Important Reminder Deferred payment (installment) sales and alternative minimumtax (AMT).For tax years beginning after December 31, 1986, the installmentmethod is allowed for both the regular tax and the AMT for deferredpayment sales of property used or produced in a farming business andheld primarily for sale to customers. You may choose to begin applyingthe installment method for the AMT to sales entered into in the 1999tax year. No adjustment should be made on Form 6251 for these sales.Any income you reported in 1999 for regular tax purposes from a prioryear installment sale, and that was reported for AMT purposes in aprior tax year, should be reported as a negative amount on Form 6251.Alternatively, if you wish to make this change in a prior tax year,you may file Form 1040X, Amended U.S. Individual Income TaxReturn, to amend the return for any earlier open tax year afterwhich there is no closed tax year. If you choose to file an amended return to take advantage of theretroactive change, you should not apply the installment method forthe AMT to sales entered into prior to the earliest tax year for whichyou are filing an amended return. You should apply the installmentmethod for the AMT only to installment sales entered into in theearliest tax year for which you are filing an amended return and allsubsequent tax years. You should report as a negative AMT adjustmenton the earliest year amended return any income reported in such taxyear for regular tax purposes from an installment sale that wasreported in an earlier tax year for AMT purposes. No adjustment shouldbe made for any tax year subsequent to the earliest year for which anamended return was filed. Additionally, if you file an amended return,you must recalculate the AMT credit earned for the year.