Deductions & credits

The credit for the doors and windows is separate.  So you would enter the total amount you paid for the 2 windows in the window box and the amount you paid for each door in 2 separate boxes.  One box will say most expensive exterior door and the other box will say all other doors.  But, the total credit for the doors will be $500 ($250 per door maximum of 2 doors) assuming each door cost about $834 or more per door. The maximum amount for all windows combined for windows is $600. 

The Home Improvement Energy Efficient Credit is a non-refundable credit

• Worth up to 30% of costs with a maximum credit $2,000 for
  • Air source heat pumps
  • Heat Pump Water Heaters
  • Biomass Stoves or Boilers
• Worth up to 30% of qualifying costs for a maximum combined total of $1,200 for the following:
  • Doors, Windows and Skylights
  • Insulation
  • Natural Gas, Oil Propane Water Heaters
  • Furnaces
  • Boilers
  • Central Air Conditioners ($600 maximum Credit)
  • Electrical Panel Upgrades
  • Home Energy Audit (up to $150)
• You can combine the $2,000 credit with the $1,200 credit for a total of $3,200
• This credit is a use it or lose it credit.  If you do have enough tax liability in the year you buy and install the item, you will not be able to carry the credit forward.
• NOT available for new construction.