I’m sure an expert will be along shortly, and I’m doing this purely from memory, but in the meantime:
My understanding is that a 401(k) is employer-provided, tax-deferred investment scheme in which the employee puts up most of the equity and the employer matches at least some of the employee contribution, with contributions made monthly as a percentage of the employee’s salary. A Plan Adminstrator usually manages the company’s 401(k) program. An IRA, which stands for Individual Retirement Account is a tax-deferred account that can be created for any individual, and provides an option for the saving of retirement funs for the self-employed or those without a pension or 401(k). Contributions can be made monthly, yearly or on an irregular basis.
Most 401(k)s I’ve seen consist of a basket of several money-market (interest-bearing) and mutual (equity-based) funds, plus maybe company stock, and the employee can decide how to distribute the monthly contributions. IRAs tend to be conventional money-market-type accounts, although equity-based IRAs are available as well.
Last I checked, the maximum was about $16K/year, but I’m not sure that’s correct.
Generally a company will have a pension fun or a 401(k), but not both.
You can certainly carry a 401(k) and multiple IRA accounts, with the total yearly tax-deferred contribution limited as mentioned above. I don’t know if there’s a specific rule on this, but in most cases you are only likely to be able to contribute to one 401(k) at a time, although you could have additional accounts to which you are not currently contributing. See below.
AFAIK, 401(k)s are obtained only through an employer.
Below a certain total contribution, you must close the account if you leave the employer, the funds remain tax-deferred if you roll them into an IRA or the 401(k) of a new employer. Above the total, if you leave the employer you can no longer contribute to the fund, but the existing balance will continue to accumulate interest and/or capital gains.
Yes, but in addition to the ordinary tax on the withdrawn amount there is a penalty; IIRC, the penalty is 10% of the principal withdrawn.
For a first-time home buy, you can withdraw up to $10,000 without incurring the penalty, but (I think) you must still pay tax on the withdrawn amount. I believe there is also a provision for medical emergencies. Some 401(k) administrators also allow loans from the account.
You can start pulling the money from a 401(k) or IRA after age 59 1/2 without penalty; the moneys withdrawn will be taxed as ordinary income. After age 70, I believe, you must withdraw a certain percentage amount per year.