Round Off Decimal Values of Currency Fields in the Salesforce UI and API

When you create a custom currency field and define the number of decimal places (for example, 2 decimal places), Salesforce applies rounding only in the user interface. The full precision value is still stored in the Salesforce database.

Behavior in the Salesforce User Interface (UI)

If a user enters a value such as $1.234 into a currency field configured for 2 decimal places, the UI displays $1.23 after saving. However, if the user re-edits the field, the full value ($1.234) is shown. This rounding is purely visual and does not affect the stored value.

Behavior via API (REST API, Apex, Data Loader)

Salesforce does not round values provided through the API (Application Programming Interface). The Salesforce API refers to the programmatic interfaces — such as the REST API, Apex code, and the Apex Data Loader — that allow external systems to read and write Salesforce data. If you insert or update a value such as $1.234 via the API, it is stored exactly as entered, regardless of the field's decimal setting.
For example, if your integration sends $1.2345 via the REST API to a field configured for 2 decimal places, Salesforce stores $1.2345 — not $1.23. To prevent downstream calculation issues, round the value before sending it to Salesforce.
This behavior is intentional and ensures backward compatibility with external systems and integrations. If consistent rounding is required across both UI and API, it must be handled explicitly in code or integration logic.