Instead of guessing, the best way is to ask your hu*****and to show you the return before mailing it out, if he refuses then I say you got a serious problem.
you can also ask him to show you his w2 from last year, he should have a copy, from there it is not difficult to figured out whether the 1k claim is right.
you can also ask him to show you his w2 from last year, he should have a copy, from there it is not difficult to figured out whether the 1k claim is right.