So, I just received my paycheck, but....I need help!!?

Okay, well heres the thing. I get paid by salary $1200, my check usually comes out for $945, I've had it as "single" and 1 dep. however I've been married for 3 months or so, and I barely remembered about the "single" part, so i asked to change it, so now its married and 1 dep. my check came out for $1000, and my husbands check came out for around $300 more, he too has married and 1 dep. will this affect us, when we have to do our taxes? Since its only us, will we have to pay alot? thank you.