San Francisco Payroll Tax Guide: The Payroll Expense Tax and Homelessness Gross Receipts Tax

Overview of San Francisco Business Taxes

San Francisco imposes a unique set of business taxes that are separate from and in addition to California state taxes. For startups, the most relevant are the Payroll Expense Tax, the Gross Receipts Tax, the Homelessness Gross Receipts Tax, and the Overpaid Executive Tax. All of these are administered by the San Francisco Office of the Treasurer and Tax Collector.

Every business that operates in San Francisco, including out-of-city businesses with SF employees, must register for a San Francisco Business Registration Certificate. The annual registration fee is $45 for businesses with gross receipts of $100,000 or less, $75 for gross receipts between $100,001 and $250,000, and varies up to several hundred dollars for larger companies.

San Francisco uses an annual filing cycle. Most business taxes are reported on a combined tax return filed annually, with an original due date on the last day of February following the tax year (February 28 or 29 for calendar-year filers). An automatic extension to April 15 is available.

Small businesses with combined San Francisco payroll expense of $400,000 or less and total San Francisco gross receipts of $2,525,000 or less qualify for the Small Business Exemption, which exempts them from the Payroll Expense Tax and Gross Receipts Tax. This exemption is valuable for early-stage startups, but growing quickly means you may only benefit from it for one or two years.

The Payroll Expense Tax

The San Francisco Payroll Expense Tax is imposed at a rate of 0.38% on payroll expense attributable to San Francisco. Payroll expense includes total compensation paid to employees (wages, salaries, bonuses, stock option exercises), but the definition has evolved over time as San Francisco transitioned from a pure payroll tax to a gross receipts tax system.

Payroll expense attributable to San Francisco is determined based on where the employee performs services. For employees who work exclusively in San Francisco, 100% of their compensation is included. For employees who split time between San Francisco and other locations, only the portion of compensation attributable to San Francisco work is included.

The transition from payroll tax to gross receipts tax began in 2014 under Proposition E. The payroll tax rate has been gradually reduced as the gross receipts tax has been phased in. By 2026, the payroll expense tax rate is 0.38%, and the gross receipts tax is the primary business tax for most companies.

For startups with significant stock-based compensation, the payroll expense tax can create large liabilities in years when employees exercise stock options or when restricted stock vests. The value of stock option exercises is included in payroll expense for payroll tax purposes. A company with multiple employees exercising options in a single year (such as in anticipation of an IPO) can face a significant payroll tax bill. Planning the timing of exercises and providing employees with guidance on exercise strategies can help manage this exposure.

The Gross Receipts Tax and Homelessness Gross Receipts Tax

The San Francisco Gross Receipts Tax is imposed on gross receipts attributable to San Francisco. Tax rates vary by industry category, with 14 categories covering different business types. Technology companies generally fall under the "Information" category, which has rates starting at 0.162% for receipts between $1 million and $2.5 million and increasing to 0.756% for receipts over $25 million (rates as of 2026).

Gross receipts attributable to San Francisco are determined using rules specific to the type of receipts. Service revenue is attributed based on where the customer receives the benefit. Product revenue is attributed based on delivery destination. Rental revenue is attributed based on property location. For SaaS companies, subscription revenue is typically attributed to San Francisco based on the percentage of customers located in the city.

The Homelessness Gross Receipts Tax (Proposition C, passed in 2018) is an additional tax imposed on businesses with worldwide gross receipts exceeding $50 million. The rates vary by industry, ranging from 0.175% to 0.69% of excess gross receipts. This tax primarily affects larger companies, but fast-growing startups that reach the $50 million revenue threshold become subject to it.

The Overpaid Executive Tax (Proposition L, passed in 2020) is imposed on businesses where the ratio of the highest-paid managerial employee's compensation to the median worker's compensation exceeds 100:1. The tax ranges from 0.1% to 0.6% of the business's San Francisco payroll expense, depending on the ratio. While this primarily targets large enterprises, startups should be aware of it as they scale.

Tax Credits and Exemptions for SF Startups

San Francisco offers several tax benefits that can offset the business tax burden. The Small Business Exemption, mentioned earlier, exempts businesses with $400,000 or less in SF payroll and $2,525,000 or less in SF gross receipts from the Payroll Expense Tax and Gross Receipts Tax. This is the most valuable exemption for early-stage startups.

The Biotech Payroll Tax Exclusion allows qualifying biotechnology companies to exclude certain compensation from the payroll expense tax calculation. While not applicable to most software startups, this exemption is relevant for companies at the intersection of technology and life sciences.

The Central Market Street and Tenderloin Area Tax Exclusion (commonly known as the "Twitter tax break" or Mid-Market payroll tax exclusion) was a program that provided payroll tax relief for businesses locating in the Central Market/Tenderloin area. This program has been modified and largely phased out, but companies that qualified during the original period may still benefit from grandfathered provisions.

Stock option exercise planning is one of the most impactful strategies for managing San Francisco payroll tax. Since stock option exercises generate includable payroll expense, timing exercises strategically, potentially splitting them across calendar years, can smooth the payroll tax impact. This is particularly relevant in the pre-IPO window when many employees exercise simultaneously.

At SpryTax, we model the San Francisco tax impact for our clients as part of our annual tax planning process. The interaction between payroll expense tax, gross receipts tax, and California state taxes creates opportunities for optimization that require understanding all layers simultaneously.

Compliance Calendar and Filing Tips

San Francisco business taxes require careful calendar management. Key dates for calendar-year filers include the following. The Business Registration Certificate renewal is due annually, with the fee based on prior-year gross receipts. The combined San Francisco tax return (covering Payroll Expense Tax, Gross Receipts Tax, Homelessness GRT, and Overpaid Executive Tax) is due February 28, with an automatic extension to April 15.

Quarterly estimated payments are required if you expect your annual tax liability to exceed $5,000. Estimated payment due dates are April 30, July 31, October 31, and January 31. Underpayment penalties apply if estimated payments do not cover at least 80% of the annual liability.

Common filing mistakes include failing to include stock option exercises in payroll expense, incorrectly attributing gross receipts to San Francisco (particularly for SaaS companies with national or global customer bases), overlooking the small business exemption (some startups pay taxes they do not owe because they did not claim the exemption), and failing to register when the only San Francisco connection is one or two remote employees working from the city.

San Francisco is increasingly aggressive about identifying unregistered businesses. The Treasurer's office cross-references state employment records, business license databases, and commercial lease records to identify businesses operating in San Francisco without registration. The penalty for operating without registration is $250 per quarter.

At SpryTax, we handle all San Francisco business tax filings for our Bay Area clients, including registration, estimated payments, annual returns, and audit support. Our familiarity with the specific rules for technology companies ensures accurate filing and maximum use of available exemptions.