Strategies for Building Wealth in Your 50s and Utilizing Tax-Free Investment Programs | A Comprehensive Guide Covering Everything from the Features of iDeCo and NISA to Product Selection and 10-Year Savings Simulations

1. Asset Management Based on Your Lifestyle

When starting to manage your assets, the most important step is to clearly define the lifestyle you want to achieve.
In particular, if your goal is to prepare for retirement, you need to think through the process step by step: first, how you plan to work in the future; second, how much you can expect to receive from public pensions; and third, if public pensions alone won’t cover your living expenses, exactly how much you need to set aside.
This is nothing other than the approach known as “planning your asset management by working backward from your goal.”
Based on this, when it comes time to actually invest, you will need to establish a concrete plan by determining which tax-exempt schemes to use and which financial products to invest in.

In this article, I will explain the overview of the major tax-exempt investment schemes—Defined Contribution (DC) Pensions and the Small Amount Investment Non-Taxable Scheme (NISA)—how to select financial products, how to conduct a comprehensive asset management simulation, and approaches tailored to different age groups.

2. Overview and Features of Tax-Exempt Investment Schemes

The two representative tax-exempt schemes generally available to salaried employees are the Defined Contribution Pension (DC) and the NISA (Small Amount Investment Non-Taxable Account).
Normally, capital gains from investments are subject to a 20.315% capital gains tax, but by utilizing these schemes, those gains become tax-exempt.
However, there are significant differences in the design of the DC and NISA systems.

The Key Differences Between DC and NISA and How to Choose Between Them

The biggest difference stems from the fact that DC is a “pension system.”
Because DC is a pension system, it offers a powerful tax incentive: contributors can claim an income tax deduction on their contributions (note that contributions to employer-sponsored DC plans are also excluded from the calculation of social insurance premiums).
On the other hand, there is a restriction that, in principle, withdrawals are limited until the age of 60.
In contrast, while NISA requires investments to be made from your “take-home pay” after income tax and social insurance premiums have been paid, it offers high liquidity (an advantage) in that you can sell your investments and convert them to cash at any time.
Although there are significant differences between these two systems, the general rule of thumb is to choose the one that best aligns with your “goals” when you are unsure which to use.

• Saving for Retirement
  Prioritize using defined contribution (DC) plans with withdrawal restrictions
• Building savings to cover various life events that arise over the course of one’s life (such as children’s education expenses, home purchase costs, renovation expenses, and long-term care costs)
  Utilize NISA accounts, which allow for withdrawals at any time

In the case of Mr. A, which is cited as an example here, since the clear objective is to save for retirement, it would be advisable to first consider using an employer-sponsored DC plan or an Individual-Type Defined Contribution Pension (iDeCo).

Comparison of iDeCo and NISA

iDeCo (Individual-Type Defined Contribution Pension)

• Eligibility
  National Pension Scheme participants (*Other eligibility requirements apply, such as eligibility categories and maximum contribution limits)
• Enrollment Period
  Ages 20 to 64
• Benefit Commencement
  Ages 60 to 75
• Tax Benefits
  Contributions are fully tax-deductible
  Investment gains are tax-exempt
  Public pension deductions and retirement income deductions apply upon receipt
• Investment Options
  Principal-protected products (such as time deposits and insurance products), mutual funds
• Annual Investment (Contribution) Limit
  20,000 to 68,000 yen per month (*The limit varies depending on your public pension insurance category and your enrollment status in your employer’s corporate pension plan)

NISA (Small Amount Investment Non-Taxable Scheme)

• Eligibility
  18 years of age or older (as of January 1)
• Enrollment Period and Benefit Start Date
  No time limit
• Tax Benefits
  Investment gains are tax-exempt only during the investment period (no tax benefits apply at the time of contribution or withdrawal)
• Investment Targets
  [Regular Savings Investment Category] Investment trusts that meet the criteria specified by the Financial Services Agency
• [Growth Investment Category] Listed stocks, investment trusts, etc. (*Excludes stocks under special treatment or supervision, investment trusts with a term of less than 20 years, monthly distribution-type investment trusts, and certain investment trusts that use derivative transactions)
  • [Regular Savings Investment Category] Mutual funds that meet the criteria specified by the Financial Services Agency
  • [Growth Investment Category] Listed stocks, mutual funds, etc. (*Excluding stocks subject to delisting or special supervision, mutual funds with a term of less than 20 years, monthly distribution-type mutual funds, and certain mutual funds that use derivative transactions)
• Annual Investment Limits
  Regular Savings Investment Limit: 1.2 million yen per year / Growth Investment Limit: 2.4 million yen per year
• Lifetime Investment Limit
  18 million yen (of which 12 million yen is allocated to the Growth Investment Limit)

3. How to Choose Mutual Funds

Once you’ve decided which program to use (iDeCo or NISA), the next step is to select the actual investment products.
Understanding the perspective from which mutual fund developers create their products can help guide your selection.
Product Development Perspectives and Personas (Target Customer Profiles)
When structuring a mutual fund, the first step is to define a “persona” (target customer profile) and anticipate investors’ needs.
The starting point for development is considering whose concerns the mutual fund is designed to address.
From the investor’s perspective, it is crucial to determine whether a mutual fund can effectively address their specific concerns.

Selection of Investment Assets

While mutual funds can invest in a wide variety of assets worldwide, risk and return vary significantly depending on the specific assets chosen.
In addition to stocks, bonds, and real estate investment trusts (REITs), there are indications that commodities and, in the future, cryptocurrencies may also be included in mutual fund portfolios.
Therefore, it is essential to choose a mutual fund that includes investment assets you can understand.

Choosing an Investment Strategy (Active vs. Passive Management)

There is a key decision point: whether to choose “active management” or “passive management (index investing).”
Your approach to risk varies significantly depending on which strategy you choose.
Even within passive management, the risk-return characteristics differ depending on the benchmark (index).
For example, passive management of small- and mid-cap stocks may actually carry less risk than active management of large-cap stocks.
If you choose active management, be sure to verify whether the fund has a track record of outperforming its benchmark over the long term.

Checking Investment Trust Structures and Costs

You also need to check the structure of the investment trust.
In particular, “funds of funds” that include foreign investment trusts tend to have higher costs (such as management fees).
Take currency-selection funds, which have become popular among younger generations, as an example. Since these funds rely on foreign investment trusts as a minimum guarantee system, custodian fees apply, making them investment trusts with effectively high costs.

The Importance of Distribution Policies

Distribution policies are also extremely important.
Since asset management companies have fixed sources of funds available for actual distributions and each company has its own internal rules, caution is required when purchasing distribution-type mutual funds.
However, in retirement asset management, receiving distributions has the same effect as drawing down assets, so distribution-type mutual funds may also be a viable option.

Asset Accumulation in Old Age and Specific Product Selection in Mr. A’s Case

Given these factors, balanced mutual funds emerge as a strong candidate for Mr. A’s specific investment choices for building wealth in his later years.
A specific example of a balanced fund is the “Tawara No-Load Balance (8-Asset Equal-Weight Type)” managed by Asset Management One.
Thanks in part to favorable market conditions, this fund has achieved a total return of +90.9% from July 28, 2017 (the fund’s inception date) through December 30, 2025, which translates to an annualized return of approximately 8% to 9%.
For novice investors in particular, the approach of entrusting their investments to a fund manager through a balanced fund is an effective strategy.
When managing assets starting in one’s 50s, it is generally advisable to make a balanced fund the core of one’s portfolio.
There are various other combinations of balanced mutual funds available.

In addition to the “4-Asset Equal-Weight Balance” strategy adopted by the Government Pension Investment Fund (GPIF)—which allocates 25% each to domestic equities, foreign equities, domestic bonds, and foreign bonds—there are also “6-Asset Equal-Weight Balance” and “8-Asset Equal-Weight Balance” strategies that add domestic REITs and foreign REITs to these categories.
Incidentally, the GPIF’s basic portfolio has delivered an annualized return of +4.51% from fiscal year 2001 through the second quarter of fiscal year 2025 (end of September 2025).
This can be considered a sufficient return in terms of protecting assets from inflation.

4. Investment Simulation for Those in Their 50s

We will examine the question, “What would the investment results be if one started investing in their 50s?” using specific figures.
As a premise, we assume that a balanced fund was used and achieved an annual return of 4%.

In addition, starting in 2027, the monthly contribution limit for iDeCo for salaried employees is scheduled to increase from 16,000 yen to 20,000 yen. Therefore, let’s consider a scenario where a person contributes 60,000 yen per month for 10 years, from age 54 to 64.
The specific progression of the assets can be divided into the following three periods:

① Accumulation Period (10 years from age 54 to 64)

If you invest 60,000 yen per month for 10 years at an annual return of 4%, the total investment amount (cumulative investment) will be 7.2 million yen.
However, with the addition of a 4% annual return, the end-of-month asset value at the end of the 10-year accumulation period (at age 65) will reach approximately 8.83 million yen.

② Accumulation Halt and Investment Continuation Period (10 years from age 65 to 74)

After age 65, no new investments are made; instead, the approximately 8.83 million yen on hand continues to be invested at an annual rate of 4%.
After this 10-year period of “continuing only the investment,” the end-of-month asset value at the end of age 74 (at age 75) will grow to approximately 13.07 million yen.

③ Withdrawal Period (20 years from age 75 onward)

The approximately 13.07 million yen accumulated by age 75 will be withdrawn in fixed monthly amounts over the next 20 years, from age 75 to 94, while continuing to be invested at an annual rate of 4% (fixed monthly withdrawals).
According to this simulation, it will be possible to withdraw approximately 79,000 yen per month for living expenses.

Summary and Benefits of the Simulation

Over the 20-year period, you can supplement your living expenses with 79,000 yen per month, and the total amount received will reach approximately 19 million yen.
This demonstrates that the initial total investment of 7.2 million yen yields a very significant return.

Even if you start in your 50s, rather than stopping your investments entirely at age 65, you can create significant financial flexibility for your retirement by continuing to invest until age 75 and then making partial withdrawals while maintaining your investments.

Furthermore, since salaries generally peak in one’s 50s, this approach also makes sense because it allows you to maximize the tax benefits of defined contribution (DC) plans, such as the income tax deduction for contributions.

5. A Visualization of Asset Building and Generation-Specific Approaches

As a basic approach to securing retirement funds, the theory is that the “core” portion of a core-satellite strategy should consist primarily of globally diversified investments—such as global equity funds that invest in a mix of global stocks and bonds—with regular, long-term contributions.

However, the appropriate systems and approaches vary depending on generation, family structure, and employment status.
The examples and approaches by generation outlined in the materials are as follows.

Case of a Stay-at-Home Spouse (Person B in the document)

Since they have no or limited earned income, they cannot benefit from the tax incentive—the “full income tax deduction for contributions”—which is the greatest advantage of a DC plan.

Therefore, while they may have previously managed their investments primarily through NISA funds focused on stocks and other assets, the recommended approach going forward is to adopt a hybrid strategy by adding DC balanced funds to their portfolio.

Case of the Younger Generation Entering the Workforce (Eldest Daughter, Ms. C)

As an initial step, it is recommended to start regular savings investments by utilizing the “regular savings investment allowance” under NISA, which is easy to get started with.

Since the younger generation has a very long investment horizon during which they can pursue returns, the standard approach is to continue investing in high-growth products, such as global equity funds, to maximize the benefits of compound interest.

After that, depending on eligibility for employer-sponsored DC plans or iDeCo, it is wise to divide regular investments between the two systems: NISA and DC.

Case of a Student (Eldest Son, Mr. D)

Even for university students, unless they are enrolled in a government-funded program (such as the Special Exemption System for Student National Pension Premiums), using a portion of their part-time income to start regular investments through NISA early on is an effective option for building future assets.

Conclusion: The Mindset for Long-Term Investing

The essentials of asset building can be summarized in the following three points.

1. Start making regular investments as soon as possible using tax-exempt programs (DC and NISA)
2. Choose your investment amounts and targets wisely
3. Continue investing over the long term while managing risk so that you can maintain your current lifestyle even if there is a market crash on the scale of the Lehman Shock

During historic financial crises or periods of sharp market declines, psychological anxiety can make you feel tempted to stop investing. However, continuing to make regular contributions without panicking is an absolute prerequisite for reaping the long-term benefits of compound interest.

Furthermore, by starting your regular investments as early as possible, you can secure a longer investment horizon, which in turn allows the power of compound interest to work more effectively.

As you continue making regular investments over 20 or 30 years, you will inevitably experience significant market downturns on numerous occasions.

However, by cultivating financial literacy through these experiences, you can build a solid foundation of wealth that remains unshaken by market fluctuations.