Couples who are separated, whether informally or legally, are still married in the eyes of the law, regardless of how independent their lives have become. This means that if either spouse has a sexual relationship with another person during the separation period, they have probably committed adultery.

How does the IRS know if youre married?

If your marital status changed during the last tax year, you may wonder if you need to pull out your marriage certificate to prove you got married. The answer to that is no. The IRS uses information from the Social Security Administration to verify taxpayer information.

What is the penalty for filing taxes separately when married?

And while theres no penalty for the married filing separately tax status, filing separately usually results in even higher taxes than filing jointly. For example, one of the big disadvantages of married filing separately is that there are many credits that neither spouse can claim when filing separately.