Working out the year a purchase breaks even

What follows is an argument about break-even on a property purchase, and about where the received version of it stops being true.

What break-even actually means here

It is the point at which the total cost of having bought falls below the total cost of having rented the same period. It is not the point at which the mortgage payment matches the rent, which is a different and much earlier date. Nor is it the point at which the property is worth more than you paid, since that ignores the costs of the transaction.

Getting the definition right is most of the work, because the wrong definition produces a flatteringly short answer.

Add up the one-off costs honestly

On the buying side: transfer tax or stamp duty equivalent, conveyancing, searches, survey, lender and broker fees, and removals. On the selling side: agency commission, legal fees, any exit charge on the loan and, in some countries, a tax on the gain.

On an ordinary week, the two together are the sum being spread over however many years you own the property. They vary so widely between jurisdictions that borrowing a percentage from an article written elsewhere is the most common way to get this wrong.

Then find the annual difference

Compare rent plus renter costs against interest plus maintenance plus insurance plus recurring taxes and charges. The gap between them, positive or negative, is the annual amount available to repay the one-off costs.

If owning costs more each year than renting, the transaction costs are never repaid from cash flow and the whole case rests on price growth. That is a legitimate position, but it should be a conscious one rather than an accident of arithmetic.

Price growth is an assumption, not an input

A growth rate applied to the full property value moves the answer more than any other line, because it applies to the whole asset rather than to your deposit. Leverage magnifies it in both directions, and a modest fall in value can eliminate a deposit entirely. Running the sum at zero growth shows what the purchase does on its own merits.

Running it at a small negative rate shows how much protection the transaction costs actually leave you.

Why break-even is usually later than expected

The early years of a repayment mortgage are mostly interest, so equity builds slowly at first. Maintenance tends to be underestimated because the first year of ownership is often unusually quiet.

For most people, selling costs are frequently omitted altogether, since they feel like a future problem rather than part of this decision. Each of these pushes the crossover later, and together they can move it by years.

None of this is a substitute for talking to a clinician if something feels wrong.

What to do if you are inside the window

If your expected stay is shorter than break-even, renting is not a failure and buying is not automatically wrong. It does mean the purchase needs another justification, such as security, or a property you could let rather than sell. It also raises the value of keeping transaction costs down, since they are the number under pressure.

For most people, none of this is advice; a regulated adviser can run your own figures with your own tax position in them.

The takeaway

Total the costs at both ends, divide by the annual difference, and see whether the answer is shorter than your plans.

Small and repeatable beats ambitious and abandoned, almost every time.