IRS Business Activity Code for Waterproofing
The IRS principal business activity code for a(n) Waterproofing business is 238300 (derived from NAICS code 238390).
PBA Asset Details
| IRS PBA Code | 238300 |
|---|---|
| Associated NAICS Code | NAICS 238390 (Other Building Finishing Contractors) |
| Tax Forms | Schedule C Line B, Form 1065, Form 1120, Form 1120-S |
| Mapping Integrity | This industry is rolled up to a parent category in the IRS PBA list since the IRS utilizes a simplified subset of the 6-digit NAICS taxonomy. |
PBA vs NAICS Common Mismatches
While IRS PBA codes are based on NAICS categories, the IRS simplifies the database by rolling up several specific 6-digit NAICS codes into a broader category. Always check the official IRS Schedule C instructions to confirm that the simplified code is accepted for your tax year.
YMYL Compliance Disclaimer: Principal Business Activity lists are updated annually by the Internal Revenue Service. Always cross-verify with the official instructions for Form 1040 (Schedule C) or Form 1120 before final filing.
Related Pages & Tools
- NAICS Code 238390 Profile — Official definition, SBA size standards, and statistics.
- Industry Directory for Waterproofing — Alternative codes and structure.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Primary Ingestion Source
Data derived from the IRS Instructions for Schedule C (Form 1040) Principal Business Activity Codes. Last verified on 2026-06-30.