Roth Conversion Strategy for NJ Pre-Retirees: The Window You Cannot Afford to Miss

If you are between the ages of 60 and 72 and have meaningful assets in traditional IRAs or 401(k)s, you are sitting inside one of the most valuable tax planning windows of your financial life. For New Jersey residents, this window carries an additional dimension that makes it even more powerful — and more worth protecting.

This article explains why, covers NJ-specific tax treatment, and walks through a case study of what strategic partial conversions can look like in practice.

For a complete picture of how Roth conversions fit into NJ retirement income planning, see: Complete Guide to Retirement Income Planning in NJ.

Why Ages 60–72 Are the Highest-Value Years for Tax Planning

Before age 60, you are likely still working, which means your income is at or near its peak. After age 72 (or 73, depending on your birth year), required minimum distributions (RMDs) from your traditional IRAs begin, and the government dictates the size of your withdrawals.

The window between those two points — when you have stopped working but RMDs have not yet begun — is when you have the most control over your taxable income. That control is the raw material of Roth conversion planning.

During this window, you can:

Convert traditional IRA funds to Roth at strategically chosen income levels
Fill up lower federal tax brackets before RMDs push you into higher ones
Reduce future RMDs by shrinking your traditional IRA balance now
Manage NJ income to stay within pension exclusion thresholds

New Jersey's Two-Layer Roth Advantage

Most articles on Roth conversions treat federal and state tax as if they move in lockstep. For New Jersey residents, they don't — and the gap between the two creates real planning value.

Layer One: Your NJ Cost Basis Often Converts Tax-Free

New Jersey has never allowed a deduction for contributions to a traditional IRA. If you contributed to a traditional IRA or 401(k) while living in New Jersey, there's a good chance a meaningful portion of that account is after-tax NJ basis — money the state already taxed once, before it ever went into the account.

According to the NJ Division of Taxation, any amount you convert from a traditional IRA to a Roth is includable in New Jersey income only "to the extent it was not previously taxed by New Jersey." In practice, that means the portion of a conversion attributable to your NJ cost basis passes through to your NJ return tax-free, even though the entire conversion amount is fully taxable on your federal return.

This is not a technicality. For pre-retirees who have been contributing to retirement accounts as NJ residents for decades, this basis can be substantial, and many CPAs and taxpayers miss it because it requires tracking NJ-specific basis on Worksheet D and the NJ-1040 pension and IRA worksheets, separate from federal cost basis on Form 8606. If you've never tracked NJ basis on prior IRA withdrawals, this is worth revisiting with your advisor before your next conversion — it directly reduces the NJ tax cost of converting.

Layer Two: Qualified Roth Distributions Don't Count Against Your Pension Exclusion

Once your Roth has cleared the five-year holding period and you're past 59½, distributions are excludable from NJ income entirely — the NJ Division of Taxation confirms qualified distributions "should not be reported anywhere on the New Jersey tax return." A qualified distribution is one made after the five-year holding period and after age 59½.

That matters beyond the distribution itself. Because qualified Roth income is excluded from NJ gross income, it also doesn't count toward the income test that determines your pension exclusion (the $100,000 / $125,000 / $150,000 thresholds discussed below). A retiree drawing $40,000 a year from a Roth can do so without moving a dollar closer to losing their pension exclusion on other income — something a traditional IRA withdrawal of the same size cannot do.

Together, these two mechanics mean the Roth conversion decision for a New Jersey resident isn't just a federal tax-rate arbitrage. It's a chance to convert a slice of every dollar tax-free today (your NJ basis) while building an account that stays invisible to NJ's income-based thresholds for the rest of your life. For high-net-worth NJ retirees, the Roth account becomes a tax-free reservoir that can be tapped without consequences — no NJ income tax, no pension exclusion impact, and (if managed carefully) no IRMAA exposure.

Federal vs. NJ Tax Impact of Conversions

Understanding both tax dimensions is essential to planning conversions correctly.

Federal side: Conversions are taxed at ordinary income rates. Under current law, the federal brackets for 2025 top out at 37% for income above $626,350 (single) or $751,600 (married filing jointly). For most NJ pre-retirees in the 60–72 window, conversions landing in the 22%–24% federal bracket represent a favorable rate relative to what future RMDs might face.

NJ side: New Jersey's top marginal rate is 10.75% for income over $1 million. For income between $75,000 and $500,000 (single filers) — or $150,000 and $500,000 for married filing jointly — the NJ rate is 6.37%. Conversions in the pre-RMD window at this rate may be very favorable compared to a future environment where RMDs add to income.

Why Today's Rates Still Matter

For several years, this section of a Roth conversion article would have flagged the scheduled expiration of the 2017 Tax Cuts and Jobs Act individual rate cuts at the end of 2025. That risk has since been resolved: the One Big Beautiful Bill Act, signed into law in 2025, made the current federal brackets — including the 22% and 24% brackets most pre-retirees convert into — permanent starting in 2026.

That removes one source of urgency, but not the underlying case for converting during the pre-RMD window. Today's brackets are historically favorable by any longer lens: the 22% and 24% brackets sit well below the 28% and 33% brackets that applied to comparable income levels before 2018, and history shows individual tax law is rarely static for more than a decade at a time. Converting today locks in known rates on a known amount of income. Waiting until RMDs begin trades that certainty for an unknown future rate environment, applied to a mandatory withdrawal you no longer control the size or timing of.

In other words, the case for using the 60–72 window isn't about beating a legislative deadline anymore — it's about converting at a rate you can see and control, rather than one dictated later by the tax code and the size of your account.

Case Study: A Married Couple Converting $50,000/Year Over Five Years

Consider a married couple in their early 60s. Both have retired. They have $1.2 million in traditional IRA assets and $200,000 in taxable brokerage accounts. Their combined pension income is $65,000 per year. Social Security has not yet begun.

Current NJ income: $65,000 — well within the $100,000 threshold for the full pension exclusion.

They decide to convert $50,000 per year to a Roth IRA over five years.

NJ income during conversion years: $65,000 + $50,000 = $115,000. This falls in the $100,001–$125,000 phase-out band, meaning they receive 50% of the pension exclusion (up to $50,000 of their $65,000 pension). They pay NJ tax on $15,000 of pension income plus the $50,000 conversion — total of $65,000 at their blended NJ rate.
After five years: They have converted $250,000 to a Roth. Their traditional IRA is reduced to roughly $950,000 (pre-growth). Future RMDs will be proportionally smaller.
When RMDs begin: Instead of RMDs pushing them to $130,000+ in income, they are drawing from a mix of taxable accounts and the Roth. They can manage NJ income more precisely.
Long-term: Roth distributions are NJ-tax-free and do not affect pension exclusion eligibility.

The trade-off is paying tax during the conversion window. The benefit is purchasing decades of tax-free Roth growth and greater control over NJ income thresholds in later retirement.

Partial Conversions to Stay Under NJ Thresholds

The goal is not to convert as much as possible — it is to convert optimally. For NJ residents, the key checkpoints are:

Stay under $100,000: Full pension exclusion applies; ideal if pension income is low
$100,001–$125,000: 50% pension exclusion for joint filers; still meaningful, but factor in the tax cost
$125,001–$150,000: Only 25% pension exclusion for joint filers; evaluate carefully
Above $150,000: Zero pension exclusion; conversions here carry a higher NJ tax cost

Working with a financial planner to identify the right conversion amount each year — based on your specific income picture — is what turns a good idea into a precisely executed strategy.

IRMAA Considerations

If you are already on Medicare or will be within two years, be aware that Roth conversion income raises your MAGI and can trigger IRMAA surcharges on Medicare Part B and Part D premiums. The 2025 IRMAA threshold begins at $106,000 for single filers and $212,000 for married couples. Because IRMAA is based on your tax return from two years prior, a conversion today will not affect your premiums until two years from now — which gives you a window to plan around it, but also means the impact of a conversion made late in the pre-RMD window may land after RMDs have already begun.

Coordinating conversion amounts to stay below IRMAA thresholds is an important refinement — especially for retirees whose income otherwise sits near the boundary.

Mega-Backdoor Roth for Business Owners

If you are a New Jersey business owner with a solo 401(k) or a small business plan that allows after-tax contributions, the mega-backdoor Roth strategy may allow you to move significantly more money into a Roth account each year, depending on plan design and current IRS contribution limits. This accelerates Roth accumulation while you are still earning income and can be combined with the pre-RMD conversion window for maximum impact.

Act During the Window — Not After It

The pre-RMD window is finite. Once RMDs begin, your income floor rises, your flexibility narrows, and the cost of conversions increases. The time to plan is before those constraints arrive.

Manley Capital Management works with New Jersey pre-retirees to design Roth conversion strategies that account for NJ's unique tax rules, pension exclusion thresholds, IRMAA exposure, and long-term estate planning goals. Contact us to explore your conversion window.