Property Return on Investment: Look Beyond Year One
January 14, 2022
A property can have an attractive first-year rental return and still be the wrong investment for your plan. Equally, a property with a lower initial cash return may deserve consideration if you’ve bought well, can add value sensibly and intend to own it for a long time.
That’s why I don’t want a single return-on-investment percentage making the decision for me. I still calculate the numbers. I just want the calculation to describe the investment I’m actually making, including its costs, time horizon and risks.
In my January 2022 video, I called this a combined approach to ROI. I was trying to compare the whole investment rather than looking only at year-one rent. This article explains that idea, including the places where a model can mislead if you mix cash, equity and borrowed money together.
You can watch my original property ROI explanation for the examples that prompted this approach.
What a rental ROI calculation tells you
The basic calculation I used was annual rental profit divided by the cash invested, multiplied by 100. If a property produces £20,000 after the costs included in your calculation and you’ve invested £100,000 of your own cash, the result is 20%.
That can be a useful comparison, provided you’re consistent about what counts as a cost and what counts as cash invested. Two spreadsheets aren’t comparable if one includes buying costs, reserves and management while the other leaves them out.
I’d also make the tax position clear. A pre-tax projection isn’t the same as the money available to spend personally. Ownership structure, borrowing and individual circumstances can all affect what remains after tax.
So the formula itself isn’t the problem. The problem is treating a narrow answer as though it tells you everything about a property, especially where two investments have different timescales or value-adding work.
Why a modest refurbishment can confuse the comparison
In the video, I compared two properties bought for £160,000. One had £10,000 spent on a light refurbishment and an estimated end value of £180,000. The other had no work done and remained worth £160,000.
If their rents were similar, the unrefurbished property could show a stronger rental ROI because less cash had gone into it. But the first property might have gained value beyond the cost of the work.
On those simplified assumptions, £10,000 of work produces a £20,000 uplift from purchase price to estimated value, leaving £10,000 of potential additional equity before other costs. That’s something I want to understand, even if it isn’t immediately available as cash.
It isn’t a guaranteed gain. The end value needs evidence, and any additional holding, finance or transaction costs reduce the benefit. A refurbishment should improve the investment, not just improve how exciting its spreadsheet looks.
The value of time belongs in the assessment
A project that produces a strong result after two years isn’t the same as one that produces the same result after six months. Time affects finance costs, cash availability and the opportunities you can’t pursue while your money is committed.
This was one reason I wanted to look beyond a single year. A substantial renovation may have little or no rent during the work. A straightforward rental property may be producing income while the other project is still being completed.
I’d compare investments across a common period and include the actual sequence of cash going out and coming back. A simple total percentage can hide those differences, particularly where you inject more money partway through.
You don’t need to make the model unnecessarily complicated. You do need to avoid comparing a quick project and a long hold as though they take the same amount of time and require the same commitment.
A higher-yielding area isn’t automatically the better choice
Another example in the video concerned two properties in different parts of a town. If one costs less but rents for a similar amount, its rental yield and cash return may look stronger.
That matters, but I’d also want to understand tenant demand, maintenance, management, resale prospects and the evidence for future value. Those factors can differ even between nearby streets.
I used different growth assumptions to illustrate how a longer-term comparison could change. Those percentages were assumptions, not promises that a nicer area will always grow faster. An attractive location can still be a poor purchase if you pay too much.
The practical point is to investigate the reasons behind the numbers. A lower yield doesn’t excuse a weak deal, and a higher yield doesn’t settle every question about quality or risk. My approach to planning a property investment starts with what I need the investment to achieve.
What my Newbury flat example was designed to show
In the video, I used a Newbury flat bought for £160,000, with rent of £950 a month and an estimated value of £180,000. The model showed a first-year rental return of about 9.46% using the particular costs entered.
It then included the estimated difference between purchase price and value, producing a much higher combined figure. That was intended to show that the entry price mattered, not just the rent.
I wouldn’t present that combined figure as cash earned in a year. The £20,000 valuation difference was estimated equity. It wasn’t sitting in the bank, and I explicitly said that I couldn’t simply buy at £160,000, do no work and assume a lender would immediately refinance at £180,000.
The example makes more sense when the components stay visible: rental cash flow, estimated equity and any future borrowing. Combining them can be useful for exploring a scenario, but it mustn’t conceal what each number represents.
Growth assumptions should be adjustable
The model in the original video used assumptions for property-price growth and rental increases. I wanted to see what a deal might look like over several years rather than pretending that year one was the whole investment.
That’s a useful exercise only if you remain honest about uncertainty. The future won’t follow a neat spreadsheet path. Values may fall or stay flat, rents may grow more slowly and costs may rise faster than expected.
I’d run several versions: no capital growth, modest growth and a more optimistic outcome. I’d also test weaker rent, higher maintenance and a period without a tenant. That shows which assumptions the result depends on most heavily.
If the investment only looks worthwhile when you give it strong annual growth, that’s important information. It tells you that the case for buying rests on a forecast rather than today’s cash flow and purchase terms.
Keep refinancing out of the profit column
This is one of the most important distinctions in any property model. A refinance can return some cash you’ve invested, but the cash comes from a loan. It doesn’t create an extra profit on top of the equity already counted.
Suppose a valuation increase adds £20,000 to your equity before costs. If you then borrow £15,000 against that increase, you haven’t made another £15,000 of investment profit. You’ve changed the balance between equity, debt and cash.
The released money may be useful for the next purchase, but it also creates interest costs and repayment obligations. Counting both the whole valuation gain and the whole refinance release as separate gains would exaggerate the result.
My article on building a portfolio through refinancing explores how capital recycling can work. The ability to reuse cash and the return earned on an investment are related questions, but they aren’t the same question.
Put the less exciting costs into the model
Buying costs, mortgage fees, legal work, renovation, certificates, management, insurance, repairs and empty periods all affect the result. With a flat, service charges and potential major works also need proper attention.
The original example included an allowance that combined insurance and service charge. That was specific to the flat and the model shown; it isn’t a standard allowance for other leasehold properties.
I’d use the actual lease documents, recent service-charge information and known planned works when assessing another flat. A modest monthly estimate can be misleading if a substantial bill is approaching.
Tax needs its own consistent treatment too. HMRC’s guidance on working out rental income explains relevant expense principles, but accounting profit, taxable profit and cash flow aren’t identical. I’d have an accountant check the tax assumptions rather than labelling every outgoing a deduction.
Compare outcomes without pretending the risks are equal
A projected return of 20% doesn’t automatically beat one of 10%. The higher number may require a difficult conversion, uncertain planning permission, more borrowing or a valuation that hasn’t yet been established.
I’d ask what could prevent the projected outcome, how much extra money might be required and whether I can carry the project if it takes longer. Those questions help explain why the return is available in the first place.
The model should support judgement, not replace it. A spreadsheet cannot inspect a roof, establish local demand or tell you whether your contractor’s programme is realistic. Those inputs come from investigation.
I also want to know whether the investment suits the way I want to spend my time. An apparently superior return may be less attractive if it requires a level of involvement I can’t provide or don’t want.
Our buy-to-let deal calculator helps keep those figures separate: cash required, rental cash flow and return on cash employed. I’d enter realistic costs and test weaker assumptions before treating a headline return as useful. Its figures are illustrations before tax, and refinancing adds debt rather than creating profit.
Use several clear measures instead of one impressive number
For my own decision, I’d want the annual pre-tax cash flow, the cash committed, the likely work and the range of possible future values. I’d show borrowing and any capital released separately.
I’d then compare the alternatives over a sensible common period and ask whether the less comfortable version is still manageable. That gives me a clearer picture than a single combined percentage presented without its assumptions.
The original point of my video still stands: year-one rental ROI isn’t the whole story. But looking at the whole story means making the model more transparent, not simply producing a bigger return figure.
If you’d like help thinking through the assumptions in a deal, book a free 30-minute call. You can also explore the Starter Club or find out about Done For You.