CoStar Group (CSGP) RSU sell-vs-hold
Calculator · free · no signup · CSGPSell at vest or hold? Compare after-tax payout from selling CoStar Group RSUs at vest vs. holding through the LTCG cliff at 12 months.
Beta · invite-only · AlphaLatitude Inc. · Free Tools
Your vest
Tax inputs
Hold strategy
Best after-tax payout — at year 1 yr
$47,709
Sell + invest wins by $4,981 over Hold 1 yr.
Estimates only. Not financial advice.
Heads-up: under-withholding. Your employer withholds federal tax at the IRS supplemental rate (22.0% on this vest, ≈ $17,600). Your marginal federal rate on this vest is 32.7%, owing $26,171. Expect to settle the $8,571 gap at tax time.
The hidden purchase
Tax was paid at vest either way. Holding is mathematically equivalent to taking $44,509 in after-tax cash and buying $44,509 of CSGP today.
Most diversification frameworks would advise against a purchase that size in a single name; the right answer depends on your conviction in CSGP. Holding past one year converts the gain to LTCG.
Sell + invest
Best payout| Vest value (shares × price) | $80,000 |
| Federal | |
| State | |
| Medicare | −$1,160 |
| Additional Medicare | −$720 |
| Market gain over 1 yr at 10.0% | $4,451 |
| Cap-gain tax on diversified gain — LTCG (federal + state + NIIT) | −$1,251 |
| Net at year 1 yr | $47,709 |
Sell every share at vest; invest the after-tax cash at the market return for 1 yr, then liquidate. Diversified — no single-stock concentration risk.
Hold 1 yr
| Vest value (shares × price) | $80,000 |
| Vest tax (federal + state + FICA) | |
| Net at year 1 yr | $42,728 |
Sold 444 shares to cover vest tax (net-settled); kept 556 shares 1 yr to qualify for long-term capital gains.
Social Security + Medicare are payroll taxes (collectively called FICA) — they apply because you're still employed at vest.
Both columns are stated in year-1 yr dollars. The sell side compounds at the market return; the hold side compounds at your single-stock expected return after a 20% volatility drag.
Estimates only. Assumes net-settled (sell-to-cover) vesting; double-trigger and pre-IPO RSUs are out of scope. Excludes multi-state moves, AMT interactions on other equity, and 83(b) elections. Not financial advice.
You evaluated one RSU vest. The beta plans every vest of every grant across years, with concentration and AMT in the loop.
Request beta access →Related calculators: RSU Lot Order Calculator · Stock Concentration Calculator
About CoStar Group
CoStar Group (CSGP) is a public Data company, incorporated in Delaware and headquartered in Arlington, VA.
Last close: $31.38 per share (as of 2026-08-18).
Equity grants at CoStar Group typically include restricted stock units (RSUs).
CoStar Group, Inc. is an American provider of information, analytics, and marketing services to the commercial property industry in North America and Europe. Founded in 1987 by Andrew C. Florance and based in Arlington, Virginia, the company operates the CoStar online database and news website and several online marketplaces, including Apartments.com and Homes.com.
Source: Wikipedia (CC BY-SA 4.0)
Andrew Florance founded the company in 1987 to build a commercial real estate database, and its research staff physically verifies property and lease data that is otherwise scattered and private. That proprietary collection is the moat: subscriptions to CoStar Suite are close to mandatory for brokers and appraisers. Apartments.com and, more recently, Homes.com extended the model into residential listings, funded by very large marketing campaigns. Residential expansion is the expensive bet on an established data business. Headquarters are in Arlington, Virginia.
Sources: sec.gov · en.wikipedia.org
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by CoStar Group.
CoStar Group (CSGP) RSUs vest as ordinary income at the price on vest day. The decision is whether to sell at vest and reinvest, or hold the shares through the 12-month LTCG cliff. This calculator runs both paths through the same after-tax math so you can compare like-for-like.
Example: 500 CoStar Group (CSGP) RSUs vesting at $31.38 per share is $15,690 of ordinary income on vest day. After roughly 32% combined federal + state + FICA (~$5,021), the post-tax share value is ~$10,669. Holding 12 months for long-term capital-gains treatment then only matters for the price change between vest and sale; the ordinary income at vest is already locked in. The calculator runs both paths through the same after-tax math.
All CoStar Group tools → · Use the generic RSU Sell-vs-Hold Calculator for any company. Diversifying multiple RSU lots? See the lot-by-lot sell order →
CoStar Group equity questions
- Should I sell or hold my CoStar Group RSUs at vest?
- CoStar Group restricted stock units (RSUs) are taxed as ordinary income on their value at vest whether or not you sell. The only open decision is what to do with the shares afterward: sell at vest and reinvest, or hold past twelve months for long-term capital-gains treatment on any further gain. The calculator above runs both paths through the same after-tax math so you can compare them directly.
- Does CoStar Group grant ISOs, NSOs, or RSUs?
- Equity compensation at CoStar Group typically takes the form of restricted stock units (RSUs). Restricted stock units are taxed as ordinary income when they vest.
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