Sorry hand written tax returns are never accepted as proof of income. I am also self employed. Tax transcripts or some places will accept professionaly prepaared return. Which means the section with the name of agency and professional licnese of the tax preparer. Since I also do my own returns I always download a transcript as soon as its available and store it for future use. Transcripts are usually available online 3-4 weeks after your return has been accepted. Longer durring tax season.
Here is info on availability:
https://www.irs.gov/individuals/transcript-availability
Link to request them
https://www.irs.gov/individuals/get-transcript
