Procedures in accomplishing the BIR Form No. 1604CF
Steps
Hint: Use tab to move to the next enterable field
1
Indicate the period for Item 1 by supplying data in For the year field. This field is pre-populated or defaulted to the previous year.
2
Item 2 is predetermined by the system depending on the supplied month & year in item 1.
3
Item 3 is predetermined by the system depending on the no. of sheets attached.
4
Modify the default value in Item 11 to indicate if the refund has been released if there was an overwithholding. If yes is supplied, the following will become mandatory: a) If yes, specify the date of refund field b) Total Amount of Overremittance on Tax Withheld under Compensation (item 12) c) Month of First Crediting of Overremittance (item 13).
5
Indicate category of withholding agent in item 14. This is a mandatory field.
6
If previous filing for 1601C, 1601F, 1602 and 1603 were done through eFPS, some or all of the data will be populated by values obtained from the database. Fill up the other fields as necessary. Grayed our columns/fields will be either automatically computed on filling up of required fields or clicking of validate button.
7
The taxpayer can now attach supplementary documents by clicking on the Add Attachment button. A separate window will be displayed to facilitate the process. Attachments are done on a per file basis. 

Please note that the system currently accept files of the following format only: *.zip, *.xls, *.dat, *.csv. The taxpayer will be prompted if the file is not a valid format.

We do suggest that you upload your files in zip format to shorten the process.

8
Press or Click the Validate Button.
9
The system will prompt you if there is any problem with the supplied information, and correct this accordingly. After the necessary correction, you may again validate the return form by repeating Step 8. 
10
Review the data you have just encoded then click on verify to have an automated validation process. The taxpayer will be prompted if any problems were encountered. Otherwise, a successful validation will enable the Submit button. 
11
If you want to edit some input fields you may do this by clicking the Edit Button located on the bottom of the page. Or, if you are already satisfied with the result and all the information is correct you may already submit this by clicking the Submit Button beside the Edit Button. 
12
A reference number will be given by the system for filed tax return.