Constructive Sale Calculator

Constructive sale rules trigger when you hedge an appreciated position too aggressively (typically 80%+ of gains locked in via short sale, futures, or options). the tax authority treats this as a sale even though you still hold the position - immediate tax due. Designed to prevent indefinite tax deferral on gains.

500,000 position with 100,000 cost basis = 400,000 unrealized gain. Hedge locking in 90% of gain = 360,000 locked. Triggers constructive sale. At 20% LTCG rate: 72,000 immediate tax due. Position still held but tax already paid - eliminates tax benefit of holding.

To avoid constructive sale: keep upside exposure (less than 80% gain locked), use partial hedges (50-70% protection still allows full deferral), use longer-dated options out-of-the-money (less constructive sale risk). For substantial appreciated positions, consult tax advisor before hedging - getting it wrong creates immediate tax on positions you still hold.

Quick example

With position value of 500,000 and cost basis of 100,000 (plus hedge locks in of 90% and long-term capital gains rate of 20%), the result is 72,000.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Position Value, Cost Basis, Hedge Locks In %, and Long-Term Capital Gains Rate %. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.

What's happening under the hood

Unrealized gain = position - basis. Locked gain = unrealized × hedge %. Tax = locked × LTCG rate. 80%+ hedge typically triggers. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

Why run this

Running the numbers makes the trade-offs concrete. Small changes in the inputs can move the result more than intuition suggests, which is hard to judge without working it out.

What this doesn't capture

This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.