Two Medicare late enrollment penalties are described the same way in almost every summary: sign up late, pay more for life. They are built on different units. The Part D drug penalty counts single months and multiplies them by a premium figure that the Centers for Medicare & Medicaid Services resets every year. The Part B medical penalty counts only completed twelve-month periods and multiplies them by a much larger premium. For 2026 the two base figures are $38.99 and $202.90. What follows is what each formula does with the same gap, and why one of them costs a different amount every January while the gap behind it does not change. What Starts the Part D Count The condition is not lateness in general. The Medicare drug coverage cost page states: “You may owe a late enrollment penalty if at any time after your Initial Enrollment Period is over, there’s a period of 63 or more days in a row when you don’t have Medicare drug coverage or other creditable prescriptio...
One ceiling, two tax clocks
For the 2026 tax year the IRS set the combined annual ceiling on traditional and Roth IRA contributions at $7,500, raised from $7,000 for 2025, with an additional catch-up of $1,100 for anyone who reaches age 50 by the end of the year, for a total of $8,600. Those figures were published in IRS Notice 2025-67 and repeated in the IRS news release announcing 2026 retirement plan limits.
The word combined is what gets misread. The $7,500 is not a per-account allowance but a single ceiling both account types draw from: a filer who puts $5,000 into a traditional IRA for 2026 has $2,500 of room left, not another $7,500. A separate compensation test also applies, so a person with $4,000 of wages is capped at $4,000 regardless of the statutory limit.
The ceiling is also independent of a workplace plan. The 2026 elective deferral limit for 401(k), 403(b) and governmental 457 plans is $24,500, with an $8,000 catch-up at 50 and $11,250 for those who turn 60 through 63 during the year under SECURE 2.0. Deferring the full $24,500 at work does not consume any of the $7,500. It changes something else entirely, as the next section shows.
Everything else about the traditional-versus-Roth question reduces to four thresholds: two income tests on the contribution side, two clock-and-age tests on the withdrawal side.
Threshold 1: whether the traditional deduction survives the income test
A traditional IRA contribution is not automatically deductible. It turns on one preliminary question: is the filer, or the filer's spouse, covered by a retirement plan at work during the year. If nobody in the household is covered, the deduction is allowed in full at any income level and the table below does not apply at all. Where coverage exists, the IRS sets these modified adjusted gross income ranges for 2026:
| Situation in 2026 | Phase-out range (MAGI) |
|---|---|
| Single or head of household, covered at work | $81,000 to $91,000 |
| Married filing jointly, the contributor is covered at work | $129,000 to $149,000 |
| Married filing jointly, only the spouse is covered | $242,000 to $252,000 |
| Married filing separately, covered at work | $0 to $10,000 |
Below the bottom figure the deduction is whole. Above the top it is gone, though the contribution remains legal and becomes basis reported on Form 8606. Between the two it shrinks proportionally.
Worked example: a single filer at $86,000
Take a single filer covered by a 401(k) with 2026 MAGI of $86,000, exactly halfway through the $81,000 to $91,000 band. The calculation in IRS Publication 590-A works from the top down: $91,000 minus $86,000 is $5,000, divided by the $10,000 band gives 0.5, and 0.5 of $7,500 is $3,750. The result is rounded to the nearest $10, and any positive result below $200 is treated as $200.
So $3,750 of a full contribution is deductible and $3,750 is not. At $86,000 a single filer is in the 22% bracket, which begins above $50,400, making that deduction worth roughly $825 of federal tax. The undeducted half is where the comparison turns: an undeducted traditional dollar and a Roth dollar cost the same today, but only one has tax attached on the way out.
Threshold 2: whether Roth contributions are permitted at all
The Roth side has no deduction to lose, so its income test governs eligibility itself. For 2026 the IRS set these phase-out ranges:
| Filing status in 2026 | Phase-out range (MAGI) |
|---|---|
| Single or head of household | $153,000 to $168,000 |
| Married filing jointly | $242,000 to $252,000 |
| Married filing separately | $0 to $10,000 |
The Roth band for single filers spans $15,000 while the traditional deduction band spans $10,000, and the joint Roth range is identical to the traditional range that applies when only the non-contributing spouse is covered at work. Both are written against the same statutory figure.
Worked example: a married couple at $247,000
A couple filing jointly with 2026 MAGI of $247,000, both covered at work, lands in two places at once. The traditional deduction range for a covered contributor tops out at $149,000, so nothing is deductible. The Roth range runs $242,000 to $252,000, and $247,000 is halfway through, so each spouse's Roth ceiling is $3,750.
The remaining $3,750 per spouse does not vanish. It can go into a traditional IRA as a nondeductible contribution reported on Form 8606, creating basis that is not taxed again on the way out. The couple's two workplace plans keep their own $24,500 of deferral room, untouched by any of this.
Worked example: a single filer at $200,000 with no workplace plan
This case inverts the usual assumption. At $200,000 of MAGI the Roth door is shut, since the single range ends at $168,000. But with no plan at work the deduction phase-out never engages and the full $7,500 is deductible — worth roughly $1,800 in the 24% bracket, which runs to $201,775 for single filers in 2026. The high earner told that the Roth is the better account is here the one who cannot use it.
What the shared ceiling has done over five years
Under SECURE 2.0 the $1,000 IRA catch-up became subject to cost-of-living adjustment, and 2026 produced the first increase, to $1,100.
Two features matter more than the direction. IRS Publication 590-A shows the base limit at $6,000 for 2019 through 2022, so plans assuming steady annual increases drifted out of date. And the gap between the bars widened only in 2026 — a spreadsheet built before that change understates the age-50 ceiling by $100 a year.
Threshold 3: the two clocks that govern a tax-free Roth withdrawal
On the withdrawal side the two accounts stop resembling each other. A traditional IRA distribution of deductible contributions and earnings is taxed as ordinary income whenever it happens. A Roth distribution is tax free only if it is a qualified distribution, and IRS Publication 590-B defines that with two conditions that must both hold.
- Five taxable years must have passed since the first contribution to any Roth IRA the owner holds, not since the particular account was opened.
- The distribution must also meet one of four triggers: the owner has reached age 59½, the owner is disabled, the distribution is made to a beneficiary after the owner's death, or it is used for a first-time home purchase subject to a $10,000 lifetime limit.
The clocks run independently. A 62-year-old who opened a first Roth two years ago meets the age trigger and fails the five-year test. A 40-year-old with a fifteen-year-old Roth meets the holding period and fails every trigger. Neither has a qualified distribution.
The ordering rule softens this. Publication 590-B has Roth distributions come out in a fixed sequence: regular contributions first, then conversions, then earnings. Because contributions were made with after-tax dollars, the contributed amount comes back out without tax or penalty regardless of age or holding period. Tax questions begin only past that layer.
That 10% additional tax under IRS Topic no. 557 applies to distributions before age 59½ from both account types, on top of ordinary income tax, and it carries a long exception list: qualified higher education expenses, disability or terminal illness, substantially equal periodic payments, an IRS levy, up to $10,000 for a first-time home purchase, up to $5,000 for a qualified birth or adoption, an economic loss from a federally declared disaster, and, for distributions made after December 31, 2023, domestic abuse and personal emergency distributions. Form 5329 reports the tax or claims an exception the Form 1099-R coding does not already capture.
Threshold 4: the required minimum distribution date
The fourth divergence has nothing to do with income. Under the IRS required minimum distribution FAQs, withdrawals from a traditional IRA generally must begin at age 73, the first due by April 1 of the following year. A Roth IRA carries no such requirement for the original owner: the IRS states that withdrawals from Roth IRAs and designated Roth accounts are not required until after the owner's death. Beneficiaries have rules of their own.
This is a structural difference, not a rate difference. A traditional IRA becomes taxable income on a schedule the account holder does not set, and that forced income interacts with other thresholds in the return. A Roth balance can sit untouched indefinitely. For a household expecting to leave part of the balance alone, that distinction holds regardless of bracket.
Where the Saver's Credit changes the arithmetic
At lower incomes a third instrument enters that is often left out of the comparison. The Retirement Savings Contributions Credit, claimed on Form 8880, pays 50%, 20% or 10% of up to $2,000 of contributions, or $4,000 for a joint return, producing a maximum credit of $1,000 or $2,000. IRS Notice 2025-67 sets the 2026 AGI ceilings for each tier:
| Credit rate | Married filing jointly | Head of household | All other filers |
|---|---|---|---|
| 50% | up to $48,500 | up to $36,375 | up to $24,250 |
| 20% | up to $52,500 | up to $39,375 | up to $26,250 |
| 10% | up to $80,500 | up to $60,375 | up to $40,250 |
The credit applies to either account type, so it favors neither. What it does is compress the value of the traditional deduction. A single filer with AGI of $24,000 who contributes $2,000 sits in the 50% tier, and the tier arithmetic points to a $1,000 credit. That filer's tax before credits is small: the 2026 standard deduction for a single filer is $16,100, leaving about $7,900 of taxable income, entirely inside the 10% bracket that runs to $12,400, for roughly $790 of tax. How much of the credit can be used depends on that figure. The deduction from the same $2,000 at a 10% marginal rate is worth about $200. When the deduction is worth that little, the argument for deferring tax rather than paying it now rests on much thinner ground than at 24% or 32%.
The IRS also excludes anyone under 18, anyone claimed as a dependent on another return, and any student enrolled full time during part of five calendar months of the tax year.
Four things the comparison is frequently made to say that it does not
- That an income limit blocks Roth money entirely. The phase-out applies to Roth contributions. Publication 590-A describes conversions from a traditional IRA to a Roth IRA without an income restriction. The tax consequence of a conversion is a separate question, and the aggregation rule below governs it.
- That a nondeductible traditional contribution converts cleanly. Form 8606 figures the taxable portion by treating all traditional, SEP and SIMPLE IRAs as a single account. A filer holding a large pre-tax rollover balance cannot convert only the nondeductible slice; the pro rata calculation follows the whole aggregate.
- That a non-working spouse cannot have an IRA. Under the Kay Bailey Hutchison spousal IRA provision, a married couple filing jointly can fund an IRA for the spouse with little or no compensation, subject to the couple's combined compensation and the annual per-person limit.
- That the contribution deadline follows a filing extension. Publication 590-A ties the deadline to the due date of the return not including extensions. An October filing date does not move the IRA window. Contributing past the limit triggers a 6% tax on the excess for each year it remains in the account.
Numbers to Re-check
| Figure | As used in this article | Where to verify | When it changes |
|---|---|---|---|
| IRA contribution limit | $7,500 for tax year 2026 | IRS, "Retirement topics – IRA contribution limits" | Announced each autumn for the following year |
| IRA catch-up, age 50+ | $1,100, for a total of $8,600 | IRS COLA table, section 219(b)(5)(A) | Indexed annually under SECURE 2.0 |
| Traditional deduction phase-out | $81,000–$91,000 single; $129,000–$149,000 joint | IRS Notice 2025-67; Publication 590-A | Annually with the retirement plan limits release |
| Roth contribution phase-out | $153,000–$168,000 single; $242,000–$252,000 joint | IRS Notice 2025-67; Publication 590-A | Annually with the retirement plan limits release |
| 401(k) elective deferral | $24,500; $8,000 catch-up; $11,250 at ages 60–63 | IRS Notice 2025-67 | Annually |
| Saver's Credit AGI tiers | 50% to $24,250 single, $48,500 joint | IRS Form 8880 instructions; Notice 2025-67 | Annually |
| Standard deduction | $16,100 single; $32,200 joint; $24,150 head of household | IRS Revenue Procedure 2025-32 | Annually |
| Marginal bracket edges | 22% above $50,400 single; 24% above $105,700 single | IRS Revenue Procedure 2025-32 | Annually |
| RMD beginning age | 73, first payment by April 1 of the following year | IRS required minimum distribution FAQs | Changes only by statute |
Where This Doesn't Apply
Several conditions flip the conclusions above rather than adjusting them.
- No workplace retirement plan in the household. The traditional deduction phase-out ranges apply only when the filer or the filer's spouse is covered by a plan at work. Without coverage, the deduction is available at any income, which means the single filer at $200,000 in the third example gets the full deduction and no Roth access at all. Every conclusion drawn from the phase-out tables is void in this case.
- Married filing separately. Both phase-out ranges collapse to $0 to $10,000. Practically no separate filer who is covered at work gets a traditional deduction, and practically none can make a full Roth contribution. Filing status here matters more than income.
- Compensation below the limit. The $7,500 ceiling is capped by taxable compensation. A retiree with only investment income, or a worker with $3,000 of wages, is held to that lower figure and the tables never engage.
- A large pre-tax IRA balance. The Form 8606 aggregation rule makes the nondeductible path above produce a mostly taxable conversion for anyone holding a rolled-over 401(k) in a traditional IRA. The balance, not the income figure, drives it.
- State income tax. Every number here is federal. States that exempt wage or retirement income change the value of a contribution-year deduction relative to a tax-free withdrawal later.
- An unknown future rate. The whole trade compares a known current marginal rate to an unknown later one. Where the later rate cannot be estimated, the durable differences are structural: the age-73 requirement on one side, the ordering rule on the other.
- Inherited accounts. Nothing above describes beneficiary rules, which the IRS sets separately for inherited IRAs of both types.
Concrete framework
- Establish whether anyone in the household is covered by a workplace plan for the year. This decides whether the traditional phase-out table applies at all.
- Compute modified adjusted gross income and locate it against both 2026 tables. The result is one of four states: both accounts fully available, traditional partially deductible, Roth partially available, or neither test passed in full.
- Check AGI against the Saver's Credit ceilings. In the lowest tiers the credit is worth more than the deduction it sits beside.
- Confirm taxable compensation. The contribution cannot exceed it, whatever the tables permit.
- Before any nondeductible contribution, total every traditional, SEP and SIMPLE IRA balance, because Form 8606 treats them as one.
- Re-check each figure against the source listed before acting.
This article explains how the rules are written. It is not tax, legal, or insurance advice, and it does not account for any individual situation. Amounts and thresholds change; verify the current figures at the source listed above before acting.
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