If you are considering replacing your windows, you might qualify for an energy tax credit of up to $1500 as detailed in The American Recovery and Reinvestment Act of 2009. The windows must qualify as being energy-efficient and the residence where you replace the windows must be your principal residence, which means you must reside in it.
Prior to replacing your windows, visit Energystar.gov or contact the IRS to find out what windows will qualify as being energy-efficient.
Once you purchase your energy-efficient replacement windows, keep all receipts related to the purchase and installation of your windows. This includes any labor costs.
Keep your manufacturer's certification statement that verifies that your windows qualify as energy efficient. If it did not come with the purchase, you can find it online. The IRS may request to see it once you file your taxes.
Download IRS Form 5695 and fill it out. If you have any questions, contact the IRS or a tax professional.
Go back to Energystar.gov to see if you qualify for any additional rewards for purchasing an energy-efficient product. Rewards may include tax exemptions, credits or rebates.
Tax laws frequently change, so be sure you have the most updated IRS information about tax credits.