The Critical Role of Supporting Documentation in Expense Management

A professional headshot of Roberta Katz, a nonprofit finance consultant at Roberta Katz Consulting

By Roberta Katz

June 9, 2026

Supporting documentation that should be retained in the following categories include, but are not limited to:

  • Vendor invoices
  • Consultant contracts
  • Employee expense reimbursement reports
  • Cancelled checks/electronic payment confirmations
  • Bank and credit card statements
  • Purchase requisitions
  • Purchase orders
  • Proof of delivery
  • Vendor invoices
  • Contracts
  • Bank statements and reports
  • Bank deposit slips
  • Donor letters received with contributions
  • Funder payment confirmation
  • Time sheets
  • Electronic time and attendance reports
  • New hire authorization forms
  • Pay rate authorization forms

Roberta Katz Consulting
www.rpkatzconsulting.com
robertapkatz@gmail.com
917.359.1158