 The catch-up contributions are higher in 2024 and 2025. So if you are contributing to a 401k, you know that the contribution limit is $23,000 if you're under 50. It's $7,500 catch-up contribution if you're over 50. So you can contribute up to $30,500 to a 401k if you are over 50 years old. This is another one that's a big one.