Nonprofit Audit Evidence Binder: What to Include and How to Organize

The audit evidence binder is where preparation meets execution. Everything your organization has done throughout the year — coding expenditures correctly, maintaining time records, filing grant reports on time — either shows up cleanly in the binder or reveals itself as a gap that now has to be explained. Organizations that maintain their records well produce binders that practically assemble themselves. Organizations that let record maintenance slide spend the weeks before fieldwork in a documentation sprint.

What a PBC Binder Is and Why It Matters

PBC stands for “prepared by client.” Auditors arrive at fieldwork expecting a set of schedules, reports, and supporting documents to already be prepared and organized. The PBC list they provide before fieldwork is a specific menu of what they need; the binder is your response to that menu.

An audit conducted with a complete, organized PBC response is faster, less expensive (fewer auditor hours spent chasing documents), and less disruptive to your staff. An audit conducted with an incomplete response that generates dozens of follow-up requests wastes everyone’s time and often results in additional testing of areas where documentation gaps are concentrated.

Beyond efficiency, the quality of the PBC binder signals something about the organization’s financial management competence. A well-organized binder covering all requested items accurately tells the auditor that the finance function operates with rigor year-round. A disorganized or incomplete binder tells a different story — and auditors respond by being more thorough, not less.

Standard Sections of a Nonprofit Audit Evidence Binder

Section 1: Financial Statements and General Ledger

• Draft financial statements for the audit period (or the most current version)
• General ledger for the entire audit period — not summarized; full transaction detail
• Trial balance as of year-end
• Chart of accounts

The general ledger is the most extensively used document in the audit. Auditors review it to identify large and unusual transactions, to trace specific amounts to supporting documentation, and to verify that accounts are classified consistently. Make sure the general ledger is exported in a format auditors can sort and filter — a PDF is adequate, an Excel export is better.

Section 2: Bank and Investment Accounts

• Bank statements for all accounts for all months in the audit period
• Bank reconciliations for all accounts for each month
• Investment account statements for all periods
• Signed bank confirmations (if your auditor requests them separately from their direct confirmation process)

Bank reconciliations must be signed and dated to demonstrate they were prepared contemporaneously, not assembled for the audit. A batch of reconciliations all dated the same day — the week before audit fieldwork — is a red flag.

Section 3: Revenue and Contribution Documentation

• List of all contributions received during the year with donor name, date, amount, and restriction status
• Grant award letters and agreements for all active grants
• Acknowledgment letters sent to donors
• Pledge agreements for multi-year pledges
• Documentation of any contribution restrictions (gift letters, grant agreements)

For restricted contributions, auditors verify that amounts recorded as restricted match the terms of the underlying documents. Have the grant agreements tabbed and accessible.

Section 4: Grant Files (for Single Audit)

For each major federal program under a single audit, a separate, organized grant file containing:

• Notice of award and all amendments
• Budget-vs-actual report for the grant period
• All SF-425 financial reports submitted
• All programmatic reports submitted
• Time and effort records for all federally funded staff
• Documentation supporting major expenditures
• Subrecipient agreements and monitoring records (if applicable)
• Procurement records for contracts above the micro-purchase threshold

This is the section that takes the most preparation time and that drives the most single audit findings when it is inadequate.

Section 5: Payroll and Personnel

• Payroll registers for all pay periods in the audit year
• Quarterly federal payroll tax returns (Form 941)
• Annual W-2 summary
• Employee benefit plan documentation (if applicable)
• Time and effort records for employees charging time to federal grants
• Effort certifications signed by employees or supervisors

Payroll is consistently one of the highest-risk areas in nonprofit audits because personnel costs are typically the largest expense category and because time and effort documentation is frequently inadequate. Allocate significant preparation time to this section.

Section 6: Accounts Payable and Major Expenses

• Accounts payable aging as of year-end
• Support documentation (invoices, contracts, receipts) for major expenditures
• Documentation for any accrued liabilities
• Vendor contracts for significant ongoing service providers

Auditors typically test a sample of expense transactions. Having invoices organized by vendor and by period — not in a single pile — significantly reduces the time needed for this testing.

Section 7: Fixed Assets

• Fixed asset schedule as of year-end showing beginning balance, additions, disposals, and ending balance by asset category
• Support documentation for all asset additions during the year (invoices, purchase records)
• Depreciation calculation with method and useful life by asset
• Documentation for any asset disposals (sale proceeds, disposition records)

For federal grants, the fixed asset schedule should also identify which assets were purchased with federal funds, since those are subject to federal property management requirements.

Section 8: Board and Governance

• Board meeting minutes for all meetings during the audit year
• Approved budget for the audit year
• Organizational chart
• List of board members and officers
• Conflict of interest disclosures or certification forms
• Key organizational policies (procurement, time and effort, capitalization threshold, conflict of interest, whistleblower)

Board minutes are reviewed by auditors to verify that significant transactions were authorized, that the budget was approved, that there are no undisclosed contingencies, and that governance functioned appropriately during the year.

Section 9: Prior Year and IRS

• Signed copy of prior year audited financial statements
• IRS Form 990 for the most recently filed year
• Prior year management letter from auditors (if any)
• Status of any prior year audit findings or management letter items

Auditors review prior year findings to determine whether they have been resolved. Unresolved findings from the prior year receive additional attention in the current year audit.

Digital vs Paper Binders

Digital binders are standard practice for most audits today. Most audit firms have secure portals where PBC items are uploaded and accessed during fieldwork. Digital organization requires:

• Consistent file naming (Grant_Name_Document_Type_Date rather than “document1.pdf”)
• Folder structure that mirrors the binder sections above
• PDF format for final documents; Excel format for schedules that auditors will work with directly
• Version control — if you update a schedule after initial upload, clearly label the revision

Paper binders are still used in some engagements. If working with paper, use tabbed dividers corresponding to the section structure above, a table of contents, and clear labels on each document. Page-number the binder if feasible.

The format matters less than the completeness and organization. A well-organized digital folder is better than a disorganized paper binder, and vice versa.