Background Check / Dates of Employment Wrong

Do you have W-2 Form; that will show date you left.
I'd call HR and tell them you just discovered a mistake on your application and want to correct it.

 

Yeah I would do what Chinatown said. It's better if you find it before them. Start looking through your tax records for W2 or tax forms that show you were working for that old company at least in the year you said. To verify my employment at a company bought by a bigger company I tracked down an old office employee, and just coincidentally had some company letterhead. I got her to verify my employment with the old company using the dates I gave her. That company didn't report to DAC so I had a blackhole of 2 years otherwise. Now, I always keep my first and last paystub, and it never hurts to find company letterhead while you work somewhere.

 

Ill 2nd the comments above, pay stubs and w2's. But dot should have your records as well, what is you dac showing?

 

Easy enough to get a Neat Scanner or Apps to scan all your documents.

 

You can also just get a tax transcript from the IRS which basically is a run down of your tax return for those years. It helps from having to dig through files and find all of the years that you worked there. You can request them clicking --- TAX TRANSCRIPT

A lot of companies will accept this in replacement of verified experience as this verifies it on your end.