(Bloomberg) -- Square and Twitter CEO Jack Dorsey, in a series of tweets Friday, returned to the topic of “Proposition C,” a proposed San Francisco corporate tax increase that could double the city’s budget to fight its widespread homeless problem, a topic which has spurred debate and already caused Dorsey to butt heads with Salesforce.com’s CEO Mark Benioff.

I admit that while I come at this as a citizen first, there’s an unfairness I see in my role of CEO of Square (this does not apply to Twitter). Companies like Square and Stripe would be taxed at a significantly larger total contribution than much larger companies like Salesforce.

Dorsey made today’s comments after Benioff publicly questioned Dorsey’s commitment to fighting homelessness in a series of tweets last week. Salesforce and Square are both headquartered in San Francisco.

We’re happy to pay our taxes. We just want to be treated fairly with respect to our peer companies, many of whom are 2-10x larger than us. Otherwise we don’t know how to practically grow in the city. That’s heartbreaking for us as we love SF and want to continue to help build it.

While the same “unfairness” issue doesn’t apply to Twitter, Dorsey said, Square could hypothetically face more than $20 million in taxes in 2019 compared to Salesforce:

Hypothetically Square could pay over $20m more in 2019, while Salesforce (4x bigger than Sq) pays less than $10m. Taxes would grow at rates multiple times our adj. revenue, which no company can sustain. Not an issue for Salesforce/Twitter, but unfair to Sq and fintech startups.

Benioff has committed $1 million to campaign for the ballot initiative, which proposes an additional tax of at least 0.175 percent on businesses’ gross receipts above $50 million. Without referencing the Square CEO directly, he also tweeted after Dorsey’s thread:

7500 homeless people & 1200 homeless families & kids are on SF streets daily. We can all solve this now with critical new funding for shelters, addiction centers, & mental health. Prop C is the answer. Big corporations like mine pay, you don’t pay. https://t.co/b5XETmvCvK

Dorsey also said he wants to address homelessness "long-term in a scalable way, with accountability" and that he hopes this adds some color to the discussion. Still, he ended his Twitter thread with a caveat:

P.S. I appreciate I could be wrong about this. If I am, I’ll admit it, and work to fix. I’m committed to addressing this crisis in our city, and mindful of the urgency required. Here’s the mayor’s thoughts on the matter: https://t.co/Ef0Xz54FHR

To contact the reporter on this story: Molly Kissler in New York at mkissler@bloomberg.net

To contact the editors responsible for this story: Lauren Berry at lberry4@bloomberg.net, Clementine Fletcher

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