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PeerBasis
Compensation Comparability Determination

Old Mill Foundation

Executive Director / CEO

EIN 954549517
CA · NTEE A540
FY ending 2024-12-31
June 9, 2026

This analysis benchmarks the total compensation of Kate Sinclair, Executive Director / CEO ($60,000) against every comparable organization that fit the selection criteria — 109 in total — drawn systematically from IRS Form 990 filings, not a hand-picked subset.

Compensation sits at approximately the 52nd percentile of comparable organizationswithin the typical range

Benchmarked executive: Kate Sinclair — reported title “EXECUTIVE DIR.”, a direct title match to the Executive Director / CEO role.

How comparable organizations were selected

109 organizations qualified on sector, size, and geography 109 within the band form the benchmarked peer set.

Distribution of comparable compensation

$114 total compensation of comparable organizations → $206,862 $60,000
$21,14710th
$45,74625th
$59,303Median
$80,45775th
$92,26190th
$60,000This org · 52nd
p10$21,147
p25$45,746
p50$59,303
p75$80,457
p90$92,261
$60,000

Comparable organizations

Each figure is Form 990 Part VII columns D + F (reportable pay plus other compensation and benefits; column F may include amounts from related organizations), normalized to CA cost of living (BEA RPP, 2023) and to its filing year (CPI-U); the reported amount is on each linked 990.

OrganizationStateRevenueMatched titleComp
(reported)
Comp
(adjusted)
FY
Franklin Opera House Inc NH$301,823 Executive Director $29,120 $30,336 2025
Smithfield Preston Foundation VA$302,252 Executive Dir. $81,912 $91,592 2024
The Waterfront Museum NY$300,796 President $89,524 $93,684 2024
Bisbee Council On The Arts And Humanities AZ$299,682 Museum Director $70,167 $80,457 2023
The Phelps Mansion Museum NY$298,199 Executive Director $53,480 $54,522 2025
Nassau County Firefighters Museum And NY$297,237 Executive Director $80,000 $83,717 2024
The American Bookbinders Museum CA$297,007 Executive Di $116,906 $120,359 2023
Roebling Main Gate Museum NJ$306,378 Executive Director $75,855 $80,749 2023
The Citizen Soldiers Education VA$293,178 Executive Director $36,000 $41,443 2023
The Sandra Bornstein Holocaust Education RI$292,809 Executive Director $76,524 $87,486 2023
The Rice Museum SC$310,577 Executive Director $17,248 $20,301 2025
Fairfield County Heritage OH$311,054 Executive Di $54,990 $67,450 2024
Ninepipes Museum Of Early Montana MT$311,614 Exective Director $29,974 $38,522 2023
Heritage Square Foundation AZ$290,839 Executive Director $65,730 $75,368 2023
Cloud County Historical Society KS$290,510 Curator $24,480 $31,532 2023
Governor Frank G Clement Railroad TN$289,001 Executive Di $48,808 $61,169 2023
California Heritage Museum CA$314,102 Executive Director $42,959 $44,228 2023
The Lawson Boating Heritage Center On Chautauqua Lake NY$314,302 Trustee $4,150 $4,343 2024
Grand Traverse Lighthouse Museum MI$314,482 Executive Director $75,772 $90,572 2024
The Gunflint Trail Historical MN$315,116 Executive Di $30,616 $35,034 2024
Jewish War Veterans Of The Usa National DC$286,022 National Executive Director $3,021 $3,161 2023
Heritage Museum Foundation At Grissom Air Reserve Base IN$318,389 Executive Director $68,500 $83,656 2024
Old Red Courthouse Inc TX$283,360 Executive Dir. $75,000 $86,883 2024
Diplomacy Center Foundation DC$323,376 President $157,500 $160,059 2024
Delmarva Discovery Center & Museum Inc MD$323,477 Coo $55,000 $59,548 2024

Comp (reported) is the figure on each organization's Form 990 (columns D + F); Comp (adjusted) normalizes it to CA cost of living and 2024 dollars. Click any organization to verify the figure on ProPublica.

Methodology

Comparable organizations were drawn from electronically filed IRS Form 990 returns and matched on sector (NTEE code), budget (a size-adaptive revenue band that tightens as the organization grows), and geography (same-state first, broadening only when too few peers qualify); every organization within the band forms the peer set. To compare fairly across regions and years, peer compensation is normalized to CA cost of living (BEA Regional Price Parities, 2023) and to the subject's filing year (CPI-U). The figure benchmarked is Form 990 Part VII, Section A, columns D + F — reportable pay plus other compensation, benefits, and deferred amounts (column F may include amounts from related organizations) — with the chief executive matched by role. Related-organization amounts (column E) and institutional trustees are excluded. Full methodology: peerbasis.org/methodology.

Sample, role match & sensitivity

Sensitivity — the subject's percentile under alternative compensation definitions:

BasisSubject percentile
Total compensation (D + F), cost-of-living + inflation adjusted — the PeerBasis default52nd
Total compensation (D + F), as reported (no adjustments)62nd
Reportable pay only (column D), adjusted53rd
All sources (D + E + F), adjusted50th

If the percentile moves materially across these definitions, the result is sensitive to methodology choices, and the board should weigh which basis best fits its facts.

Rebuttable presumption of reasonableness · 26 CFR 53.4958-6

Compensation paid by a tax-exempt organization is presumed reasonable — shifting the burden to the IRS — when three requirements are met. This report supplies the comparability data for the second. The board should record the following in its minutes concurrently with its decision:

Draft board minutes — executive compensation

  1. The compensation of the Executive Director / CEO (Kate Sinclair) was approved in advance by [the Board / Compensation Committee], composed of members with no conflict of interest with respect to the arrangement.
  2. Prior to its determination, the authorized body obtained and relied upon appropriate comparability data, namely the PeerBasis Compensation Comparability Determination dated June 9, 2026, comparing compensation against 109 similarly situated organizations (Same NTEE sector (A54), nationwide + budget 0.67–1.5× revenue).
  3. The authorized body determined that total compensation of $60,000 is reasonable (approximately the 52nd percentile of comparable organizations) and documented the basis for this determination concurrently, on [date], by a vote of [__ for / __ against].

Sources: IRS Form 990 e-file data (apps.irs.gov); IRS Business Master File (NTEE classification). Every figure traces to an original public filing — click any organization above to verify it on ProPublica. PeerBasis is a service of Prismind Analytics; its methodology is published, was commissioned for independent adversarial review, and discloses its own limitations. This report is comparability data to support a board's good-faith determination under IRC 4958; it is not legal or tax advice. Generated by PeerBasis on June 9, 2026.