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Small Business

October 6, 2026

Why I Got an EIN as a Sole Proprietor | Justin Sha

Justin Sha explains why he obtained an EIN as a sole proprietor before submitting a W9, what an EIN changes, and what it does not. Continue reading

Business & Employment Law, Startup Law

EIN, Employer Identification Number, Field Note, Form W-9, IRS, Justin Sha, Professional Services, Small Business, Sole Proprietor, SSN, Tax Filings

About Me

I’m Justin Sha, a California lawyer, founder, and adjunct professor based in San Francisco.

Sha.Law is where I write about law, business, and technology: which rules matter, how businesses operate, and the tradeoffs behind real decisions.

Lawyers tend to write like only other lawyers are reading. I try to write for the people making decisions.

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Small Business

Why I Got an EIN as a Sole Proprietor | Justin Sha