1031 Exchange Cost Basis Explained

Why Cost Basis Matters After a 1031 Exchange

When you complete a 1031 exchange, you defer the tax on your gain. But the deferred gain does not disappear -- it is embedded in the cost basis of your replacement property. Understanding how your basis carries over is essential for calculating your future depreciation deductions, planning your next exchange, and understanding your eventual tax liability.

Many investors are surprised to learn that after a 1031 exchange, their cost basis in the replacement property is not the purchase price they paid. It is a lower number, calculated by carrying forward the adjusted basis from the relinquished property.

How Carryover Basis Is Calculated

The starting point is your adjusted basis in the relinquished property at the time of the exchange. The adjusted basis is your original purchase price, plus capital improvements, minus accumulated depreciation. This is the number that carries forward.

If you paid additional cash (boot) to acquire the replacement property, that additional cash increases your basis in the replacement property. If you received cash boot (taxable proceeds), your basis is reduced accordingly.

For example: you purchased a rental property for $300,000 ten years ago. You made $50,000 in capital improvements and took $100,000 in depreciation. Your adjusted basis is $250,000 ($300,000 + $50,000 - $100,000). You exchange into a replacement property worth $700,000, paying $200,000 in additional cash. Your basis in the replacement property is $450,000 ($250,000 carryover basis + $200,000 additional cash paid). This is significantly less than the $700,000 purchase price.

How Depreciation Works After the Exchange

Because your basis in the replacement property is lower than the purchase price, your annual depreciation deductions will also be lower than if you had purchased the property outright. The IRS requires you to use the carryover basis for depreciation purposes, not the full purchase price.

The depreciation is calculated in two layers. The first layer is the carryover basis, which is depreciated over the remaining useful life of the original property. The second layer is the "excess basis" -- the additional cash you paid -- which starts a new 27.5-year (residential) or 39-year (commercial) depreciation schedule.

Your CPA should prepare a detailed depreciation schedule after the exchange closes, showing both layers and the annual deduction for each.

The Step-Up in Basis at Death

One of the most powerful long-term strategies involving 1031 exchanges is the combination of indefinite deferral with the step-up in basis at death. When you die, your heirs receive a stepped-up basis equal to the fair market value of the property at the date of your death. The deferred gain and accumulated depreciation recapture are eliminated entirely.

This means that if you continue exchanging throughout your lifetime and pass the property to your heirs, the deferred tax liability that has been building for decades is wiped out. Your heirs can sell the property immediately after inheriting it and owe no capital gains tax.

Basis Tracking Is Your Responsibility

The IRS does not track your basis for you. It is your responsibility, working with your CPA, to maintain accurate records of your original purchase price, capital improvements, depreciation taken, and exchange history. After each exchange, your CPA should update your basis records to reflect the carryover basis and any additional amounts paid.

Losing track of your basis can result in significant errors on your tax return, either overpaying taxes by understating your basis or underpaying taxes by overstating it. Accurate records are essential.

Free Consultation

Understanding your basis and its implications for future exchanges is part of the comprehensive guidance 1031 Federal Exchange provides. Attorney Steve Wolterman, CES works with your CPA to ensure your exchange is properly structured and documented. Call 513-586-6879 or fill out our contact form.