The number that decides whether you can fund a Roth IRA is not your salary, your savings, or your discipline.
It's a modified adjusted gross income figure the IRS adjusts most years, and it catches plenty of people off guard right around tax time.
For 2025, single filers phase out of direct Roth contributions between $150,000 and $165,000 of MAGI.
Married couples filing jointly phase out between $236,000 and $246,000.
Earn one dollar past the top of your range and a direct contribution is off the table entirely.
Here's the part that trips people up: MAGI is not the number on your W-2.
It can include bonuses, side gig income, taxable investment gains, and certain deductions added back.
A raise, a strong bonus year, or a profitable side hustle can quietly push you over the line without any change to your spending.
So what happens if you contribute and then discover you exceeded the limit?
The IRS treats the excess as an overcontribution.
Left uncorrected, it can trigger a 6 percent excise tax for each year it stays in the account.
The fix is to remove the excess plus any earnings before your tax filing deadline, or apply it to a later year if you're still eligible.
There's a legal workaround that many high earners use: the backdoor Roth.
You make a nondeductible traditional IRA contribution, then convert it to a Roth.
The catch is the pro-rata rule, which taxes the conversion based on the ratio of pre-tax to after-tax money across all your traditional IRAs.
If you already hold a large rollover IRA, the math gets messy fast.
The limits exist because Roth accounts offer tax-free growth and tax-free withdrawals in retirement, funded by after-tax dollars.
Congress wanted the benefit targeted, not unlimited, so it tied eligibility to income.
That means the rule can change with new legislation, and it has several times.
Contribution limits for 2025 are $7,000 under age 50 and $8,000 if you're 50 or older, separate from the income phase-out.
If you're near the threshold, waiting until you file your return to contribute can prevent a costly mistake.
And if you're married filing separately, the phase-out range is extremely narrow, so check the current rules before assuming you qualify.
If this all sounds like a lot of math for a retirement account, that's because it is.
But knowing your MAGI before you contribute beats finding out from a letter.
Our take: the income limits aren't a wall, they're a checkpoint.
Most people who get burned simply never checked the number until it was too late.
Final Thoughts
Ten minutes with last year's return and a calculator can save you a penalty and a headache.