Oh, forgot to say, "There's a IRS table for that."
AI:
"Fractional interest discounts account for lack of control and marketability when valuing partial ownership in real estate or entities for IRS gift/estate tax purposes. A qualified appraisal by a certified appraiser is required to substantiate the discount, typically ranging 15-40% based on factors like ownership size, property type, and partition feasibility.
Core Calculation Steps
1. Determine whole property value: Obtain a full appraisal of the asset’s fair market value (FMV), e.g., $1M for a property.
2. Calculate pro-rata share: Multiply by the fractional interest, e.g., 50% interest = $500K undivided value.
3. Apply discounts:
• Lack of Control (DLOC): 10-30%, reflecting inability to force sales or decisions.
• Lack of Marketability (DLOM): 10-30%, for limited buyer pool and illiquidity.
• Total discount combines both, often via cost-to-partition method: Hypothetical buyer’s cost/risk of partitioning (e.g., legal fees 5-15%) plus weighted market risks (e.g., 17% in Tax Court case Ludwick using 10% partition probability and discount rate).
4. Final value: Pro-rata minus total discount, e.g., 30% discount on $500K = $350K.
Example from Case Law
In Ludwick (T.C. Memo. 2010-104), a 50% interest in a $7.25M home used cost-to-partition: 26.5% if partitioned (fees + time), 16.2% if sold whole, weighted to 17.2% discount. Courts emphasize data-driven support over guidelines.
RS Requirements
Appraisal must meet Uniform Standards (USPAP) and include comparables, partition analysis, and sensitivity testing. IRS often challenges >15% discounts without robust evidence; consult IRM 4.48.6 for guidelines."