Form 8829 - Business Use of Home - Multiple Additions or Improvements
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The TaxAct program will automatically create Form 4562 if the date of the improvement entered on Form 8829 is in the current tax year. TaxAct supports only one addition/improvement for Federal Form 8829. If you have more than one addition/improvement, you can still file your return with TaxAct, however you will need to file a paper return (if you print Form 8829, Form 4562 will also print). 
Also see the IRS Instructions for Form 8829.