CP15H

A CP15H says a shared responsibility payment — the old health-coverage payment — was recalculated because your income tax liability changed, usually after an examination whose results arrive separately. It's an arithmetic consequence, not a new accusation.

“Because your tax liability changed, the shared responsibility payment changed with it. Here's the new amount and due date. Pay it or set up a plan; call with your paperwork ready if you disagree.”

Interest accrues past the printed date. Like other shared-responsibility amounts, the underlying payment carries unusual collection limits — worth understanding before treating this as an emergency.

• The notice
• The examination correspondence that changed the underlying liability
• The affected year's return and coverage records
• Canceled checks or records if you believe it's already paid

• Recomputing the figure — a recalculation of a recalculation deserves checking
• Contesting it alongside the examination results it flows from
• Payment arrangements when it stands
• Advising on the real collection exposure, which is narrower than most balances