Uncategorized IRS Verified DX Registered 990 on File

MOUNT TAMALPAIS SCHOOL

EIN: 94-2356968 · MILL VALLEY, CA 94941-3584 · United States · FY 2025 Data

3 out of 5 58 / 100 Based on 2+ years of filings

Financial strength (30%) 82/100

Reliability (20%) 55/100

Effectiveness (25%) 88/100

Impact (25%) No data yet

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

Claim this Charity

CharityAI™ Score

Not yet evaluated

Financial Overview — FY 2025

$16.9M

Total Revenue

$13.9M

Total Expenses

$23.3M

Net Assets

Employees

Revenue Sources

Expense Breakdown

Program Expense Ratio 77.9%

Fundraising Efficiency 1057.3%

Operating Reserve 20.05x

Liability-to-Asset 40.2%

Revenue Diversification 73.2%

Executive Compensation $768K

Compared with Peers

Peer comparison is not available for this organization.

Financial History

Year	Revenue	Expenses	Net Assets	Program %	Staff
2025	$16.9M	$13.9M	$23.3M	77.9%	72
2024	$15.0M	$12.9M	$19.7M	74.7%	80
2023	$13.8M	$12.1M	$16.8M	74.8%	81
2022	$11.8M	$11.3M	$14.4M	75.1%	81
2021	$16.6M	$10.5M	N/A	—	75

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: 94-2356968
State: CA
City: MILL VALLEY
ZIP: 94941-3584
Rating: 3★
Coverage: A
Last Updated: Aug 2026
IRS Ruling Year: 1976
Foundation Code: 11
Form 990: On File

Contact

Visit Website

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.