The four yield metrics — and why all of them matter
Investors regularly quote "yield" without specifying which one they mean — and the difference between them is large. On the same property, gross yield might be 6.5% while cash-on-cash return is 1.2%. Both are technically correct. Neither is the full picture on its own.
| Metric | What it measures | What it ignores |
|---|---|---|
| Gross yield | Annual rent / purchase price | All costs: vacancy, maintenance, IMI, tax |
| Net yield | Net rent (after running costs) / purchase price | IMT, financing, tax on income |
| Cap rate | NOI / purchase price | Financing structure (unlevered return) |
| Cash-on-cash | Annual cash flow / capital deployed | Capital appreciation |
For investment analysis, use them in sequence: gross yield for initial screening, cap rate for comparing properties on an equal footing, and cash-on-cash for understanding the actual return on your capital once financing is in place.
Gross yield — the first filter
Gross yield is the starting point, not the destination. It tells you how much rent the property generates relative to its price, before any costs. It's useful for quickly comparing a large number of properties — anything below 4.5–5% gross yield in Lisbon is unlikely to make sense as a pure income investment once you strip out costs.
The problem: gross yield on a property listed at €280,000 with €1,600/month rent looks like 6.9% — but that number includes nothing about vacancy, annual IMI, condominium fees, maintenance, or IRS on income. The real return is lower.
Cap rate — the property's true operating return
Cap rate (capitalisation rate) is the metric most serious investors use to compare properties. NOI (Net Operating Income) = annual rent minus vacancy loss minus all operating expenses including IMI. Importantly, cap rate is calculated before financing — it measures the property's performance independent of how you're paying for it.
Cash-on-cash — what you actually earn on your capital
Cash-on-cash is the most honest measure of investment performance: it compares the annual cash flow (after paying the mortgage) to the total capital you actually deployed — down payment plus IMT, IS, notary, legal fees, and any renovation costs.
For most leveraged buy-to-let investments in Portugal in 2026, cash-on-cash return sits between 1–4% pre-tax. After IRS at 28% on net rental income for non-residents, after-tax cash-on-cash can be close to breakeven on many deals. This is why property selection and deal quality matter so much more than market selection.
Worked example: Alvalade T2, Lisbon
A two-bedroom apartment in Alvalade — one of Lisbon's most stable residential zones — priced at €280,000.
| Metric | Calculation | Result |
|---|---|---|
| Gross yield | €19,200 / €280,000 | 6.86% |
| Vacancy loss (5%) | €19,200 × 5% | −€960 |
| Operating costs (condo, maintenance, insurance) | estimated | −€3,800 |
| IMI (0.4% of price) | €280,000 × 0.4% | −€1,120 |
| NOI | €13,320 | |
| Cap rate | €13,320 / €280,000 | 4.76% |
| Mortgage (€196k, 30yr, 5.5%) | −€13,356 | |
| Annual cash flow (pre-tax) | −€36 (breakeven) | |
| Capital invested (30% dp + costs ~€20k) | €104,000 | |
| Cash-on-cash | ~0% pre-tax |
2026 benchmarks by city
Gross yield ranges for T1–T2 apartments in typical residential condition across Portugal's main investment markets:
| Market | Gross yield | Est. cap rate | Profile |
|---|---|---|---|
| Lisbon — premium (Chiado, Príncipe Real) | 3–4.5% | 1.5–2.5% | Capital appreciation play |
| Lisbon — mid (Alvalade, Areeiro) | 5.5–7% | 3.5–5% | Balanced income + appreciation |
| Lisbon — emerging (Mouraria, Intendente) | 7–9% | 5–7% | Income-first, higher risk |
| Porto — premium (Foz, Boavista) | 4–5.5% | 2.5–4% | Similar to Lisbon premium |
| Porto — mid (Bonfim, Paranhos) | 6–8% | 4–6% | Better yield, lower entry price |
| Algarve (Lagos, Tavira) | 5–7%* | 3–5% | *Long-term only; STR adds complexity |
| Braga / Coimbra | 6–8% | 4.5–6.5% | University cities; lower entry prices |
| Setúbal / Almada | 5.5–7% | 3.5–5% | Lisbon commuter belt; strong demand |
What most affects rental yield in Portugal
- Purchase price relative to the zone. The single biggest lever. A property bought 10% below zone average immediately gains ~1pp in gross yield. This is why investifique focuses on price delta detection.
- IMT and acquisition costs. At 6.5% for investment properties plus IS and notary, acquisition costs add ~8–9% to your effective cost base. This compresses yield on any given asking price.
- IMI. At 0.3–0.45% annually, IMI reduces NOI by a fixed amount. Often overlooked in quick yield calculations but material over time.
- Vacancy rate. Lisbon's long-term rental vacancy is low — typically 3–6% in established zones. In emerging zones or if you are an absent landlord, budget conservatively at 8–10%.
- Financing rate. In a higher-rate environment, the difference between a 4% and 6% cap rate becomes critical for debt service coverage. Cap rate above financing cost = positive leverage. Below = negative leverage.
Find properties where the yield is above the zone benchmark.
investifique's Yield Watch signal identifies properties where the estimated cap rate is meaningfully above comparable properties in the same zone — which is where the real opportunities are.