If you are a high-earner living in Westchester County, you are likely no stranger to the “success tax.” Between federal brackets, New York State’s progressive income tax, and local property levies, a significant portion of every dollar you earn above the median is spoken for before it ever hits your brokerage account. For years, the 401(k) catch-up contribution was one of the few remaining levers you could pull to lower your taxable income once you crossed the age-50 threshold.

That lever is being recalibrated. Under a provision of the SECURE 2.0 Act—often referred to as the “Roth Mandate”—any participant whose FICA wages exceeded $145,000 in the previous year will soon be required to make their 401(k) catch-up contributions on a Roth basis. In plain English: the IRS is tired of waiting for your tax dollars. They want them now, at your highest career earnings peak, rather than later in retirement.

For a family in Scarsdale or Chappaqua pulling in $400,000+, this isn’t just a clerical change; it is a direct hit to your current cash flow and a mandatory forfeit of tax-deferred growth potential. However, there is a strategic workaround that sophisticated planners are increasingly utilizing: The Fixed Indexed Annuity (FIA) as a “Shadow Traditional IRA.”

Understanding the Roth Mandate: Section 603

The mechanics of Section 603 are straightforward but punitive for high earners. If you earn more than $145,000 (a threshold that will be indexed for inflation), you can no longer deduct your catch-up contributions from your current year’s taxes. While the IRS recently provided a “grace period” or administrative transition period until 2026, the law remains on the books. The shift from “Traditional” (pre-tax) to “Roth” (after-tax) means that for every $7,500 catch-up contribution you make, you could be losing upwards of $3,000 in immediate tax savings when state and federal rates are combined.

The frustration for many of my clients isn’t the Roth account itself—Roth IRAs are excellent tools—it’s the mandate. It removes the element of choice. It forces you to pay taxes today at a 35% or 37% bracket, rather than deferring that tax until retirement when you might be in a lower bracket or living in a more tax-friendly state like Florida or North Carolina.

The FIA Solution: The “Shadow Traditional IRA”

When the 401(k) rules become restrictive, we have to look outside the employer-sponsored plan to find similar tax characteristics. This is where the Fixed Indexed Annuity (FIA) enters the conversation. While often misunderstood as a simple retirement income product, an FIA functions remarkably well as a tax-deferral vehicle for high-net-worth individuals who have “maxed out” their traditional options.

An FIA allows you to contribute post-tax dollars (like a non-deductible IRA) but offers tax-deferred growth on the earnings. However, unlike a Traditional IRA, there are no IRS-imposed contribution limits on an FIA. If you want to move $50,000 or $500,000 into a tax-deferred environment to offset the loss of your 401(k) deduction, you can.

How the “Shadow IRA” Strategy Works

In this strategy, the FIA acts as a secondary bucket. Since your 401(k) catch-up is now forced into a Roth (where you pay taxes upfront), you compensate by moving other liquid capital into an FIA. The growth within the FIA is not taxed annually. Unlike a standard brokerage account where you are hit with capital gains taxes and 1099s on dividends every year, the FIA allows your entire principal to compound untouched by the IRS until you choose to take distributions.

The Evidence: Why This Outperforms Taxable Brokerage Accounts

Many high earners argue that they can just put that extra money into a low-cost S&P 500 index fund in a taxable brokerage account. While that offers liquidity, it lacks the two primary advantages of an FIA in a high-tax environment: tax-deferred compounding and downside protection.

1. The Tax-Drag Calculation: In a taxable account, even if you don’t sell, you are likely paying taxes on dividends and capital gains distributions. Over a 15-year horizon, this “tax drag” can reduce your ending balance by 15% to 20%. In an FIA, that money stays in the contract, earning interest on the money that would have otherwise gone to the government.

2. The Floor of Zero: Westchester professionals who lived through 2008 and 2022 know that sequence-of-returns risk is the greatest threat to a retirement plan. FIAs provide a “floor”—meaning if the market index they are linked to drops by 20%, your account balance remains at 0% for that year. You don’t lose principal. In exchange for this protection, you typically have a “cap” or a “participation rate” on the gains. For the conservative portion of a portfolio—the part that used to be held in bonds—this is a mathematically superior profile in a volatile interest rate environment.

A Practical Example: The Scarsdale Executive

Consider a 55-year-old executive earning $350,000. Under the new mandate, her $7,500 catch-up contribution is now Roth. She pays approximately $2,700 in additional taxes today because of that change. To combat this, she takes $50,000 of “lazy cash” sitting in a high-yield savings account (where she is paying 37% tax on the interest every year) and moves it into an FIA linked to the S&P 500 with a 10% cap.

If the market goes up 12%, she gets 10%. If the market drops 20%, she keeps her $50,000. Most importantly, she pays zero taxes on those gains until she retires at 65. By the time she reaches retirement, the compounded tax savings within the FIA have more than offset the “lost” deduction from her 401(k) catch-up.

Is This Strategy Right for You?

While the “Shadow IRA” strategy is powerful, it is not a one-size-fits-all solution. As a senior writer in this space for a decade, I always emphasize that annuities are insurance products, not direct investments. They come with trade-offs, most notably liquidity. Most FIAs have “surrender charges” if you withdraw more than 10% of the value in the first few years. Therefore, this strategy is only for “long-term money”—the portion of your wealth intended for age 60 and beyond.

Furthermore, the choice of index and the strength of the insurance carrier matter immensely. You aren’t just buying a tax shelter; you are buying a contract. You need a carrier with an A+ rating and a history of maintaining fair “caps” and “participation rates” for their policyholders.

Actionable Steps to Take Today

If your FICA wages are north of $145,000, the clock is ticking on your ability to plan for the Roth mandate. Here is how to audit your current position:

1. Review Your Prior Year W-2

Check Box 3 (Social Security wages). If that number is over $145,000, the Roth mandate applies to you. Don’t wait for your HR department to tell you; they are often the last to implement these changes smoothly.

2. Quantify the “Tax Hit”

Calculate your marginal tax rate (Federal + State). Multiply your total catch-up contribution ($7,500 for 2024) by that rate. This is the “new tax” you are paying. This is the number we need to “recover” through other tax-advantaged strategies.