Paradise Valley is one of the highest-net-worth ZIP codes in Arizona, and households here tend to hold a genuinely different mix of assets than the rest of the state: pre-tax retirement accounts, taxable brokerage holdings, real estate, business interests, and often significant concentrated stock positions built through a business sale, executive compensation, or a long professional career. The scale of the assets changes which planning questions actually matter.

At this asset level, the federal estate tax is a real, if narrower than it once was, consideration. The federal exemption is $15 million per person for 2026, made permanent by the 2025 tax law, meaning a married couple can generally shelter $30 million with portability. Many Paradise Valley households fall under this threshold today, but growth over a multi-decade retirement, combined with the exemption's scheduled path, makes periodic re-evaluation worthwhile rather than a one-time check.

The SECURE Act's 10-year rule is where Paradise Valley's typical estate size actually changes the Roth conversion math the most. A large traditional IRA left to adult children who are themselves in high-earning years creates a forced 10-year drawdown at their top marginal rate, often 32% or higher. Converting a meaningful share of that balance to Roth during the parent's lifetime, even paying tax at 32-35% today, frequently produces a better outcome across the family than leaving the balance pre-tax, once the math accounts for both generations rather than just the original owner.

Because most Paradise Valley households are already above the first IRMAA tier in ordinary retirement years, before any conversion, the usual 'avoid the IRMAA cliff' framing that applies to more moderate-asset households doesn't fully apply here. The real question becomes which of the higher IRMAA tiers the household is willing to accept, in which years, in exchange for a lower total household and family tax bill over time.

Charitable giving plays a larger structural role in Paradise Valley retirement plans than in most of the state. Donor-advised funds, private foundations, and Qualified Charitable Distributions after 70½ (up to $111,000 per person for 2026) all interact with the household's income, bracket, and estate plan simultaneously, and are frequently sized and timed around a specific high-income year, a business sale, a large conversion, a concentrated stock sale, rather than treated as a flat annual habit.

Concentrated stock and business interests require their own coordination with the retirement and tax plan. A large embedded gain in a single position or a closely held business interest affects both liquidity (how much can actually be spent without triggering a large capital gain) and the timing of other income events, since a business sale or major stock diversification in a given year will dominate that year's tax picture and should shape when conversions or major charitable gifts happen, not the other way around.

For surviving spouses in Paradise Valley specifically, the shift to single-filer status compresses brackets and IRMAA thresholds meaningfully at this asset level, often more dramatically in dollar terms than for a more moderate household, which makes proactive Roth conversion and beneficiary planning during the couple's joint-filing years especially valuable here.

Trust and estate document structure deserves the same level of attention as the investment and tax plan at this asset level. Arizona's community property rules affect how assets are titled and stepped up in basis at the first spouse's death, and a household with a business interest, multiple properties, or assets intended for specific heirs or charitable purposes typically needs a more customized trust structure than the simpler revocable living trust that serves most Arizona households well. Reviewing these documents alongside the tax and retirement plan, rather than treating estate documents as a one-time task completed years ago, is worth doing on a regular cycle as the estate grows.

If you have $5M or more in investable assets and adult children who are themselves high earners, model the multi-generational outcome of your traditional IRA balance under the SECURE Act's 10-year rule before assuming a conversion at 32-35% federal doesn't make sense, at this scale, it frequently does once your heirs' brackets are part of the calculation.

If you're charitably inclined, coordinate the timing of major gifts, donor-advised fund contributions, QCDs, with your highest-income years, a business sale, a large conversion, concentrated stock diversification, rather than treating charitable giving as a separate, flat annual decision.

• Rejecting Roth conversions because the current federal bracket, 32% or 35%, 'feels too high,' without running the multi-generational math against your heirs' expected brackets under the SECURE Act's 10-year rule.
• Treating retirement planning and estate planning as separate projects rather than one coordinated plan, at this asset level they are almost always the same decision.
• Funding charitable gifts from a taxable account instead of a QCD once past 70½, when the QCD accomplishes the same charitable goal while simultaneously reducing RMD income and AGI.
• Not periodically re-checking the household's position relative to the federal estate exemption as assets grow over a multi-decade retirement.
• Modeling a business sale, a concentrated stock diversification, or a large charitable gift in isolation rather than sequencing them together with the household's ongoing Roth conversion plan.