@Izanagi if di na makakapag provide ang previous company - alamin mo nalang kung saang branch sila nag fifile ng tax.
Response ito sakin from BIR.
If you need ITR - they recommend na tumawag to verify some important details as validation of your identity bago sila mag process.
Dear Sir/Madam:
Greetings!
Thank you for communicating with the BIR – Customer Assistance Division.
In reply, your previous employer will be providing you the BIR form 2316,
that serves as your ITR for the taxable year. If the BIR form 2316 is not
available you may submit a written request to the Revenue District Office
(RDO) where you filed your Income Tax Return (ITR) stating therein the
purpose of your request.
For other inquiries, you may visit www.bir.gov.ph or you may give us a call
at these numbers 981-7003 / 981-7020 / 981-7040 / 981-7046 / 981-7030. We
appreciate your continued support.
Sincerely,
The BIR - Customer Assistance Division
E-mail: contact_us@bir.gov.ph