Assigning Assets into Tax Buckets

Treat your and your spouse’s portfolios as a unified whole. Avoid making changes that incur significant tax costs merely for optimal asset location. Instead, gradually adjust by strategically reinvesting distributions in a tax-efficient manner, especially if tax-advantaged account space is limited. Take taxable distributions in cash and reinvest them in a tax-efficient manner.

Prioritize tax-advantaged accounts whenever possible.

1.

Assess Portfolio Tax Efficiency: Evaluate the tax implications of each investment in your portfolio. Understanding the tax efficiency of each asset class will guide your asset placement strategy.

2.

Prioritize Placement of Least Tax-Efficient Funds: Maximize the use of your tax-advantaged accounts by placing your least tax-efficient investments in them first. If these accounts become full, shift to more tax-efficient options, such as stock index funds or municipal bond funds, for your taxable accounts.

3.

Optimize International Stock Funds Placement: Place international stock funds in taxable accounts to capture the IRC §901, “Taxes of foreign countries and of possessions of the United States” foreign tax credit (section “International Equities: ADRs, Funds, and the Foreign Tax Credit”) for withholding taxes paid abroad. This credit is lost inside tax-advantaged accounts, where foreign taxes are withheld at source with no offsetting U.S. credit. The value of the credit depends on the fund’s foreign income ratio, the treaty withholding rate, and your marginal bracket.

4.

Allocate High Growth Stock Funds Strategically: For investments expected to yield high returns, consider placing them in accounts like Roth IRAs or HSAs where they can grow tax-free, are not subject to Required Minimum Distributions (RMDs), and do not count as income for Social Security tax purposes. If your tax-advantaged space is exhausted and your taxable estate is approaching the $15,000,000 federal exemption made permanent by OBBBA ( IRC §2010), the same highest-growth assets are also the strongest candidates to transfer into an irrevocable grantor trust — see section “Intentionally Defective Grantor Trusts (IDGTs)” and section “Spousal Lifetime Access Trusts (SLATs)” — so the future appreciation compounds outside your estate entirely.

5.

Position Tax-Efficient Funds: Place tax-efficient funds in any account type. If space allows in your tax-advantaged accounts, it facilitates easier rebalancing of your stock/bond ratio without incurring tax consequences. In taxable accounts, consider using new contributions for rebalancing to avoid capital gains taxes.

Locate for the heir as well as for yourself. The three account types die differently, and for a portfolio large enough to outlive you that decides placement as much as annual tax drag does. Taxable equities are the best asset to leave: the IRC §1014 step-up erases every deferred gain, so the location that was cheapest to hold is also free to inherit. A Roth is next: no tax to you, none to the heir, and the ten-year payout runs tax-free. A traditional IRA or 401(k) is the worst: every dollar is income in respect of a decedent under IRC §691, “Recipients of income in respect of decedents”, with no step-up, taxed to the heir at the heir’s rates inside the ten-year window of IRC §401(a)(9)(H) (section “Tax Planning for Inherited IRA”), so a large pre-tax balance often lands in a child’s peak earning years at 37%. Holding slow-growing bonds in the traditional account and the fastest growers in Roth and taxable follows from this as much as from tax efficiency: it caps the size of the account the government co-owns and lets the assets that will be stepped up or withdrawn tax-free do the compounding. If the traditional balance is still large in your sixties, that is the case for the conversion ladder in chapter “Tax-Efficient Decumulation”.