Can I have an IRA and also a 401K plan at the sametime?

I am planning on getting a Traditional IRA plan so I can put away $4000 tax free for this year. However, my company may possibly introduce a 401K plan soon.

If I invest $4000 in an IRA account this year, and if my company introduces a 401K plan a little later this year, am I allowed to contribute to both IRA & 401K plans in the same year?

FYI, my filing status is married filing jointly and my wife has a 401K plan at her work place.

Would appreciate any guidance here. Thanks.

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