Field help: (2021) Date of invoice This text refers to the Online Steuererklärung 2021. You can find the version for the Steuererklärung 2025 at: (2025): Date of invoice Enter the invoice date on which the maintenance expenses were incurred.Deductible maintenance expenses include:Replacement of windowsReplacement of doorsRenewal of heatingElectrical installationTradesman's billRoof renovationNew house paintingNew floor coveringNew wall tilesNew floor tilesBathroom renovationOther cosmetic repairs