# Net Operating Income (NOI) for Short-Term Rentals — Formula, Benchmarks, and Why It Matters

> Net Operating Income (NOI) is the income a short-term rental generates after all operating expenses but before mortgage payments. Learn how to calculate NOI step by step, understand what a healthy NOI margin looks like for STRs, and see why it is the foundation metric behind cap rate, DSCR, and cash-on-cash return.

Canonical: https://www.underwriteapp.com/learn/net-operating-income


## Definition

**Net operating income** (NOI) is the annual income a property produces after all operating expenses are paid, but before any debt service (mortgage payments).

$$\text{NOI} = \text{Gross Revenue} - \text{Operating Expenses}$$

NOI is the foundation of STR investment analysis. [what-is-cap-rate](/learn/what-is-cap-rate), [what-is-dscr](/learn/what-is-dscr), and [cash-on-cash-return](/learn/cash-on-cash-return) all depend on it.

## How to Calculate NOI for an STR

### Step 1 — Estimate gross revenue

Gross revenue for an STR = occupancy rate × average daily rate (ADR) × 365.

**Example:** 68% [occupancy-rate](/learn/occupancy-rate) × $225 ADR × 365 = **$55,845 gross revenue**

Include all revenue sources: nightly rates, cleaning fees charged to guests (if you keep them), pet fees, and early check-in/late checkout fees.

### Step 2 — Subtract operating expenses

STR operating expenses are higher than long-term rental expenses. Budget for all of the following:

| Expense Category | Typical Range | Example ($55,845 gross) |
|-----------------|---------------|------------------------|
| Platform commissions (Airbnb, VRBO) | 3–15% of gross | $2,800 |
| Cleaning & turnover | 8–12% of gross | $5,000 |
| Supplies & consumables | 2–4% of gross | $1,700 |
| Maintenance & repairs | 3–5% of gross | $2,200 |
| Property management | 20–35% of gross (if outsourced) | $0 (self-managed) |
| Property taxes | Market-dependent | $4,200 |
| Insurance (STR/landlord policy) | $2,000–$6,000/year | $3,200 |
| Utilities (electric, gas, water, internet, streaming) | $2,400–$7,200/year | $4,800 |
| Capex reserve | 5–10% of gross | $2,800 |
| Licensing & permits | Market-dependent | $500 |

**Total operating expenses: $27,200**

### Step 3 — Calculate NOI

**$55,845 − $27,200 = $28,645 NOI**

NOI margin: $28,645 ÷ $55,845 = **51%**

## Why NOI Matters

### It connects every metric

- **Cap rate** = NOI ÷ property value → measures return independent of financing
- **DSCR** = NOI ÷ annual debt service → determines loan eligibility
- **Cash flow** = NOI − annual debt service → what lands in your account
- **Cash-on-cash** = Cash flow ÷ cash invested → your actual return

If your NOI estimate is wrong, every downstream metric is wrong.

### It isolates property performance from financing decisions

Two investors can buy the same property with different mortgages and get different cash-on-cash returns. But the NOI is the same — it reflects the property's earning power, not the buyer's loan terms. This makes NOI the right metric for comparing properties and markets.

## STR-Specific Considerations

**Cleaning costs are a major line item.** An STR turning over 3–4 times per week can spend $15,000–$25,000/year on cleaning alone. A long-term rental spends near zero. Always model cleaning as a function of turnover frequency, not a flat percentage.

**Revenue is seasonal.** A beach house might earn 60% of its annual revenue in four summer months. Calculate NOI on an annual basis, but stress-test the off-season months — that's when cash flow goes negative and reserves get tested.

**Platform commissions vary.** Airbnb's host-only fee is ~3%, but the split-fee model (where guests pay most of the service fee) reduces your visible nightly rate. VRBO charges 5–8%. Direct bookings via your own site eliminate commissions but add marketing costs.

**Insurance is higher for STRs.** Standard homeowner's insurance doesn't cover STR activity. You need a commercial or STR-specific policy. Expect $3,000–$6,000/year vs. $1,500–$2,500 for a long-term rental.

## Common Mistakes

**Confusing NOI with cash flow.** NOI does not include mortgage payments. Cash flow = NOI − debt service. Calling NOI "cash flow" overstates what you actually take home.

**Underestimating operating expenses.** First-time STR operators often budget 25–30% for expenses and end up at 45–55%. Build the line-item budget above — don't use a single percentage.

**Forgetting capex reserves.** Appliances, HVAC, roofing, and furnishings all have replacement cycles. Budget 5–10% of gross annually even if nothing breaks this year. Skipping this inflates your NOI today and creates a cash crisis in year 3–5.