NCCS Data Source Reference

National Center for Charitable Statistics (NCCS) Form 990 data for private nonprofit colleges and universities (Portal mirror: IPEDS-matched institutions, 1993-2016). Use when IRS-based financial data — revenue, expenses, assets, endowment details — or governance information (board composition, executive compensation) is needed beyond what IPEDS provides. Portal data ends at 2016; for newer direct-source data, use the official NCCS Core catalog, whose merged Core currently covers 1987-2024 and whose SOI-current panel covers 2012-2024. Tax year 2024 is provisional, and recent years remain in progress as late and amended returns arrive. Public institutions do not file Form 990 and are excluded.

The NCCS (National Center for Charitable Statistics) is the principal U.S. repository for empirical data on the nonprofit sector, derived from IRS Form 990 filings. It provides financial depth, governance detail, and historical coverage for private nonprofit colleges and universities that goes well beyond what IPEDS collects.

CRITICAL: Value Encoding

The Education Data Portal encodes ALL categorical variables as integers, not strings. Variable names are lowercase in Portal data. Always verify codes against codebooks.

Context	fips	mult_ein_flag
Portal integer	6 (California)	1 (Yes)
Original NCCS	"06" or string	N/A

See ./references/variable-definitions.md for complete encoding tables.

What is NCCS?

• Operator: Urban Institute, Center on Nonprofits and Philanthropy
• Coverage: All U.S. tax-exempt nonprofit organizations (~3.8M in BMF)
• Primary data source: IRS Form 990 tax filings
• Frequency: Annual (with filing lag)
• Available years: Portal 1993-2016; direct merged Core 1987-2024; direct SOI-current 2012-2024 (2024 provisional and recent years in progress, catalog verified 2026-07-21)
• Primary identifier: EIN (Employer Identification Number, 9-digit)
• Education relevance: Private nonprofit colleges/universities are 501(c)(3) orgs filing Form 990; NTEE codes B40-B50 cover higher education

Reference File Structure

File	Purpose	When to Read
nonprofit-data.md	NCCS datasets and what they contain	Understanding available data sources
form-990.md	IRS Form 990 structure and data elements	Understanding what information is collected
education-relevance.md	How NCCS relates to higher education	Connecting nonprofit data to education research
ntee-codes.md	Nonprofit classification system	Finding and filtering educational institutions
variable-definitions.md	Key financial and organizational variables, codes, special values	Interpreting specific data elements or building queries

Decision Trees

What data am I looking for?

Research need?
├─ Financial data for private colleges → ./references/form-990.md
│   ├─ Revenue breakdown → Part VIII (Statement of Revenue)
│   ├─ Expenses by function → Part IX (Statement of Functional Expenses)
│   ├─ Assets and liabilities → Part X (Balance Sheet)
│   └─ Endowment details → Schedule D
├─ Governance/leadership → ./references/form-990.md
│   ├─ Board members → Part VII (Compensation)
│   ├─ Executive compensation → Part VII, Schedule J
│   └─ Policies and procedures → Part VI (Governance)
├─ Organizational characteristics → ./references/nonprofit-data.md
│   ├─ Basic info (name, address, EIN) → BMF
│   ├─ Tax-exempt type → BMF (SUBSECCD)
│   └─ NTEE classification → BMF (NTEECC)
└─ Identify institutions → ./references/ntee-codes.md
    ├─ All higher education → NTEE B40-B50
    ├─ Universities → B40, B41, B42, B43
    └─ Community colleges → B44

Which NCCS dataset should I use?

Dataset selection?
├─ Need universe of all nonprofits?
│   └─ Business Master File (BMF) → ./references/nonprofit-data.md
├─ Need detailed financial variables?
│   ├─ Large organizations (full 990 filers) → Core PC files
│   ├─ All organizations (990 + 990EZ) → Core PZ files
│   └─ Maximum detail (2000+ fields) → Efile database
├─ Need private foundations?
│   └─ Core PF or 990-PF Efile data
└─ Need small grassroots orgs?
    └─ 990-N ePostcard database

How do I connect NCCS to other education data?

Linking NCCS to education data?
├─ Need to match to IPEDS?
│   └─ See ./references/education-relevance.md (EIN-UNITID crosswalk)
├─ Need geographic analysis?
│   └─ Use BMF geocoded addresses + Census crosswalks
├─ Want institutional comparisons?
│   └─ Filter by NTEE codes B40-B50 for higher ed
└─ Analyzing trends over time?
    └─ Use the official Core catalog; choose merged Core (1987-2024) or SOI-current (2012-2024) and record provisional/in-progress status

Quick Reference: NCCS Datasets and Variables

Available Datasets

Portal mirror (via fetch_from_mirrors()):

Dataset	Description	Coverage	Rows
990 Forms (nccs/colleges_nccs_all)	Form 990 data for higher ed institutions matched to IPEDS	1993-2016, ~2,600 institutions	~30K

Direct NCCS sources (outside Portal):

Dataset	Description	Current Catalog Coverage	Key Use
Merged Core	Harmonized Form 990/990-EZ financial records	1987-2024	Broad historical financial analysis
SOI-current Core	Current-panel Core files	2012-2024	More recent annual analysis
Business Master File (BMF)	Tax-exempt organization registry	Verify in current BMF catalog	Sampling frame, basic information
IRS 990 Efile	Full electronic filings with detailed fields	Verify in current Efile catalog	Detailed governance and programs

Direct-source status (verified 2026-07-21): Tax year 2024 is provisional, and recent tax years remain in progress as late and amended returns arrive. Start at the official Core catalog, https://urbaninstitute.github.io/nccs/catalogs/catalog-core.html, and record the selected product, tax years, retrieval date, and provisional/in-progress status.

Scope note: The Portal mirror contains only Form 990 data matched to IPEDS institutions (~2,600 institutions), fixed at 1993-2016. It does NOT include the broader nonprofit universe or NTEE fields. For non-education nonprofits, NTEE-based filtering, or newer tax years, select the appropriate direct product from the official NCCS catalogs rather than treating "NCCS" as one undifferentiated dataset.

Key Identifiers

Portal dataset:

ID	Format	Level	Example	Notes
unitid	Integer	Institution	110635	IPEDS institution ID (Portal addition)
ein	Integer	Organization	10211484	Employer Identification Number
fips	Integer	State	6 (California)	State FIPS code

Full NCCS (direct download, outside Portal):

ID	Format	Level	Example	Notes
EIN	9-digit number	Organization	123456789	Unique to each nonprofit
NTEECC	Letter + 2 digits	Classification	B42 (4-year college)	May be imprecise (~25%); NOT in Portal data
SUBSECCD	2-digit code	Tax subsection	03 (501(c)(3) charity)	NOT in Portal data
FIPS	5-digit code	Geography	06037 (LA County)	State + county; Portal uses state-level integer

Education NTEE Codes

Code	Description
B20-B29	Elementary & Secondary Schools
B40	Higher Education Institutions (General)
B41	Two-Year Colleges
B42	Undergraduate Colleges (4-year)
B43	Universities
B50	Graduate/Professional Schools
B60	Adult/Continuing Education
B70	Libraries
B80	Student Services/Organizations
B90	Educational Services/Schools N.E.C.

Portal Variable Name Mapping (Selected)

The Portal dataset has 161 columns. Key mappings from original NCCS/990 names to Portal lowercase names:

Portal Name	Original NCCS/990	Description
year	FISYR	Academic year (fall semester) — Portal-aligned year (1993-2016)
fiscal_year	—	IRS fiscal year ending year from 990 filing (1994-2017); typically year + 1
unitid	—	IPEDS institution ID (Portal addition)
ein	EIN	Employer Identification Number
fips	FIPS	State FIPS code (integer)
inst_name_nccs	NAME	Organization name from 990 filing
mult_ein_flag	—	Multiple-EIN indicator (0=No, 1=Yes)
contributions_total	CONT	Total contributions
prog_serv_rev	PROGREV	Program service revenue
revenue_total	TOTREV	Total revenue
expenses_total	EXPS	Total expenses
total_assets_eoy	TOTASS	Total assets (end of year)
net_assets_eoy	NETASS	Net assets (end of year)
compensation_officers	COMPENS	Officer compensation
salaries_other	OTHSAL	Other salaries

Note: The full 161 columns include detailed revenue breakdowns (Part VIII), expense breakdowns (Part IX), and balance sheet items (Part X). Consult the codebook for the complete list. Use get_codebook_url("nccs/codebook_colleges_nccs_form_990") from fetch-patterns.md to download it.

Missing Data Codes

Code	Meaning	When Used
-1	Data unavailable	Not collected for this form/year
-2	Not applicable	Field doesn't apply to this entity
-3	Suppressed	Confidentiality restriction
null	Not reported	Organization did not report (may have data)
0	Zero value	Explicitly reported as zero

Important: In Portal data, -1/-2/-3 are integer values. However, empirically these codes are rare in the NCCS Portal dataset — most missing data appears as null rather than negative codes. Only a handful of financial columns (e.g., sale_sec_gross_net, changes_net_assets_other) contain any -1/-2/-3 values. A 0 means the organization reported zero; null means the organization did not report. These are distinct conditions.

Data Access

Datasets for NCCS are available via the mirror system. See datasets-reference.md for canonical paths, mirrors.yaml for mirror configuration, and fetch-patterns.md for fetch code patterns.

Dataset	Type	Years	Path	Codebook
990 Forms	Single	1993-2016	nccs/colleges_nccs_all	nccs/codebook_colleges_nccs_form_990

Codebooks are .xls files co-located with data in all mirrors. Use get_codebook_url() from fetch-patterns.md to construct download URLs.

Truth Hierarchy: When interpreting variable values, apply this priority:

1. Actual data file (what you observe in the parquet/CSV) — this IS the truth
2. Live codebook (.xls in mirror) — authoritative documentation, may lag
3. This skill documentation — convenient summary, may drift from codebook

If this documentation contradicts the codebook, trust the codebook. If the codebook contradicts observed data, trust the data and investigate.

Filtering

The Portal dataset is pre-filtered to higher education institutions matched to IPEDS UNITIDs. NTEE codes are NOT included in the Portal data — for NTEE-based filtering, use the full NCCS BMF directly.

import polars as pl

# Filter by year
df_2015 = df.filter(pl.col("year") == 2015)

# Filter by state (integer FIPS codes)
df_ca = df.filter(pl.col("fips") == 6)  # California

# Filter out null values from financial columns
df_valid = df.filter(
    (pl.col("revenue_total").is_not_null()) &
    (pl.col("revenue_total") >= 0)  # Excludes rare -1/-2/-3 codes
)

# Replace negative codes with null for analysis (precautionary)
df = df.with_columns(
    pl.when(pl.col("revenue_total") < 0)
    .then(None)
    .otherwise(pl.col("revenue_total"))
    .alias("revenue_total_clean")
)

library(dplyr)

# Filter by year
df_2015 <- df |> filter(year == 2015)

# Filter by state (integer FIPS codes)
df_ca <- df |> filter(fips == 6)  # California

# Filter out null values from financial columns
df_valid <- df |> filter(!is.na(revenue_total), revenue_total >= 0)

# Replace negative codes with NA for analysis (precautionary)
df <- df |> mutate(
  revenue_total_clean = if_else(revenue_total < 0, NA_real_, revenue_total)
)

Common Pitfalls

Pitfall	Issue	Solution
Using string codes	Portal uses integer FIPS (6), not string ("CA" or "06")	Always use integer comparisons; filter >= 1 to exclude missing codes
Filing threshold confusion	Organizations under $200K revenue may file 990-EZ with fewer variables	Check form type; use Core PZ files for combined 990/990-EZ coverage
Fiscal year variation	Nonprofits have different fiscal year ends (June 30 common for colleges)	year = Portal academic year (fall semester); fiscal_year = IRS fiscal year end (typically year + 1). Filter on year for IPEDS joins.
No NTEE in Portal data	Portal dataset does not include NTEE codes; pre-filtered to higher ed institutions	Cannot filter by NTEE code; use full NCCS BMF for NTEE-based filtering
NTEE classification accuracy	~25% of NTEE codes estimated to be imprecise	Use NCCS-corrected codes (NTEE_NCCS) over IRS-assigned codes when available
Consolidated filings	Some university systems file consolidated 990s covering multiple campuses	Check mult_ein_flag; one EIN may represent multiple institutions
Form version changes	Form 990 was redesigned in 2008; variable definitions changed	Be cautious comparing pre-2008 and post-2008 data for governance variables
Missing vs. zero	0 means explicitly reported zero; null means not reported	Distinguish between zero-value and not-reported before aggregating

Key Differences: NCCS vs. IPEDS

Aspect	NCCS (Form 990)	IPEDS
Coverage	All 501(c)(3) nonprofits	Title IV institutions only
Reporting Basis	IRS fiscal year	IPEDS survey cycles
Financial Framework	Nonprofit accounting (GAAP)	Education-specific categories
Governance	Detailed board/compensation data	Limited HR data
Programs	Mission statements, activities	Degree programs, enrollment
Identifier	EIN	UNITID
Update Frequency	Annual (with lag)	Annual

Exploration Workflow

Using Portal Data (Recommended for Education Research)

1. Fetch data via fetch_from_mirrors("nccs/colleges_nccs_all")

   • Data is pre-filtered to higher education institutions matched to IPEDS
   • Already includes unitid for IPEDS joining
   • 161 financial/organizational variables, 1993-2016

2. Filter and clean

   • Filter by year, state (FIPS), or institution
   • Handle nulls (primary missing data form in Portal)
   • Check for rare negative codes (-1/-2/-3) in financial columns

3. Link to IPEDS using unitid and year columns

   • Join with IPEDS directory, enrollment, finance, etc.

4. Analyze — See variable definitions for meaning and limitations

Using Direct NCCS Sources (for Newer Years or Broader Nonprofit Research)

1. Open the official catalog

   • Core catalog: https://urbaninstitute.github.io/nccs/catalogs/catalog-core.html
   • Use this stable catalog as the sole documented Core navigation route

2. Choose the product deliberately

   • Merged Core for harmonized 1987-2024 coverage
   • SOI-current for the 2012-2024 current panel
   • Use the BMF or Efile catalog only when registry fields or filing-level detail is required

3. Record release status before downloading

   • Tax year 2024 is provisional as verified on 2026-07-21
   • Recent years remain in progress while late and amended returns arrive
   • Capture product name, tax years, retrieval date, and any catalog status note

4. Identify and validate organizations

   • Filter BMF/NTEE fields (for example B40-B50 for higher education) only in direct products that actually include them
   • Verify 501(c)(3) status where relevant and retain EINs
   • Do not assume a direct NCCS record has a Portal unitid; build or validate an EIN-UNITID crosswalk separately

5. Extract, clean, and analyze

   • Follow the exact file links and documentation in the current catalog
   • Merge BMF attributes only when needed and handle product-specific missing values
   • See variable definitions for interpretation and limitations

Related Data Sources

Source	Relationship	When to Use
education-data-source-ipeds	Complementary institution data	Join on EIN-UNITID crosswalk for enrollment, degrees, and education-specific financials
education-data-explorer	Parent discovery skill	Routing questions to mirror dataset files
education-data-query	Data fetching	Downloading parquet/CSV files

Topic Index

Topic	Reference File
BMF overview	./references/nonprofit-data.md
Core data series	./references/nonprofit-data.md
Efile database	./references/nonprofit-data.md
Form 990 structure	./references/form-990.md
Revenue variables	./references/form-990.md
Expense variables	./references/form-990.md
Balance sheet	./references/form-990.md
Governance data	./references/form-990.md
Schedule details	./references/form-990.md
Linking to IPEDS	./references/education-relevance.md
Private college identification	./references/education-relevance.md
Supplementing education research	./references/education-relevance.md
NTEE code structure	./references/ntee-codes.md
Education NTEE codes	./references/ntee-codes.md
NTEEV2 format	./references/ntee-codes.md
Financial variables	./references/variable-definitions.md
Variable naming conventions	./references/variable-definitions.md
Data quality issues	./references/variable-definitions.md