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Can my employer limit my maximum 401k contribution amount (below the IRS limit)?
Congratulations on your raise! Is my employer allowed to impose their own limit on my contributions   that's different from the IRS limit? No. Is it something they can limit at will, or are they required to allow   me to contribute up to the IRS limit? The employer cannot limit you, you can contribute up to the IRS limit. Your mistake is in thinking that the IRS limit is 17K for everyone. That is not so. You're affected by the HCE rules (Highly Compensated Employees). These rules define certain employees as HCE (if their salary is significantly higher than that of the rest of the employees), and limit the ability of the HCE's to deposit money into 401k, based on the deposits made by the rest of the employees. Basically it means that while the overall maximum is indeed 17K, your personal (and other HCE's in your company) is lowered down because those who are not HCE's in the company don't deposit to 401k enough. You can read more details and technical explanation about the HCE rules in this article and in this blog post.