Understanding Assurance and Advisory Services for Nonprofit Organizations

Nonprofit organizations often need more than basic accounting support. Depending on their size, funding sources and reporting obligations, they may need a mix of assurance and advisory services that helps them maintain compliance, improve financial transparency and support long-term sustainability.

Whether your nonprofit organization is established and growing or simply trying to strengthen its financial foundation, understanding the difference between an audit, a review, a compilation and other nonprofit accounting services can make it easier to choose the right path. It can also help board members and leadership teams make informed decisions that support the organization’s mission without overspending on services they may not need.

Choosing the Right Service for Your Organization

The right solution depends on your organization’s goals, reporting responsibilities and internal capacity. A thriving organization with multiple programs, complex revenue sources or expanding operations may need annual audits, stronger compliance support and broader advisory services, while a smaller charity may only need compiled financial statements or outsourced nonprofit accounting services.

Organizations should also think about stakeholder expectations. Donors, board members, funding agencies and lenders may all want different levels of visibility into your accounting and reporting practices. If your leadership team is also reexamining governance responsibilities, resources like Best Practices for Running an Effective Nonprofit Board can provide additional context for how board oversight and financial reporting work together.

Audit: The Highest Level of Assurance

An audit is the most comprehensive financial statement service available and provides the highest level of assurance to lenders, grantors, donors and other stakeholders. During the audit process, accountants perform extensive procedures to obtain evidence that financial statements are fairly presented in accordance with the applicable accounting framework.

For many nonprofit organizations, annual audits do more than satisfy a requirement. They can also provide confidence to donors and funding agencies, strengthen financial transparency and help leadership identify areas where controls or reporting processes may need improvement.

When an Audit May Be Required

Some organizations pursue audits voluntarily, but others must complete them because of lender agreements, grant terms, government funding arrangements or regulatory expectations. Nonprofits receiving substantial federal assistance may also be subject to Uniform Guidance requirements and other related regulations.

Even when an audit isn’t technically required, it may still make sense for an organization experiencing growth, leadership transitions or increased scrutiny from donors or board members. In that setting, reviewing guidance like Invited to Sit on a Nonprofit Board? helps connect overall financial oversight directly with board‑level responsibilities and expectations.

Review: Limited Assurance With Reduced Cost and Complexity

A review engagement sits between an audit and a compilation. It’s less extensive than an audit and relies primarily on analytical procedures and inquiries of management rather than detailed testing of transactions and account balances.

As a result, the accountant provides limited assurance that no material modifications are needed for the financial statements to conform with the relevant accounting principles. Reviews can work well for nonprofit organizations that need outside credibility for lenders or grantors but don’t need the deeper testing that comes with a full audit.

Compilation: Basic Financial Statement Presentation

A compilation is the most basic level of financial statement service. In this type of engagement, the accountant helps management present financial information in financial statement form but doesn’t verify the data or provide assurance.

Compiled financial statements can still be useful, especially for smaller or developing nonprofit organizations that need clear, organized reporting for internal use, board communication or early donor conversations. For these groups, a compilation may be an appropriate first step before moving into more formal assurance services later on.

Agreed-Upon Procedures: Testing Specific Areas of Concern

Sometimes a nonprofit doesn’t need assurance over its full financial statements. Instead, it may want an outside professional to test one specific area, such as cash receipts, disbursements, grant expenditures or compliance with a particular funding requirement.

That’s where agreed‑upon procedures can be helpful. Rather than offering an opinion, the accountant reports factual findings based on the exact procedures requested. This can be especially useful when donors, grantors or board members want added visibility into a defined area without the cost or scope of a full audit.

When agreed‑upon procedures may help

Agreed-upon procedures may help with:

• Grant‑funded programs with specific reporting or compliance concerns
• New revenue streams, complex gifts or unusual financial transactions
• Targeted questions around cash handling, disbursements or internal processes

Internal Control Studies: Strengthening Financial Processes

Strong internal controls are essential to protecting assets, reducing risk and supporting accurate accounting. An internal control study provides a closer look at an organization's financial procedures and accounting workflows so that leadership can identify weaknesses, improve efficiency and better align with current regulations.

The recommendations that come out of this work may involve segregation of duties, approval workflows, policy updates or reporting improvements. If a nonprofit is also trying to improve day‑to‑day accounting execution, learning from How to Achieve a High‑Functioning Accounting Team at Your Nonprofit expands directly on the operational side of building a stronger finance function.

IRS Form 990 Preparation and Compliance Support IRS

Form 990 is one of the most visible public-facing documents a nonprofit organization produces. Because it’s available to donors, watchdog groups and the public, accuracy matters not just for compliance but also for reputation and financial transparency.

Professional preparation support can help organizations comply with filing requirements while also improving the quality of their disclosures and overall reporting. For many nonprofits, Form 990 preparation isn’t just an annual submission — it’s an opportunity to better communicate mission, governance and financial stewardship.

Form 990: More than a tax form

The Form 990 process involves five key steps, from gathering information to sharing the final return with stakeholders:

1. Gather data – Collect complete financial and governance information.
2. Draft return – Prepare the return to meet technical IRS requirements.
3. Review disclosures – Verify narrative disclosures for accuracy and transparency.
4. Finalize and file – Authorize and submit the official annual submission.
5. Share with stakeholders – Present a clear, transparent financial picture to donors and board members.

Beyond Assurance Services: Additional Support for Nonprofits

Many nonprofit organizations need support that extends beyond audits, reviews and compilations. Depending on the organization’s needs, this may include payroll support, strategic planning, tax services, employee benefit plan audits, board training or outsourced nonprofit accounting services.

For organizations managing significant reserve funds or endowments, nonprofit institutional investment consulting supports investment governance, performance reporting, board education and donor-related strategy. Broader business services can also help nonprofit leaders manage accounting, audit, payroll, legal and other operational demands through a unified support model.

Building a Stronger Financial Foundation

Audits, reviews and compilations each serve a distinct purpose, while agreed-upon procedures and internal control studies fill critical gaps when targeted insight is needed. The right mix depends entirely on your organization’s mission, complexity, stakeholders and reporting obligations.

When nonprofit organizations align their assurance and advisory services with governance, accounting and long-term strategy, they’re better positioned to build long-term sustainability and make informed decisions.

Frequently Asked Questions

Do all nonprofit organizations need an audit?

No. Some nonprofit organizations require annual audits due to lender, grantor or legal/regulatory requirements, while others may only need a review or compilation based on their size and stakeholder needs.

What is the main difference between an audit and a review?

An audit provides the highest level of assurance through extensive testing of details and internal controls. A review provides limited assurance, relying primarily on analytical procedures and management inquiries at a lower cost.

Can outsourced nonprofit accounting services help with compliance?

Yes. Outsourced nonprofit accounting services can help organizations improve ongoing reporting, strengthen day‑to‑day accounting processes, enforce internal controls and streamline preparation for audits and filings like Form 990.