Online individual tax declaration special item additional deduction method, device and equipment

The invention discloses an online individual tax declaration special item additional deduction method. the method includes acquiring declaration request for additional deduction of an individual tax special item; Creating electronic contracts, obtaining a common responsible person set by a taxpayer, prompting the taxpayer to fill in deduction distribution of the taxpayer and the common responsibleperson in an electronic contract, finally sending the filled electronic contract to a signer for signing, and sending the signed electronic contract to a tax authority or an enterprise unit so as tocomplete declaration. Therefore, the method can prompt the taxpayer to set a common responsible person and prompt the taxpayer to fill in the deduction distribution in the process of declaring the additional deduction of the individual tax special item, and finally carries out declaration according to the information filled by the taxpayer, thereby meeting the requirement that multiple persons ofthe taxpayer declare to dec