Use this form to provide information on timber accounts when a sale or deemed sale under Internal Revenue Code sections 631(a), 631(b), or other exchange has occurred during the tax year. Current Revision Form T (Timber) PDF Instructions for Form T (Timber) (Print Version PDF) Recent Developments None at this time. Other Items You May Find Useful All Form T (Timber) Revisions About Publication 225, Farmer's Tax Guide About Publication 535, Business Expenses About Publication 544, Sales and Other Dispositions of Assets Other Current Products Related About Form 4562, Depreciation and Amortization (Including Information on Listed Property) About Form 4797, Sales of Business Property