What Is Modified Adjusted Gross Income (MAGI)?

If you have ever filled out a tax return, applied for health insurance through the marketplace, or looked into contributing to a Roth IRA, you have likely encountered the term modified adjusted gross income, or MAGI. It sounds like bureaucratic jargon, but it is one of the more consequential numbers in your financial life. Understanding what it is, how it is calculated, and why it matters can save you money and help you make smarter decisions about how you earn, save, and invest.

What Is Adjusted Gross Income?

Before getting to MAGI, you need to understand adjusted gross income, or AGI. Your AGI is your total gross income minus certain above-the-line deductions. Gross income includes wages, salaries, tips, freelance income, investment income, rental income, and other sources. Above-the-line deductions are subtractions the IRS allows you to take before you get to your standard or itemized deductions.

Common above-the-line deductions that reduce gross income to AGI include contributions to a traditional IRA, student loan interest, alimony paid under pre-2019 divorce agreements, contributions to a health savings account (HSA), and self-employment taxes.

Your AGI is the number found on line 11 of Form 1040. It is the foundation for many other calculations on your return.

How MAGI Is Different

Modified adjusted gross income takes your AGI and adds certain deductions back in. The purpose is to get a cleaner picture of your actual economic income for specific eligibility calculations. The IRS does not want people who have deducted certain expenses to qualify for additional tax benefits they would not otherwise qualify for without those deductions.

The specific add-backs that convert AGI to MAGI depend on the context. Different programs use slightly different MAGI definitions, which is part of what makes this concept confusing. That said, common items added back to AGI to arrive at MAGI include:

Student loan interest deduction, IRA deductions, tuition and fees deductions, passive income or loss, rental losses, excluded foreign earned income, tax-exempt interest income, and certain Social Security benefits.

For most people with straightforward financial situations, MAGI and AGI are the same number or very close to it.

Why MAGI Matters: Where It Is Used

The reason MAGI gets so much attention is that it determines eligibility for a surprising number of programs and tax benefits. Here are the most important ones.

Roth IRA Contributions

This is where MAGI comes up most often for people who are investing for retirement. The IRS uses your MAGI to determine whether you can contribute to a Roth IRA, and if so, how much. For 2024, the ability to contribute to a Roth IRA phases out for single filers with a MAGI between $146,000 and $161,000. For married couples filing jointly, the phase-out range is $230,000 to $240,000. Above those limits, direct Roth IRA contributions are not allowed.

If your MAGI exceeds these thresholds, you are not completely locked out of a Roth IRA. A strategy called the backdoor Roth IRA allows higher earners to make a non-deductible traditional IRA contribution and then convert it to a Roth, subject to certain rules and potential tax implications.

Traditional IRA Deductibility

If you or your spouse are covered by a workplace retirement plan like a 401(k), your MAGI determines whether your traditional IRA contributions are tax-deductible. For 2024, the deduction phases out for single filers covered by a workplace plan with a MAGI between $77,000 and $87,000, and for married couples filing jointly where the contributing spouse is covered, between $123,000 and $143,000.

If neither you nor your spouse participates in a workplace retirement plan, your traditional IRA contributions are fully deductible regardless of income.

Affordable Care Act Premium Tax Credits

If you purchase health insurance through the federal marketplace or a state exchange, your MAGI determines whether you qualify for premium tax credits, which reduce the monthly cost of your insurance. Eligibility is based on your MAGI relative to the federal poverty level. This is one area where even modest differences in income can have a meaningful impact on what you pay for health coverage each month.

Medicare Premiums (IRMAA)

For people enrolled in Medicare, MAGI from two years prior is used to determine whether you pay a higher premium for Medicare Part B and Part D. This surcharge is called the Income-Related Monthly Adjustment Amount, or IRMAA. In 2024, higher-income Medicare beneficiaries can pay significantly more per month than the base premium. This is a planning consideration worth thinking about as you approach retirement age.

Child Tax Credit and Other Credits

Your MAGI also affects eligibility for the child tax credit, the American Opportunity Tax Credit for college expenses, the Lifetime Learning Credit, and the premium tax credit, among others. Each has its own thresholds and phase-out ranges.

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How to Calculate Your MAGI

The exact calculation varies by purpose, but the general process is the same. Start with your AGI from line 11 of Form 1040. Then add back specific deductions or exclusions relevant to the benefit or program you are calculating for. The IRS and your tax software will typically walk you through this, but knowing the concept helps you anticipate where you stand before you sit down to file.

If you use tax preparation software, it typically calculates your MAGI automatically in the context of each relevant form or credit. If you work with a tax professional, this is a number worth asking about directly, especially if you are close to a threshold that affects your Roth IRA eligibility or healthcare credits.

MAGI and Financial Planning

Because MAGI affects so many important thresholds, it is a useful number to monitor throughout the year, not just at tax time. If you are approaching a phase-out range for Roth IRA contributions or a tax credit you rely on, you may have options to reduce your MAGI before year-end.

Strategies that can lower MAGI include maximizing contributions to tax-deferred accounts like a 401(k) or 403(b), contributing to an HSA if you have a high-deductible health plan, harvesting capital losses to offset gains, and timing the receipt of income or deductions when possible.

Books on money and personal finance often emphasize the importance of understanding how the tax code interacts with your investing decisions. The Millionaire Next Door by Thomas Stanley and William Danko, Your Money or Your Life by Vicki Robin and Joe Dominguez, and The Simple Path to Wealth by JL Collins all touch on how tax-efficient behavior compounds over a lifetime of investing. Understanding your MAGI is a practical extension of that mindset.

When to Talk to a Professional

If your income is near a phase-out threshold, or if you have multiple income sources, investment accounts, and deductions, calculating your MAGI and understanding its implications can get complicated quickly. A fee-only financial advisor or a CPA can help you model different scenarios and make sure you are not inadvertently triggering a higher Medicare premium or losing eligibility for a tax credit through a single financial decision made without context.

That said, the concept itself is not out of reach for anyone willing to spend a little time learning it. Your MAGI is a number you can understand, monitor, and in many cases, influence. That puts you in a better position to make smart decisions with your money all year long.

What is the State and Local Tax (SALT) Deduction?

If you’ve ever paid property taxes, state income taxes, or sales taxes, you may have wondered whether any of that money comes back to you at tax time. The answer, for some people, is yes — through something called the SALT deduction. It’s a federal tax provision that has been at the center of political debate for years, and it recently underwent major changes. Here’s what it is, how it works, and whether it’s likely to affect you.

The Basics: What SALT Stands For

SALT stands for state and local taxes. The SALT deduction allows taxpayers who itemize their federal tax return to subtract certain state and local taxes they’ve paid from their federally taxable income. This lowers the amount of income subject to federal tax, which can reduce what you owe the IRS.

The taxes that qualify include state and local income taxes, real estate property taxes, and personal property taxes. Taxpayers who live in states without an income tax — like Florida or Texas — can choose to deduct state and local sales taxes instead, but the IRS requires you to pick one or the other. You cannot deduct both income taxes and sales taxes.

Why It Exists

The SALT deduction has roots going back to the earliest days of the federal income tax in the early 20th century. The original logic was straightforward: if a portion of your income is already taken by state and local governments, you shouldn’t have to pay federal tax on that same money. It was an attempt to avoid double taxation.

States and local governments use these tax revenues to fund schools, roads, emergency services, and other public infrastructure. The federal deduction was historically viewed as a way to support those systems indirectly, by making it less painful for residents to pay into them.

How It Works in Practice

To claim the SALT deduction, you must itemize your deductions on Schedule A of your federal tax return rather than taking the standard deduction. This is an important threshold, because itemizing only makes sense when your total deductible expenses — including SALT, mortgage interest, charitable contributions, and others — add up to more than the standard deduction for your filing status.

For 2025, the standard deduction is $15,750 for single filers and $31,500 for married couples filing jointly. If your itemized deductions don’t clearly exceed those numbers, the standard deduction is likely the better choice.

The dollar savings from SALT depend on your marginal tax bracket. If you’re in the 24% bracket and you can deduct $20,000 in state and local taxes, that deduction saves you roughly $4,800 in federal taxes.

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The $10,000 Cap: What Happened in 2018

Before 2018, there was no limit on how much you could deduct under SALT. High earners in high-tax states sometimes claimed deductions of $30,000 or more. That changed with the Tax Cuts and Jobs Act (TCJA), signed into law in December 2017. The TCJA imposed a $10,000 annual cap on SALT deductions ($5,000 for married individuals filing separately), effective for tax years 2018 through 2024.

The cap hit residents of high-tax states — particularly California, New York, New Jersey, and Connecticut — hardest. Homeowners in those states often pay $15,000 or more in property taxes alone, before accounting for state income taxes. The $10,000 limit meant they were leaving significant deductions on the table.

The TCJA also nearly doubled the standard deduction at the same time, which caused the share of Americans who itemized to fall sharply — from about 31% of filers in 2017 to roughly 9% in the years following.

The 2025 Change: The Cap Jumps to $40,000

The SALT deduction landscape changed again in 2025. President Trump signed the One Big Beautiful Bill Act into law on July 4, 2025, which raised the SALT deduction cap from $10,000 to $40,000 for most filers ($20,000 for married filing separately) for tax years 2025 through 2029. The cap increases by 1% each year during that period — so it becomes $40,400 in 2026, and so on through 2029. Starting in 2030, the cap is set to revert to $10,000 unless Congress passes new legislation.

This is a significant expansion. For someone paying $25,000 in state income taxes and $15,000 in property taxes, the old $10,000 cap meant losing $30,000 worth of deductions entirely. Under the new rules, that same filer can deduct the full $40,000.

Who Benefits and Who Doesn’t

The SALT deduction has never been equally distributed. Before the TCJA, 91% of the benefit was claimed by households earning more than $100,000, concentrated in a handful of states: California, New York, New Jersey, Illinois, Texas, and Pennsylvania. The expanded cap doesn’t change that basic dynamic.

The new $40,000 cap comes with an income-based phaseout. For tax year 2025, the full deduction is available to filers with a modified adjusted gross income (MAGI) of $500,000 or less. Above that threshold, the cap is reduced by 30 cents for every dollar of income over $500,000. The deduction never falls below $10,000, regardless of income. Taxpayers with a MAGI above $600,000 effectively face the same $10,000 limit as before.

That phaseout creates an odd situation for filers earning between $500,000 and $600,000: their effective tax rate on that income can spike sharply, a phenomenon some tax professionals have dubbed the “SALT torpedo.”

What the SALT Debate Is Really About

SALT has been politically contentious because it doesn’t benefit everyone equally. Residents of lower-tax states — many in the South and Midwest — get little or nothing from it. Critics argue that the deduction, in effect, lets residents of high-tax states offset some of their local tax burden at everyone else’s expense. Supporters counter that without it, residents of states with robust public services face a form of double taxation.

The 2017 cap was defended partly on fiscal grounds — limiting it raised federal revenue to offset tax cuts elsewhere in the law. The 2025 expansion, by contrast, is expected to reduce federal revenues substantially.

What This Means for Your Taxes

If you own a home, pay significant state income taxes, and live in a higher-tax state, it’s worth revisiting whether itemizing makes sense for your 2025 return. The higher cap makes itemizing a viable option for more people than it has been since 2017.

A few practical considerations: you can only deduct SALT in the year you actually paid the taxes, not when they were assessed. Some taxpayers prepay property taxes or accelerate estimated state tax payments before December 31 to maximize their deduction in a given year. And as always, the decision to itemize versus take the standard deduction should be based on your total picture — not just SALT.

If your tax situation involves significant property and state income taxes and you’re unsure whether to itemize, consulting a tax professional or financial advisor is a reasonable step. The changes introduced in 2025 are meaningful enough that the math may look different than it has for the past several years.

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