assumption chosen to keep the math easy to follow. Real Vietnamese home-loan rates vary by bank, promotional package and date, and usually float higher after the introductory period ends. Enter the rate your bank actually quotes — and stress-test the post-promo rate too, since that is what you pay for most of the term.