Self-storage property tax reassessment: underwrite your tax bill, not the seller's

Why the seller's tax bill often understates yours

The tax line on a seller's T12 reflects the seller's assessment, which may be years or decades old. Three things commonly push the buyer's bill higher.

• Sale-triggered revaluation. A recorded sale gives the assessor fresh evidence of value. Many jurisdictions use it at the next assessment, and some are required to.
• Assessment caps that reset on transfer. Some states limit how fast an assessment can rise while the owner stays the same, then reset to market value when ownership changes. A long-held facility in one of these states can carry an assessment far below its market value.
• Owner-specific items. A seller's bill can include an exemption, a negotiated or appealed value, or a phase-in that will not carry over to you.

Two state examples, from official sources

California. The State Board of Equalization explains that Proposition 13 requires the county assessor to reassess property to its current fair market value as of the date ownership changes, and generally limits annual increases in the base year value to no more than 2 percent otherwise. The tax rate is 1 percent plus voter-approved debt levies. The reassessment takes effect through a prorated supplemental assessment for the rest of the fiscal year, rather than waiting for the next January 1 lien date, so expect a supplemental bill after closing. The BOE also runs a program to find changes in control or ownership of legal entities that own California property and tells county assessors to reappraise them, so buying the LLC rather than the real estate is not a reliable way around reassessment.

Florida. Under section 193.1555 of the Florida Statutes, nonresidential property is assessed at just value as of January 1 of the year after a change of ownership or control, including a cumulative transfer of more than 50 percent of the entity that owns it. Between changes, the Florida Department of Revenue says non-homestead assessed values cannot rise more than 10 percent a year. That limit applies to levies other than school district levies.

Other states handle this differently, and some revalue all property on a fixed cycle regardless of sales. Ask the assessor how a sale is treated where your facility sits.

How to estimate the post-sale tax bill

1. Market value. Start with your purchase price. Ask whether the assessor removes non-real-estate items such as business value or equipment, and whether it values commercial property on an income approach.
2. Assessment ratio. Some states assess commercial property at a fraction of market value. Others assess at 100%. The assessor's office will tell you.
3. Tax rate. Add up every levy on the parcel: county, city, school district and special districts. One mill is $1 of tax per $1,000 of assessed value. The treasurer or tax collector publishes current rates, which change every year.
4. Timing. Find out when the new value takes effect and when the first higher bill arrives. It may land after closing prorations have been settled on the old bill.

Worked example: what the reassessment does to NOI, value and DSCR

Suppose a facility is offered at $5,200,000, a 7.00% cap on the seller's NOI of $364,000. The seller pays $31,200 in property tax on an old assessment. In this hypothetical county, commercial property is assessed at 35% of market value and the combined levy is 45 mills. Assume the assessor adopts your purchase price as market value.

The new bill is $5,200,000 × 35% × 45 ÷ 1,000 = $81,900, an effective rate of 1.575% of the price and $50,700 more than the seller pays. That $50,700 comes straight out of NOI. At the same 7.00% cap, it removes $724,286 of value, and the loan that looked comfortable at 1.18x barely covers its payments at 1.01x. Many lenders size loans to a minimum DSCR, so a reassessment can shrink the loan as well as the value. Ask your lender how it underwrites taxes.

Run your own numbers in the cap rate calculator, which shows value and implied cap on the seller's taxes and after reassessment, or in the Deal Analyzer, which carries the post-sale bill through DSCR and returns.

Pricing around the reassessment: the tax-loaded cap rate

The example has a loop in it. The price you pay sets the new assessment. The assessment sets the tax. The tax sets your NOI, and your NOI sets the price you should pay. If the assessor will value the property at your price, you can solve for a price that hits your target cap rate after the new tax, by adding the effective tax rate to the cap rate:

In the example, NOI before property tax is $364,000 + $31,200 = $395,200. The effective rate is 35% × 4.5% = 1.575%. For a 7.00% cap after reassessment:

That is about $590,000 below the asking price, and about $133,000 above the $4,475,714 you get by applying 7.00% to the post-tax NOI at the asking price. The difference comes from the fact that paying less also lowers the tax. Appraisers sometimes call this a tax-loaded cap rate. It works only where the assessor follows the sale price, so confirm that first.

Newmark's 2025 Self-Storage Almanac makes a related point about market data: when you compare cap rates, check whether the expenses, particularly real estate taxes, were adjusted to market. A comparable sale reported on the seller's old tax bill overstates the cap rate a buyer actually got.

Disclosure and non-disclosure states

In many states the sale price reaches the assessor with the deed, through a transfer-tax return or a sales disclosure form. In a non-disclosure state it may not. Texas is one: the Bastrop Central Appraisal District says it does not receive all sales information because Texas is a non-disclosure state, so it researches sales by contacting realtors, brokers, sellers and buyers, and releases sales data only to an owner or agent for a protest.

That does not make the tax bill stable. The Travis Central Appraisal District says it values property using comparable sales, income and cost data. A self-storage facility valued on an income approach can be revalued upward as its rents rise, whether or not the district knows your price. In a non-disclosure state, underwrite the value the district is likely to reach from income and market data, and treat any lag as upside, not a plan.

Assessment appeals

If the new value is too high, you can usually appeal, but deadlines are short and set locally. In California, supplemental assessments generally must be appealed within 60 days after the notice is mailed, with some county variations, according to the BOE. Texas calls the process a protest, filed with the appraisal review board by a statutory deadline.

• Separate what is not real estate. Part of a price can reflect business value, a management platform or personal property. Whether those can be excluded depends on state law; a tax consultant or attorney can tell you.
• Use your own income data. An assessor using an income approach may assume market rents and expenses. Your actual T12 and rent roll are evidence.
• Do not underwrite a win. Model the unappealed value and treat any reduction as upside.

Where to verify before you commit

• County assessor or appraisal district: current assessed and market values, the assessment ratio, whether a sale triggers revaluation, and whether commercial property is valued by income approach.
• County treasurer or tax collector: the current bill, the combined tax rate or mill levy, special assessments, payment dates and any delinquency.
• A local property tax consultant or attorney: how similar facilities were valued after recent sales and how appeals have gone. Ask how they charge before you engage one.
• Your lender: whether it underwrites your estimated bill or its own, which changes your loan size.

Put the verified estimate into your model before the letter of intent where you can, and into your due diligence list either way. The due diligence checklist covers the documents to request. These are estimates, and local rules change, so confirm them with the assessor and your tax adviser.

This guide is general education about self-storage underwriting, not investment, lending, tax or legal advice. Figures from third-party reports are cited with their dates and change over time.