Profile → Delete account. It removes your login, receipt records, and stored files permanently. Export first — deletion cannot be undone.
Profile → Delete account. You'll confirm once, then everything goes:
This is permanent. There's no recovery window and no support ticket that can undo it.
Export first. Deleting an account should not mean losing decades of substantiation for withdrawals you've already taken — those records still matter to the IRS even after you stop using this service.
If you only want to stop being billed, cancel instead. Deletion is for when you want the data gone.