Guides › Updated 2026-10-31
How to Calculate Property Tax With Mills on the Real Estate Exam
TL;DR: Tax = assessed value / 1,000 x mills. Assessed value = market value x assessment ratio (minus any exemption). One mill = $1 per $1,000. A rate in mills divided by 10 gives a percent. If the question gives a market value and a ratio, do the ratio first.
What a mill is
A mill is a tax rate expressed per $1,000 of assessed value: 1 mill = $1 / $1,000 = 0.001. So 28 mills is 0.028, or 2.8%. Counties and districts add mill rates together (county + school + city), and the question may give you one combined rate or several to add.
The formulas
| Goal | Formula |
|---|---|
| Assessed value | Market value x Assessment ratio |
| Taxable value | Assessed value - Exemptions |
| Tax | Taxable value / 1,000 x Mills |
| Mill rate | Tax needed / Total taxable value x 1,000 |
| Tax per $100 to mills | Multiply the dollars per $100 by 10 |
Example 1: Market value, ratio and mills
A home has a market value of $320,000. The county assesses at 40% of market value and the rate is 35 mills.
- Assessed value: $320,000 x 0.40 = $128,000
- Tax: $128,000 / 1,000 x 35 = 128 x 35 = $4,480
Per month, an escrow account would collect $4,480 / 12 = $373.33. The effective rate on market value is $4,480 / $320,000 = 1.4%, which is lower than the 3.5% nominal mill rate because only 40% of the value is taxed.
Example 2: Tax per $100
A property is assessed at $200,000, and the rate is $2.40 per $100 of assessed value.
$200,000 / 100 = 2,000; 2,000 x $2.40 = $4,800
Converted to mills: $2.40 per $100 = $24 per $1,000 = 24 mills. Check: $200,000 / 1,000 x 24 = $4,800.
Example 3: Homestead exemption
A home is assessed at $150,000. The owner qualifies for a $25,000 exemption, and the rate is 42 mills.
- Taxable value: $150,000 - $25,000 = $125,000
- Tax: $125,000 / 1,000 x 42 = 125 x 42 = $5,250
Exemptions come off the assessed value before the rate is applied. Whether an exemption exists, and how big it is, depends on the jurisdiction, so use the number the question gives you.
Example 4: Finding the mill rate
A school district needs $2,400,000 from property taxes. The total taxable value in the district is $60,000,000.
$2,400,000 / $60,000,000 = 0.04, and 0.04 x 1,000 = 40 mills
Check: $60,000,000 / 1,000 x 40 = 60,000 x 40 = $2,400,000.
Example 5: Working backward to value
A tax bill is $3,780 at 30 mills. The assessment ratio is 70%. Find the assessed value, then the market value.
- Assessed value: $3,780 / 0.030 = $126,000
- Market value: $126,000 / 0.70 = $180,000
Check: $180,000 x 0.70 = $126,000; $126,000 / 1,000 x 30 = $3,780. The key move is dividing by the rate (0.030), not multiplying.
Where mills fit with prorations
Property taxes also appear in closing problems. Once you have the annual bill, split it between buyer and seller with the daily-rate method in our prorations guide. Taxes and insurance also feed monthly housing payments (PITI), covered in the formulas cheat sheet.
Shortcut table
| If you see | Do this |
|---|---|
| “Mills” | Divide assessed value by 1,000, multiply by mills |
| “Per $100” | Divide assessed value by 100, multiply by the rate |
| “Assessed at 50% of market” | Multiply market value by 0.50 first |
| “Exemption” | Subtract from assessed value before the rate |
| “What was the market value?” | Work backward: divide by the rate, then by the ratio |
Common mistakes
- Applying mills to market value instead of assessed value.
- Treating 35 mills as 35%. It is 3.5%.
- Dividing by 100 instead of 1,000.
- Skipping the exemption, or applying it after the rate.
- Multiplying when working backward.
Practice
Mill problems are short, which makes them points you can win quickly. Take the free quiz for your state, such as Texas, Florida, California or New York, or use the GablePrep app for step-by-step solutions. All our math formulas are collected at /real-estate-math-formulas/.
GablePrep is an independent study resource, not affiliated with any state real estate commission or testing provider. We are not a pre-licensing course and this is not legal advice. Property tax rules differ by state and locality; confirm what your exam covers in your state’s handbook.
Frequently asked questions
What is a mill in property tax?
A mill is one-tenth of one cent, or $1 of tax for every $1,000 of assessed value. A rate of 28 mills means $28 per $1,000 of assessed value, which is 2.8%.
Is the mill rate applied to market value or assessed value?
To assessed value. If a question gives a market value and an assessment ratio, first multiply market value by the ratio to get the assessed value, then apply the mills.
How do you convert mills to a percentage?
Divide by 1,000 and multiply by 100, which means divide mills by 10. So 35 mills is 3.5%, and 24 mills is $2.40 per $100.
Do assessment ratios and exemptions work the same in every state?
No. Assessment ratios, exemptions and how rates are set differ by state and locality. On the exam, use the numbers given in the question, and check your state's handbook for what local tax content is tested.
Independent exam prep. Not affiliated with any state real estate commission or testing provider. Not an approved pre-licensing course. Not legal advice. Facts verified on 2026-10-31; always confirm with your state’s official handbook.