Tax Reset at Sale: The Line Item That Breaks 30% of Pro Formas

TL;DR

✦ Most US counties reset assessed value at sale. The seller's frozen basis does not transfer. ✦ Florida (homestead), California (Prop 13), Texas (SB2 caps) are the worst offenders. ✦ Average understatement on listings: $1,840/year. Lifetime cost on a 30-year hold: $55K+. ✦ The fix: pull the assessor before you offer. Compute the post-reset bill at the new market value.

How the reset works

Property taxes are based on assessed value. In most counties, that value is updated annually — but with caps that prevent it from rising too fast year-over-year. The result: a long-held property's assessed value lags far behind its market value.

When the property sells, the new owner triggers a reset. The county re-assesses at market (often the sale price). Your tax bill jumps.

The bigger the gap between the seller's assessed basis and the current market value, the bigger your jump.

States where it's worst

Florida (homestead exemption)

Florida residents claim a homestead exemption that caps annual assessment increases at 3% (Save Our Homes amendment). A property held 15+ years often has assessed value 30-50% below market.

When you buy as a non-homesteader (you don't live there), you lose homestead. Assessment resets to market. Your bill jumps 40-60%.

California (Prop 13)

Prop 13 caps annual assessment increases at 2% — period. Long-held properties have assessed values pinned to their 1980s or 1990s purchase price.

A property bought in 1995 for $180K and sold today for $1.2M will reset from $240K assessed (with 2% inflators) to $1.2M assessed. The tax bill goes from $2,400/year to $14,400/year.

Texas (SB2 caps)

SB2 (2019) caps annual assessment increases at 10% for residential. Less extreme than FL/CA, but still creates 15-25% gaps between assessed and market value over a 5-7 year hold.

Other moderate-impact states

• Georgia: assessment cap with homestead.
• South Carolina: 4% assessment ratio for owner-occupants, 6% for investors.
• Oregon: Measure 50 caps similar to Prop 13.
• New York: capped increases on 1-3 family homes (especially in NYC five boroughs).

How to compute the post-reset bill

Step 1. Find the county assessor portal. Search "[county name] property appraiser" or "[county] tax assessor."

Step 2. Look up the property by address. Note three numbers:

• Just/Market value (the appraiser's estimate of market price)
• Assessed value (the capped/protected number)
• Current tax bill (often shown directly)

Step 3. Compute the gap: Market − Assessed = the increase you'll see at sale.

Step 4. Multiply by the millage rate (also on the assessor portal). That's your annual tax delta.

Step 5. Add the delta to your monthly expenses (÷ 12).

Worked example: Miami SFR

Asking: $485K. Seller has owned 22 years.

Assessor data:

• Just/Market value (county estimate): $462K
• Assessed value (homestead-protected): $128K
• Current tax bill: $2,180/year

Reset math:

• New assessed = sale price = $485K (most FL counties use sale price for first-year reset)
• Old assessed = $128K
• Delta = $357K × 1.85% millage = $6,605 increase per year

New tax bill: $2,180 + $6,605 = $8,785/year, or $732/month.

The listing showed $182/month for taxes. The real expense is $732/month — a $550/month miss.

On the operator's underwriting, that single line item dropped projected cashflow from $610/mo to $60/mo. The deal still works marginally, but at the listed tax line it looked like a 6.8% CoC. At the real tax line it's 0.7% CoC. Walk-away decision.

The trap of "but my taxes will be lower"

New investors sometimes think: "I'm not the seller, I'll appeal the assessment, I'll find a way."

You can appeal. You'll lose. The assessor's basis is your sale price, and counties have years of legal precedent enforcing it. In FL, you may qualify for portability if you sold a homesteaded primary — but only as an owner-occupant, not as an investor.

Plan for the full reset. If the deal works at the reset bill, proceed. If it only works at the seller's protected basis, the deal doesn't work.

When the reset doesn't apply

A few cases avoid full reset:

• LLC-to-LLC transfers in some states (consult a CPA — usually triggers reassessment anyway).
• Inherited properties in CA (Prop 19, 2021) — limited carve-out for primary-residence inheritance.
• 1031 exchanges — basis transfers but property tax does not. Reset still applies.

For 95%+ of investor purchases, the reset is full.

Run this in Vricko

Vricko auto-pulls the county assessor for any address. The post-reset tax bill is computed from the assessment and millage automatically. The listing's tax line is shown side-by-side with the real number.

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The portfolio-level take

For investors with multi-state portfolios, build a tax-reset checklist by state. FL/CA/TX should always trigger an assessor pull before offer. Mid-impact states (GA, SC, OR, NY) on a 5-year+ held property — pull. Low-impact states (most Midwest) — usually safe to use the listing line, but spot-check.

Keep reading

• Insurance Doubled in FL/CA: What Your Pro Forma Must Show Now
• Every Seller Pro Forma is Marketing — Rebuild It
• The 8 Numbers Every Deal Must Pass

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