Yes, for 2017 the limit is 18k . But it’s worth noting for those that may not know how a 401k works (I’m not suggesting that’s you) - it’s not “tax free”, it’s just deferred until withdrawn (for a traditional 401k, there is also a Roth variant like IRAs).

$18k is the limit for individual contribution. Employers have a separate contribution limit, I think around $55k. So they can freely give each employee $55k worth of cash or stock and that employee can freely contribute an additional $18k of their own money.

But, yes, as pointed out, you do pay taxes, but ONLY when withdraw from it, which you can do without a penalty when you reach a certain age. The capital gains are tax free. But I was saying distributing stock into a 401k is not a taxable event, not that you'd never pay taxes.

It's not abusive to fill up your 401k, that's what it is there for.