California Mello-Roos CFD Tax Calculator

How this calculator works

California property tax under Proposition 13 (Cal. Const. Art. XIIIA § 1(a)) is capped at 1% of assessed value on the ad-valorem portion — but that 1% cap was never the whole story. The Legislature anticipated that the cap would starve new California subdivisions of infrastructure funding (schools, roads, parks, fire stations, water and sewer systems), so in 1982 it enacted the Mello-Roos Community Facilities Act, codified at Cal. Gov. Code §§ 53311–53368.3. Mello-Roos authorizes a city, county, or special district to form a Community Facilities District (CFD) and levy a special tax on every parcel inside the CFD to service bonds issued for that infrastructure. The special tax is layered on top of the Prop 13 1% base rate and does NOT count toward the 1% cap — because it is a special tax, not an ad-valorem tax.

This calculator projects the lifetime burden of a parcel-specific Mello-Roos special tax: it walks the current-year tax forward at the supplied annual escalator across the remaining bond term, reports the nominal cumulative cost and the present value at a 6% discount, expresses the special tax as an effective ad-valorem-equivalent percentage of purchase price for cross-parcel comparison, and combines with the Prop 13 base to surface the true first-year property-tax burden.

The four mechanics of Mello-Roos

1. Special tax, not ad-valorem (Cal. Gov. Code § 53340). The CFD tax is levied as a parcel-specific dollar amount set by the CFD's published Rate and Method of Apportionment (RMA) under § 53321(d) — typically a base amount keyed to lot size, building square footage, or land-use class, with a stated maximum annual escalator. It is collected on the regular county property-tax bill as a separate line item, but it is not based on assessed value and is not subject to the 1% Prop 13 cap under Cal. Const. Art. XIIIA § 1(a).

2. 2/3 vote to create (Cal. Gov. Code § 53326). A CFD is formed by a 2/3 supermajority of either (a) the registered voters residing within the proposed district at the time of formation, if 12 or more reside there; or (b) the property owners weighted by acreage owned, if fewer than 12 registered voters reside there. The property-owner vote is the typical mechanism because most CFDs are formed on raw undeveloped land where the developer is the only (or primary) landowner. The developer votes the entire acreage in favor; homebuyers later inherit the tax obligation when they purchase a parcel inside the formed CFD.

3. Maximum annual escalator (Cal. Gov. Code § 53321(d)). The RMA must specify a maximum annual special tax per parcel, which by California practice is set with a 2% annual escalator ceiling (mirroring but not legally tied to the Prop 13 2% assessed-value cap under Art. XIIIA § 2(b)). Some school CFDs adopt 4%; some service CFDs use the local CPI; some adopt 0% (a flat parcel charge that never escalates). The parcel-specific RMA controls — pull the actual figure before relying on the default.

4. Continuing lien + accelerated foreclosure (Cal. Gov. Code §§ 53356, 53356.1). The CFD special tax constitutes a continuing lien on the parcel that runs with the land. Nonpayment triggers an accelerated judicial-foreclosure remedy under § 53356.1 (60-day notice, superior-court action) — a substantially faster track than the regular 5-year ad-valorem property-tax delinquency timeline. The accelerated track exists because CFD bonds are sold to investors who need confidence that bond service is collectible.

A worked example — Roseville master plan

A buyer purchases a home in a Roseville master-planned subdivision for $750,000. The county tax bill shows a Mello-Roos line of $3,500 for the first year. The CFD's RMA specifies a 2% annual escalator and the bonds have 25 years of remaining service. The parcel's Prop 13 ad-valorem base property tax is $8,250 (1.1% of $750,000 — 1% Prop 13 base + 0.1% voter-approved bonds).

• First-year special tax: $3,500.
• Effective ad-valorem-equivalent rate: 3,500 / 750,000 = 0.47%.
• Total first-year property tax: $8,250 + $3,500 = $11,750.
• Combined first-year effective rate: 11,750 / 750,000 = 1.57%.
• Lifetime nominal total (sum over i=0..24 of 3,500 × 1.02^i): ≈ $112,106.
• Present value at 6% discount: ≈ $57,295.
• Year the special tax expires: 2026 + 25 = 2051.

That $112,106 nominal lifetime cost is on TOP of the Prop 13 ad-valorem burden, and it is a number that almost never appears on the buyer's MLS spreadsheet during the home search. The buyer who didn't read the seller's Notice of Special Tax and Assessment Lien before close (more on that below) is in for a multi-decade surprise.

A worked example — Irvine heavy CFD

A buyer purchases a home in an Irvine subdivision for $500,000. The Mello-Roos line is $5,500 (a heavier-than-typical CFD, common in Tier-2 school districts where the CFD funds specific school infrastructure on top of the basic municipal CFD). RMA escalator: 2%. Remaining bond term: 30 years.

• First-year special tax: $5,500.
• Effective rate: 5,500 / 500,000 = 1.10%.
• Lifetime nominal total (sum over i=0..29 of 5,500 × 1.02^i): ≈ $223,124.
• Present value at 6%: ≈ $99,644.

That parcel pays approximately the SAME amount in Mello-Roos as it pays in Prop 13 ad-valorem base tax. Over the 30-year bond term, the homeowner will pay roughly $223,000 in special tax on a $500,000 home — equivalent to nearly half the original purchase price. The effective combined property-tax burden (Prop 13 base + voter-approved bonds + Mello-Roos) runs about 2.2% of value annually — closer to a Texas or New Jersey property-tax rate than the California 1.1%–1.3% baseline.

Disclosure at sale — Cal. Civ. Code § 1102.6b

When a parcel inside a CFD is sold, the seller must deliver to the buyer a separate statutory document titled the "Notice of Special Tax and Assessment Lien" in addition to the standard Transfer Disclosure Statement. The notice must identify the formal name and number of the CFD, the current and maximum annual special tax, the date the tax was authorized, the bonded indebtedness outstanding, and (if known) the year the bonds will be fully paid off. This is required at every sale — Cal. Civ. Code § 1102.6b — and the seller's failure to deliver it is among the most-common bases for a post-closing disclosure claim against a California seller.

The disclosure is a separate document from the parcel's regular property-tax bill and from the TDS. It is the single most important Mello-Roos document for a buyer to read before closing — and the one most commonly skimmed past in a stack of closing disclosures.

The "Mello-Roos shock"

Buyers who don't read the § 1102.6b notice carefully — or whose listing agent forgot to deliver it altogether — routinely experience the "Mello-Roos shock" when their first county property-tax bill arrives in October or November of the year following purchase. The bill shows the Prop 13 ad-valorem amount (which the buyer expected, having seen the 1.1%–1.3% rate cited everywhere), and then a SEPARATE LINE for the CFD special tax — typically $3,000–$8,000 — which the buyer did not budget for. The shock is real: a $750,000 home in a Roseville CFD has a total annual property-tax bill closer to $12,000 than the $8,500 a buyer expected based on the headline "California property tax is capped at about 1.1%."

This calculator surfaces the combined first-year effective rate so the buyer can see the true burden before signing.

Early payoff and prepayment

Most California CFDs do NOT allow individual parcel owners to prepay their share of the bond. Some RMAs include a prepayment provision authorizing a lump-sum payoff of the parcel's allocated bond debt; whether it exists for a given parcel is set in the original RMA at CFD formation. Even where prepayment is permitted, it is rarely economically advantageous because the formula typically includes administrative fees and is computed at par rather than the market value of the underlying bonds. Verify with the CFD administrator before counting on it; for a parcel you are considering buying, plan on paying the special tax for the full remaining bond term.

Mello-Roos vs HOA fees

Mello-Roos is a government tax; HOA fees are private contract obligations. Many California master-planned subdivisions have BOTH — Mello-Roos for the public infrastructure built by the CFD, and an HOA for the private common areas built by the developer and conveyed to the HOA at buildout. Adding both to the Prop 13 base, a typical master-planned California subdivision can carry $3,000–$8,000/year in Mello-Roos PLUS $1,500–$5,000/year in HOA dues on top of the Prop 13 ad-valorem amount. Both are obligations of the parcel owner; both must be budgeted; neither is optional.

The two are also enforced differently. Mello-Roos non-payment triggers accelerated judicial foreclosure under Cal. Gov. Code § 53356.1 (60-day notice, superior-court action). HOA non-payment is collected by HOA-board lien recording under Cal. Civ. Code § 5675 followed by sale or foreclosure after a multi-month process. The Mello-Roos track is materially faster.

Federal deductibility — NO

Mello-Roos special taxes are not deductible on Schedule A as state and local property tax under IRC § 164. Treas. Reg. § 1.164-4(a) provides that special assessments levied for local benefits that tend to increase the value of the assessed property are non-deductible — and the IRS treats Mello-Roos as exactly that: a special assessment for specific local benefits (schools, roads, parks, sewer). California also disallows the deduction for state income-tax purposes per Cal. Rev. & Tax Code § 17201 (federal conformity).

Only the ad-valorem portion of the property-tax bill — Prop 13 1% base plus voter-approved general-obligation bonds under Art. XIIIA § 1(b) — is deductible (subject to the $10,000 SALT cap under TCJA). The Mello-Roos line on the bill is not. Owners regularly attempt to deduct the full annual amount on Schedule A and are corrected on audit.

Common errors

Four mistakes turn up routinely in Mello-Roos math:

1. Assuming the special tax counts toward the Prop 13 1% cap. It does not. Mello-Roos is layered on TOP of the 1% under Cal. Gov. Code § 53340, not folded into it.

2. Using the original CFD bond term instead of the remaining term. For a parcel being purchased mid-cycle, only the REMAINING bond service is the buyer's obligation. Pull the parcel-specific remaining term from the CFD administrator or the § 1102.6b notice.

3. Forgetting the escalator when projecting future cost. A 2% annual escalator over 30 years roughly doubles the special tax by the end of the term (1.02^30 ≈ 1.81). Linear projection (year × current tax) understates the lifetime burden by ~40% at typical California parameters.

4. Trying to deduct Mello-Roos as state and local property tax. Not deductible. Only the ad-valorem portion of the bill is — Mello-Roos must be excluded from the Schedule A figure.

How this page is maintained

The Mello-Roos Community Facilities Act of 1982 (Cal. Gov. Code §§ 53311–53368.3) has been the controlling statute since 1982 with substantial amendments in 1986, 1994, 2007 (the Mello-Roos Disclosure Act amendments), and 2017 (technical updates). The associated disclosure requirement at sale under Cal. Civ. Code § 1102.6b has been in effect since 1992. We monitor each California legislative session for amendments and refresh this calculator within 30 days of any enacted change.

Last reviewed: 2026-05-15 against Cal. Gov. Code §§ 53311–53368.3, Cal. Civ. Code § 1102.6b, and Cal. Const. Art. XIIIA § 1(a).