My husband and I separated this year but are still married and filing joint should I put both of our new addresses down or does it matter that we live apart but file together

[Opus 17]

You should use your current mailing address.  I'm not sure if there is a place for the spouse to have a different mailing address.  Even if there is, the IRS will consider the address to be the first-named taxpayer (the top line on a paper return).  That's where the IRS will send any mail related to the this tax return.  While joint filing is usually better financially, the second or bottom named spouse may be at a disadvantage since they won't get mail related to any problems.

[Tnahinu]

Ok thank you, I would definitely use the current just wasn't sure if we had to out his and mine on it. I started it and it only lets you put one in so that's what I did : ) Thank you

[Opus 17]

Use the address where you want to get mail if the IRS has to contact you.