For non-HSA benefits, if you make a mistake on a contributions file, you can send another contributions file with a negative amount to correct the total contributions. Note that you may receive an error if employees have spent or moved those funds out of the account (applicable to payroll-funded accounts) because the correction will make the employee's account balance negative. For FSA and LPFSA, you can correct the contributions at any time.
For HSAs, Forma does NOT accept negative contributions through files. For HSA contribution corrections, please reach out to our Customer Operations Team at support@joinforma.zendesk.com. We will require formal consent (not through files) before removing the HSA funds.