1031 Exchange Basis Calculator

New basis = old adjusted basis + boot − deferred gain. Section 1031 like-kind tax deferral.

Inputs

Cash or non-like-kind received. Triggers taxable gain.

Result

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General calculation reads

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How to use this calculator

  • Old basis = original cost + improvements − depreciation.
  • Old FMV = sale price.
  • New FMV = replacement property cost.
  • Boot = any cash received.

About this calculator

Section 1031 like-kind exchanges defer capital gains tax when swapping investment real estate. Key: deferred gain becomes new property's "carryover" basis (hidden tax liability). Boot = anything received that's not like-kind property (cash, debt relief, personal property) — recognized immediately as gain. Strict 45-day identification + 180-day closing windows. Major tool for real estate investors building portfolios. Source: IRC §1031; IRS Publication 544.

Frequently asked

Like-kind?+
For real estate: any investment real estate qualifies for any other investment real estate (TCJA 2017 limited to RE only).
45/180 day rules?+
Identify replacement within 45 days of sale; close within 180 days. Strict — no extensions.
Boot examples?+
Cash received, debt relief (old mortgage > new), personal property (furniture, equipment). Triggers immediate tax.
Carryover basis problem?+
New basis is artificially low → less depreciation, larger gain when eventually sold (or stepped up at death).
When is final tax due?+
When you sell without 1031-ing. Or never — heirs get stepped-up basis at death (no tax on deferred gain).

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