The final episode of the cost segregation series. Wes covers the grouping election, the one tax election that determines whether building losses can offset practice income or get suspended indefinitely. Includes the self-rental asymmetry, how to execute the election, five pros, six cons, and when to make it.Key Topics Covered1. The Self-Rental AsymmetryRental income from a building you operate in a non-passive (taxable)Rental losses from that same building are passive (trapped)Result: a $300,000 year-one cost segregation loss cannot reduce your W2 or K-1; it is suspended until the building has future taxable profit2. What the Grouping Election DoesIRC Section 1.469-4(f): elect to treat the building LLC and practice S corp as one economic unitLosses in the building LLC that become non-passive can now offset W2 and K-1 income directlyExample: $400,000 building loss reduces $1M of practice income to $600,000, saving $150,000–$200,000 in taxes in year one3. Qualification and TimingQualifies when: same ownership percentage in building and practice, dentist is the only tenant, same locationMust be elected on the original tax return for the first year of building ownership; it cannot be made retroactivelyCPA must attach a disclosure statement identifying the grouped activities alongside Form 85824. Five Pros of the Grouping ElectionLoss utilization: building losses offset W2 and K-1 in the year they are generatedCost segregation amplification: first-year bonus depreciation becomes immediately usable instead of frozenFixes the asymmetry: losses become non-passive, matching the non-passive character of building incomeSimpler participation: one shared material participation test for both activitiesPredictable: no annual suspended loss ledger to manage5. Six Cons of the Grouping ElectionOne-way door: binding in all future years; can only be undone by a material change in facts (e.g., selling the practice)Partial sale complexity: selling the building without the practice creates complicated suspended loss treatmentForfeits passive shelter: building losses can no longer offset passive income from outside rental propertiesDSO or partner disruption: any equity sale that misaligns building and practice ownership breaks the grouping1031 exchange complications: a grouped building is harder to roll into a like-kind exchangeSemi-retirement trap: when practice income drops, the non-passive characterization no longer helps and can hurt6. Best-Case ScenarioDentist buys practice without building, grows income into the top brackets over 5+ years, then buys the buildingCommissions cost seg study in year one of building ownership, makes the grouping election, and offsets peak practice incomeWorst case: buying practice and building simultaneously at low income — better to wait for a higher-income year7. When to Make and When to Skip the ElectionMake it when:Buying the building with a long-term operating planHigh practice income and a cost seg study ready to deployNo near-term plans to sell, partner, or transition ownershipSkip or defer when:Income is low, preserve deductions for a higher-bracket yearYou own other passive real estate and need building losses to stay passiveA DSO transaction or partnership is within the next few years