San Mateo, CA
Tax preparation and planning for Roblox engineers managing post-IPO RSU concentration, Sony PlayStation executives with US/Japan cross-border income, Visa and Franklin Templeton comp plan participants, and mid-Peninsula tech households navigating equity, QSBS lookbacks, and potential SF gross receipts tax exposure. 20 miles up 101 from our San Jose office. Open 7 days a week.
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If you live in San Mateo and work at Roblox, Sony Interactive Entertainment, Visa, or Franklin Templeton, your tax return carries a specific set of complications that most general practitioners in the area are not set up to handle well. A Roblox engineer with shares that vested before the IPO may be sitting on a Section 1202 QSBS position worth several million dollars of excluded federal gain, but only if the lookback analysis confirms the company qualified at grant. A Sony PlayStation executive receiving compensation tied to the Japanese parent entity has to navigate the US-Japan tax treaty, potential FBAR obligations, and the foreign tax credit before the return is complete. A Franklin Templeton employee using their own employer's in-house financial planning faces a conflict of interest that an independent CPA can eliminate. These are not edge cases. For San Mateo, they are routine.
We are Silicon Valley Tax, a full-service tax and accounting firm with CPAs on the team, based in San Jose 20 miles south on 101. Our San Mateo client base has grown around the specific compensation structures and tax patterns of the mid-Peninsula employer concentration, from Hillsdale's corporate corridor to the Baywood and Aragon neighborhoods where many of these employees actually live. This page walks through the most common San Mateo tax situations we handle, the dollar stakes when they are mismanaged, and a worked example that shows what a Roblox engineer's return looks like from start to finish in a year with meaningful vesting activity.
Four things make San Mateo tax returns substantively different from a generic Bay Area return.
Roblox post-IPO concentration. Roblox went public via direct listing in March 2021. Employees who received stock options or RSUs before the IPO may hold shares with a cost basis far below the current market price, and some of that early stock may qualify for Section 1202 QSBS treatment if Roblox met the gross-asset test at the time of issuance. The $10 million federal exclusion per taxpayer (or 10 times adjusted basis, whichever is greater) is one of the most powerful provisions in the tax code, but it requires a fact-specific lookback that most tax preparers do not perform as a matter of routine. Post-IPO lockup expirations that dump a large block of gains into a single tax year also create quarterly estimated payment obligations that catch many Roblox employees off guard.
Sony's US/Japan cross-border structure. Sony Interactive Entertainment is headquartered in San Mateo, but the parent entity, Sony Group Corporation, is a Japanese public company. Employees in the US may participate in compensation plans tied to the parent, receive restricted stock or options on Sony Group stock denominated in yen, or have pension accruals under Japanese employment contracts from prior roles. Each of these creates a cross-border tax event. The Foreign Tax Credit on Form 1116 prevents double taxation, but computing it correctly requires proper sourcing of income between the US and Japan, an assessment of treaty positions, and a decision on whether to claim the credit or the deduction. Getting this wrong costs real money in either direction.
Visa dividend qualification and stock plan mechanics. Visa is a Delaware corporation whose stock is NYSE-listed, so qualified dividends are straightforward. But Visa's senior compensation packages frequently combine RSUs, performance share units (PSUs), and non-qualified stock options, each with different tax timing, withholding mechanics, and planning windows. PSUs vest on performance conditions, not just time, which means the taxable amount is uncertain until the vest date. Layering multiple equity instruments with different basis-tracking requirements across a single tax year is exactly the kind of situation where a spreadsheet approach to basis management breaks down.
Franklin Templeton conflict of interest. Franklin Templeton manages roughly $1.5 trillion in assets across hundreds of mutual funds and ETFs. Employees of the firm who use Franklin's in-house wealth management services for their own financial planning are receiving advice from people whose compensation is tied to Franklin's product sales. An independent tax CPA has no investment-product relationship and no incentive to recommend a Franklin fund over an index fund or a direct indexing separately managed account. The tax planning question of whether to hold Franklin products inside a taxable brokerage versus a Roth IRA, and how to sequence liquidations for tax-loss harvesting, should be answered without that conflict in the room.
Section 1202 of the Internal Revenue Code is the provision that can make the first $10 million of gain from selling qualified small business stock completely federal-tax-free. To qualify, the stock must have been acquired at original issuance from a C-corporation with gross assets under $50 million at the time of issuance, and must be held for more than five years. For Roblox employees who received stock in the early years before the company scaled aggressively, the gross-asset threshold may have been met. The company crossed $50 million in gross assets at some point during its growth phase, which means there is a hard cutoff date: stock issued before that date potentially qualifies; stock issued after does not.
The lookback analysis requires pulling the Roblox equity plan documents, the issuance dates for each stock or option grant, and Roblox's financials at the time of issuance to confirm the gross-asset test was met. This is work that a tax preparer filling out a return in April without the underlying documentation cannot do reliably. If a Roblox employee sells a qualifying position and does not claim the Section 1202 exclusion, they pay federal capital gains tax on a gain that was legally excludable. If they claim the exclusion incorrectly, they owe back taxes, interest, and penalties on audit. The stakes are high enough that this analysis deserves a dedicated engagement before any shares are sold.
One important California note: California does not conform to Section 1202. The state taxes the full gain at ordinary income rates up to 13.3%, regardless of whether federal excludes it. For a $5 million qualifying QSBS gain, federal tax is zero and California tax is up to $665,000. That is still a favorable outcome, but it underlines why California residency is a material input to the QSBS decision. Some taxpayers with large qualifying positions consider relocating before a sale, which triggers its own California exit-tax analysis under Revenue and Taxation Code Section 18601 (the "safe harbor" residency rules). We cover both the federal exclusion mechanics and the California residency overlay in our post-IPO tax strategy framework.
The Foreign Tax Credit is designed to prevent the same income from being taxed twice, once by a foreign government and once by the US. For Sony employees in San Mateo who have Japanese withholding on parent-entity compensation or who held prior employment in Japan, Form 1116 is the mechanism. But the form is not straightforward.
Income must be correctly sourced between foreign and domestic baskets. The passive basket, the general basket, and the foreign branch basket each have separate credit limitation calculations. Japanese withholding taxes on dividend income from Sony Group stock are passive-basket credits. Compensation income from a Japanese employer (for prior periods) is general-basket income. Mixing baskets or computing the limitation incorrectly produces either an understated credit (you overpay) or an overstated credit that is reversed on audit.
The US-Japan income tax treaty also creates treaty elections that can shift the applicable tax rate on certain types of income. For Sony employees who receive Japanese pension distributions after returning to the US, the treaty determines whether the distribution is taxed at source in Japan, in the US, or both with a credit. These treaty positions must be reported on Form 8833 (Treaty-Based Return Position Disclosure) when the treaty overrides the default Code result. Leaving the 8833 off when it is required is itself a $1,000 penalty per occurrence.
FBAR and Form 8938 obligations also apply to Sony employees who maintained Japanese bank or brokerage accounts. FBAR's $10,000 aggregate threshold is low enough that a yen savings account with a modest balance triggers it. Most employees with any Japanese financial account footprint will owe both FBAR and Form 8938 as a US tax resident.
The RSU withholding gap is the single most reliable source of April tax bills for mid-Peninsula tech employees, regardless of employer. Here is how it works.
When restricted stock units vest, your employer withholds federal income tax at the IRS supplemental wage rate: 22% on the first $1 million of supplemental wages in the year and 37% above. But if your total income puts you in the 32% or 35% federal bracket, the 22% withholding rate leaves 10 to 13 percentage points uncovered on every dollar of RSU income below the $1 million threshold. California withholds at 10.23% on supplemental wages, but the actual California marginal rate for high-income San Mateo residents is 12.3% or 13.3%. The state gap, while smaller, is still real.
For a Visa senior employee with $350,000 of RSU income below the $1 million supplemental cap, the federal gap at 32% marginal is $35,000. For a Roblox engineer with $500,000 of RSUs in a vest-heavy year, the gap at 35% marginal is $65,000. Neither of those numbers shows up in payroll withholding. They appear as a balance due on April 15 and, if no estimated payments were made, as an underpayment penalty on top of the tax owed.
The fix is quarterly estimated payments. We model the gap in Q1 when the vesting schedule for the year is known, and set up Q2, Q3, and Q4 estimates to cover it without overpaying. Overpaying is not a disaster, but it is an interest-free loan to the government when that money could be in a money market fund or a Roth contribution instead.
A subset of San Mateo residents commutes to San Francisco employers, particularly to companies headquartered in SoMa. Others work fully remotely for SF-based employers from a San Mateo home office. The SF gross receipts tax introduces a city-level business tax exposure that many individuals do not think of as relevant to them but can be.
SF's gross receipts tax applies to businesses engaged in business in the city, with nexus determined by where the business activity occurs. For individual consultants, freelancers, or sole proprietors whose clients are in SF, the receipts from those clients may be sourced to SF. Employees of SF-based companies who work from San Mateo home offices most of the time are generally not subject to SF gross receipts tax on their W-2 wages, because the employment relationship is between the employee and the employer, not a business the employee operates in SF. But independent contractors billing SF clients from a San Mateo home office are in a different position.
The planning question for consultants and freelancers is whether the work is actually being performed in San Mateo (which would not be subject to the SF tax) or in SF (which would be). Work location documentation matters: where do you attend client meetings, where do you actually sit when you do the billable work, and where are your contracts formally executed. A defensible work-location record, combined with appropriate registration or exemption from SF's business registration, can eliminate this exposure cleanly. Our individual tax services page covers the California local tax analysis in more detail.
Franklin Templeton's San Mateo headquarters employs portfolio managers, analysts, and senior executives who receive equity compensation in the form of Franklin Resources stock (BEN on NYSE), performance shares, and deferred compensation tied to fund performance. This creates a situation that is less common elsewhere: the employees of a financial services firm are holding equity in the same company that manages products their clients own.
From a tax standpoint, the mechanics are similar to any other publicly traded company's RSU and PSU program. BEN RSUs vest and create ordinary income. A sale more than 12 months after vest date creates long-term capital gain. What is different is the planning context: Franklin Templeton employees who want to diversify out of BEN stock have trading restrictions tied to blackout periods and compliance windows. Getting the timing right requires coordination between the equity award vesting schedule, the compliance trading window, and the tax year in which you want to recognize the sale.
Deferred compensation plans at firms like Franklin Templeton also create a separate set of tax issues. Non-qualified deferred compensation under a 409A plan is not taxed when earned; it is taxed when paid out, at ordinary income rates. The distribution election must be made before the end of the prior year. Changing a distribution election after the fact is restricted under 409A and can trigger immediate taxation plus a 20% excise tax on the entire deferred amount. For Franklin Templeton employees approaching retirement or an employment transition, the deferred comp distribution plan deserves its own stand-alone analysis well before any decision is made.
Marcus is a senior engineer at Roblox who lives in the Baywood neighborhood of San Mateo. He received his first stock option grant in 2018, before Roblox's gross assets crossed $50 million, and received additional RSU grants in 2020 and 2022. He holds a mix of ISOs from the 2018 grant, early-exercise 83(b) election shares, and post-IPO RSUs. He is married, filing jointly, with $280,000 of combined W-2 income from his salary and his spouse's salary, plus the equity income described below. 2025 equity events: 48,000 RSU shares vested between January and October. At an average vest-date price of $48, that is $2.3 million of ordinary income already on his W-2. He also sold his entire 2018 ISO block (80,000 shares, basis $0.12 per share) for $46 per share net of commissions in September 2025, recognizing $3.67 million of gain. He held the shares more than five years from the 2018 ISO grant date. What his return looks like done correctly:
1. Section 1202 QSBS analysis: The 2018 grant was from Roblox as a C-corporation. We pull Roblox's financials from 2018 and confirm gross assets were under $50 million at the grant date. The shares were held more than five years. The $3.67 million ISO gain is excluded from federal income under Section 1202 for Marcus's share (up to $10 million per taxpayer). Federal tax on that $3.67 million: zero. California tax: up to $487,510 at 13.3%. Not zero, but substantially reduced.
2. ISO AMT analysis: ISO exercises are a preference item for Alternative Minimum Tax. The spread between fair market value and exercise price at exercise is an AMT preference. For 2018 early exercises at $0.12 with FMV of roughly $1 per share, the AMT preference was small. We run the Form 6251 analysis to confirm there is no residual AMT liability from the exercise history, and that no AMT credit carryforward was lost.
3. RSU gap analysis: $2.3 million of RSU income. Federal supplemental withholding: 22% on the first $1 million ($220,000) and 37% on the remaining $1.3 million ($481,000) = $701,000 withheld. Their combined marginal rate at $2.58 million of taxable income (salary plus RSUs) is 37%. The RSU income alone carries a 37% marginal rate, so withholding on the portion above $1 million was accurate; the gap is only on the first $1 million where 22% was withheld but 37% is owed: a $150,000 gap on the salary-plus-first-$1M-RSU calculation. Q4 estimated payment handles it.
4. California sourcing: Marcus worked entirely in San Mateo throughout 2025. All income sources to California. No allocation relief.
5. Basis records for remaining shares: After selling the 2018 block and vesting 48,000 RSUs, Marcus still holds 2020 RSU shares (basis = vest-date FMV, various dates) and 2022 RSU shares (same). We organize the lot records in preparation for future sales to control for short-term versus long-term characterization.
6. Estimated payment catch-up: Q3 and Q4 estimated payments totaling $160,000 to cover the withholding gap on the first $1 million of RSU income. What it would have looked like missed: Skipping the Section 1202 analysis and filing the $3.67 million ISO gain as a long-term capital gain at 20% federal plus the 3.8% net investment income tax = roughly $872,000 of federal tax on income that was legally excludable. The cost of not doing the lookback was $872,000 in this scenario.
Our San Jose office is 20 miles south on 101, roughly a 25-minute drive on off-peak hours. San Mateo clients are welcome to handle the entire engagement virtually through our secure document portal, and many do. We cover the full San Mateo zip code footprint: 94401, 94402, 94403, and 94404. That includes Hillsdale and the corporate corridor along 101, the Aragon and Baywood hillside neighborhoods where many senior tech employees live, Beresford, Hayward Park, and the newer Bay Meadows mid-density development. We also regularly serve clients in neighboring Burlingame, Foster City, and Belmont whose employer and compensation patterns are similar.
Mid-year planning engagements are available for clients who want to scope the QSBS analysis, set up estimated payments, or model equity award vesting before the fourth quarter. The right time to run the QSBS lookback is before you sell, not after. The right time to set up estimated payments is Q1, not March of the following year when the underpayment penalty is already accruing.
Office: 2051 Junction Ave, San Jose, CA 95131
Phone: (408) 383-9870
Email: admin@siliconvalleytax.co
Hours: Mon-Fri 9am-6pm
Serves: San Mateo 94401, 94402, 94403, 94404; Burlingame, Foster City, Belmont, Redwood City, and the rest of the mid-Peninsula and South Bay.
Section 1202 of the Internal Revenue Code excludes up to $10 million (or 10 times basis) of gain from the sale of Qualified Small Business Stock from federal income tax, provided the shares were acquired at original issuance when the company had gross assets under $50 million and held for more than five years. For Roblox employees who received stock before the company crossed the $50 million gross-asset threshold, a lookback analysis can determine whether those shares qualified. The exclusion applies to federal tax only; California does not conform to Section 1202 and taxes the full gain at ordinary rates.
Sony employees in the US who receive compensation tied to Sony Group Corporation (the Japanese parent) may receive income subject to Japanese withholding or have employer pension accruals under the Japan corporate umbrella. US tax residents must report worldwide income, but can claim a Foreign Tax Credit on Form 1116 for Japanese taxes paid on the same income. Employees who participate in Sony's Japanese stock plans also need to assess whether those plans create PFIC exposure or foreign account reporting obligations under FBAR and Form 8938. The interaction between the US-Japan tax treaty and domestic law determines the optimal credit-versus-deduction choice.
Yes. RSU vesting is a taxable event for federal and California purposes regardless of whether you sell the shares. The fair market value of shares on the vest date is ordinary income, reported on your W-2. Visa withholds at the IRS supplemental rate of 22% on the first $1 million of supplemental wages and 37% above, plus California's supplemental withholding rate. If your marginal rate exceeds 22% federally or California's effective rate exceeds the supplemental rate, you will owe additional tax not covered by withholding. Quarterly estimated payments can prevent underpayment penalties.
Franklin Templeton is a large wealth management firm, and its in-house resources are designed for clients of the firm, not employees. Using Franklin Templeton's own financial planning services for your personal return creates a conflict when their products appear in your portfolio and tax planning. An independent CPA with no investment-product relationship can advise on whether Franklin's fund offerings are the right vehicle for your tax situation without any product conflict. This is especially relevant for Franklin employees who receive equity comp tied to firm performance and need objective advice on when to diversify.
San Francisco imposes a Gross Receipts Tax on businesses with nexus in the city based on gross receipts from business conducted in SF. Individuals who work remotely for SF-based employers or conduct consulting or freelance work billed to SF clients may have nexus. If you live in San Mateo and work primarily from a home office for an employer headquartered in SF SoMa, careful documentation of your work location can reduce or eliminate the apportionment of income to SF, reducing your SF gross receipts tax exposure. This requires proper payroll sourcing and a defensible work-location log.
A lockup expiration that releases a large block of RSUs in a single year creates two separate tax events to manage: the ordinary income on vest (already on your W-2 at vest-date FMV) and the capital gain or loss on any subsequent sale. Selling immediately on vest locks in a wash of the two, but holding for 12 months converts further appreciation to long-term capital gain taxed at 0%, 15%, or 20% federal. The risk is concentration: holding Roblox stock post-vest is an undiversified bet on a single company. A sell schedule that diversifies over multiple quarters, using the Roblox trading window, is often the better tradeoff between tax efficiency and concentration risk.
The Section 1202 QSBS window closes permanently once you sell without doing the lookback. The RSU withholding gap does not announce itself until April. The Sony foreign tax credit interacts with the treaty in ways that a general practitioner without cross-border experience routinely misses. The right time to address all of these is before year-end, not during filing season when the room to act is gone. Whether you live in Baywood, Aragon, Hillsdale, Bay Meadows, or anywhere else in the 94401 through 94404 zip code footprint, we serve the entire San Mateo area virtually and in person. Book a complimentary consultation and we will look at your last filed return, your equity award schedule, and any cross-border or local tax questions before quoting the engagement.
QSBS lookbacks, post-IPO RSU planning, Sony foreign tax credits, Franklin Templeton equity coordination. One firm, one engagement, no handoffs. Book a free 30-minute scoping call. Also serving nearby Redwood City and Palo Alto.