A change to the US tax code, specifically Section 174, has led to a significant increase in tech layoffs. The change, which took effect in 2022, requires companies to amortize research and development expenses over five or 15 years, rather than deducting them immediately. This has resulted in increased tax bills for many tech companies, leading to layoffs and cost-cutting measures. The change has had a disproportionate impact on the tech industry, which has seen over half a million layoffs since the beginning of 2023.