Picture this: your nonprofit files its Form 990 right on time, feels like a weight off your shoulders, and then three months later a letter from the IRS shows up asking for clarification. No one on your team did anything wrong on purpose, but something in the return raised a flag. This scenario plays out more often than most nonprofit leaders realize, and it’s rarely about intentional wrongdoing. It’s almost always about small, avoidable inconsistencies that snowball into bigger scrutiny.
With the IRS increasingly using data analytics to flag returns for review, understanding what actually draws attention has become essential knowledge for anyone responsible for nonprofit Form 990 filing. This isn’t a scare tactic. It’s a practical look at the specific patterns that tend to invite closer inspection, and how solid form 990 compliance practices keep your organization off that list in the first place.
Why the IRS Is Paying Closer Attention Now
Tax-exempt organizations have grown significantly in number over the past decade, but IRS enforcement resources haven’t grown at the same pace. To compensate, the agency has leaned heavily into automated screening tools that compare data points across a nonprofit’s own filings, prior-year returns, and even similar organizations in the same sector. A discrepancy that might have gone unnoticed a decade ago is now far more likely to surface.
This shift matters because it changes what “good” form 990 preparation actually looks like. It’s no longer just about filling out the form correctly. It’s about making sure everything lines up, year over year, across every schedule and every related filing.
Red Flag #1: Executive Compensation That Doesn’t Match Comparable Organizations
The IRS pays close attention to Part VII and Schedule J, which cover officer, director, and key employee compensation. If your organization’s leadership compensation looks unusually high relative to similarly sized nonprofits in the same sector, it can trigger a closer look, even when the compensation is entirely justified and properly documented.
The fix isn’t necessarily to underpay your leadership. It’s to make sure your board has conducted and documented a genuine comparability review, showing that compensation decisions were based on real market data rather than internal preference.
Red Flag #2: Unusually High Fundraising Costs Relative to Program Spending
Form 990 requires organizations to report expenses across three functional categories: program services, management and general, and fundraising. When fundraising costs consume an outsized share of total expenses compared to program spending, it can suggest inefficiency or, in some cases, prompt questions about whether donor funds are being used as represented.
Accurate functional expense allocation is one of the more technical aspects of form 990 reporting, and it’s an area where generic bookkeeping often falls short. Shared costs, like a staff member who splits time between program delivery and fundraising, need to be allocated thoughtfully and consistently.
Red Flag #3: Significant Year-Over-Year Swings With No Explanation
A sudden jump or drop in revenue, expenses, or net assets isn’t inherently a problem. Nonprofits experience real fluctuations, from a major one-time grant to an unexpected capital expense. The issue arises when those swings appear on the return without any accompanying narrative explanation in Schedule O.
Organizations that proactively explain unusual variances tend to face far less follow-up scrutiny than those that leave the IRS to guess.
Red Flag #4: Related-Party Transactions That Aren’t Fully Disclosed
Schedule L asks about transactions between the organization and its officers, directors, or their family members and businesses. Loans, business dealings, or shared vendor relationships involving insiders need full disclosure, even when the terms are fair and reasonable.
Incomplete answers here are one of the most common triggers for follow-up correspondence, largely because omissions look worse than disclosures, even when nothing improper occurred.
Red Flag #5: Mismatched Figures Between Form 990 and State Filings
Many nonprofits operate under the assumption that their federal Form 990 and their state charitable solicitation registration exist in separate silos. In practice, several states cross-reference this information, and so does the IRS in certain circumstances. When the revenue or expense figures reported to a state don’t match what’s reported federally, it creates an inconsistency that can be difficult to explain after the fact.
Reconciling these numbers before filing either document is a simple step that prevents a genuinely thorny problem down the road.
Red Flag #6: Governance Answers That Contradict Actual Practice
Part VI of Form 990 asks detailed questions about board oversight, conflict-of-interest policies, whistleblower policies, and document retention practices. It’s tempting to check the boxes that make the organization look most polished, but answers should reflect actual documented practice.
If your return states that the board reviews the Form 990 before filing, there should be minutes or correspondence showing that review actually happened. Gaps between stated policy and documented reality are exactly the kind of thing that undermines form 990 compliance during a closer review.
Red Flag #7: Repeated Late Filings or Extensions
A single extension is normal and rarely raises concern. A pattern of late filings year after year signals something different: potential organizational disorganization, or worse, a warning sign that the nonprofit’s Form 990 compliance program isn’t being taken seriously at the leadership level.
Given that three consecutive years of non-filing triggers automatic revocation of tax-exempt status, chronic lateness isn’t just a reputational risk. It’s an existential one for the organization.
Turning Red Flags Into a Proactive Compliance Checklist
The good news is that every one of these red flags is preventable with the right process in place. A few practices consistently separate organizations that sail through filing season from those that end up fielding IRS correspondence:
- Document everything as it happens. Compensation reviews, related-party disclosures, and board decisions should be recorded in real time, not reconstructed months later.
- Reconcile federal and state filings before submission. A side-by-side comparison catches discrepancies while there’s still time to fix them.
- Use Schedule O generously. Explaining anomalies proactively is almost always better than leaving the IRS to interpret them independently.
- Conduct a pre-filing internal review. A second, informed set of eyes often catches issues that the person closest to the numbers might miss.
- Treat form 990 preparation as a year-round function, not a once-a-year scramble built around the filing deadline.
Where Specialized Nonprofit Accounting Support Makes the Difference
Because so many of these red flags stem from technical nuances specific to nonprofit accounting, functional expense allocation, related-party disclosure requirements, comparability standards for compensation, general bookkeeping knowledge often isn’t quite enough to fully protect an organization.
This is where Non-Profit Books brings real value. Rather than approaching Form 990 as an isolated annual task, the firm builds form 990 compliance into an organization’s everyday financial practices, keeping records structured, reconciled, and audit-ready throughout the year. That kind of consistency doesn’t just make nonprofit Form 990 filing faster; it substantially reduces the odds of ever seeing a follow-up letter from the IRS in the first place.
Final Thoughts
Most IRS scrutiny of nonprofit returns doesn’t stem from fraud or intentional misconduct. It stems from small inconsistencies, undocumented decisions, and numbers that don’t quite line up across different filings. Understanding these red flags gives your organization a genuine advantage: the ability to catch and correct issues before they ever reach an IRS reviewer’s desk.
Strong form 990 reporting isn’t about perfection. It’s about consistency, documentation, and treating the return as a reflection of how the organization actually operates. Whether you manage form 990 preparation internally or work with a nonprofit-focused partner, staying ahead of these seven red flags is one of the most effective ways to protect your organization’s mission, reputation, and tax-exempt status for the long term.
