Stress test your portfolio in seconds – 2025 Update

UPDATE August 2025: I have now updated the stress test tool to take into account two new scenarios, as described in full at the foot of this article. The new scenarios look at what would happen if Trump escalates his trade war and what would happen if the US dollar suddenly strengthened.

Investors, be they professional or DIY investors, don't give enough consideration to the downside potential of their portfolios. When engineers build a new skyscraper they don't just focus on reaching for the stars. In fact, they pay more attention to the structure's ability to remain upright. How will the structure cope in high winds or an earthquake? How much weight can it hold per square inch? This stress testing of materials and construction ultimately lays the foundation for the success of the project.

Building an investment portfolio shouldn't be any different.