1040 vs w2 - Please Help!!!

[Jasmine Claye]

I am in the process of getting approved for a mortgage. My w2 income does not match the income on my 1040 form. The 1040 income is less than the w2. Is this something that they underwriter will question? Or will the underwriter just assume that I did not report all of my w2 income when I filed the 1040 with IRS. The w2 is from a job which I am no longer employed. Since this job, I have been employed at another company in the same job industry for 1 yr. My current job's income from last yr. was also not reported on my 1040. But this is because I had only worked there for 2 months before filing tax return. Are there any potential serious here?