How to Calculate Your Rental Property ROI (With Examples)

You bought a rental property. But is it actually making money? Many landlords look at rent minus mortgage and think they're profitable. The reality is more complex.

Why ROI Matters

Return on Investment (ROI) tells you if your rental property is worth the capital you've invested. It's the difference between feeling wealthy and actually being wealthy.

The Basic ROI Formula

ROI = (Annual Net Income / Total Investment) × 100

Let's break this down with a real example.

Example Property

Purchase Price: £200,000
Deposit (25%): £50,000
Stamp Duty: £6,000
Legal Fees: £1,500
Refurbishment: £8,000
Total Investment: £65,500

Annual Income:

Rent: £12,000
Less Mortgage: -£7,200
Less Expenses: -£2,400
Net Income: £2,400

ROI = (£2,400 / £65,500) × 100 = 3.66%

Is 3.66% good? It depends on your alternatives. If savings accounts pay 4%, you're losing money.

Cash-on-Cash Return

A more useful metric for leveraged investments:

Cash-on-Cash = (Annual Pre-Tax Cash Flow / Cash Invested) × 100

Same property:

Cash Invested: £65,500
Annual Cash Flow: £2,400
Cash-on-Cash: 3.66%

In this case, it's the same because we're not considering appreciation or equity buildup.

The Complete Picture

Smart landlords track multiple metrics:

1. Net Yield

(Annual Net Income / Property Value) × 100

Measures profitability relative to property value.

2. Gross Yield

(Annual Rent / Property Value) × 100

Quick estimation before expenses.

3. Cap Rate

Net Operating Income / Current Market Value

Used for comparing properties.

Improving Your ROI

Increase Income

Raise rent (annually if market allows)
Add parking spaces
Install washing machines
Rent furnished at premium

Decrease Expenses

Switch to cheaper insurance
DIY simple repairs
Annual maintenance prevents costly emergencies
Review management fees

Reduce Capital Investment

Negotiate purchase price
Minimize refurbishment
Use mortgage broker to reduce fees

Common Mistakes

Ignoring Vacancy: Budget for 1 month vacant per year
Forgetting Maintenance: Set aside 1% of property value annually
Not Tracking Time: Your time has value—automation saves hours per property per month
Missing Opportunity Cost: Compare to other investments
Manual Calculation Errors: Spreadsheets are error-prone and time-consuming

When to Sell

If your ROI consistently underperforms alternatives (stocks, bonds, other properties), consider selling. Property shouldn't be emotional.

Let Technology Do the Math

Manual ROI calculations are time-consuming and error-prone. Every missed expense or incorrect formula skews your understanding of profitability.

Landlord Pro automatically calculates your ROI and other key metrics in real-time. As rent comes in and expenses are recorded, you get an up-to-date view of:

Net yield per property
Cash-on-cash return
Monthly profit trends
Portfolio-wide performance

No spreadsheets. No formulas. No guesswork. Just accurate, instant insights that help you make better investment decisions.

Track your performance monthly, compare properties side-by-side, and identify which investments are actually delivering returns. When you can see the numbers clearly, you can act decisively.