Rent the Runway, Inc. Files S-1: RSU & Capital Gains Tax Exposure Calculator (Sep 11, 2026)

What Changed

Rent the Runway filed an S-1 registration statement on September 11, 2026, signaling a return to public markets after operating as a private entity. The filing does not yet disclose pricing, but secondary shares held by early employees and executives are likely to become tradable within 180 days post-IPO. For current equity holders with unvested RSUs or exercised options, this filing starts the clock on liquidity and tax planning.

The Numbers That Matter

| Metric | Pre-IPO (Private) | Post-IPO (Public) | Net Tax Impact on $1M Position | |--------|-------------------|-------------------|-------------------------------|| | Liquidity timeline | No market | 180-day lockup, then tradable | n/a | | Long-term capital gains eligibility | Shares held over 1 year | Same, but clock resets at exercise for ISOs | 20% LTCG vs 37% + 3.8% NIIT for short-term | | AMT exposure (ISOs) | Triggered at exercise | No additional AMT at sale if holding period met | $280K potential AMT on $1M spread | | Estimated post-tax proceeds (LTCG) | $762K after federal on $1M gain | Same if holding period satisfied | $0 difference if planned correctly |

The core decision point is not whether to sell, but when the holding period clock started and whether AMT was paid at exercise. A $1M ISO position exercised 13 months ago qualifies for long-term treatment. The same position exercised 11 months ago does not. That two-month difference costs $132K in federal tax on a $1M gain.

What This Means for Your Portfolio

If you hold $500K in vested Rent the Runway equity and exercised ISOs more than 12 months before the IPO lockup expires, your net proceeds after federal tax are approximately $381K. If you exercised within the last 12 months, the same position nets $309K. The $72K gap comes entirely from short-term versus long-term capital gains treatment. For a $2M position, that gap scales to $288K.

The filing itself does not create a taxable event. The taxable event occurs at exercise for ISOs or at vest for RSUs. What the S-1 does is compress your decision window. You now have 180 days from the IPO effective date to finalize whether to hold for long-term treatment or sell into liquidity and accept short-term rates.

Scenario Analysis

Position Size	Holding Period Met (LTCG, 20% + 3.8% NIIT = 23.8%)	Holding Period Not Met (STCG, 37% + 3.8% NIIT = 40.8%)	Tax Difference
$500K gain	$381K net	$309K net	$72K
$1M gain	$762K net	$618K net	$144K
$2M gain	$1.524M net	$1.236M net	$288K

This table assumes top federal bracket (37% ordinary income, 20% LTCG), 3.8% NIIT, and no state tax. California residents add 13.3% on all figures. A $1M gain in California nets $628K under LTCG and $462K under STCG. The difference becomes $166K instead of $144K.

For ISO holders who paid AMT at exercise, that AMT generates a credit recoverable in future years when regular tax exceeds AMT. If you paid $200K in AMT on a $1M ISO spread in 2024, you can apply that credit against your 2026 or 2027 ordinary income tax liability, assuming you trigger regular tax in excess of AMT in those years. The credit does not reduce capital gains tax directly, but it reduces your overall tax burden in the year of sale if structured correctly.

Why This Filing Matters Now

Most employees assume liquidity solves the tax problem. It does not. Liquidity without a holding period strategy converts a 23.8% tax event into a 40.8% tax event. The S-1 filing is the forcing function. It tells you the IPO is 60 to 90 days out, which means your lockup expires 240 to 270 days from today.

If your ISOs were exercised in Q3 2025, you clear the one-year mark in Q3 2026, which is before the lockup expires. You sell at long-term rates. If you exercised in Q1 2026, you do not clear the one-year mark until Q1 2027, which is after lockup. You either sell early at short-term rates or hold an additional 90 to 120 days post-lockup to preserve long-term treatment. That decision has a $144K cost on a $1M position.

The other variable is concentration risk. A $2M Rent the Runway position represents 40% of a $5M portfolio. Holding an additional 120 days to save $288K in taxes exposes you to a 15% drawdown risk if the stock trades down post-lockup. A 15% loss on $2M is $300K, which erases the tax savings. The holding period math only works if you believe the stock holds or appreciates through your extended lockup window.

Frequently Asked Questions

Q: Does the S-1 filing trigger a taxable event for RSU holders? A: No. RSUs are taxed at vest, not at filing or IPO. The S-1 only starts the liquidity clock.

Q: If I exercised ISOs 11 months ago, can I wait until month 13 to sell and qualify for long-term treatment? A: Yes, but only if the lockup period has expired and the stock is tradable. Lockup typically runs 180 days post-IPO, so your one-year mark must fall after that window closes.

Q: How much AMT credit can I recover in the year I sell my ISO shares? A: You recover AMT credit up to the amount by which your regular tax exceeds AMT in the year of sale. On a $1M ISO sale, if you paid $200K AMT at exercise, you can recover the full $200K if your regular tax liability exceeds AMT by at least that amount in 2026 or 2027.

Q: Should I sell immediately at lockup expiration or wait for long-term treatment? A: If waiting costs you $144K per $1M in additional tax and exposes you to 120 days of single-stock risk, the decision depends on your concentration tolerance and your view on post-IPO price stability. There is no universal answer. Run both scenarios with your actual position size and tax rate.

Run the Numbers

Use CalcMoney's After-Tax RSU Proceeds Calculator to model your exact ISO or RSU position under current tax rates and holding period assumptions.

Disclaimer: This article is for informational purposes only and does not constitute professional financial, tax, or legal advice. Consult a qualified tax advisor or financial professional before making decisions regarding your equity compensation or securities holdings.

Run the Numbers: Capital Gains Tax Terminal on CalcMoney — see your exact figures under current market conditions.

Data sourced from SEC EDGAR S-1 Filings (IPO). Rates and thresholds are for informational purposes only. Consult a licensed financial advisor before making mortgage, investment, or tax decisions.

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