if you have a family plan and only you have an HSA a/c the max you and your employer can contribute for 2019 is $8000. since your employer is putting in $1200 that means through salary reductions (your taxable wages are reduced) you can only put in $6800 or 566.67 per month. this is reflected in your W-2 because code W show's $8,000 (the 1200 the employer put in and the 6800 you put in through salary reductions). you do not enter any contributions that you put in through salary reductions on line 2 of the form. they're handled through code W on the W-2. for code W on the w-2 eliminate the .12 cents.
does your spouse have her own HSA a/c? there is no such thing as a joint a/c.
if she doesn't the entire $8000 will be reported on your 8889.
