The 14-Year Lifeline: Deferring Estate Tax Payments Under Section 6166
Federal estate taxes are generally due in full exactly nine months after the date of death. For an estate comprised of a $50M family manufacturing company that is highly profitable but cash-poor, this requirement is a death sentence. The family is forced to sell the company at a "fire sale" price just to satisfy the IRS. Section 6166 offers the ultimate procedural shield: it allows the estate to defer the payment of estate taxes attributable to a closely-held business for up to 14 years. The estate pays interest-only for the first five years, and then pays the principal in 10 annual installments. This allows the business to use its own cash flow to pay its tax bill over time, preserving family ownership. Our Family Office Group specializes in qualifying complex multi-entity structures for Section 6166 deferral.
The 35% Threshold and the Active Trade Test
To quality for Section 6166, the value of the closely-held business must exceed 35% of the "adjusted gross estate."
More critically, the business must be an "active trade or business"—not a passive portfolio of real estate or stocks. The IRS frequently audits these claims, attempting to disqualify Section 6166 for estates where the decedent was merely a passive landlord. To survive, we must prove the decedent or their agents performed significant "management and operational" services. For families with large residential portfolios, we often restructure the holdings into a formal property management LLC to satisfy the active trade requirement years before an estate event occurs.
The "2-Percent" Interest Rate Advantage
Beyond the 14-year timeline, Section 6166 offers a massive interest rate subsidy.
The first portion of the deferred tax (the "2-percent portion") is subject to a statutory interest rate of only 2%. The remaining balance is subject to only 45% of the standard underpayment rate. This makes the Section 6166 deferral the cheapest capital available in the U.S. economy. When paired with a Section 303 redemption strategy, a family can systematically pull cash out of the corporation tax-free to satisfy these low-interest installments, completely protecting their outside liquidity and ensuring the business survives the generational transition intact.