What Is an Ad Valorem Tax?

An ad valorem tax is a tax based on the assessed value of an item, such as real estate or personal property. The most common ad valorem taxes are property taxes levied on real estate. However, ad valorem taxes may also extend to a number of tax applications, such as import duty taxes on goods from abroad.

How Ad Valorem Tax Works

The Latin phrase ad valorem means “according to value.” All ad valorem taxes are levied based on the determined value of the item being taxed. In the most common application of ad valorem taxes, which are municipal property taxes, the real estate of property owners is periodically assessed by a public tax assessor to determine its current value. The assessed value of the property is used to compute a tax annually levied on the property owner by a municipality or other government entity.

Ad valorem taxes, which are based on ownership of a real asset, can be looked at in contrast to transactional taxes, such as sales taxes. While ad valorem taxes are determined and levied annually, transactional taxes are only levied at the time of a transaction.

How Ad Valorem Taxes Are Levied

Property ad valorem taxes are usually levied by a municipality but may also be levied by other local government entities, such as counties, school districts, or special taxing districts, also known as special purpose districts. Property owners may be subject to ad valorem taxes levied by more than one entity; for example, both a municipality and a county.

Ad valorem property taxes are typically a major, if not the major, revenue source for both state and municipal governments, and municipal property ad valorem taxes are commonly referred to as simply “property taxes.”

Determining Tax Values

Tax assessments for the purpose of determining ad valorem taxes are typically calculated as of January 1 each year. Ad valorem taxes represent a percentage of the assessed property value, which is commonly the property’s fair market value. Fair market value is the estimated sales price of the property, assuming a transaction between a willing buyer and a willing seller who both have reasonable knowledge of all pertinent facts about the property, and in a situation where neither party has a compulsion to complete the transaction. Fair market value can be more simply understood as just a reasonable price.

Property Subject to Ad Valorem Taxes

Ad valorem taxes are generally levied on both real property and personal property. Real property includes land, buildings and other structures, and any improvements to the property. An example of an improvement is a garage added to a single-family home or a road built on a parcel of land. Personal property ad valorem taxes are most commonly levied only on major personal property holdings, such as a car or boat. Incidental personal property, such as household appliances or clothing, is not usually subject to personal property taxes.

What Is Adjusted Gross Income (AGI)?

Adjusted gross income (AGI) is the figure that the Internal Revenue Service (IRS) uses to determine your income tax liability for the year. It is calculated by subtracting certain adjustments from gross income, such as business expenses, student loan interest payments, and other expenses. After calculating a taxpayer’s AGI, the next step is to subtract deductions to determine their taxable income.

The IRS also uses other income metrics, such as modified AGI (MAGI), for specific programs and retirement accounts.

Understanding Adjusted Gross Income (AGI)

As prescribed in the United States tax code, AGI is a modification of gross income. Gross income is simply the sum of all the money you earned in a year, which may include wages, dividends, capital gains, interest income, royalties, rental income, alimony, and retirement distributions, before tax or other deductions. AGI makes certain adjustments to your gross income to reach the figure on which your tax liability will be calculated.

Many U.S. states also use the AGI from federal returns to calculate how much individuals owe in state income taxes. States may modify this number further with state-specific deductions and credits.

Common Adjustments

The items subtracted from your gross income to calculate your AGI are referred to as adjustments to income, and you report them on Schedule 1 of your tax return when you file your annual tax return. Some of the most common adjustments are listed here, along with the separate tax forms on which a few of them are calculated:

• Alimony payments (for divorces filed before Jan. 1, 2019)
• Early withdrawal penalties on savings
• Educator expenses
• Employee business expenses for armed forces reservists, qualified performing artists, fee-basis state or local government officials, and employees with impairment-related work expenses (Form 2106)
• Health Savings Account (HSA) deductions (Form 8889)
• Moving expenses for members of the armed forces (Form 3903)
• Self-employed Simplified Employee Pension (SEP), Savings Incentive Match Plan for Employees of Small Employers (SIMPLE), and qualified plans
• Self-employed health insurance deduction
• Self-employment tax (the deductible portion)
• Student loan interest deduction

How to Calculate Adjusted Gross Income

If you use software to prepare your tax return, it will calculate your AGI once you input your numbers. If you calculate it yourself, you’ll begin by tallying your reported income for the year. That might include job income, as reported to the IRS by your employer on a W-2 form, plus other income, such as dividends and miscellaneous income, reported on 1099 forms.

Next, you add any taxable income from other sources, such as profit on the sale of a property, unemployment compensation, pensions, Social Security payments, or anything else that hasn’t already been reported to the IRS. Many of these income items are also listed on IRS Schedule 1.

The next step is to subtract the applicable adjustments to the income listed above from your reported income. The resulting figure is your AGI. To determine your taxable income, subtract either the standard deduction or your total itemized deductions from your AGI. In most cases, you can choose whichever gives you the most benefit.

For example, the standard deduction for tax returns for married couples filing jointly was $25,900 in 2022, rising to $27,700 in 2023, so couples whose itemized deductions exceed that amount would generally opt to itemize, while others would take the standard deduction.

The IRS provides a list of itemized deductions and the requirements for claiming them on its website. Your AGI also affects your eligibility for many of the deductions and credits available on your tax return. In general, the lower your AGI, the more significant the number of deductions and credits you will be eligible to claim, and the more you’ll be able to reduce your tax bill.

An Example of AGI Affecting Deductions

Let’s say you had some significant dental expenses during the year that weren’t reimbursed by insurance, and you’ve decided to itemize your deductions. You are allowed to deduct the portion of those expenses that exceed 7.5% of your AGI.

This means that if you report $12,000 in unreimbursed dental expenses and have an AGI of $100,000, you can deduct the amount that exceeds $7,500, which is $4,500. However, if your AGI is $50,000, the 7.5% reduction is just $3,750, and you’d be entitled to deduct a larger amount of that $12,000, in this case $8,250.

Adjusted Gross Income (AGI) vs. Modified Adjusted Gross Income (MAGI)

In addition to AGI, some tax calculations and government programs call for using what’s known as your modified adjusted gross income, or MAGI. This figure starts with your AGI, then adds back certain items, such as any deductions you take for student loan interest or tuition and fees.

Your MAGI is used to determine how much, if anything, you can contribute to a Roth individual retirement account (Roth IRA) in any given year. It is also used to calculate your income if you apply for Marketplace health insurance under the Affordable Care Act (ACA).

Many people with relatively uncomplicated financial lives find that their AGI and MAGI are the same number or very close.

Adjusted Gross Income vs. Gross Income vs. Taxable Income

Your gross income is all of the money you’ve earned in a year that isn’t exempt from taxation. This can be in the form of salary, wages, interest, dividends, capital gains, and so on.

Your adjusted gross income takes that amount and takes out certain qualified expenses and adjustments.

Taxpayers can then take either the standard deduction for their filing status or itemize the deductible expenses they paid during the year. You’re not permitted to both itemize deductions and claim the standard deduction. The result is your taxable income.

Frequently Asked Questions

The Bottom Line

Adjusted gross income, or AGI, is your gross income after it has been adjusted for certain qualified deductions that are permitted by the Internal Revenue Service (IRS). These qualified deductions reduce an individual’s gross income, thus reducing the taxable income that they will ultimately have to pay taxes on. You can save money come tax season by lowering your AGI, which will lower your taxable income, in turn. However, many of the adjustments allowed for AGI are specific for particular circumstances that may not apply to everyone.

What Is an Amended Return?

An amended return is a form filed in order to make corrections to a tax return from a previous year. An amended return can correct errors and claim a more advantageous tax status, such as a refund. For example, one might choose to file an amended return in instances of misreported earnings or tax credits. Mathematical errors, however, do not require amendments because the IRS automatically corrects for such errors when processing the tax return.

Who Should File an Amended Return?

All taxpayers are required to file their taxes annually for the previous tax year. Taxpayers may realize that they made a mistake in filling out their tax forms, or their circumstances may have changed after they have submitted or mailed a return that has been accepted by the government. If this occurs, the Internal Revenue Service (IRS) has provided a way for these individuals to redo their taxes by providing an amended return form, Form 1040-X, on the IRS website.

Not all errors need amending by the form. The IRS will spot and correct a mathematical error, for example, when the initial tax return is sent in for processing. When this happens, any refund owed will be adjusted and any extra tax liability due will be billed to the taxpayer. In the event that the individual fails to include a required form or schedule in their submitted original tax return, the IRS will send a letter requesting that they mail the missing information to one of their offices.

When to File an Amended Return

A taxpayer must file an amended return if:

• The taxpayer’s filing status for the tax year changed or was incorrectly entered. For example, if an individual filed as single but actually got married on the last day of the tax year, they will need to amend their return by filing their taxes under the appropriate status—married filing jointly (MFJ) or married filing separately (MFS).
• The number of dependents claimed is inaccurate. An amended return will be necessary if a taxpayer needs to claim additional dependents or remove dependents that were previously claimed. For example, a couple may have included a baby born in January before taxes were filed in April on the prior year’s tax return. That baby cannot be included on the previous year’s tax return because they were not born before the end of the year.
• Tax credits and deductions were claimed incorrectly or were not claimed. In the latter case, the taxpayer may have realized that they qualified for a credit or deduction and may want to file an amended return to reflect this.
• The income reported for the tax year was incorrect. If a taxpayer receives additional tax documents for the tax year (say a Form 1099 or a K-1 arrives in the mail after the tax deadline), they may file an amended tax return to report the additional income.
• Deductibility of certain expenses change as a result of legislation changes. Sometimes, legislation will come through after a taxpayer has filed a return that affects the deductibility of certain expenses. For example, the deduction for private mortgage insurance (PMI) originally expired on Dec. 31, 2017, due to the Tax Cuts and Jobs Act of 2017. The Consolidated Appropriations Act, signed into law in December 2019, extended the deduction through Dec. 31, 2020. This made the deduction available for the 2019 and 2020 tax years and retroactive for the 2018 tax year.
• Tax relief due to a natural disaster changes the taxpayer’s tax liability. This is a common issue for taxpayers who have been affected by a natural disaster, especially one in the later part of the tax year. The government frequently offers tax relief for those affected by natural disasters, but legislation may take longer to finalize than the typical tax season window allows. Taxpayers should pay their full tax liability as it sits when the tax return is due. If legislation changes, an amended return can be filed to reclaim any refund owed to them due to natural disaster tax relief.
• The taxpayer realizes that they owe more taxes than they actually paid. To avoid getting hit with a penalty from the government, they can file an amended return with the IRS.

How to Amend a Tax Return

Form 1040-X has three columns: A, B, and C. Under column A, the figure that was reported in the original or last-amended tax form is recorded. The taxpayer will need to input the adjusted or correct number in column C. The difference between columns A and C is reflected in column B. The adjustments made to a tax return will either result in a tax refund, balance due, or no tax change. The taxpayer also has to explain what changes they are making and the reasons for making each change in a section provided on the back of Form 1040-X.

Disadvantages of an Amended Tax Return

The drawback of filing an amended tax return is that Form 1040-X cannot be submitted electronically for every tax year, although the IRS has recently started accepting e-filed amended returns for tax year 2019. If filling out the form manually, the taxpayer has to mail the printed-out document to the IRS Service Center that processed the original tax form. The IRS manually processes amended returns, and the process can take 16 weeks—or even longer, if the amended return is not signed, is incomplete, has errors, requires additional information, needs clearance by the IRS bankruptcy department, has been routed to another specialized area, or has been affected by identity fraud.

There is, however, a three-year statute of limitations for issuing tax refund checks. Therefore, the taxpayer must file any amended returns that will result in a tax refund within three years after the date they filed the original tax return. An amended return filed to account for additional income or overstated deductions does not fall under any such statute and can be filed at any time.

Download Amended Tax Return Form Here

All current and prior revisions of the IRS Form 1040-X are available on the IRS website here.