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International Institute of Acoustics and

Auburn University, Alabama · EIN 63-1163930 · Medical Research · tax-exempt since 1998

C

Charity Clarity grade C (score 55.4 of 100), based on the Form 990 for the year ended May 2026.

Graded against 3,390 medical research nonprofits with revenue $500K–$2M filing the same form. A = top 10%, B = next 20%, C = middle 40%, D = next 20%, F = bottom 10%.

What goes into the grade

MeasureThis charityScore (0–100)
ReservesMonths of spending covered by unrestricted net assets.13.8 months86
GovernanceBoard independence, key policies and audit, per the 990.39% of practices39
Margin stabilityHow steady the surplus or deficit is year to year.15
Revenue spreadHow much revenue rests on one type of income.77% from one source53
Filing recordOn-time, complete filings, year after year.100%100

Scores compare this charity with its peer group; 100 is best. How Charity Clarity rates charities.

Year by year

201720192023202420252026grey: revenue · green: spending
Year endedFormRevenueSpendingSurplusNet assetsMonths of spendingStaffGrade
May 2026Form 990$687K$619K$68K$710K13.80C
May 2025Form 990$178K$65K$114K$660K122.60D
May 2024Form 990$309K$270K$39K$544K24.20C
May 2023Form 990$248K$40K$207K$530K157.30F
May 2019Form 990$150K$211K−$61K$547K31.10C
May 2017Form 990$61K$87K−$25K$509K70.40F

From the organisation’s own IRS filings. “Months of spending” is total net assets divided by a month of that year’s spending. A blank grade means that year was not rated.

Read the filings

Every figure here comes from the returns this charity filed with the IRS. These sites show the full returns and more about the organisation:

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