Net Investment Income Tax (NIIT)

The Net Investment Income Tax (NIIT) is a 3.8% surtax on certain investment income, including net rental income, capital gains, and passive income from commercial real estate, for taxpayers above defined income thresholds. NIIT applies in addition to regular income and capital gains taxes and can reduce after-tax returns on dispositions, refinancing gains, and regular property income. For sponsors, investors, and lenders, modeling NIIT helps produce realistic net cash flow and exit proceeds estimates, especially for high-income stakeholders whose tax liabilities can materially affect distributions and debt servicing capacity.

Borrowers and underwriters include NIIT in after-tax cash flow models when sponsors or owners meet income thresholds that trigger the surtax, and when forecasted dispositions generate taxable capital gains. Lenders consider NIIT impacts when assessing borrower liquidity and the sufficiency of expected sale proceeds to repay loans. Sponsors may evaluate structures that alter the incidence of NIIT, such as changes in holding entity, but any planning should be coordinated with tax counsel. Accurately forecasting NIIT ensures conservative underwriting and reasonable expectations for investor returns and debt repayment at exit.

NIIT is important because it raises the effective tax rate on CRE income and gains for affected taxpayers, which can materially lower net proceeds and reduce cash available to service debt or distribute to investors. Ignoring NIIT leads to overstated after-tax returns and potential shortfalls at sale or refinance. For lenders, recognizing NIIT exposure helps avoid unexpected borrower distress driven by tax liabilities. For sponsors and investors, factoring NIIT into deal economics shapes valuation, hold period decisions, and the attractiveness of tax-deferral strategies versus immediate disposition.