401(k) & Roth IRA Calculator (2026 IRS Limits): Pre-Tax vs. Roth Arbitrage for High-Tax States
Project your retirement nest egg under the 2026 IRS 401(k) contribution limits ($23,500 standard, $31,000 age 50+, $34,750 ages 60–63 SECURE 2.0 super catch-up) and compare Traditional vs. Roth for NY/NJ earners.
By Pablo Cirre Gómez and East Corp Capital Quantitative Desk
NEW YORK — Sit down at a kitchen table anywhere from Manhattan and Westchester to Bergen County, Fairfield County, or Back Bay Boston, and one financial question quickly dominates the conversation around 401(k) & roth ira calculator (2026 irs limits): How do the 2026 statutory rules, interest rates, and regional tax brackets actually translate into real dollars for your household or business? For 2026, the IRS elective deferral limit for 401(k), 403(b), and 457 plans is $23,500, with a $7,500 catch-up for ages 50+ ($31,000 total) and a special SECURE 2.0 ‘Super Catch-Up’ of $11,250 for ages 60–63 ($34,750 total).
401(k) & Roth IRA Compound Growth & Catch-Up Simulator (2026)
Projects tax-deferred and Roth compounding with 2026 IRS elective deferral limits ($23,500 standard, $31,000 age 50+, and $34,750 age 60–63 Super Catch-Up).
How Does Geographic Tax Arbitrage: Why NYC Earners Should Rarely Choose Roth 401(k) Impact Your Bottom Line?
Standard financial blogs often repeat a simplistic rule: ‘Choose a Roth 401(k) if you want tax-free withdrawals in retirement.’ For professionals living and working in New York City, New Jersey, or Massachusetts during their peak earning years, that advice ignores state and local tax mechanics.
When you contribute $23,500 to a Roth 401(k) while living in Manhattan at a $300,000 salary, you pay 35% Federal + 6.85% NYS + 3.876% NYC = 45.73% marginal tax on those dollars today. Conversely, if you contribute pre-tax to a Traditional 401(k) and invest the $10,746 annual tax savings in a taxable brokerage account, even if you stay in New York State during retirement, NYS exempts the first $20,000 of annual pension/IRA distributions after age 59½—and if you retire to Pennsylvania, Florida, or New Hampshire, your state tax rate on 401(k) withdrawals drops to 0.00%.
| Account / Limit Type | Under Age 50 Limit | Age 50–59 & 64+ Catch-Up | Ages 60–63 Super Catch-Up | Total Defined Contribution Cap (415c) |
|---|---|---|---|---|
| 401(k) / 403(b) / 457 Elective Deferral | $23,500 | $31,000 (+$7,500) | $34,750 (+$11,250) | $70,000 (excl. catch-up) |
| Traditional / Roth IRA | $7,000 | $8,000 (+$1,000) | $8,000 (+$1,000) | N/A |
| SEP IRA / Solo 401(k) Total | $70,000 | $77,500 | $81,250 | $70,000 base |
| SIMPLE IRA | $16,500 | $20,000 (+$3,500) | $21,750 (+$5,250) | N/A |
Let’s Run the Numbers in Dollars: Comparing 401(k) / 403(b) / 457 Elective Deferral vs. SEP IRA / Solo 401(k) Total in the Tri-State Corridor
Let’s run the numbers in dollars using verified 2026 benchmarks from our quantitative table above so you can see the exact gap before making a decision:
- Baseline Profile (Account / Limit Type: 401(k) / 403(b) / 457 Elective Deferral): Produces a verified outcome of $70,000 (excl. catch-up) (Total Defined Contribution Cap (415c)), reflecting $23,500 and $31,000 (+$7,500).
- Scaled Tri-State Profile (Account / Limit Type: SEP IRA / Solo 401(k) Total): Shifts the net figure to $70,000 base (Total Defined Contribution Cap (415c)). High earners working in New York City or New Jersey who plan to retire to a lower-tax state (such as Florida, Pennsylvania, or New Hampshire) capture a massive ‘Geographic Tax Arbitrage’ by choosing Traditional Pre-Tax 401(k) contributions.
How Does Avoiding the Form 8606 Pro-Rata Trap on Backdoor Roth IRAs Impact Your Bottom Line?
For Wall Street and tech employees whose Modified Adjusted Gross Income (MAGI) exceeds the direct Roth IRA ceiling, the Backdoor Roth IRA remains fully statutory. However, under IRC § 408(d)(2), the IRS aggregates all of your Traditional, Rollover, SEP, and SIMPLE IRAs as of December 31 of the conversion year. Before executing a Backdoor Roth conversion, roll any old pre-tax Rollover IRA balances into your current employer’s active 401(k) plan to isolate the non-deductible basis at zero pre-tax balance.
To model how this interacts with the rest of your East Coast balance sheet, run your numbers in our NYC & NY State Paycheck Tax Calculator, compare housing and closing tax rules in our NYC Mansion Tax & Closing Cost Calculator, and benchmark after-tax fixed-income yields in our US Treasury Bills vs. Bank CDs Calculator.
Frequently Asked Questions
Does New Jersey allow a state tax deduction for Traditional 401(k) contributions?
Yes, New Jersey allows employees to exclude elective deferrals to a 401(k) Plan from NJ gross wages. However, New Jersey does NOT allow exclusions for 403(b), 457, or Traditional IRA contributions on the NJ-1040, creating a record-keeping basis adjustment for NJ residents.
What is the SECURE 2.0 Super Catch-Up for ages 60 to 63?
Starting in 2025/2026 under the SECURE 2.0 Act, workers who attain age 60, 61, 62, or 63 by the end of the calendar year can contribute a higher catch-up amount of $11,250 (instead of $7,500), bringing their maximum 401(k) employee deferral to $34,750.