Capital Gains Planning Before You Sell a Concentrated Position

The best time to understand the tax impact of a large stock sale is before the trade is placed.

Confirm cost basis and available tax lots

Review transferred shares, reinvested dividends, stock splits, inherited assets, and employee compensation records before assuming the brokerage statement is complete.

Short-term and long-term gains differ

Shares held for one year or less generally produce short-term gains taxed at ordinary income rates. Longer-held shares may qualify for long-term capital gain rates.

Estimate the complete tax effect

A sale may affect federal and state tax, net investment income tax, estimated payments, deductions, credits, and other income-based thresholds.

Do not spend all sale proceeds until the expected tax and payment dates are clear.

Coordinate the sale with the rest of the year

• Review realized losses and harvesting opportunities.
• Consider charitable giving before selling appreciated shares.
• Model sales across multiple tax years when practical.
• Coordinate tax, investment, and estate planning advice.