Cost Basis Calculator
Single Purchase
Multiple Purchases (Average Cost)
Formula
Cost Basis = (Purchase Price × Quantity) + Commissions; Average Cost = Total Cost Basis / Total Shares
Frequently Asked Questions
What is cost basis?
Cost basis is the original value of an asset for tax purposes, typically the purchase price plus any commissions or fees. It is used to calculate capital gains or losses when you sell.
What is the average cost method?
The average cost method calculates cost basis by dividing the total cost of all shares purchased by the total number of shares. This is commonly used for mutual funds and is simpler than tracking individual lots.
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