The passage of the Tax Cuts and Jobs Act (TCJA) introduced a wave of tax planning opportunities across virtually every sector of the economy. For private lenders and mortgage fund operators, one provision in particular has reshaped how funds are structured: the qualified business income (QBI) deduction under Internal Revenue Code Section 199A. While the broader application of this deduction to pass-through entities came with significant limitations that excluded most non-conventional lending operations, Real Estate Investment Trusts emerged as a clear and compelling vehicle for capturing the full 20% deduction on qualifying income.
This article examines why private REITs have become an increasingly popular structural choice for mortgage funds, how the Sub-REIT model works in practice, and what fund managers need to consider before pursuing this approach.
Understanding the REIT Framework
At its core, a REIT is a corporate entity that holds real estate or real estate-related assets, including mortgage loans, and elects to be taxed under a special framework that permits pass-through treatment of income. Rather than paying corporate-level tax, a qualifying REIT distributes the vast majority of its earnings to shareholders, who then report that income on their individual returns.
To achieve and maintain REIT status, an entity must satisfy several structural and operational requirements established in the Internal Revenue Code:
- Corporate taxation election. The entity must be structured as, or elect to be taxed as, a corporation.
- Distribution mandate. At least 90% of the REIT’s taxable income must be paid out to shareholders as dividends each taxable year.
- Asset composition. A minimum of 75% of the REIT’s total assets must consist of real estate, real estate-related holdings, cash, or U.S. Treasury securities.
- Income sourcing. At least 75% of the REIT’s gross income must derive from real estate-related sources, including mortgage interest, rents, and gains from real property sales.
- Ownership dispersion. The REIT cannot be “closely held,” which means that no combination of five or fewer individuals may hold more than 50% of the outstanding shares during the last half of the taxable year.
- Minimum shareholder count. The REIT must have at least 100 beneficial owners (the so-called “100 shareholder rule”).
These requirements apply equally whether the REIT is publicly traded on a stock exchange or privately held under an exemption such as Regulation D.
Why Section 199A Changed the Calculus for Mortgage Funds
Before the TCJA, many mortgage fund managers had little reason to consider a REIT structure. The compliance costs and administrative complexity typically outweighed any marginal tax advantage. The Section 199A deduction changed that equation significantly.
Under Section 199A, REIT dividends are specifically enumerated as qualifying for the 20% QBI deduction. Unlike other types of pass-through income, which are subject to wage limitations, taxable income thresholds, and specified service trade or business (SSTB) restrictions, REIT dividends receive the deduction without these constraints. For investors in the highest marginal tax bracket, this effectively reduces the federal tax rate on REIT dividend income from 37% to 29.6%, a meaningful reduction that compounds across a portfolio of meaningful size.
This straightforward qualification stands in contrast to the experience of most private lending operations structured as partnerships or LLCs. Many non-conventional lenders discovered that the wage limitations and SSTB exclusions under Section 199A rendered the pass-through deduction largely inaccessible for their businesses and their investors.
The UBTI Advantage for Tax-Exempt Investors
Beyond the Section 199A deduction, REITs offer a second significant tax benefit that is often underappreciated: exemption from Unrelated Business Taxable Income (UBTI).
For mortgage funds with investors holding Individual Retirement Accounts (IRAs), self-directed retirement accounts, or other qualified plans, UBTI can create unexpected and unwelcome tax obligations. When a tax-exempt account invests in a pass-through entity that uses leverage, as most mortgage funds do, the debt-financed income can trigger UBTI, requiring the retirement account to file a return and pay taxes on that income.
REIT dividends, however, are generally not treated as UBTI. This means that retirement account holders investing through a REIT structure can receive distributions without triggering the same adverse tax consequences. For fund managers seeking to attract capital from self-directed IRA investors, this structural benefit can be a meaningful differentiator.
The Sub-REIT Strategy: A Practical Solution
Despite these advantages, converting an existing mortgage fund to a full REIT is rarely straightforward. Most private lending funds are organized as LLCs taxed as partnerships. Transitioning such an entity to corporate taxation involves substantial legal, tax, and operational hurdles, particularly when the fund has a large and diverse investor base.
The conversion process can trigger recognition of built-in gains, require consent from existing members, and create administrative disruption that is difficult to justify for a fund with ongoing lending operations. For these reasons, a direct conversion is seldom the preferred path.
Instead, the market has converged on an alternative approach: the Sub-REIT. Under this model, the existing mortgage fund creates a partially-owned subsidiary that is organized and operated to qualify as a REIT. The parent fund holds a significant ownership interest in the Sub-REIT, while the remaining shares are distributed among at least 99 additional investors to satisfy the 100-shareholder requirement and ownership dispersion tests.
The parent mortgage fund then contributes or transfers a portion of its loan portfolio to the Sub-REIT. Provided the Sub-REIT independently satisfies all of the REIT qualification requirements, the income flowing through this subsidiary receives REIT tax treatment, and the resulting dividends paid back to the parent fund and its investors qualify for the Section 199A deduction.
Why the Sub-REIT Model Works
The Sub-REIT approach offers several distinct advantages over a full fund conversion:
Preservation of existing fund structure. The parent mortgage fund continues to operate as an LLC taxed as a partnership. Existing investor agreements, management arrangements, and operational workflows remain intact. This avoids the disruption, consent requirements, and potential tax consequences associated with a full restructuring.
Flexibility and reversibility. Because the Sub-REIT is a separate entity, the parent fund retains the ability to adjust its strategy if the tax landscape changes. If a future administration repeals or modifies the Section 199A deduction, the fund can wind down or restructure the Sub-REIT without unwinding the entire fund.
Incremental implementation. Fund managers can transfer assets to the Sub-REIT gradually, testing the structure and managing compliance obligations as the subsidiary grows. This measured approach reduces risk compared to an all-or-nothing conversion.
Investor optionality. The Sub-REIT can accommodate investors who specifically want REIT tax treatment, while the parent fund continues to serve investors who prefer the existing partnership structure.
Compliance Considerations and Licensing Requirements
Establishing a Sub-REIT involves more than just filing corporate documents and making a REIT election. Fund managers must carefully address several compliance issues.
Asset transfer and lending regulations. Because the REIT’s 75% asset test requires the Sub-REIT to hold qualifying real estate assets, the parent fund will typically need to transfer mortgage loans to the subsidiary. This transfer must comply with applicable state and federal lending regulations. Depending on the jurisdiction, the Sub-REIT may need to obtain its own lending license to hold and service these loans.
In California, for example, many Sub-REITs obtain a California Finance Lenders License (formerly the California Lenders License) to ensure they can compliantly acquire and hold mortgage assets transferred from the parent fund. Failure to secure appropriate licensing can create regulatory exposure for both the Sub-REIT and the parent entity.
Ongoing REIT compliance. Maintaining REIT status requires continuous monitoring of the asset composition, income sourcing, distribution, and ownership tests. The administrative burden of tracking these requirements is substantial and typically requires dedicated accounting and legal support.
Securities considerations. If the Sub-REIT offers shares to outside investors under Regulation D, the offering must comply with applicable federal and state securities laws, including the preparation of a private placement memorandum, investor qualification procedures, and ongoing reporting obligations.
When Does a Sub-REIT Make Sense?
A Sub-REIT is not the right solution for every mortgage fund. The compliance costs, including annual audits, specialized tax return preparation (Form 1120-REIT), legal counsel, and ongoing regulatory monitoring, are material. For smaller funds, these expenses can easily exceed the tax savings generated by the REIT structure.
As a general guideline, Geraci LLP recommends that fund managers consider exploring a Sub-REIT structure once the fund has accumulated approximately $40 million to $50 million in assets under management. At this scale, the aggregate tax savings to investors from the Section 199A deduction and UBTI elimination typically begin to justify the incremental costs of establishing and maintaining the Sub-REIT.
Funds below this threshold may find that the same objectives can be partially addressed through other tax planning strategies, and should consult with experienced fund formation counsel before committing to the REIT path.
Benefits for Offshore and International Investors
An additional consideration that has driven adoption of Sub-REITs among larger mortgage funds is the favorable treatment of certain REIT distributions for offshore investors. The Foreign Investment in Real Property Tax Act (FIRPTA) imposes withholding obligations on certain dispositions of U.S. real property interests by foreign persons. However, specific exemptions and reduced withholding rates may apply to REIT distributions in certain circumstances, making the REIT structure more attractive for funds seeking to raise capital from international sources.
Fund managers with an existing or prospective international investor base should analyze the FIRPTA implications carefully with qualified tax counsel to determine whether a Sub-REIT structure enhances the fund’s appeal to foreign capital.
Looking Ahead: The Sub-REIT Landscape in 2025
Since the TCJA’s enactment, the Sub-REIT model has matured from an emerging concept into a well-established structuring tool for sophisticated mortgage fund operators. As more funds have adopted this approach, the legal and accounting infrastructure supporting Sub-REIT formation and compliance has expanded considerably, reducing implementation timelines and, to some degree, associated costs.
However, fund managers should remain attentive to the legislative landscape. The Section 199A deduction, as currently codified, is scheduled to sunset at the end of 2025 absent congressional action to extend or make it permanent. While there is bipartisan support for extending the provision, the outcome remains uncertain. Funds that have already established Sub-REITs will want to monitor developments closely, and those considering the structure should factor the potential expiration into their cost-benefit analysis.
Regardless of the Section 199A outlook, the UBTI exemption and benefits for international investors remain independent of the TCJA provisions and will continue to provide structural value even if the pass-through deduction sunsets.
How Geraci LLP Can Help
Geraci LLP has extensive experience advising private lenders and mortgage fund managers on fund formation, REIT structuring, and regulatory compliance. Our attorneys work with fund operators at every stage, from initial feasibility analysis through Sub-REIT formation, securities offerings, licensing, and ongoing compliance support.
If your fund is approaching the $40 million to $50 million AUM threshold, or if you are exploring ways to enhance your fund’s tax efficiency and investor appeal, contact Geraci LLP to discuss whether a Sub-REIT structure is the right fit for your lending operation.
Geraci LLP 90 Discovery, Irvine, CA 92618 (949) 403-3488
