Energy Credit - Windows. Can I include the state tax in the cost of the windows or not? Thank you

[ChrisJ]

You can claim a tax credit of 10% of the cost of materials that meet or exceed the Energy Star Version 6.0 program requirements, up to a maximum of $500, for your energy efficient exterior and storm windows and doors.

You can’t deduct labor and installation costs, however.

Exterior windows and skylights must meet certain energy efficiency requirements to qualify. 

• Go to Federal Taxes - Deductions & Credits 
• Go to Start for Home Energy Credits
• When asked 'How much did you pay for energy-saving improvements?', enter the amounts you paid in the Exterior Doors and Exterior Windows fields. Skylights are considered to be windows.