{
  "slug": "property-tax-appeal-value",
  "title": "Property Tax Appeal Value Calculator",
  "heading": "Property Tax Appeal Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/property-tax-appeal-value",
  "summary": "How much a successful assessment appeal is worth over the years you'll hold.",
  "description": "An over-assessment is a recurring overcharge, so the value of a successful appeal is not one year's saving but the saving multiplied by the years you keep the property, adjusted for how fast assessments creep back. This calculator computes the annual saving from a reduced assessed value, nets off filing fees and any consultant's contingency share, and projects the multi-year value. It also shows the effect on net operating income and, through the cap rate, the implied increase in the property's value — which is often several times the tax saving itself.",
  "formula": "Annual saving = (current assessment − target assessment) × tax rate × assessment ratio. Net first-year = saving − fees − contingency share. Value uplift = annual saving ÷ cap rate.",
  "dateModified": "2026-08-25",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=property-tax-appeal-value",
  "inputs": [
    {
      "id": "assessed",
      "label": "Current assessed value",
      "kind": "number",
      "hint": null,
      "default": 385000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "target",
      "label": "Assessment you're arguing for",
      "kind": "number",
      "hint": null,
      "default": 335000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "taxRate",
      "label": "Combined tax rate",
      "kind": "number",
      "hint": null,
      "default": 1.65,
      "unit": "% of assessed",
      "min": 0,
      "max": null
    },
    {
      "id": "ratio",
      "label": "Assessment ratio",
      "kind": "number",
      "hint": "Share of value that is taxable",
      "default": 100,
      "unit": "%",
      "min": 1,
      "max": 100
    },
    {
      "id": "fees",
      "label": "Filing and appraisal fees",
      "kind": "number",
      "hint": null,
      "default": 450,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "contingencyPct",
      "label": "Consultant's share of first-year saving",
      "kind": "number",
      "hint": null,
      "default": 40,
      "unit": "%",
      "min": 0,
      "max": 60
    },
    {
      "id": "years",
      "label": "Years you'll hold the property",
      "kind": "number",
      "hint": null,
      "default": 7,
      "unit": "years",
      "min": 1,
      "max": null
    },
    {
      "id": "creepPct",
      "label": "Annual assessment creep back",
      "kind": "number",
      "hint": null,
      "default": 2.5,
      "unit": "%",
      "min": 0,
      "max": null
    },
    {
      "id": "capRate",
      "label": "Market cap rate",
      "kind": "number",
      "hint": null,
      "default": 6,
      "unit": "%",
      "min": 0.5,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "multiYear",
      "label": "Value of the appeal over your hold",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "annual",
      "label": "Annual tax saving",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "firstYearNet",
      "label": "Net saving in year one after fees",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "valueUplift",
      "label": "Implied property value increase",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "currentBill",
      "label": "Current annual tax bill",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "newBill",
      "label": "Tax bill if the appeal succeeds",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Current assessed value: 385000 $",
      "Assessment you're arguing for: 335000 $",
      "Combined tax rate: 1.65 % of assessed",
      "Assessment ratio: 100 %",
      "Filing and appraisal fees: 450 $",
      "Consultant's share of first-year saving: 40 %",
      "Years you'll hold the property: 7 years",
      "Annual assessment creep back: 2.5 %",
      "Market cap rate: 6 %"
    ],
    "outputs": [
      "Value of the appeal over your hold: $4,579.48",
      "Annual tax saving: $825.00",
      "Net saving in year one after fees: $45.00",
      "Implied property value increase: $13,750.00",
      "Current annual tax bill: $6,352.50",
      "Tax bill if the appeal succeeds: $5,527.50"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter current assessed value ($).",
      "Enter assessment you're arguing for ($).",
      "Enter combined tax rate (% of assessed).",
      "Enter assessment ratio (%) — Share of value that is taxable.",
      "Enter filing and appraisal fees ($).",
      "Enter consultant's share of first-year saving (%).",
      "Enter years you'll hold the property (years).",
      "Enter annual assessment creep back (%).",
      "Enter market cap rate (%).",
      "Read your value of the appeal over your hold on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "assessed": 230000,
        "target": 200000,
        "taxRate": 0.9899999999999999,
        "ratio": 60,
        "fees": 275,
        "contingencyPct": 25,
        "years": 4,
        "creepPct": 1.5,
        "capRate": 3.5999999999999996
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "assessed": 385000,
        "target": 335000,
        "taxRate": 1.65,
        "ratio": 100,
        "fees": 450,
        "contingencyPct": 40,
        "years": 7,
        "creepPct": 2.5,
        "capRate": 6
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "assessed": 615000,
        "target": 535000,
        "taxRate": 2.64,
        "ratio": 100,
        "fees": 725,
        "contingencyPct": 60,
        "years": 11,
        "creepPct": 4,
        "capRate": 9.600000000000001
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "What evidence wins an assessment appeal?",
      "a": "Comparable sales of similar properties assessed lower, a recent arms-length purchase price below the assessment, documented condition problems, and errors in the record such as wrong square footage or bedroom count. Record errors are the easiest wins because they are factual rather than argued."
    },
    {
      "q": "Why does the property's value go up if taxes go down?",
      "a": "Because income properties are priced off net operating income, and property tax is an operating expense. Removing a recurring expense raises NOI permanently, and dividing that increase by the market cap rate gives the capitalised value — often many times the annual saving."
    },
    {
      "q": "Is a contingency-fee consultant worth it?",
      "a": "Frequently yes for commercial and higher-value residential, where the process is technical and the sums are large. They take a share of the first year only in most arrangements, while you keep every subsequent year — which is why the multi-year figure here matters more than the first-year net."
    },
    {
      "q": "Can appealing raise my assessment?",
      "a": "In most jurisdictions a review can adjust the value in either direction, though an increase is uncommon when your evidence is sound. The real risk is filing without comparable support on a property that is genuinely under-assessed — check the comps before you draw attention."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/rental-cap-rate",
    "https://www.revenuelab.fyi/toolbox/rental-hold-irr",
    "https://www.revenuelab.fyi/toolbox/rental-cash-flow"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Property Tax Appeal Value Calculator (https://www.revenuelab.fyi/toolbox/property-tax-appeal-value)"
}