A taxpayer who failed to claim the depreciation deduction in prior years may correct this by 1) filing amended returns for all open years when thr incorrect amount was claimed. 2) filing Form 3115 Application doe Chang in Accounting System 3) Including the unclaimed depreciation as Other Depreciatin on lne 16 of Form 4562, Deprecition and Amorization, in the current year. 4) Increasing the basis of the property by the amunt of dereciation that could have been claimed