The personal information of 143 million Americans may have been accessed by criminals in a cybersecurity incident involving one of the three credit reporting agencies, Equifax. Here's how to find out if you were impacted and what to do.

Hlib Shabashnyi, Thinkstock

Equifax has set up a tool to determine whether or not your personal financial information was indeed compromised.

Once you go to the secure link from Equifax (I verified its safety) you simply enter some information and click "CHECK POTENTIAL IMPACT."

I went through the process, and it turns out my records were impacted. While I haven't noticed any unusual activity, it's good to know so I can check. Even better, Equifax will provide you with a free identity theft and credit score monitoring. As you will see below, they give you a very small window for free enrollment.

Matt Ryan, Townsquare Media

My advice if your information was compromised and you get offered the free service, set a reminder on your phone to sign up on the day you're designated.

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