Net Investment Income Tax: What It Is and Planning Considerations
For many high income earners, the net investment income tax is an extra layer of federal tax that shows up on the return without much warning. The NIIT applies on top of regular income tax to certain investment income once modified adjusted gross income passes a set threshold. Those thresholds are not indexed for inflation, so more households have become subject to the tax over time.
Because the NIIT is driven by both how much you earn and how your investments are structured, it is a natural place where wealth management and tax planning meet. Below, we explain what the tax covers, what it does not, and the planning considerations worth discussing with your advisors.
Start Here: A Complimentary Wealth and Tax Review
The NIIT is easier to plan around when you can see your full picture. Compound offers a complimentary, no-obligation wealth and tax review that may include:
Recent tax returns: whether the NIIT applied and which income drove it
Your investment portfolio: where interest, dividends, and gains are being generated
Real estate and business interests: whether income is treated as passive or active
Retirement accounts: how withdrawals and conversions may affect income levels
Upcoming events: sales, bonuses, or other income spikes worth planning for
Request your wealth and tax review.
What Is the Net Investment Income Tax?
The net investment income tax is a federal surtax that applies to individuals, estates, and trusts. For individuals, it generally applies to the lesser of net investment income or the amount by which modified adjusted gross income exceeds a threshold based on filing status. Estates and trusts face much lower thresholds, which matters for families using trusts in their estate plans. The tax is reported on its own form with your annual return.
Rather than focusing on specific rates and thresholds, which can change with legislation, the more useful questions are what kind of income is included and how much flexibility you have to manage it. Households most often affected include business owners with passive interests, real estate investors, executives with large taxable portfolios, and anyone with a one-time event such as the sale of a property or a block of stock.
What Income Is Subject to the NIIT?
Net investment income generally includes:
Interest and dividends from taxable accounts
Capital gains from selling stocks, bonds, mutual funds, and investment real estate
Rental and royalty income, unless it is earned in an active trade or business
Passive business income from businesses in which you do not materially participate
Non-qualified annuity income
It generally does not include:
Wages and self-employment income
Distributions from qualified retirement plans and IRAs
Tax-exempt interest, such as most municipal bond interest
Income from a trade or business in which you materially participate
Certain gains on the sale of an active business interest
Distributions from retirement accounts are not net investment income themselves, but they can raise modified adjusted gross income, which may push other investment income over the threshold.
Investment Income Tax Planning Considerations
Every situation is different, but these are areas often reviewed:
1. Asset Location and Tax-Aware Investing
Holding income-producing investments in tax-deferred or tax-free accounts, and more tax-efficient investments in taxable accounts, may reduce the investment income tax over time. Tax-loss harvesting and thoughtful rebalancing may also help offset gains. See investment management for high net worth individuals.
2. Timing Large Gains
Spreading the sale of appreciated assets across tax years, or using an installment sale for a business or property, may help manage income in any one year. For major transactions, read about real estate capital event tax planning.
3. Material Participation and Real Estate
Rental income may avoid the NIIT when it is earned in a trade or business in which you materially participate, which can include certain real estate professionals. The rules are detailed and require good records. Learn more about tax planning for real estate owners.
4. Roth Conversions
A Roth conversion increases income in the year of conversion, which may affect the NIIT that year. Future qualified Roth withdrawals, however, generally do not increase modified adjusted gross income, which may help in later years. Read more on the convert pretax to Roth strategy.
5. Charitable Giving
Gifting appreciated securities to charity or a donor-advised fund may avoid realizing gains, and charitable trusts can be part of a broader plan. These strategies should be coordinated with your estate attorney.
6. Trust Distributions
Because trusts reach the NIIT threshold quickly, distribution decisions may shift where income is taxed. This needs careful coordination between your tax advisor and estate attorney.
To see how taxes may affect long-term growth, try the Compound calculator. Results are hypothetical and for illustration only, but they often show why after-tax returns deserve attention.
Why Tax and Wealth Planning Should Work Together
The NIIT depends on portfolio decisions, business structure, real estate activity, and retirement account choices. When those are managed by people who rarely talk, the tax often shows up as a surprise. Compound brings wealth management, investment management, and tax planning and preparation together, so investment and tax decisions can be evaluated at the same time. See also why many high income individuals may miss planning considerations.
Compound works with high income earners, investors, and families throughout Wisconsin, including Milwaukee, Madison, Brookfield, Waukesha, Green Bay, and La Crosse, as well as surrounding areas.
Want to know how the NIIT affects you? Request a complimentary wealth and tax review.
Frequently Asked Questions
What is the net investment income tax?
The net investment income tax is a federal surtax on certain investment income for individuals, estates, and trusts whose modified adjusted gross income exceeds a threshold based on filing status.
What income counts for the NIIT?
Generally interest, dividends, capital gains, rental and royalty income, passive business income, and non-qualified annuity income. Wages, self-employment income, and retirement plan distributions are generally excluded.
Are NIIT thresholds adjusted for inflation?
No. The thresholds are not indexed for inflation, which is one reason more households may become subject to the tax over time.
Can a Roth conversion affect the NIIT?
A conversion raises income in the conversion year, which may increase the NIIT that year. Qualified Roth withdrawals later generally do not raise modified adjusted gross income.
How can high income earners reduce investment income tax?
Options worth discussing include asset location, tax-loss harvesting, timing gains, material participation planning, charitable giving, and trust distribution planning. The right mix depends on your full financial picture.
Compound is a registered investment adviser. Registration does not imply a certain level of skill or training. This article is for informational and educational purposes only and should not be construed as personalized investment, tax, or legal advice. Tax laws are complex and subject to change. Strategies discussed may not be suitable for everyone, and there is no guarantee that any strategy will achieve its objectives or reduce taxes. Calculator results are hypothetical, are not guarantees of future results, and do not reflect any actual investment. Investing involves risk, including possible loss of principal. Diversification does not ensure a profit or protect against loss. Please consult your tax, legal, and financial professionals before acting on any information in this article. For more information, see Compound's Form ADV, available at adviserinfo.sec.gov.
About Compound Wealth
Compound Wealth offers integrated tax planning, wealth management, accounting, and business transition services for business owners, professionals, real estate investors, and families. By considering these areas together, the firm provides a coordinated planning approach designed to help clients navigate financial complexity.
