If you run a startup in Riverside and someone has told you that you "need to make a Water's Edge election," stop and take a breath. For the overwhelming majority of early-stage startups in the Inland Empire, the answer is no. You almost certainly do not need one, and filing the paperwork when it does not apply to you just adds confusion to a return that is already complicated enough.
But the California Water's Edge election for startups is real; it matters enormously to a specific group of companies, and the rules around it are about to get more interesting thanks to a bill moving through Sacramento. So let's break it down properly. By the end of this, you'll know exactly which camp your company falls into and what to do about it.
A quick note before we start: this is educational information, not legal or tax advice. Your situation is yours alone, and a qualified professional should review the specifics before you make any election with the Franchise Tax Board.
The Short Version: Who Actually Cares About This?
Here's the rule in one sentence. The Water's Edge election only matters if your startup is part of a unitary group that includes foreign affiliates, meaning your company owns or is owned by businesses operating outside the United States as part of the same integrated operation.
Read that again, because the two conditions both have to be true:
- You have a combined group of related companies operating as one business.
- At least one of those companies operates abroad.
If you're a single Delaware C-corp running a SaaS product out of an office in Riverside, with no foreign subsidiaries and no foreign parent, this election does not apply to you. There is nothing to elect. You file your California return, you pay your franchise tax, and you move on with your life.
If you're nodding along thinking "that's me, single entity, all domestic," you can skip to the FAQ at the bottom and save yourself ten minutes. If your structure is more tangled, keep reading, because this is where it gets important.
What the Water's Edge Election Actually Does
To understand the election, you first have to understand the default rule that changes.
California taxes corporations on the income they earn from sources inside the state. When two or more related corporations operate as a single "unitary" business, California makes them file a combined report that pools their income together, then applies a formula to figure out how much of that pooled income belongs to California.
Here's the part that surprises founders. By default, that combined report includes your foreign affiliates. By default, foreign affiliates operating in the unitary group must be a part of the combined filing. This is called worldwide combined reporting, and it means California wants to look at your global operation, not just your U.S. footprint, when deciding what's taxable here.
The Water's Edge election is the off-ramp. A "water's edge" election can be made, and by doing so, the business income of their foreign affiliates is not included in the combined group's income and is not subject to California tax. In plain terms, you're drawing a line at the U.S. border, the "water's edge," and telling California it only gets to tax what happens on this side of it.
The Franchise Tax Board, California's version of the IRS, describes the mechanism directly in its corporation tax instructions. In general, under a water's-edge election, affiliated foreign corporations are excluded from the combined report. The election does not erase the concept of a unitary business; it just limits which entities get swept into the California calculation.
So for a company with significant foreign operations, this election can be the difference between California taxing a sliver of your activity versus reaching for a piece of your worldwide income. That's not a small distinction. For the right company, it's a major decision.
Why This Rarely Applies to a Riverside Startup
Now let's bring it home to the Inland Empire.
The typical startup we see in Riverside, San Bernardino, and the broader IE looks like this: one U.S. entity, usually a Delaware C-corp, with a team that's either local or remote across a few states. Revenue comes from U.S. customers or a SaaS product. There are no overseas subsidiaries, no foreign parent company, and no integrated operation running out of another country.
For that company, there is no foreign affiliate to exclude, which means there is nothing for the Water's Edge election to do. You can't draw a line at the water's edge if all your operations already sit on one side of it.
This is why the question "Does my Riverside startup need a Water's Edge election?" almost always answers itself once you map out the actual corporate structure. The election is built for multinational groups. Most early-stage startups, wherever they're based in California, are not multinational groups. Riverside doesn't change that math, and neither does San Francisco. This is a statewide rule that turns entirely on your structure, not your zip code.
When It DOES Apply: The Startups That Need to Pay Attention
Here's where founders get caught off guard, because more startups have foreign affiliates than you'd expect. Watch for these scenarios:
You have a foreign parent company. Plenty of founders incorporate abroad first, then set up a U.S. entity to chase the American market. If your Riverside operation is a subsidiary of a company headquartered in India, the UK, Israel, or anywhere else, you may be part of a unitary group with a foreign member. That triggers the analysis.
You spun up an overseas subsidiary. As startups scale, they open a development shop in Eastern Europe, a support center in the Philippines, or a sales office in Singapore. The moment that a foreign entity is integrated into your operation, you have a combined group with a foreign affiliate, and the default worldwide reporting rule is now in play.
You're a U.S. company with international founders building something genuinely cross-border. International founder structures get complicated fast, and the line between "single U.S. startup" and "multinational unitary group" is not always obvious. If your cap table and your operations cross borders, this deserves a real look. Sorting out the [international startup tax requirements](Post 7 — Foreign Founders) that come with foreign ownership is exactly the kind of thing that's easy to get wrong without help.
If any of these describe your company, the Water's Edge election stops being theoretical. You'd be choosing between letting California see your worldwide income or making the election to wall off the foreign piece. That's a real decision with real dollars attached, and it's not one to make on a hunch.
The Catch Nobody Warns You About: It's a Seven-Year Commitment
Here's the part that should make you slow down before electing anything.
The Water's Edge election is not a year-by-year choice you toggle on and off based on whatever's cheaper this filing season. Once made, a water's edge election lasts for seven years. You're locking in.
The California Chamber of Commerce puts it even more bluntly, framing it as a binding agreement with the state. Taxpayers who choose to file on a water's-edge basis enter into a binding seven-year contract to use that method. During the contract period, they can't revert to the worldwide method for a year simply because it would result in a lower tax burden.
Think about what that means for a startup. Your structure at Seed looks nothing like your structure at Series B. You might acquire a foreign team, spin off a subsidiary, or restructure entirely after a funding round. An election that made sense the year you filed it could become a liability three years later, and you're stuck with it. Businesses may pay higher taxes during portions of the seven years because they chose to file on a water's edge basis.
This is precisely why "just file the election to be safe" is bad advice. There's no "to be safe" with a seven-year binding commitment. You make this choice with a clear projection of where your company and its entity structure are heading, or you don't make it at all.
The Plot Twist: California May Kill the Election Entirely
Now for the development that changes the whole conversation, and the reason this topic is worth your attention in 2026, even if you've ignored it before.
There's a bill in the California legislature, AB 1790, that proposes to phase out the Water's Edge election altogether and force every corporation back to worldwide combined reporting. AB 1790 will return the state to the Worldwide Combined Reporting (WWCR) method for taxing multinational corporations doing business in California beginning in 2028.
The mechanics of the proposal are aggressive. For tax years beginning on or after Jan. 1, 2026, and before Jan. 1, 2028, current water's edge filers may terminate the water's edge election without the consent of the Franchise Tax Board. And then the hammer: Every water's-edge election is terminated as of the first taxable year beginning on or after January 1, 2028.
The author of the bill isn't shy about the target, calling the election the largest corporate tax break in the state. "For the last 40 years, California has allowed the biggest corporations to choose a tax scheme that ensures they pay as little in taxes as possible," said Assemblymember Damon Connolly, who described the water's edge election as "the largest corporate tax break in California," one that cost the state $4.1 billion in 2024-2025.
Here's the crucial part, so you don't walk away with the wrong impression: AB 1790 is not law. As of mid-2026, the bill stalled in committee. Status: (Introduced) 2026-05-14 - In committee: Hearing postponed by committee. Because it raises taxes, it faces a steep procedural hurdle, requiring a two-thirds supermajority vote in each chamber to pass. The business community, led by CalChamber, is fighting it hard, partly on the argument that no other state or national government mandates this kind of reporting.
So why does a stalled bill matter to you? Because if you're a startup weighing a seven-year Water's Edge election right now, you are potentially locking into a method the state is actively trying to abolish. That doesn't automatically mean "don't elect." It means the decision now carries a moving political variable on top of the tax math, and that's one more reason to get real guidance before you commit rather than copying what your company did last year on autopilot.
So, What Should You Actually Do?
Let's land this with a clear decision path.
If you're a single U.S. entity with no foreign affiliates: Do nothing about Water's Edge. It doesn't apply to you. Focus your energy on the California tax obligations that do hit you, like the franchise tax and your filing deadlines. There are plenty of real California tax traps for startups worth your attention; this just isn't one of them for your structure.
If you have foreign parents, foreign subsidiaries, or a genuinely cross-border operation: This is a real decision and you need to model it properly. Run the numbers both ways, factor in where your structure is heading over the next several years, and weigh the AB 1790 uncertainty. Do not make a seven-year binding election based on a rule of thumb.
If you're not sure which camp you're in, that uncertainty is itself the answer. The gap between "simple domestic startup" and "multinational unitary group" is exactly where founders make expensive mistakes. Getting your broader California tax compliance for Riverside startups reviewed by someone who handles startup structures every day is the cheapest insurance you'll ever buy.
The Water's Edge election is a powerful tool for the companies it's built for and a complete non-issue for everyone else. Knowing which one you are is the whole game.
When you need this handled by professionals who work with startups specifically, the team we trust for startup tax and accounting is the partner we point Riverside founders to. You can book a free consultation with them here and get a straight answer about your specific structure.
Frequently Asked Questions
What is the California Water's Edge election in simple terms?
It's an election that lets a multinational corporate group exclude its foreign affiliates from California's combined tax report. Without it, California's default rule pulls your worldwide operations into the calculation of what's taxable in the state. The election draws the line at the U.S. border, the "water's edge," so California only taxes domestic activity.
Does a typical Riverside startup need to make a Water's Edge election?
Almost never. The election only matters if your company is part of a unitary group that includes foreign affiliates, like a foreign parent or an overseas subsidiary. A standalone U.S. startup with no foreign entities has nothing to elect, regardless of whether it's based in Riverside, the Bay Area, or anywhere else in California.
How long does a Water's Edge election last?
Seven years. It's a binding commitment, not an annual choice you can switch on and off. Once you elect, you generally can't return to worldwide reporting for the duration, even if it would lower your taxes in a given year, which is why the decision deserves serious modeling before you file it.
Is California getting rid of the Water's Edge election?
There's a proposed bill, AB 1790, that would phase it out and terminate all elections starting in 2028. As of mid-2026, that bill has stalled in committee and is not law. It faces a two-thirds supermajority requirement and strong business opposition, but it's a live enough threat that any startup considering the election now should factor in the uncertainty.
What happens if I have a foreign parent company or an overseas subsidiary?
That's exactly the situation where the Water's Edge analysis applies to you. Having a foreign affiliate in your unitary group means California's default worldwide reporting rule is in play, and the election becomes a genuine decision with real tax consequences. These cross-border structures get complicated quickly, so professional review is strongly recommended.
What's the difference between Water's Edge and worldwide combined reporting?
Worldwide combined reporting is California's default. It includes both your domestic and foreign affiliates when calculating the income apportioned to the state. Water's Edge is the elective alternative that excludes the foreign affiliates, narrowing the calculation to U.S. operations. The choice between them only exists for groups that actually have foreign members.
This article is for educational purposes only and does not constitute legal or tax advice. California tax law is complex and changes frequently. Consult a qualified tax professional about your startup's specific situation before making any election with the Franchise Tax Board.
