Are You Saving Too Much in Your Retirement Accounts?

It’s possible to save too much in tax-deferred retirement accounts. The problem isn’t the total amount saved. It’s the concentration in one type of account. A household with $5 Million in traditional IRAs faces required minimum distributions that can push them into the top tax brackets, trigger maximum IRMAA Medicare surcharges, and create significant tax exposure for heirs. Diversifying across taxable, tax-deferred, and tax-free (Roth) accounts often produces better lifetime outcomes than maximizing tax-deferred contributions alone. The right balance
depends on current income, expected retirement income, and estate planning goals.

Key Takeaways:

– Saving too much in any single account type creates concentration risk, not investment risk.

– A $5 Million traditional IRA produces RMDs of roughly $189,000 per year at age 73 and grows from there.

– Roth contributions and conversions create tax diversification that protects against future tax rate increases.

– HSAs provide a triple tax advantage that often beats both traditional and Roth retirement accounts for medical expenses.

– The 2026 maximum 401(k) contribution is $24,500 for under 50 and $32,500 for 50-plus, per the IRS.

Can you save too much for retirement?

In terms of total assets, no. More savings means more options.

In terms of concentration in one account type, yes. A retiree with $5 Million all in traditional IRAs has a worse tax position than a retiree with $5 Million split across traditional, Roth, and taxable accounts.

The problem is rarely “too much saved.” The problem is usually “too much saved in the wrong type of account.”

What is tax diversification?

Tax diversification means spreading retirement savings across three tax treatment categories:

1. Tax-deferred. Traditional IRA, 401(k), 403(b). Money goes in pre-tax, grows tax-deferred, comes out fully taxable.

2. Tax-free. Roth IRA, Roth 401(k), HSA (for medical). Money goes in after-tax, grows tax-free, comes out tax-free.

3. Taxable. Brokerage accounts, savings, CDs. Money goes in after-tax, income taxed annually, capital gains at preferential rates.

The combination gives flexibility in retirement to manage taxes, IRMAA, and surviving spouse exposure year by year. See Link For Blog 12 for the withdrawal order discussion.

Why is too much in a traditional IRA a problem?

Three reasons.

1. RMDs. A $5 Million traditional IRA produces a first-year RMD of roughly $189,000 at age 73, per the IRS Uniform Lifetime Table. That income is fully taxable, on top of Social Security and any other income.

2. IRMAA. Large RMDs almost guarantee the top IRMAA bracket, costing $10,000+ per year in Medicare surcharges.

3. The widow’s penalty. A surviving spouse inheriting the IRA faces single-filer brackets on similar income. See How Are Taxes Different for a Surviving Spouse?.

A retiree with all assets in traditional accounts has very little flexibility once these forces compound.

Should you reduce 401(k) contributions to invest taxable?

For some retirees, yes. The conversation centers on:

– Current vs future tax bracket. If your current bracket is the same or lower than your projected retirement bracket, traditional 401(k) loses its tax advantage.

– Expected RMD problem. If projected RMDs will push you into top brackets, reducing traditional contributions now means smaller forced distributions later.

– Estate planning goals. Roth and taxable accounts pass more favorably to heirs than traditional accounts under current rules.

For someone in the 22 or 24 percent bracket today who expects to be in the 32 percent bracket in retirement, traditional contributions actually create future tax cost rather than savings.

What about Roth 401(k) contributions instead?

Roth 401(k) contributions are the most underused tool for tax diversification.
Roth 401(k) contributions:
– Have the same 2026 limit as traditional 401(k) ($24,500, or $32,500 for 50+)

– Use after-tax dollars going in

– Grow tax-free

– Come out tax-free in retirement

– Have no RMDs as of 2024 (under SECURE 2.0)

For high earners who max out 401(k) contributions every year, splitting between traditional and Roth contributions often produces better lifetime tax outcomes than going all-traditional.

How does this affect estate planning?

Significantly. Traditional IRAs inherited by non-spouse beneficiaries must be distributed within 10 years under the SECURE Act. The distributions are taxable to the heirs.

For adult children in their peak earning years inheriting a large traditional IRA, the forced distributions often hit at top tax brackets. A $1 Million inherited IRA might net $600,000 to the heirs after federal tax alone.

Roth IRAs inherited by non-spouse beneficiaries are also subject to the 10 year rule, but distributions are tax-free. A $1 Million inherited Roth nets approximately $1 Million.

See Link For Blog 16 for the full estate planning framework.

Should you stop contributing if you already have enough?

Three considerations.
1. Employer match. Continue contributing at least enough to get the full employer match. The match is free money.

2. Tax diversification. If your traditional balance is already large, shift new contributions to Roth or taxable.

3. HSA priority. Maximize HSA contributions before extra non-match 401(k) contributions.
The HSA has better tax treatment for medical expenses.

For retirees within 5 years of retiring with $5 Million plus already saved, the conversation shifts from accumulation to optimization.

What’s the right balance of account types?

There is no single right answer, but a useful target for households over $1 Million in retirement savings is roughly:

– 40 to 60 percent in tax-deferred (traditional IRA, 401(k))

– 20 to 40 percent in tax-free (Roth IRA, Roth 401(k))

– 10 to 30 percent in taxable

The exact mix depends on:

– Current and projected tax brackets

– Years to retirement

– Estate planning goals

– Healthcare cost expectations

Most affluent retirees end up with too much in traditional accounts and not enough in Roth. The strategic response is Roth conversions, which is why so much retirement tax planning revolves around that move. See When Should You Do a Roth Conversion?.

Common Mistakes:

1. Maxing out traditional 401(k) every year without considering future tax exposure

2. Skipping Roth 401(k) contributions when available

3. Underfunding the HSA in favor of additional 401(k) contributions

4. Failing to plan for RMDs while still accumulating

5. Treating tax diversification as a retirement-only concern.