Real Estate Tax Calc
Why San Francisco remains one of the nation’s most complex investment markets
San Francisco has long attracted real estate investors drawn to strong rental demand, tech-driven wage growth, and historically low vacancy rates. However, the city’s tax environment makes after-tax return modeling substantially more complex than most US markets. Investors face three layers of income taxation (federal, California state, and potentially the federal net investment income tax), an unusually aggressive transfer tax on high-value transactions, and strict rent control rules on many residential units that affect both income projections and exit strategy.
California’s progressive income tax structure — the highest top marginal rate in the US at 13.3% — means that investors in the upper brackets are paying a combined federal-plus-state marginal rate that can exceed 50% on ordinary income. Net rental income, which is taxed at ordinary income rates at both the federal and state level, is particularly affected. A San Francisco investor earning $100,000 in net rental income who is in the top federal bracket (37%) and top California bracket (13.3%) faces a combined rate approaching 50% before accounting for any additional Medicare surtaxes.
This guide explains the federal and California tax rules most directly relevant to San Francisco investment property owners: Proposition 13 property taxes, California income taxes on rental income, the Documentary Transfer Tax, California’s depreciation rules, capital gains treatment, and the federal net investment income tax.
Proposition 13 and San Francisco property taxes
California’s Proposition 13, enacted in 1978, fundamentally shapes the property tax cost of owning investment real estate in San Francisco. The law caps the ad valorem property tax rate at 1% of assessed value and limits annual increases in assessed value to no more than 2% per year. The assessed value is reset to the current market value at the time of purchase or when new construction is completed. This reset is called a “change in ownership,” and it triggers a reassessment at the San Francisco Assessor-Recorder’s Office.
For an investor purchasing a San Francisco multifamily property at $1,500,000, the base year assessed value is $1,500,000. The base property tax at the 1% rate is $15,000 per year in year one. Each subsequent year, the assessed value can increase no more than 2% per year (so $1,530,000 in year two, $1,560,600 in year three, and so on), regardless of how much the market value increases. This creates significant property tax stability for long-term holders but means new buyers face the highest initial tax relative to long-held properties in the same neighborhood.
Beyond the 1% base rate, San Francisco investors pay voter-approved bond assessments on top of the base rate. These are parcel-specific charges that fund school districts, the city college, affordable housing bonds, and other local programs approved by San Francisco voters. In aggregate, these assessments typically add 0.1% to 0.2% to the effective property tax rate. The San Francisco Assessor’s Office posts the full tax rate for each specific parcel online, and investors should review the actual bill — not just the 1% headline rate — when underwriting a purchase.
San Francisco’s Documentary Transfer Tax
San Francisco imposes a graduated Documentary Transfer Tax (DTT) on real property sales that is far more progressive — and for high-value properties, far more costly — than the standard California county transfer tax. While most California counties charge a flat transfer tax of $1.10 per $1,000 of sale price (0.11%), San Francisco’s rates rise steeply with the transaction value.
The San Francisco DTT rate structure applies to the full sale price and is tiered as follows: 0.5% on the portion up to $250,000; 1.5% on the portion from $250,000 to $999,999; 2.5% on the portion from $1,000,000 to $4,999,999; 3.0% on the portion from $5,000,000 to $9,999,999; 5.5% on the portion from $10,000,000 to $24,999,999; and 6.0% on the portion above $25,000,000. For a $1,500,000 investment property sale, the approximate San Francisco transfer tax is: $250,000 × 0.5% = $1,250; $750,000 × 1.5% = $11,250; $500,000 × 2.5% = $12,500; total = approximately $25,000. At this rate, the transfer tax alone on a modest San Francisco multifamily is a significant transaction cost that must be modeled into exit projections.
By custom in San Francisco, the seller typically pays the transfer tax, but the allocation is negotiable. For investment property transactions, the transfer tax paid by the seller is deductible as a selling expense on the seller’s federal return, reducing the amount realized and therefore the taxable gain. Buyers who contractually assume the transfer tax add it to their cost basis in the property.
California income tax on San Francisco rental income
California taxes net rental income at ordinary income rates. The California income tax rate schedule for individuals ranges from 1% at the lowest bracket to 9.3% starting at approximately $66,295 for single filers (as of recent years; brackets are adjusted periodically for inflation). The rate rises further to 10.3% above approximately $338,639 and to 11.3%, 12.3%, and ultimately 13.3% at the highest income levels. The 1% Mental Health Services Tax surcharge adds the extra 1% above the base 12.3% to create the 13.3% top rate.
Because California taxes rental income at ordinary rates, there is no California-level benefit to the long-term holding period that produces preferential capital gains rates at the federal level. An investor selling a San Francisco rental property after ten years will pay federal capital gains tax at the preferential 15% or 20% rate (depending on income), but will owe California income tax on the same gain at rates up to 13.3%. The combined federal-plus-California effective rate on a long-term gain for a high-income investor can exceed 30%.
California also conforms to the federal passive activity loss rules under IRC §469. Net rental losses from investment property (where your rental expenses, including depreciation, exceed your rental income) are generally passive losses that can only offset other passive income or are suspended until you sell the property or materially participate. Investors cannot deduct passive rental losses against ordinary W-2 or business income unless they qualify as real estate professionals under the IRC §469(c)(7) exception, which requires more than 750 hours of real estate activities annually and more time in real estate than any other profession.
California’s depreciation conformity issues
California generally conforms to the federal depreciation rules for residential rental property (27.5-year straight-line under MACRS) and commercial property (39-year straight-line). However, California does not conform to the federal bonus depreciation provisions of IRC §168(k), which allow investors to immediately deduct a percentage of the cost of qualifying property in the year it is placed in service. The bonus depreciation percentage has varied over time under federal law; California has not conformed to any of these provisions.
The practical effect for San Francisco investors is that federal and California returns will show different depreciation deductions. If you claim bonus depreciation on your federal return for qualifying personal property (appliances, equipment, certain improvements), you must add that amount back on your California Schedule CA. California then allows you to deduct the regular depreciation on a straight-line schedule over the asset’s California useful life. This creates a “timing difference” — larger federal deductions early in the asset’s life, followed by larger California deductions later — that resolves over the full depreciation period.
California also limits the IRC §179 expensing election differently than federal law in some years, though the two have been more closely aligned in recent years. Investors with significant personal property placed in service should verify current California conformity to the federal Section 179 limits with a California CPA or tax advisor.
Worked example: $1,500,000 SF multifamily
Consider an investor who purchases a four-unit San Francisco multifamily building for $1,500,000. The building constitutes approximately 80% of the purchase price, with 20% attributable to land (land is not depreciable). The depreciable basis is therefore $1,200,000.
Annual depreciation (federal and California): $1,200,000 ÷ 27.5 years = $43,636 per year. (No bonus depreciation is applicable to residential rental property for the building itself; bonus depreciation on personal property components is a separate analysis.)
Year 1 property tax: Base 1% × $1,500,000 = $15,000. Plus estimated SF bond assessments of approximately $1,800 to $3,000 depending on the specific parcel. Total estimated property tax: approximately $16,800 to $18,000 in year one. Annual property tax increases are capped at 2% under Proposition 13.
Annual rental income: Assume $7,500 per month total rent across four units, or $90,000 annual gross rent. After operating expenses (property management, insurance, maintenance, property tax — but before depreciation) of approximately $30,000, net income before depreciation is $60,000.
Federal Schedule E: $60,000 − $43,636 depreciation = $16,364 net taxable income. Federal tax at 22% (middle bracket for illustration): approximately $3,600.
California income tax: $16,364 × 9.3% (California 9.3% bracket for moderate income): approximately $1,522 per year.
Transfer tax at purchase (seller cost): On a $1,500,000 purchase, the San Francisco DTT paid by the seller is approximately $25,000. The buyer’s closing costs include title insurance, escrow fees, and lender costs, but typically not the transfer tax unless negotiated.
Federal net investment income tax (NIIT): If the investor’s modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly), a 3.8% NIIT applies to the lesser of net investment income or the excess MAGI over the threshold. For an investor at these income levels, the additional NIIT on $16,364 net rental income would be approximately $621.
Federal Net Investment Income Tax and high-income SF investors
The federal Net Investment Income Tax (NIIT) of 3.8% applies to the lesser of an individual’s net investment income or the excess of modified adjusted gross income over applicable thresholds ($200,000 for single filers, $250,000 for married filing jointly as of current law). Net rental income from investment property is generally included in “net investment income” unless the investor qualifies as a real estate professional, in which case the activity is treated as non-passive and excluded from the NIIT calculation.
For San Francisco investors who are also high earners in the tech industry or other high-wage professions, the NIIT is a significant additional cost layer. A San Francisco investor with $500,000 in total income who earns $60,000 in net rental income faces: federal ordinary income tax at up to 37%, California income tax at up to 13.3%, and the 3.8% NIIT on the net investment income portion. The combined marginal rate on rental income for a top-bracket investor exceeds 54% before state capital gains rates are considered.
Strategies to manage this include maximizing deductible expenses (ensuring all ordinary and necessary expenses are claimed on Schedule E), accelerating depreciation deductions through cost segregation studies on qualifying components, and structuring the portfolio to qualify for real estate professional status if the investor dedicates substantial time to real estate activities.
San Francisco gross receipts tax on rental activities
San Francisco imposes a gross receipts tax on businesses operating in the city. For most passive residential rental activity by an individual investor (owning and renting a few apartment units as an investment), the gross receipts tax does not typically apply. Passive rental income from residential properties held as investments is generally not considered a “business” for gross receipts tax purposes.
However, investors who operate at a scale more consistent with an active rental business — managing a large portfolio of units, providing substantial services to tenants, or operating short-term rentals — may have San Francisco gross receipts tax obligations. The San Francisco Office of the Treasurer & Tax Collector publishes detailed guidance on which activities trigger registration and filing obligations. Investors at the margin should consult a San Francisco tax attorney or CPA who specializes in the city’s tax rules.
Common mistakes San Francisco investors make
Modeling after-tax returns using only federal tax rates. The California income tax at rates up to 13.3% is a real cost that dramatically affects cash-on-cash returns for high-income investors. A model that uses only the 20% federal capital gains rate and 37% ordinary income rate is missing the California layer entirely. Always run dual-column federal/California projections before committing to an acquisition.
Ignoring the transfer tax on exit. San Francisco’s graduated Documentary Transfer Tax can be 2.5% to 3.0% on the full sale price of a typical million-dollar-plus investment property. On a $2,000,000 sale, the transfer tax alone can be $42,500 or more. This cost reduces net proceeds and must be included in your exit underwriting from day one.
Claiming federal bonus depreciation without the California addback. Investors who use tax software or work with preparers unfamiliar with California conformity issues sometimes miss the California bonus depreciation addback. This results in a California underpayment and potential penalties and interest. Verify that your California Schedule CA properly reflects the addback of any federal bonus depreciation claimed.
Overlooking rent control implications for exit strategy. San Francisco’s rent control rules (which apply to most residential units built before June 13, 1979) can significantly affect a property’s market value to other investors at exit. Properties with long-term below-market tenants protected by rent control may sell at a discount to market-rate properties. Model multiple exit scenarios including tenant turnover, tenant buyouts, and the Ellis Act process when evaluating an SF investment.
Frequently asked questions
Does California have a preferential capital gains rate for real estate?
No. California taxes all capital gains, including long-term gains from real estate sales, as ordinary income at the same rates as other income. The top California rate is 13.3%. This is a significant difference from the federal treatment, where long-term capital gains are taxed at preferential rates of 0%, 15%, or 20%. A San Francisco investor selling a property at a long-term gain will pay preferential federal rates but full ordinary income rates in California.
How does Proposition 13 work for a newly purchased SF investment property?
When you purchase an investment property in San Francisco, the assessed value is reset to the purchase price. Your annual property tax is calculated at 1% of that assessed value plus any voter-approved bond assessments, which in San Francisco typically add 0.1% to 0.2%. The assessed value can increase no more than 2% per year until the next change of ownership or new construction event — providing long-term holders with predictable, slowly-increasing tax bills regardless of market appreciation.
What is San Francisco’s Documentary Transfer Tax?
San Francisco imposes a graduated Documentary Transfer Tax on real property sales. Rates increase with the sale price: 0.5% up to $250,000; 1.5% from $250,000 to $999,999; 2.5% from $1 million to $4.99 million; 3.0% from $5 million to $9.99 million; 5.5% from $10 million to $24.99 million; and 6.0% above $25 million. The tax is typically a seller cost but allocation is negotiable in the purchase contract. For a $1,500,000 property, the total transfer tax is approximately $25,000.
Does California conform to federal bonus depreciation?
No. California does not conform to the federal bonus depreciation rules under IRC Section 168(k). Any bonus depreciation deduction taken on your federal return must be added back on your California return (Schedule CA). California applies its own straight-line depreciation schedule over the asset’s useful life. This creates a temporary difference that reverses over time as California straight-line depreciation catches up to the federal accelerated amounts. The result is higher California taxable income in the early years of ownership.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.