My SSA-1099 has workers compensation offset on it. Workers compensation is non taxable. So where can I make a deduction for that on my tax's?

You do not get a deduction for the worker's compensation offset.

Enter on your income tax return:

• The amount in the PINK box shows the reportable amount paid by SSA. Ignore everything else.
• The IRS cross matches Box 5 on the SSA-1099 with your income tax return.

Per IRS Publication 525 Taxable and Nontaxable Income page 19 Workers' Compensation : 

• If you receive both Social Security Disability and Workers Compensation Benefits: Social Security Benefits are taxable to a certain extent. 
• If you receive both Social Security Disability Benefits and Workers Compensation, then Social Security may be reduced by a certain amount due to your receipt of Workers Compensation Benefits (you can only receive up to 80% of your pre-disability earnings form both sources, otherwise, Social Security reduces its benefits).
• The IRS tax you on the FULL amount of the Social Security Benefit, even if it has been reduced by Workers Compensation.

Additional information:

Social Security How Workers' Compensation and Other Disability Payments May Affect Your Benefits