Education (B11) IRS Verified DX Registered 990 on File

MERCER ISLAND SCHOOLS BAND BOOSTERS

EIN: 27-4163270 · MERCER ISLAND, WA 98040-1471 · United States · FY 2025 Data

3 out of 5 55 / 100 Based on 2+ years of filings

Financial strength (30%) 86/100

Reliability (20%) 50/100

Effectiveness (25%) 78/100

Impact (25%) No data yet

Financial data: FY 2025 · Scored 9/13/2026

Claim this Charity

CharityAI™ Score

Not yet evaluated

Mission Statement

Mercer Island Schools Band Boosters (MISBB) works to ensure the Mercer Island School District Band program is as supported as possible through Scholarships, professional one-on-one tutoring, Personalized instrument instructions, Professional development, Instrument clubs, administrative support, Artist-in-Residences, Purchase of instruments and Uniform maintenance.

Financial Overview — FY 2025

$144K

Total Revenue

$81K

Total Expenses

$305K

Net Assets

Employees

Revenue Sources

Expense Breakdown

Program Expense Ratio 93.0%

Fundraising Efficiency 0.0%

Operating Reserve 45.32x

Liability-to-Asset 1.8%

Revenue Diversification 96.1%

Compared with Peers

FY 2025

Compared with 13,695 similar organizations (United States, Education, under $100K in expenses), FY 2025.

This organization Middle half of peers (P25–P75) Peer median

Ratio	This org	Peer median	Position (P10 → P90)
Program expense ratio Program expenses / total expenses · higher is better	93.0%	87.0%	P10P90	Above median
Admin expense ratio Management and general / total expenses · lower is better	7.0%	6.6%	P10P90	Below median
Fundraising expense ratio Fundraising expenses / total expenses · lower is better	0.0%	0.0%	P10P90	Top quarter
Fundraising efficiency Fundraising expenses / gross fundraising income · lower is better	0.0%	38.7%	P10P90	Top quarter
Operating reserve Months of expenses covered by net assets · higher is better	45.3 mo	18.3 mo	P10P90	Above median
Liabilities to assets Total liabilities / total assets · lower is better	1.8%	0.0%	P10P90	Bottom quarter
Revenue concentration Share of revenue from the largest source · lower is better	96.1%	81.6%	P10P90	Below median
Surplus margin Surplus as a share of revenue	43.9%	10.7%	P10P90

Financial History

Year	Revenue	Expenses	Net Assets	Program %	Staff
2025	$144K	$81K	$305K	93.0%	0
2023	$209K	$184K	$294K	89.9%	0
2022	$151K	$86K	N/A	—	0
2021	$58K	$68K	N/A	—	1

Donor Reviews

Write a Review

No reviews yet

Be the first to share your experience with this organization.

Write a Review

Your Name *

Email * (private, not shown)

Relationship to Organization *

Your Rating *

Review Title

Your Review *

Minimum 20 characters

Post anonymously

Reviews appear after moderation (usually within 24 hours)

Organization Details

EIN: 27-4163270
State: WA
City: MERCER ISLAND
ZIP: 98040-1471
Classification: B11
Category: Education
Rating: 3★
Coverage: A
Last Updated: Aug 2026
IRS Ruling Year
Foundation Code
Form 990: On File

Is this your organization?

Claim it to manage this profile, add your board, financials and impact metrics, and lift your CharityAI™ rating.

Claim this Charity

Write a Review

Back to Search New Search

CharityAI™ rates charities from 0 to 100 using public filings (IRS Form 990 and the equivalent registries outside the US) together with the information the charity itself provides on DonationX. Ratings are recalculated every quarter, without human bias, and shown as stars.

Four pillars

Financial strength30%

Program expense ratio, fundraising efficiency, operating reserves, liabilities and revenue diversification, compared with similar organizations.

Reliability20%

Standing with the registry, filing history, verification and how complete the profile is.

Effectiveness25%

How much goes to programs and how consistently the organization delivers them.

Impact25%

The outcomes the charity reports on DonationX: people served, cost per service and results.

Stars

★★★★★ 80–100 ★★★★☆ 60–79 ★★★☆☆ 40–59 ★★☆☆☆ 20–39 ★☆☆☆☆ 1–19

A pillar with no data counts as zero. Without impact metrics the score is capped at 59 (three stars): only the charity can supply that data.
The coverage grade (A to D) says how much filing data the score rests on; NONE means there is not enough to rate.
An organization that is not in good standing with its registry (for example a revoked tax exemption) is shown as Not rated.
"Compared with peers" places the charity's key ratios against organizations of the same country, sector and size.

How a charity improves its rating

Claim the charity with a work email, a website token, or a document.
Complete the profile: mission, website, logo and contacts.
Add board members, your latest Form 990 or financials, and impact metrics.
Keep it current: the next quarterly rating picks the changes up.