The normal approach is to keep copies in a format that isn't dependent on specific tax software, and the IRS only has a few years to audit you or ask for more m

The normal approach is to keep copies in a format that isn't dependent on specific tax software, and the IRS only has a few years to audit you or ask for more money. I was undergoing a ten year background check once where I had to certify no government debts, and found a small underpayment (W-2 that the IRS had but I never received) and they wouldn't take my money. I think worrying about open source in this context is optimizing entirely the wrong thing. If you keep things simple, then at worst, you'd have to copy your printout onto the forms for an amended return by hand, and that wouldn't be too onerous.