✅ Updated March 2026
Rent to Rent ROI Calculator:
How to Analyse Any Deal in Minutes
Before you sign any rent to rent deal, you need to know the numbers cold. This guide shows you exactly how to calculate ROI, stress-test cashflow, and decide whether a deal is worth doing.
What This Guide Covers
The Rent to Rent ROI Formula
Return on investment in rent to rent is calculated differently from buy-to-let because you do not own an asset — your return is measured against the capital you invested to set up the deal.
The basic formula:
Annual Net Profit ÷ Total Setup Cost × 100 = Annual ROI %
Example calculation for a 5-bed HMO:
- 5 rooms × £550/month = £2,750 gross income
- Less: Guaranteed rent to landlord: £1,200/month
- Less: Utilities (average): £350/month
- Less: Insurance: £60/month
- Less: Maintenance reserve: £100/month
- Less: Council tax: £150/month
- Net monthly profit: £890
- Annual net profit: £10,680
- Setup cost (furnishing + legal + first month’s rent): £11,000
- Annual ROI: 97%
How to Stress-Test Any Rent to Rent Deal
A deal that only works at 100% occupancy is not a good deal. Always stress-test at reduced occupancy levels:
- At 80% occupancy (1 void room) — with 4 of 5 rooms occupied: £2,200 income, subtract fixed costs of £1,860 = £340 net profit/month. Still positive — the deal survives a void
- At 60% occupancy (2 void rooms) — with 3 of 5 rooms occupied: £1,650 income, subtract fixed costs of £1,860 = -£210 net loss. Below this occupancy, the deal loses money
- Break-even occupancy rate — this deal breaks even at approximately 68% occupancy. Anything above this generates profit
A good rent to rent deal should break even at 65–75% occupancy. If a deal only breaks even at 85%+ occupancy, the landlord rent is too high or the room rates are too low. For more detail, see typical HMO room rates.
Other Key Metrics to Calculate Before Signing
Beyond ROI and break-even occupancy, calculate these metrics for every deal:
- Payback period — how many months to recover your total setup investment from net profits. For the example above: £11,000 setup ÷ £890 net monthly profit = 12.4 months payback. Under 18 months is excellent
- Contract value — total profit over the full contract term. For the example above on a 3-year contract: £890 × 36 months = £32,040. This is the total value of winning this deal
- Gross yield — annual gross income ÷ setup cost × 100. £33,000 ÷ £11,000 = 300%. A simple measure of how hard your capital is working
- Sensitivity to rent changes — what happens if room rates fall 10%? If the market softens, can you still pay the landlord and cover your costs? Model this before signing
Frequently Asked Questions
What is a good ROI for a rent to rent deal?
A well-structured rent to rent HMO deal should achieve 60–150% annual ROI on your setup costs. Single let deals typically achieve 40–80% ROI as the profit margins are lower but so are the setup costs. Any deal achieving less than 30% annual ROI should be scrutinised carefully — the risk-reward ratio may not justify the commitment. For more detail, see typical profit per property.
Should I include my time in the ROI calculation?
Your time has value, but most operators do not include it in the initial ROI calculation — they calculate financial return on capital invested. As your business grows, you will want to separate your management income (what you pay yourself to run the properties) from your investment return. In the early stages, treat the time as an investment in building skills and a portfolio.
What costs do most beginners forget to include in their rent to rent analysis?
The most commonly missed costs are: council tax, maintenance reserve (budget £50–£150/month per property), licence fees for HMOs (typically £500–£1,500 per application), gas safety and electrical checks (annual costs), and a void allowance (budget for 10–15% average void rate even in good markets). Miss these and your actual profit will be significantly lower than your projection. For more detail, see how rent-to-rent tax works in the UK.
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