There’s just no escaping the taxman.

Christian Lopez got little for giving up Derek Jeter’s 3,000th-hit ball — some Yankee tickets, some signed balls and such.

Yet before the guy could even start enjoying his modest reward, he got the bad news: His noble act might land him a hefty tax bill from Uncle Sam — perhaps as much as $14,000 — based on the gratuities he got from the team.

Even as he was already facing more than 100 grand in college loans.

Unfair? Seems more than a few folks thought so.

New York sports-equipment chain Modell’s, for example, was quick to act.

Its CEO, Mitch Modell, declared July 13-19 “Christian Lopez Week,” during which 5 percent of all Yankee-related goods sold at his stores would go to help the Bomber fan pay his tax and loan bills.

Miller Beer says it, too, will chip in to defray any tax hit.

All quite commendable. Just one problem: All that help may also be taxable.

With taxes, you see, not even followup good deeds go unpunished.