The landlords who survived the rate shock were not lucky. They spent an hour you have not spent

One hour. That is roughly the difference between the landlords who were calm when rates moved and the ones who were not.

I noticed the two groups long before I understood them. For a while I assumed the calm ones were simply luckier: better timing, cheaper debt, kinder circumstances. The more portfolios I looked at, the less that held up. The calm ones had done the work in advance. They already knew what they could withstand, because they had tested it, and knowing is a remarkably effective sedative.

The panic was not bad luck. It was an hour of work nobody had done.

What stress testing actually means

It means modelling the portfolio under adverse conditions to see what breaks, and at what point. You take the things that could move against you, higher interest rates, longer voids, unexpected costs, softer rents, and you push the numbers until something gives.

It is the financial equivalent of checking how much weight a structure will bear before you load it, rather than finding out when it comes down. The point is to discover the limits on a spreadsheet instead of in real life, with real money and a real deadline.

It does not require sophistication either. It requires a willingness to ask uncomfortable what if questions at a time when you are calm enough to answer them honestly.

The scenarios that earn their place

Interest rates rising. Model the portfolio at two, three, even four percentage points above where you sit now, and watch what happens to cash flow as cheap fixed rates roll off. This is the one I would run first, because a great many landlords financed in a cheap rate window that is ending, and the remortgage cliff is not a forecast. It is a diary.

Voids extending. What happens if a property sits empty for two months, or if several do at once? Can the portfolio carry the lost rent while the costs carry on regardless?

Costs landing together. A boiler, a major repair and a regulatory upgrade in the same quarter. Surprises rarely arrive politely spaced out.

Rents softening. If you could not raise rents, or had to drop them, where would that leave the numbers?

You are not predicting any of this. You are finding out whether you would be fine if it happened, which is a different and much more useful question.

The point is not the warning, it is the room to act

If the test shows fragility, you still have time. You can build cash reserves, reduce borrowing on the most exposed property, revisit the financing structure, or let go of the property that does not survive the stress.

All of those are genuine options while conditions are calm. Very few of them are available halfway through a crisis, when the choices narrow to whatever you can do this week. The landlords who modelled higher rates before they arrived were executing a plan when rates moved. Everybody else was reacting. That gap, plan against panic, is almost entirely the product of having done the modelling first.

Which is the awkward thing about resilience. It is not built in the storm, it is built in the quiet stretch beforehand, by an unglamorous exercise that feels completely unnecessary right up until the moment it would have saved you.

So book the hour. Run the adverse scenarios. Find out where the portfolio is strong and where it is thin, while you still have the headroom to do something about the answer.

It is not a difficult hour. It is just one nobody ever feels like booking.

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Your home or other property may be repossessed if you do not keep up repayments on your mortgage. Most buy to let mortgages are not regulated by the Financial Conduct Authority.

This article is general information, not personal financial advice. Stress testing your own portfolio is best done with professional input suited to your circumstances.

Legacy Capital Management is an Appointed Representative of and represents only St. James’s Place Wealth Management plc (which is authorised and regulated by the Financial Conduct Authority) for the purpose of advising solely on the Group’s wealth management products and services, more details of which are set out on the Group’s website at www.sjp.co.uk/products.

The ‘St. James’s Place Partnership’ and the titles ‘Partner’ and ‘Partner Practice’ are marketing terms used to describe St. James’s Place representatives.

Legacy Capital Management, Rosewood House, Duffield Park, Stoke Poges, SL2 4HY

SJP Approved 27/07/2026