Carryover Basis vs. Excess Basis: Why Your 1031 Replacement Property Needs Two Depreciation Schedules
One of the most common errors on tax returns involving 1031 exchanges is treating the replacement property's basis as a single number with a single depreciation schedule. It's not. When the replacement property costs more than the relinquished property was worth, the basis has two distinct components — and the IRS expects them to be depreciated separately.
Understanding this distinction matters for your depreciation deductions, your tax planning, and your exposure on audit.
The Two Components of Replacement Property Basis
1. Carryover Basis
When you complete a 1031 exchange, the adjusted basis from your relinquished property "carries over" to the replacement property. This is the mechanism that embeds the deferred gain into the new property.
Formula:
- Adjusted basis of relinquished property
- \+ Recognized gain (if any boot received)
- \- Boot received (cash, debt relief)
- \= Carryover basis
The critical point: the carryover basis continues on the remaining depreciation schedule of the relinquished property. If your old property was 10 years into a 27.5-year residential schedule, the carryover basis continues depreciating over the remaining 17.5 years — it does NOT restart at 27.5 or 39 years.
2. Excess Basis
The "excess basis" is the amount by which the replacement property's purchase price exceeds the net value of the relinquished property (its fair market value less selling costs). This represents the new investment — the additional cash or mortgage the exchanger put in beyond the exchange proceeds.
Formula:
- Purchase price of replacement property
- \- Net value of relinquished property (FMV less selling costs)
- \= Excess basis (new investment)
The excess basis — and only the excess basis — gets a brand new depreciation schedule: 27.5 years for residential rental property or 39 years for commercial property, starting from the date the replacement property is placed in service.
A Practical Example
The Setup: - Sarah sells a rental duplex for $500,000. Her original cost was $280,000, she's taken $80,000 in depreciation, so her adjusted basis is $200,000. She was 12 years into a 27.5-year depreciation schedule. - She acquires a replacement fourplex for $650,000 through a fully tax-deferred 1031 exchange (no boot).
The Two Basis Components:
- Carryover basis — $200,000 — Continues on the remaining 15.5 years of the old schedule
- Excess basis ($650K − $500K) — $150,000 — New 27.5-year schedule starting at acquisition
- Total basis — $350,000
Sarah's total basis in the replacement property is $350,000 — not the $650,000 she paid. The $300,000 difference is her deferred gain (including $80,000 of depreciation recapture), which remains embedded in the lower basis until she eventually sells without exchanging.
Why Getting This Wrong Matters
The Common Error
Many tax preparers set up a single depreciation schedule for the replacement property at the total basis ($350,000 in Sarah's case) over a new 27.5 or 39-year life. This produces the wrong depreciation deduction in virtually every year.
The Impact
- Early years: The carryover portion may generate larger annual depreciation deductions than a fresh schedule because it's further along its recovery period (smaller remaining life = larger annual deduction per dollar of basis). A single schedule at the total basis would understate deductions.
- Later years: Once the carryover portion is fully depreciated, only the excess basis remains — and now the single-schedule approach might overstate deductions.
- On audit: The IRS can recalculate your depreciation, disallow improper deductions, and assess interest and penalties. This is not a grey area — the regulations are clear that the two components must be tracked separately.
What About Equal-Value Exchanges?
If the replacement property costs exactly the same as the relinquished property's net value, there is no excess basis. The entire basis is carryover basis, continuing on the old depreciation schedule. No new schedule is created.
What About Partial Exchanges (Boot)?
When boot is received (cash taken out or debt relief), recognized gain increases the carryover basis by the amount of gain recognized. The excess basis calculation remains the same — it's still the difference between the replacement purchase price and the relinquished property's net value. Both components still get their respective depreciation treatment.
The Partnership Angle
This gets particularly important for partnerships that do 1031 exchanges. The two-component basis must be tracked at the entity level and properly allocated among partners. If the partnership has Section 704(c) allocations from prior contributions, the layering of carryover and excess basis can become quite complex.
For partnerships considering a 1031 exchange, we strongly recommend engaging both your CPA and a Qualified Intermediary early in the planning process.
Key Takeaways
- Two components, two schedules. Carryover basis continues the old depreciation schedule; excess basis starts a new one. Always.
- The excess basis is the new investment. It's the purchase price of the replacement property minus the net value of the relinquished property — representing the additional cash or mortgage beyond the exchange proceeds.
- Don't set up a single schedule. This is the #1 depreciation error on 1031 exchange returns.
- Track the deferred gain. The difference between the replacement property's purchase price and its total tax basis is the deferred gain, which will be recognized when the property is eventually sold without an exchange.
- Get it right from the start. Correcting depreciation errors in later years requires filing Form 3115 (Change in Accounting Method), which is cumbersome and draws attention.
Our Role
As your Qualified Intermediary, Olympic Exchange Accommodators handles the exchange structure, timing, and fund custody. We also provide the closing statements and exchange documentation your CPA needs to properly set up basis and depreciation on the replacement property.
If you or your CPA have questions about basis tracking on a completed or planned exchange, call me at 253.512.1031. We're happy to walk through the numbers.
Jeff Helsdon, CES® Certified Exchange Specialist since 2003
