At the showroom, agents love to say "the down payment is 800,000 and the monthly payment is about 6,000" — but you have no idea whether that is actually a big burden or a small one. One classic metric turns "can I afford it?" into a comparable number: the price-to-income ratio. Today we explain what it is, how to calculate it, what counts as reasonable, and how it helps you decide how big a home to target.
How to Calculate It: Home Price ÷ Household Annual Income
The formula is simple: price-to-income ratio = total home price ÷ household annual income. It measures how many years of a family's income it takes to buy a home (assuming all income went to housing). For example, a home priced at 2.4 million with a household income of 300,000 gives a ratio of 240 ÷ 30 = 8 — meaning 8 years of income buys the home.
There is an international reference: UN-Habitat and World Bank commonly cite 3-6 as the reasonable range, meaning affordability is good when the ratio is between 3 and 6; above 6 is stretched, and above 10 is very stressful. In Chinese first-tier cities the ratio commonly runs 10-20; in third- and fourth-tier cities it is 6-10. So the saying "buying in a first-tier city is stressful" is backed by data, not complaining.
When computing the ratio, use household after-tax annual income (the combined take-home pay of both earners) and the total price of the target property. To estimate your own capacity precisely, first use our salary calculator to get your real take-home annual income, then plug it into the ratio and compare with the reasonable range.
| Price-to-Income Ratio | Affordability | Typical Situation |
|---|---|---|
| Below 3 | Very comfortable | High income / low prices, little pressure |
| 3-6 | Reasonable range | International benchmark for good affordability |
| 6-10 | Stretched | Must compress other spending; common in 3rd/4th-tier cities |
| 10-15 | Stressful | Parts of first-tier cities; long repayment period |
| Above 15 | Extreme | Severe overstretch; evaluate carefully |
One caveat: the price-to-income ratio is a macro reference. It assumes all income goes to housing, but in reality you also need food, children, and other loans. It is excellent for horizontal comparison (across cities or properties), but not the only criterion for "can I buy" — that requires the finer-grained monthly-payment-to-income ratio.
Work Backward: What Price of Home Can You Afford?
Flip the formula around and you can estimate the maximum total price within reach. Suppose your target ratio is 8 (tight but acceptable) and household income is 300,000: affordable total price = 300,000 × 8 = 2.4 million. If you want less pressure and target a ratio of 6, the affordable total is 300,000 × 6 = 1.8 million.
Now add the key variable — the down payment. For a 2.4-million home at a 30% down payment you need 720,000 in cash and a loan of 1.68 million. If you only have 500,000 for the down payment, your ceiling changes: either lower the price target or raise the down-payment ratio. Down payment and monthly payment are two independent constraint lines — whichever binds first wins.
Putting price-to-income, down payment, and monthly payment together is the complete affordability picture. Recommended flow: use the ratio to bracket your price range, then use our mortgage calculator with the loan amount, term, and rate to get the real monthly payment, and finally check it against your income. Pair it with the loan calculator to try different terms and down-payment ratios. Three steps, and the answer to "should I buy, and how big" is basically clear.
Three Mistakes People Make with the Price-to-Income Ratio
Mistake one: treating it as a verdict on whether to buy. The ratio only measures static affordability — it ignores price expectations, rental costs, and accumulated family assets. Someone with down-payment support and an affordable monthly payment may reasonably buy even at a high ratio; someone with high income but zero savings may not.
Mistake two: using pre-tax income. The denominator should be take-home income. A household earning 400,000 pre-tax might take home only 300,000 after tax and social insurance; using 400,000 badly understates the pressure. Always use the after-tax figure.
Mistake three: looking only at the total price and ignoring holding costs. Buying costs more than the price tag — there are deed taxes, maintenance funds, decoration, property fees, and annual interest. These "invisible costs" can add 10%-15% to the total. For a realistic view, treat total price × 1.1 as your actual capital need.
FAQ
Q1: What is a normal price-to-income ratio?
The international reasonable range is 3-6; above 6 is stretched and above 10 is stressful. But it is a macro reference and cities differ enormously: first-tier cities commonly 10-20, third/fourth-tier 6-10. For personal decisions, combine it with the monthly-payment-to-income ratio (50% red line) — that is more realistic than the ratio alone.
Q2: Can I compare ratios across cities?
Roughly, yes, but mind the income-caliber difference. Two cities both at 12 may hide very different realities — high income with growth in one, low income with weak mobility in the other. The ratio works for coarse city comparisons, not precise standards.
Q3: How do I combine my partner's income?
Use total household after-tax income. Add both take-home incomes as the denominator, and if you plan children or caring for parents, leave a buffer instead of counting current income at 100%.
Q4: Does a low ratio guarantee I can buy?
No. It ignores down-payment accumulation speed, interest rates, and income stability. A ratio of 5 looks fine, but if the down payment takes 10 years to save and rates are high, the real pressure may be large. It is one affordability check, not the whole story.
Q5: The ratio is 15 now. Can I still buy?
A high ratio does not automatically mean no. What matters is whether the down payment is ready, whether the monthly-payment-to-income ratio stays under the red line, and your view on prices. If the three lines tighten, either lower the price target (smaller unit, suburb), raise the down-payment ratio to cut the monthly payment, or rent and keep saving.