If Phil has been relying on a payment plan five years in a row, whether it's because of Champions or not, it WILL be from this point forward, so it seems a foregone conclusion that him reaching a tax debt that rivals his gacha spending is inevitable. He's not paying enough per month to keep it from climbing year after year, because if he could do that, he wouldn't be having this problem to begin with.
Whether or not that will result in the IRS crawling up his ass, who knows, but with his financial situation being dictated by an addiction he refuses to address, I don't see how he could avoid his debt piling up to ridiculous levels in another decade. Then again, the most unprecedented scenario in my view isn't him pigroaching his way out of things, it's him ceasing to be a pigroach by actually relenting on his shitty ways for once. That's what it will take, given what got him here.