When AGI Crosses a Saver's Credit Tier Line, the Credit Drops by $600

A single filer whose 2026 adjusted gross income lands on $24,250, and who put $2,000 into an IRA during the year, is looking at a credit of $1,000. A single filer one dollar higher, at $24,251, who put in the same $2,000, is looking at $400. The contribution did not change. The rate that multiplies it fell from 50 percent to 20 percent, because that rate is not interpolated across an income range. It is read off a table, and the table has edges.

The provision is the retirement savings contributions credit under Internal Revenue Code section 25B, printed on Form 8880 under the heading Credit for Qualified Retirement Savings Contributions and known in most filing software as the saver's credit. Its 2026 edges were published by the Internal Revenue Service in Notice 2025-67, 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living. Three numbers per filing status do all the work. Every dollar figure below is a 2026 figure unless it is labeled otherwise.

Three Numbers Decide the Rate

Section 25B assigns an applicable percentage of 50, 20, 10, or zero by comparing adjusted gross income against three limitations. Notice 2025-67 states each one as an increase over the 2025 amount. For a joint return, the notice reads:

• 25B(b)(1)(A) — "The adjusted gross income limitation under section 25B(b)(1)(A) for determining the retirement savings contributions credit for married taxpayers filing a joint return is increased from $47,500 to $48,500"
• 25B(b)(1)(B) — "the limitation under section 25B(b)(1)(B) is increased from $51,000 to $52,500"
• 25B(b)(1)(C) and 25B(b)(1)(D) — "the limitation under sections 25B(b)(1)(C) and 25B(b)(1)(D) is increased from $79,000 to $80,500"

The first limitation is the ceiling of the 50 percent rate, the second the ceiling of the 20 percent rate, the third the ceiling of the 10 percent rate. Above the third, the rate is zero and no credit is allowed. That mapping can be checked against a second primary document rather than taken on trust. The 2025 Form 8880 prints $79,000 as the joint adjusted gross income above which the credit disappears, and that is precisely the 2025 figure the notice says was raised to $80,500. The same check holds for the other statuses: the form prints $59,250 for a head of household and $39,500 for a single filer, and the notice reports those two as rising to $60,375 and $40,250.

IRS Topic no. 610 describes the span without the statutory citations: "The amount of the Retirement Savings Contributions Credit you can get can be as low as 10% or as high as 50% (the credit rate)". The published rate tables treat every ceiling as inclusive: on the IRS saver's credit page, whose rate table currently displays 2024 amounts, each 50 percent row carries an adjusted gross income "not more than" figure, and the 20 percent row opens exactly one dollar above it.

Where the 2026 Lines Fall

Written out as bands, with each ceiling included in the band below it:

• Married filing jointly — 50 percent through $48,500; 20 percent from $48,501 through $52,500; 10 percent from $52,501 through $80,500; no credit above $80,500.
• Head of household — 50 percent through $36,375; 20 percent from $36,376 through $39,375; 10 percent from $39,376 through $60,375; no credit above $60,375.
• All other taxpayers — 50 percent through $24,250; 20 percent from $24,251 through $26,250; 10 percent from $26,251 through $40,250; no credit above $40,250.

A Tier Line Is a Cliff, Not a Slope

The rate by itself produces no dollar figure. It multiplies a contribution that has already been capped. The IRS states that cap directly: "The maximum contribution amount that may qualify for the credit is $2,000 ($4,000 if married filing jointly)", "making the maximum credit $1,000 ($2,000 if married filing jointly)." A taxpayer who contributes $6,000 and a taxpayer who contributes $2,000 arrive at the same line on the form, because Form 8880 line 6 instructs the filer to "In each column, enter the smaller of line 5 or $2,000".

Multiply the capped $2,000 by each rate and the staircase becomes a dollar staircase.

For a single filer at the cap, the credit falls from $1,000 to $400 at the first line, from $400 to $200 at the second, and from $200 to zero at the third. The first step is the expensive one: $600 of credit turns on one dollar of adjusted gross income. On a joint return the same three steps are worth $1,200, $400 and $400, because the capped contribution there is $4,000 rather than $2,000.

This separates section 25B from most income-tested provisions in the Code. A phase-out trims a benefit gradually as income rises, so one extra dollar costs a few cents. The 2026 IRA deduction, for instance, is computed down in $10 steps across the phase-out range. Section 25B has no such range. It has three edges, and a dollar that crosses one costs hundreds.

The Joint Schedule Is Two Single Schedules

The three filing statuses are not set independently. Every head of household ceiling is exactly three quarters of the joint ceiling, and every all-other ceiling is exactly half of it. Checking all three tiers: $36,375 is three quarters of $48,500, $39,375 is three quarters of $52,500, and $60,375 is three quarters of $80,500. Likewise $24,250, $26,250 and $40,250 are one half of $48,500, $52,500 and $80,500.

That ratio propagates into the widths of the bands. The 20 percent band spans $4,000 on a joint return, $3,000 for a head of household and $2,000 for everyone else. The 10 percent band spans $28,000, $21,000 and $14,000. The whole distance from the top of the 50 percent rate to the point where the credit vanishes is $32,000, $24,000 and $16,000. Each set stands in the same 4 to 3 to 2 relationship.

Because the joint ceilings are exactly double the single ceilings and the contribution cap is exactly double, the joint schedule reproduces two single schedules stacked together. Two unmarried people with $24,000 of adjusted gross income each, contributing $2,000 each, reach 50 percent separately, for a maximum credit of $1,000 each before the line 11 tax liability limitation. A married couple with $48,000 of combined adjusted gross income, contributing $2,000 each, reaches 50 percent once, for a maximum of $2,000 on the same basis. The tier structure itself imposes no penalty on the joint return.

The asymmetry sits somewhere else, in the words "In each column" on line 6. Form 8880 gives each spouse a column, and each column is capped at $2,000 on its own. A couple in which one spouse contributes $4,000 and the other contributes nothing has $2,000 counted, not $4,000. The $4,000 figure is available only when both spouses have qualifying contributions of their own.

From Contribution to Credit, in the Order the Form Takes Them

The Testing Period Subtraction

Between the contributions and the cap sits a subtraction that catches filers who moved money in both directions. The IRS puts it this way on its saver's credit page: "your eligible contributions may be reduced by any recent distributions you received from a retirement plan or IRA, or from an ABLE account."

What counts as recent is defined by the form rather than left to judgment. Line 4 of the 2025 Form 8880 reaches back well beyond the tax year, asking for "Certain distributions received after 2022 and before the due date (including extensions) of your 2025 tax return". That window opens two years before the tax year and stays open past year end, to the extended due date. A distribution taken in 2023 still reduces a contribution claimed for 2025. Filers who contributed and withdrew in the same period can find line 5 at or near zero, and line 7 stops them there: "If zero, stop; you can't take this credit".

The Tax Liability Ceiling

The second ceiling arrives after the rate has been applied. Line 10 multiplies the capped contributions by the decimal rate, and line 11 carries a tax liability limitation from a worksheet. Line 12 then reads: "Credit for qualified retirement savings contributions. Enter the smaller of line 10 or line 11 here and on Schedule 3 (Form 1040), line 4".

Where the credit lands settles its character. On the 2025 Schedule 3 (Form 1040), line 4 reads "Retirement savings contributions credit. Attach Form 8880", and it sits in Part I, headed "Nonrefundable Credits". A taxpayer whose tax before credits is $250 cannot collect a $1,000 saver's credit. Line 11 cuts it to $250, and the remaining $750 is not paid out and not carried forward. The 50 percent rate belongs to the lowest income bands, which is also where tax liability is smallest, so the two ceilings frequently bind on the same return.

What the Cost-of-Living Adjustment Moved

Notice 2025-67 raised all nine limitations, but not by the same proportion, and the pattern is visible only by subtracting. On a joint return the 50 percent ceiling rose $1,000, from $47,500 to $48,500, while the 20 percent and 10 percent ceilings each rose $1,500. For a head of household the three increases were $750, $1,125 and $1,125; for everyone else, $500, $750 and $750. The same three-quarters and one-half ratios hold in the increases as in the levels.

The consequence is that the bands changed shape. Because the 20 percent ceiling rose $500 more than the 50 percent ceiling on a joint return, the 20 percent band widened from $3,500 in 2025 to $4,000 in 2026. The 10 percent band, whose two edges rose by the same $1,500, held its width at exactly $28,000. The single-filer figures move the same way: a 20 percent band widening from $1,750 to $2,000, and a 10 percent band steady at $14,000.

The same notice sets the 2026 section 402(g) elective deferral limit at $24,500 and the 2026 IRA contribution limit at $7,500, plus a $1,100 catch-up at age 50 and over. The $2,000 that fills the saver's credit cap is under a tenth of the deferral limit. Both traditional and Roth contributions can qualify, though only the pre-tax varieties reduce adjusted gross income itself, the figure the tier lines are measured against. That distinction runs alongside the two separate Roth five-year clocks.

The Last Year of This Credit

Section 25B is scheduled to be superseded. The IRS states on its Saver's Match page that "The Saver's Match is replacing the Saver's Credit for contributions made to retirement plans or IRAs", and that "Starting in 2027, the federal government will match up to 50% of money you save for retirement." The 2026 tax year is therefore the last one for which the tier table above governs.

The replacement is built differently in two respects that matter to the arithmetic here. First, the IRS page describes the match as deposited into a retirement plan or IRA rather than applied against tax, which removes the tax liability limitation that caps line 12 of Form 8880. Second, the ranges the page lists for 2027 include a partial-match band rather than a cliff: for a joint return, a full 50 percent match up to $41,000 of modified adjusted gross income, a partial match from $41,001 to $70,999, and none at $71,000 and over. The head of household figures are $30,750 and $53,250, and the single figures $20,500 and $35,500.

The geometry carries over even as the mechanism changes. Those 2027 phase-out ranges span $30,000, $22,500 and $15,000 for joint, head of household and single filers respectively, which is the same 4 to 3 to 2 proportion that governs the 2026 bands.

Numbers to Re-check

• The nine section 25B limitations. Every 2026 figure above comes from Notice 2025-67. They are adjusted annually, so a return for any other year needs that year's notice.
• The form for the right year. The line numbers, the $2,000 cap language and the testing-period window quoted here are from the 2025 Form 8880, the most recent one published. The 2026 form governs a 2026 return, and its testing-period window will name different years.
• The testing-period window. It extends to the due date of the return including extensions, so a distribution taken after year end but before filing can still reduce the contribution counted.
• The tax liability limitation. The credit is capped by the worksheet figure on line 11, so a change in tax before credits changes the credit itself.
• The 2027 Saver's Match figures. The modified adjusted gross income ranges cited are those the IRS lists for 2027 and describe a program that has not yet applied to a filed return.
• Filing status. Moving between joint, head of household and all-other status moves all three ceilings at once, by a quarter or a half.

Where This Doesn't Apply

• Taxpayers the statute excludes outright. The IRS lists the eligibility conditions as "Age 18 or older, Not claimed as a dependent on another person's return, and Not a student." Topic no. 610 repeats it: "Dependents and full-time students are also not eligible for the credit." A full-time student with $1,000 of tax and a $2,000 contribution is outside the provision regardless of adjusted gross income.
• Returns with no tax to offset. Because the credit sits in Part I of Schedule 3 under "Nonrefundable Credits", it cannot generate a refund on its own. The tier table is irrelevant where line 11 is zero.
• Contributions the form does not count. The 2025 Form 8880 line 1 names "Traditional and Roth IRA contributions, and ABLE account contributions by the designated beneficiary for 2025". An ABLE contribution made by someone other than the designated beneficiary is not counted on that line.
• Anything above the 10 percent ceiling. Above $80,500, $60,375 or $40,250 the applicable percentage is zero, and the size of the contribution no longer changes the result.
• Tax years after 2026. Per the IRS, the Saver's Match replaces this credit starting in 2027, with a different formula, a different delivery mechanism and different income ranges.
• State income tax. Section 25B is a federal provision. Any state treatment of retirement contributions is set separately and is not governed by these thresholds.

This article explains published federal rules and is not tax, legal, or investment advice. It describes how the Internal Revenue Service has defined the section 25B thresholds and the order of operations on Form 8880; it does not evaluate any individual's return. Whether a particular contribution qualifies, how the testing period applies to a given distribution history, and how the tax liability limitation interacts with other credits depend on facts not addressed here. Anyone applying these figures to a real return should consult a qualified tax professional or work from the current IRS forms and instructions. For a related look at how a different federal threshold interacts with adjusted gross income, see how the $6,000 senior deduction sits outside the provisional income test.