Property-tax projection

Property Tax Calculator

Estimate annual property tax and project it across multiple years as the assessed value changes.

Assessment and tax inputs

Enter the property-tax assumptions

Property tax
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Tax projection

Estimated property-tax schedule

Your property-tax projection will appear here

Enter the assessed value, tax rate, starting year, annual assessment change, and projection length.

What Does the Property Tax Calculator Estimate?

Estimate annual property tax, a monthly budgeting amount and a multiyear total using your assessed value, tax rate and assumed annual assessment change.

Property tax is a recurring charge on real estate. This calculator starts with a value you enter, applies one annual tax rate and projects later years as that value rises or falls. Homeowners and buyers can use it to compare budget scenarios before reviewing the actual assessment and bill.

It does not look up a county or ZIP code, select a local tax rate or calculate exemptions. The results are estimates for the assumptions entered, rather than an official amount due. The value and rate must refer to the same tax base.

How to Enter Your Assessment and Tax Rate

  1. Current assessed value: enter the starting value in dollars. Check the local assessment notice. If the authority taxes a value after exemptions or other adjustments, use that taxable value for a matching rate; this tool cannot calculate those adjustments for you.
  2. Property tax rate: enter the annual percentage, such as 1.25 for 1.25%. A rate quoted in mills must first be divided by 10. For a rate of 12.5 mills, enter 1.25, rather than 12.5 or 0.0125.
  3. Starting tax year: enter the first year of the projection as a whole number from 1900 to 2200. This labels the first year; it does not choose that year’s local rate or assessment rules.
  4. Annual assessment change: enter the percentage change to apply after each year. Use 2 for a 2% annual increase, 0 for an unchanged value or −2 for a 2% annual decline. The accepted range is −100% to 100%. This changes the assessment, not the tax rate.
  5. Projection length: enter a whole number from 1 to 100 years. For five years beginning in 2026, the projection covers 2026 through 2030.
  6. Select Project property tax. Read the total with the first-year tax, first-year monthly equivalent, final assessed value and final-year tax. The chart shows estimated annual tax for each year.

The example numbers in empty fields are placeholders, not submitted values. Use the same starting tax year and projection length when comparing scenarios so the totals cover the same period.

Choose a rate that matches your value

An advertised effective tax rate may be calculated from a home’s market value rather than its taxable assessment. Applying it to a different base can misstate the estimate. If several taxing districts use the same taxable value, their percentage rates can be combined. If they use different exemptions or bases, calculate each part separately and add the results outside this tool.

Property Tax and Assessment Growth Formulas

Let V be the starting value in dollars, g the annual assessment change as a percentage, t the annual tax rate as a percentage, and N the projection length. The index i starts at 0 and ends at N − 1.

Project the assessment, then apply the rate

Assessmenti = V × (1 + g ÷ 100)i
Taxi = Assessmenti × t ÷ 100

The first year uses i = 0, so its assessment is exactly V. A five-year forecast applies four annual changes before the final year. Each year’s label is starting tax year + i. The rate t stays constant across the entire projection.

Add annual tax and calculate the monthly equivalent

Total projected tax = Tax0 + Tax1 + … + TaxN−1
First-year monthly equivalent = first-year tax ÷ 12

The calculator sums unrounded annual taxes and then rounds the total to cents. Individual annual values are also rounded to cents, so adding rounded figures can occasionally differ from the displayed total by a cent. The monthly equivalent divides the rounded first-year tax by 12; it is a budgeting figure, not a billing schedule.

Convert a mill rate to a percentage

Percentage rate = mill rate ÷ 10

One mill represents $1 per $1,000 of taxable value, equal to 0.1%. For example, 12.5 mills is 1.25%. The form accepts a percentage only; it does not have a millage selector.

Assessment Inputs and Tax Results Explained

Current assessed value
The dollar value to which the selected tax rate applies. Check whether your local bill uses assessed value or a lower taxable value.
Property tax rate
One annual percentage held constant for every year. Zero is accepted and produces zero tax.
Starting tax year
The first year label. It does not prorate a partial year or retrieve historical tax information.
Annual assessment change
The same compounded percentage increase or decrease each year after the first. Zero leaves the assessment unchanged.
Projection length
The number of annual estimates included, from 1 to 100. It includes the starting year.
Total projected property tax
The sum of annual estimates over the whole period, in dollars. It is not adjusted for inflation or discounted to today’s value.
First-year property tax and monthly equivalent
The initial annual estimate and that amount divided by 12. Neither includes insurance or mortgage payments.
Final projected assessed value
The starting value after N − 1 annual changes, rather than after N changes.
Final-year property tax and projection period
The last year’s estimated annual tax and the number of years included. The chart shows annual tax, not a running cumulative total.

Worked Example: A Five-Year Property Tax Projection

Enter a $300,000 Current assessed value, a 1.25% Property tax rate, 2026 as the Starting tax year, a 2% Annual assessment change and a Projection length of 5 years. These value, rate, change and length inputs match the form’s example placeholders.

Start with one year, then compound the assessment

For 2026, $300,000 × 1.25 ÷ 100 = $3,750. No growth is applied yet. For 2027, the assessment becomes $300,000 × 1.02 = $306,000, giving $306,000 × 0.0125 = $3,825. Repeat the 2% change for each later year while keeping the rate at 1.25%.

Illustrative assessment and annual tax, 2026 through 2030
YearProjected valueAnnual tax
2026$300,000.00$3,750.00
2027$306,000.00$3,825.00
2028$312,120.00$3,901.50
2029$318,362.40$3,979.53
2030$324,729.65$4,059.12

The unrounded final assessment is $300,000 × 1.024 = $324,729.648. Its tax is $4,059.1206. Summing all five unrounded annual taxes gives $19,515.1506, so the calculator reports $19,515.15 total projected property tax. The first-year monthly equivalent is $3,750 ÷ 12 = $312.50.

Compare an unchanged assessment

Change Annual assessment change to 0% and keep the other inputs. Each year’s tax stays at $3,750 and the five-year total becomes $18,750. The 2% growth scenario adds $765.15 over that period. This compares assumptions; it does not predict the assessor’s future decisions.

Using the Projection for Your Housing Budget

Use the monthly figure as a reserve estimate

The first-year monthly equivalent spreads the initial annual tax across 12 months. It does not mean your tax authority bills monthly, and it is not a lender’s escrow quote. If your lender collects tax with your mortgage payment, check the escrow statement before changing your budget. The later chart bars can help you see how much the annual amount changes under your chosen assumption.

Keep assessed, taxable and market value separate

Market value estimates what a property could sell for. Local assessment rules determine the value used for taxation, and exemptions may reduce the taxable portion. Those values can differ. Use the official record and the corresponding tax rate rather than assuming a purchase price is already the correct tax base.

This tool has no exemption, assessment-ratio or cap fields. Entering an already adjusted taxable value can help with a simple estimate, but a single growth percentage cannot reproduce exemptions that change over time or vary between taxing districts. Verify each district’s rules before combining rates.

Test assumptions without treating them as a forecast

Try an unchanged assessment, your preferred planning assumption and a higher-change scenario. The same percentage compounds every year, while actual reassessments can happen unevenly. A change in value does not necessarily translate into the same change in an actual bill because local rates and exemptions can also change. This calculator holds those factors fixed.

Check costs outside the model

Special assessments, flat service charges, penalties, discounts, credits, transfer-related reassessments and jurisdiction-specific rounding are not calculated. Nor does the total include mortgage interest, principal, insurance or homeowners association fees. There is no partial-year proration or federal income tax deduction calculation.

The period total simply adds future dollar amounts. It is not the amount you must invest today to fund those bills. Use your local assessor’s notice and tax collector’s bill to confirm the amount actually due, payment dates and any exemption requirements.

Common Property Tax Estimation Mistakes

  • Entering mills as a percentage. Convert first: 12.5 mills means 1.25%, not 12.5%.
  • Mixing market value with an assessment-based rate. Match the rate to the value used by the taxing authority.
  • Applying growth before the first year. The starting year uses the entered value without an increase or decrease.
  • Increasing the rate when you mean to increase the assessment. Annual assessment change affects the value; the Property tax rate stays fixed.
  • Counting too many increases. A five-year projection includes the initial year and four compounded changes.
  • Treating a monthly equivalent as an escrow bill. Divide-by-12 budgeting does not account for a lender’s escrow adjustments or the authority’s installment dates.
  • Assuming the total includes every charge. Compare the official bill for separate levies, fees, exemptions and credits.

Frequently Asked Questions

Where can I find my assessed value and property tax rate?

Check the latest assessment notice, the tax bill and the local assessor or tax collector’s official website. Confirm the tax year and whether the quoted rate applies to assessed value or taxable value after exemptions. This calculator does not retrieve those records.

Is assessed value the same as my home’s purchase price?

Not necessarily. Assessment rules and valuation dates can produce a different figure. A sale can also affect a later assessment under local rules. Use the value for the period you are estimating rather than assuming the seller’s bill will stay unchanged.

How do I enter a rate quoted in mills?

Divide the mill rate by 10 to obtain the percentage for the form. For example, 12.5 mills becomes 1.25%. One mill is $1 of tax per $1,000 of taxable value.

Does the annual assessment change apply in the first year?

No. The first year uses your starting value. Compounding starts in the following year, so a five-year projection applies four changes before the final year.

Can I project a decrease or an unchanged assessment?

Yes. Use a negative Annual assessment change for a decline, or 0% for no change. At −100%, the starting year still uses the entered value and all later projected values become zero. That is a mathematical scenario, not a local exemption rule.

Does this calculator include homestead exemptions or assessment caps?

It does not calculate them. An already adjusted starting taxable value can be used for a matching rate, but the model cannot reproduce changing exemptions, different district bases or a cap that resets after a sale.

Is the monthly equivalent what my lender will collect?

No. It is the first-year tax estimate divided by 12. A lender’s escrow calculation may also account for insurance, account balances and adjustments. Use the lender’s statement for the actual collection amount.

Can I change the tax rate from year to year?

There is one rate for the entire projection. You can rerun the calculation with another rate to compare scenarios, but it does not accept a different rate for each year.

Why can my official bill differ from this estimate?

Local authorities may use different taxable values for separate levies, revised rates, exemptions, caps, special assessments or different rounding. The projection does not calculate those rules or payment dates. Check the official bill before paying.

Sources & References

These government references explain assessment bases and rate units. They are examples of local tax administration, rather than rules automatically applied by this calculator.