Which form has to fill up for ids?

Form No 1 (IDS2016) you can do it online

how??

As per Income Declaration Scheme, 2016, the declaration of undisclosed income is to be filed using Form for Income Disclosure - Form 1. As per Notification No. 33/2016, the other Forms accompanying Form for Income Disclosure - Form 1 are Form 2, Form 3 and Form 4.

Form 2 is an Acknowledgement issued to the declarant by the jurisdictional Principal Commissioner or Commissioner.

Form 3 shall be furnished by the declarant to the jurisdictional Principal Commissioner or Commissioner for the proof of payment of tax, surcharge and penalty made after receiving Form-2.

Form 4 is a Certificate granted by the jurisdictional Principal Commissioner or Commissioner after submission of Form 3.

For filing on line can follow the following procedure:

To upload Form for Income Disclosure - Form 1, user should have a valid PAN and should be registered in e-Filing portal. 

A valid XML file should be generated using the JAVA Utility available under downloads. The JAVA utility of Form 1 can be downloaded from the path Downloads 

Forms (Other than ITR)  Form 1. Start Form 1 – Assessee will upload Form 2 – CIT will issue Form 3 – Assessee will upload Form 4 – CIT will issue End Manually CIT will Upload Manual filing of Form 1 Electronically Form 1 (Income Declaration Scheme, 2016) - User Manual Page 4 

A valid XML can be generated by following the process, Extract the JAVA Utility of Form 1  Right click and Open the JAR file of Form 1 (Income Declaration Scheme, 2016) 

Fill all the Mandatory fields  Click on “Generate XML”.  Form 1 (Income Declaration Scheme, 2016) can be uploaded using either DSC or EVC. If the user opts to use the DSC facility, a valid DSC should be registered in e-Filing portal for uploading Form 1 (Income Declaration Scheme, 2016).