Return rate and contribution are different questions
A performance rate — gross yield, net yield, capital growth rate, cash-on-cash return — tells you how efficiently a property is using its own capital. Contribution tells you how much of the portfolio's actual dollar outcome that property is responsible for. They can point to completely different properties, and conflating them is one of the easiest ways to misjudge a portfolio.
| Metric | City Apartment | Family House | Townhouse | Regional House |
|---|---|---|---|---|
| Property value | $500,000 | $900,000 | $600,000 | $350,000 |
| Weekly rent | $400/week | $750/week | $560/week | $480/week |
| Net weekly cash flow* | −$94/week | −$35/week | −$40/week | +$245/week |
Contribution to income and cash flow
By rental income, Family House contributes the most — as its size would suggest:
| Property | City Apartment | Family House | Townhouse | Regional House |
|---|---|---|---|---|
| Contribution to portfolio rental income | 18.3% | 34.2% | 25.6% | 21.9% |
Cash flow tells a completely different story. City Apartment, Family House and Townhouse each run negative once operating costs and loan interest are counted (−$94, −$35 and −$40 a week). Regional House alone contributes +$245 a week — a single property, worth just 14.9% of total portfolio value, that single-handedly supplies more net cash flow than the entire rest of the portfolio combined (which nets to about −$169 a week without it). Without Regional House, this portfolio would be cash-flow negative overall.
Regional House has the highest individual yield in the portfolio (7.13%), so its outsized cash flow contribution isn't a coincidence — but the size of that contribution, and the fact that it single-handedly keeps the portfolio positive, is only visible once you calculate contribution directly rather than just noting it has "a good yield."
Contribution to value, equity and growth
Contribution to value and equity mostly tracks size, as expected — Family House supplies 38.3% of portfolio value and 38.9% of portfolio equity, both the largest shares. Contribution to capital growth is less predictable, because it depends on how much each property has actually appreciated, not just how big it is today.
| Property | City Apartment | Family House | Townhouse | Regional House |
|---|---|---|---|---|
| Contribution to portfolio value | 21.3% | 38.3% | 25.5% | 14.9% |
| Contribution to portfolio equity | 16.7% | 38.9% | 20.0% | 24.4% |
| Contribution to portfolio dollar growth since purchase | 22.2% | 33.3% | 25.0% | 19.4% |
Regional House is the standout on cash flow (contributing more than the rest of the portfolio combined) but the smallest contributor to capital growth (19.4%) — the same property occupies opposite ends of the ranking depending on which dimension you ask about. There is no single "best property" answer; there's a best property for cash flow, a different one for growth, and potentially a third one for equity.
Why 'best' or 'worst' needs more than a yield sort
A high-yield property can still be a small contributor
If it represents a small share of total capital, even an excellent yield translates into a small dollar contribution to the portfolio's overall result.
A mediocre-yield property can be the biggest contributor
Size, debt level and operating costs all affect contribution independently of yield — a large, lightly-geared property can quietly supply most of the portfolio's income or growth.
- Calculate contribution separately for income, cash flow, value, equity and growth — don't assume one measure predicts another.
- Before assuming a property is underperforming, check its contribution, not just its rate — a property with an average yield can still be doing most of the portfolio's real work.
- This feeds directly into concentration analysis — see how concentrated is your property portfolio — since a property that contributes the most is often also the one the portfolio is most exposed to.
Portfolio Performance series
Property contribution FAQs
- What is the difference between a property's return and its contribution to the portfolio?
- Return (yield, capital growth rate, or cash-on-cash return) describes how efficiently a property uses its own capital. Contribution describes how much of the portfolio's actual total result — income, cash flow, value, equity or growth — that property produces in dollar terms. A property can have the best return in a portfolio while contributing very little, simply because there's little capital behind it; another property can have an average return and still supply most of the portfolio's real outcome, because it represents most of the capital.
- Can a small property contribute more to portfolio cash flow than a large one?
- Yes, and it's more common than it sounds. A small property with a low loan balance can generate strong net cash flow even with a modest yield, while a much larger property with more debt can run cash-flow negative despite a healthy yield. Cash flow depends on debt and costs as well as rent, so size and contribution frequently diverge.
- How do I calculate a property's contribution to portfolio performance?
- For each dimension, divide that property's figure by the portfolio total: contribution to income = property's rent ÷ total portfolio rent; contribution to cash flow = property's net cash flow ÷ total portfolio net cash flow; contribution to growth = property's dollar value growth ÷ total portfolio dollar value growth. Calculate each dimension separately — a property's contribution to one measure says little about its contribution to another.
- Why can't I just sort my properties by yield to find the best one?
- Yield only measures rental efficiency relative to value — it says nothing about how much of the portfolio's actual income, cash flow or growth that property is responsible for, nor about the risk concentrated in it. Two properties can have identical yields and completely different contributions, simply because one is twice the size of the other.