Finance category
Mortgage, loan, investing, tax, and money calculators.
Assessment Reassessment Trigger Calculator
Sales trigger reassessment. This calculator anticipates.
New tax estimate
$33,600
Tax increase
$19,200
New assessment
$2,800,000
How the math works
New assessment = min(sale price, sale × ratio cap). New tax = new assessment × rate.
$1.2M prior → $2.8M sale → $2.8M new assessment at 1.2% = $33.6k new tax vs $14.4k prior. $19.2k increase. Underwrite new tax in buyer's pro forma from day 1.
How to Use
- Enter prior assessment.
- Enter sale price.
- Enter ratio cap %.
- Enter tax rate %.
- Read new tax estimate.
Frequently Asked Questions
California Prop 13?
Reassessed only on sale or new construction. Between events: capped at 2% annual. Massive spread between market and assessed on long-held. New owner pays 'fresh' tax based on sale. Prop 19 amendments 2020 modified transfer exclusions.
Other states?
Most states reassess annually or cyclically. Sale generally triggers full reassessment. Some states 'welcome stranger' (reassess full market value on sale). Others gradual approach (ratio caps). Research jurisdiction before acquisition underwriting.
Tax shock?
Below-market assessed property sold to market-price buyer: tax spikes 2-5x typically. Buyer must underwrite at new tax level. Seller has been paying low-tax; buyer pays market-tax. Major component of acquisition economics.
How often should I rerun this?
Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.
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