The Difference Between Asset Allocation and Asset Location
While asset allocation is the strategy of deciding "what to invest in and how much," asset location is the strategy of deciding "which account to place each asset in." Many investors pay attention to asset allocation but overlook asset location. However, simply optimizing account placement with the same portfolio composition can improve after-tax returns by 0.5-1.0% annually. Over 20 or more years of long-term investing, this difference can translate into millions of yen in asset differences.
The main account types available to individual investors in Japan are NISA (Nippon Individual Savings Account, a tax-exempt account), iDeCo (individual-type Defined Contribution pension, offering income deduction plus tax-exempt investment gains), and tokutei koza (specified accounts with tax withholding). Since each has different tax characteristics, strategically selecting which assets to place in each account can maximize the tax efficiency of the overall portfolio. The basic principle is to "place assets with the highest tax burden in tax-exempt accounts, and assets with the lowest tax burden in taxable accounts."
Optimal Asset Placement by Account Type
The principle for NISA accounts is to place assets with the highest expected returns. The benefit of tax exemption increases as profits grow larger, making equity index funds and emerging market equity funds - assets expected to deliver high long-term returns - the optimal choice. iDeCo offers the advantage of income deduction, so placing assets with high dividend and interest income, such as bond funds and REITs, is effective. In taxable accounts, this income would be taxed annually, but within iDeCo it is reinvested tax-free.Guides on using NISA and iDeCo effectively also provide specific explanations of optimal placement by account type.
In tokutei koza (taxable accounts), place tax-efficient assets. Specifically, candidates include growth stock funds with low dividend yields focused on capital gains, index funds that do not distribute dividends, and foreign assets eligible for foreign tax credits. In taxable accounts, taxation on unrealized gains is deferred until sale, so assets intended for long-term holding with low trading frequency are also suitable. The ability to use loss offsetting and loss carryforward is another advantage of taxable accounts.
Practical Steps for Asset Location Strategy
To implement an asset location strategy, first determine the overall portfolio's asset allocation (target allocation). Next, evaluate the tax characteristics of each asset (dividend yield, expected capital gains, trading frequency) and fill the tax-exempt account capacity starting with the assets that have the highest tax burden. Adjust so that the combined allocation across all accounts matches the target allocation, taking into account NISA's annual investment limit and iDeCo's contribution cap.
An important caveat is that optimizing asset location makes rebalancing more complex.Books on tax optimization for investments point out that when different assets are held in different accounts, the most tax-efficient rebalancing method is cash flow rebalancing - adjusting where new funds are directed. Since buying and selling within tax-exempt accounts incurs no tax cost, prioritize rebalancing within NISA and iDeCo, and minimize sales in taxable accounts.
Next Actions for Optimizing Asset Location
To implement an asset location strategy, start by creating a list of all your accounts (NISA, iDeCo, tokutei koza, bank deposits) showing which assets are in each account and how much. Next, evaluate the tax characteristics of each asset. Assets with high dividend yields (REITs, high-dividend stock funds) are taxed on dividends annually, giving them higher priority for placement in tax-exempt accounts. Assets focused on capital gains (growth stock funds) have relatively high tax efficiency even in taxable accounts since taxation is deferred until sale.
As a specific optimization, consider placing equity index funds with the highest expected returns in your NISA account, bond funds and REITs in iDeCo, and index funds with low distributions in your tokutei koza. Use our compound interest calculator to simulate the difference between pre-tax and after-tax returns, and confirm the 20-year asset difference from asset location optimization to experience the effectiveness of this strategy firsthand.