Tax Advisory Retainer: Year-Round Planning for Bay Area Executives and Founders

Every year, Bay Area tech employees with $500,000 of RSU income get a tax return from their CPA showing a $75,000 balance due. They knew vaguely that the withholding would not cover it, but they did not know it would be $75,000. By the time the number is on the return, the year is over. The RSUs vested at the price they vested at, the income was earned when it was earned, and the deductions were either taken or they were not. Filing the return is not planning. Filing the return is recording what already happened.

Real tax planning happens before the income is recognized, before the transaction closes, before the life event occurs. A tax advisory retainer is the relationship structure that makes proactive planning possible. At Silicon Valley Tax, a retainer client has a CPA who knows their full financial picture, is available for questions throughout the year, and reaches out when we spot something that needs attention before a deadline passes. This page explains what the retainer includes, what it costs in practical terms compared to reactive filing, and who it is designed for. Call (408) 383-9870 or book a consultation to discuss whether a retainer is the right fit for your situation.

The Problem With Annual-Only Tax Preparation

One-time annual tax preparation works well for straightforward situations: W-2 income, standard deduction, no significant investment activity. For Bay Area professionals with equity compensation, business income, real estate, or significant financial decisions during the year, the annual-only model is structurally broken for planning purposes.

Here is why. Tax law gives you a calendar year to manage your income and deductions. The strategies that reduce your tax bill, harvesting capital losses, timing accelerated deductions, managing RSU vest and exercise years, deferring income, maximizing retirement contributions, gifting appreciated stock, all have deadlines within that calendar year. Miss the December 31 deadline and the opportunity is gone until next year, if it recurs at all. An annual filing relationship where you hand over your documents in February gives your CPA zero opportunity to influence any of those decisions. They can only record what happened.

The gap shows up most painfully in four recurring Bay Area scenarios:

• RSU withholding shortfall: The default 22% withholding on RSU income leaves a four to fifteen percentage point shortfall for employees in the 35% or 37% bracket. Nobody sets up quarterly estimated tax payments without a conversation mid-year, and that conversation never happens in an annual filing relationship.
• ISO exercise year: Alternative minimum tax from exercising ISOs in a given year can be modeled and managed, but only if you know the exercise is coming. An annual-only preparer finds out about it when the Form 3921 arrives in January.
• Property sale: A 1031 exchange, installment sale, or QOZ investment can defer or eliminate gain on a real estate sale, but the structure must be in place before closing. Post-closing it is too late.
• Year-end bonus or tender offer: Knowing a large cash event is coming in December allows you to accelerate charitable deductions, contribute the maximum to a retirement account, or harvest losses to offset the gain. Without the conversation, you file the return and find out what it cost.

What the Advisory Retainer Includes

An advisory retainer with Silicon Valley Tax is structured around four categories of ongoing service:

1. Annual Tax Preparation

The retainer includes preparation and filing of the client's federal and California individual income tax return (Form 1040 and Form 540). For clients with business entities, the business return (Form 1120-S, Form 1065, or Form 568) is included in the professional and executive tiers. Extension filings, amended returns within the engagement period, and state returns for states where the client has a filing obligation due to physical presence or income sourcing are included in the base scope.

2. Quarterly Planning Calls

Four scheduled planning calls per year, one per quarter, each typically 30 to 45 minutes. These are structured conversations with an agenda, not status updates. The Q1 call covers year-end results and the current year projection. The Q2 call adjusts for any mid-year income events, updates the estimated tax model, and identifies any action items before the Q3 deadline. The Q3 call is often the most planning-dense: it is late enough in the year to have accurate income figures but early enough to execute strategies before December 31. The Q4 call finalizes year-end moves, confirms estimated tax payments, and starts the document checklist for filing season.

3. Real-Time Guidance on Transactions and Decisions

This is the part of the retainer that delivers the most value. When something happens during the year, a job change, a property purchase, a stock option exercise, an acquisition offer, a divorce, an inheritance, retainer clients call or email us before they act, not after. We respond with a tax analysis and a recommendation within one business day for straightforward questions and within 48 hours for complex matters requiring modeling. The retainer includes unlimited questions up to a defined time threshold; questions requiring extended research or modeling are flagged in advance.

The list of decisions where mid-year guidance changes the outcome is long:

• Whether to accept a cashout option or hold illiquid startup stock
• Which ISO shares to exercise, in what quantity, and in which calendar year
• Whether to sell RSUs at vest or hold, and how the holding period interacts with the withholding shortfall
• How to handle a lump-sum distribution from a qualified retirement plan after a job change
• Whether to do a Roth conversion in a year with lower-than-normal income
• How to structure a gift of appreciated stock to a donor-advised fund to maximize the charitable deduction
• Whether a home purchase triggers any tax issues (points deductibility, qualified mortgage interest under IRC Section 163)
• How a marriage or divorce mid-year changes the filing status and estimated tax obligations

4. Proactive Outreach

We do not wait for retainer clients to call us. When a new law changes a planning opportunity (the IRS issues guidance on a new deduction, Congress extends a provision, California changes a conformity date), we reach out to clients affected. When a deadline is approaching that requires action, we send a reminder with the specific action needed. When your Q3 call shows the year-end tax projection has changed materially from the Q1 model, we adjust the estimated tax recommendation without waiting for you to ask.

Tax Modeling: How We Build and Use Your Annual Projection

Every retainer engagement starts with building a tax model for the current year. The model incorporates:

• W-2 income and withholding by employer, projected for the full year
• RSU vesting schedule, projected vest values based on current stock price
• ISO and NSO exercise plans and their federal and California tax consequences, including AMT modeling
• Investment income: interest, dividends, and capital gain estimates from brokerage activity
• Business income: projected Schedule C or K-1 income from pass-through entities
• Real estate income and depreciation from rental properties
• Itemized deductions: mortgage interest, state and local taxes (SALT cap at $10,000), charitable contributions
• Retirement contributions: 401(k), IRA, SEP-IRA, or Solo 401(k) maximums and phase-outs
• California-specific items: CA SDI deduction, California source income adjustments

The model produces a full-year federal and California tax estimate, broken down by quarter for estimated tax payment scheduling. We update the model each quarter as actuals replace estimates. If the projection shows a balance due above a threshold we agree on in advance, we recommend increasing estimated tax payments to avoid underpayment penalties under IRC Section 6654 and California Revenue and Taxation Code Section 19136.

Estimated Tax Optimization: Getting the Quarterly Payments Right

The IRS safe harbor rules under IRC Section 6654 say that you avoid the underpayment penalty if you pay the lesser of 100% of the prior year tax (110% if prior year AGI exceeded $150,000) or 90% of the current year tax. Most Bay Area earners with variable income structures should target the 90% of current year amount because their prior year tax is based on a different income level.

The four federal estimated tax due dates are April 15, June 15, September 15, and January 15 of the following year. California conforms to these dates but with different percentages: California requires 30% of the annual amount by April 15, 40% by June 15, and 30% by January 15 of the following year (an unusual front-loading that surprises clients used to the federal schedule).

Bay Area employees with large RSU vests have an alternative: increase W-2 withholding by filing a new Form W-4 with their employer. Withholding is treated as if it was paid ratably across the year for underpayment penalty purposes, unlike estimated tax payments which are tested quarter by quarter. A well-timed withholding increase can cure an underpayment penalty for earlier quarters that estimated payments cannot fix.

Life Event Planning: When Tax Rules Change for You

The tax code treats major life events as trigger points for new rules and new opportunities. Retainer clients bring us into these conversations before the life event happens.

Marriage

Marriage changes filing status from single (or head of household) to married filing jointly or married filing separately. For Bay Area dual-income couples with high W-2 income, the marriage penalty is real: the combined tax on a jointly-filed return can exceed the sum of two single returns at the same total income because the 37% bracket threshold for married joint filers is less than double the single threshold. California has its own marriage penalty on incomes above $1,000,000. We model the tax cost of marriage and advise on whether married filing separately makes sense (it rarely does, but sometimes for clients with large itemized deductions that phase out based on AGI).

Divorce

Divorce creates a tax complexity burst. Division of equity compensation requires a qualified domestic relations order (QDRO) for retirement assets and specific handling for unvested RSUs (unvested RSUs are community property in California and the split affects when and how the income is taxed). Alimony payments under pre-2019 divorce decrees are deductible by the payer and taxable to the recipient; under post-2018 rules, alimony is neither deductible nor taxable. California conforms to federal law for post-2018 decrees. A divorce year usually requires separate estimated tax models for each party.

Home Purchase and Sale

A home purchase does not create tax savings automatically. The mortgage interest deduction requires itemizing, and the SALT cap of $10,000 under the Tax Cuts and Jobs Act has reduced the benefit of itemizing for California homeowners. However, points paid on a mortgage to acquire a primary residence are deductible in the year paid, and property taxes paid from escrow in the year of purchase are deductible within the SALT limit. On the sale side, the IRC Section 121 exclusion allows up to $250,000 ($500,000 for married couples) of gain to be excluded from income if the home was the principal residence for two of the five years before the sale. We track the two-year clock for clients who purchase during the engagement.

RSU Vests and Equity Liquidity Events

A single large RSU vest or an IPO lockup expiration can push income into the highest federal bracket (37%) and California's top rate (13.3%) in a single year. The timing of diversification sales after vesting creates a second taxable event: short-term capital gains tax applies if sold within one year of vest, long-term rates if held past one year. For clients with high volumes of RSU vesting, we build a sell-or-hold framework that accounts for the concentration risk, the tax rate differential between short and long-term gains, and the estimated tax payment implications of holding.

Retirement and Required Minimum Distributions

Retirement planning for high-income Bay Area professionals involves more than maximizing the 401(k) contribution. The decision about Roth versus traditional contributions is income-dependent: in years with high income and high marginal rates, pre-tax contributions defer tax at the high rate and produce the largest tax benefit. In years with lower income, a Roth conversion can move money into a tax-free bucket at a lower rate. Required minimum distributions from traditional IRAs and 401(k)s begin at age 73 under the SECURE 2.0 Act (IRC Section 401(a)(9)) and are taxed as ordinary income. We model the long-term impact of Roth conversions and RMD planning for clients approaching retirement age.

Who the Advisory Retainer Is Designed For

Not every client needs a year-round advisory retainer. Annual tax preparation serves straightforward situations well. A retainer makes economic sense when the potential tax savings in a given year are large enough to more than cover the retainer fee, and when the client's situation has enough moving parts that a one-time annual preparation misses planning opportunities. That profile generally includes:

• Senior tech employees with RSU income over $150,000 per year. The withholding shortfall and estimated tax complexity alone justify the engagement.
• Startup founders approaching a liquidity event. Pre-IPO planning, QSBS analysis under IRC Section 1202, founder stock sale structuring, and post-liquidity portfolio tax planning all require a year-round relationship.
• Real estate investors with multiple properties. Depreciation optimization, cost segregation studies, 1031 exchange timing, and passive activity loss planning require ongoing coordination.
• Executives with stock option plans (ISOs and NSOs). Multi-year exercise planning to manage AMT, estimated tax, and California tax requires a model that runs throughout the year.
• Business owners with pass-through entities. Quarterly estimated tax on business income, Section 199A deduction optimization, and entity tax planning require mid-year attention.
• High earners approaching or experiencing a major life event such as marriage, divorce, home purchase, inheritance, or retirement.

The Retainer Versus a Boutique Family Office

Wealth management firms and family offices offer tax planning services bundled with investment management. The bundled model has a built-in conflict: the investment decisions are made by the same firm that provides the tax advice, and the tax strategy is sometimes constrained by the investment strategy rather than the other way around. Silicon Valley Tax is a pure tax and accounting firm. We do not sell investment products, do not earn referral fees from financial advisors, and do not have a financial planning license that creates an incentive to steer you toward managed accounts. Our retainer is tax advice only. We coordinate with your financial advisor and estate attorney; we do not replace them.

Worked Example: A Retainer Year for a Senior Engineer

Client profile (composite, anonymized). David is a 42-year-old senior staff engineer at a public Bay Area company. Base salary $280,000. Annual RSU vests: 4,000 shares, vesting quarterly. Spouse is a physician with a W-2 of $350,000. Two rental properties, both break-even on cash flow but generating depreciation losses. Own a home purchased in 2021 with a $1.4M mortgage.

Q1 call: year-end review and projection. Prior year return shows $95,000 balance due, partly from a larger Q4 vest. We build the current year model with expected vest values and project a $110,000 balance due for the current year if no action is taken. We identify: the withholding on the W-2s covers roughly 58% of the projected liability. We set Q1 estimated tax at $27,500 (federal) and $12,000 (California) to start the year at the safe harbor pace.

Q2 call: mid-year adjustment. Company stock rose 18% in Q1. We rerun the RSU vest value projection. The new projection shows $128,000 balance due. We adjust Q2 estimated tax payments upward and review whether increasing W-2 withholding via a new Form W-4 makes more sense (it does for California, because the California penalty avoidance math is more forgiving with withholding than estimated payments). We also note the spouse's employer retirement plan allows after-tax contributions with an in-plan Roth conversion (the "mega backdoor Roth"). We model whether the current year income level makes the conversion worthwhile: it does, at about $15,000 of after-tax contributions per year.

Q3 call: year-end moves. Three months left in the year. We identify: the brokerage account has $42,000 of unrealized short-term losses in a position that has recovered partially. We recommend harvesting the loss before year-end to offset some of the RSU vest income. We also confirm the deadline for the donor-advised fund contribution of appreciated stock that David has been intending to make. The contribution needs to be in before December 31 to get the deduction in the current year.

Q4 call: close out the year. Confirm estimated tax payments. Confirm retirement contributions are maximized. Confirm W-4 adjustments are in effect for the December paycheck. Prepare the document checklist for filing season. Total estimated tax savings versus no-planning baseline for the year: approximately $31,000, most of it from the loss harvest and the timing of the DAF contribution.

Contact Information

Silicon Valley Tax
2051 Junction Ave, Suite 200
San Jose, CA 95131
Phone: (408) 383-9870
Email: admin@siliconvalleytax.co
Hours: Mon-Fri 8am-8pm, Sat-Sun 8am-6pm

Frequently Asked Questions

What is the difference between a tax advisor on retainer and annual tax preparation?

Annual tax preparation is backward-looking: you send documents in February, the CPA files by April 15, and the tax for the prior year is already fixed. A tax advisory retainer is forward-looking: your CPA knows your income trajectory and financial goals throughout the year and acts on planning opportunities while there is still time. The difference shows up most clearly when something happens mid-year. A retainer client calls us when the event occurs and we model the impact before the transaction closes. An annual-preparation client finds out what the event cost them when we file the return months later.

How does a tax advisory retainer help with RSU vesting and estimated taxes?

RSU vesting at high income levels creates a systematic withholding shortfall. Employers withhold at 22% federal on supplemental wages, but Bay Area tech employees in the 35% or 37% bracket owe significantly more. For an employee vesting $400,000 of RSUs, the withholding gap can exceed $50,000 in federal tax alone, plus California at 13.3%. We model your vesting schedule at the start of the year, set the correct estimated tax amounts for each quarter under IRC Section 6654's safe harbor rules, and update the model when vest prices or other income events change. The goal is a small balance due at filing, not a surprise six-figure bill.

I am about to sell a rental property. Can a tax advisor actually reduce what I owe?

Yes, but only if you engage before the sale closes. A 1031 exchange under IRC Section 1031 defers all gain by rolling proceeds into replacement property, with strict 45-day identification and 180-day closing deadlines. An installment sale under IRC Section 453 spreads gain recognition across multiple years. A Qualified Opportunity Zone investment via IRC Section 1400Z-2 can defer and partially exclude gain if proceeds are invested within 180 days. Charitable remainder trusts can diversify with a deferred deduction. None of these work after the sale closes. Calling a tax advisor the day escrow closes is too late.

What life events trigger the most significant tax planning opportunities?

The highest-value planning windows occur around: marriage or divorce (filing status and bracket shift, California community property, alimony treatment); a large equity liquidity event (IPO, tender offer, secondary sale); home purchase or sale (IRC Section 121 exclusion requires 2-year ownership and use test tracking); significant RSU vest or ISO exercise year; retirement and required minimum distributions (RMDs begin at age 73 under SECURE 2.0); and an inheritance (step-up in basis under IRC Section 1014, estate tax considerations). Most of these have planning windows that close at or before the event itself.

How is the advisory retainer structured and priced?

Our advisory retainers are structured as annual engagements with a fixed monthly fee paid in advance. The fee includes annual tax preparation for the individual return (and business return at higher tiers), four quarterly planning calls, unlimited email response for questions under 15 minutes, and priority scheduling for urgent matters. Complex transactions, additional returns, and extended project work are quoted separately. We offer three tiers: standard for employed professionals with straightforward income, professional for executives with equity compensation and investment income, and executive for founders and investors with multi-entity structures. Pricing is disclosed in the first consultation after we understand the scope of the engagement.

Taking the Next Step

The easiest way to evaluate whether an advisory retainer makes sense is a 30-minute conversation where we look at your income profile, identify the planning opportunities you may be leaving on the table, and give you an honest answer about whether the retainer would pay for itself in your situation. Many people walk away from that call with actionable steps even if they decide not to engage on a retainer basis.

If you are paying a large tax bill every year and wondering whether there was anything you could have done differently, or if you have a significant financial decision coming up and want a tax analysis before you act, call us at (408) 383-9870 or use the online booking form. In-person meetings at our San Jose office at 2051 Junction Ave are available seven days a week. Virtual meetings by Zoom are available for clients throughout the Bay Area and nationally.

Related services: entity formation for founders structuring their first business, CFO and advisory services for growing companies, and equity compensation tax services for tech employees with complex option and RSU situations.