score:8
The OV-chipkaart website lets you review the travel history for a given card, you can then select which trips to include and which to exclude and generate a PDF document listing those trips and their costs.
The bad part is that if you have an anonymous OV-chipkaart, the Belastingdienst (Dutch tax office) supposedly does not accept this PDF as a tax invoice (perhaps because there's no way to make sure the history belongs to an employee of a given company). At least the generated PDF says so; depending on how strict the accountants at your company are, they might or might not care.
With a personal OV-chip, just generating the PDF and handing that over to the employer has always worked fine for me.