A Cost Basis Calculator
You Can Trust

A Cost Basis Calculator
You Can Trust

For over 20 years, Netbasis has been the standard for cost basis calculations.

Fast and Accurate!

Netbasis can provide fast answers when you need to figure out your correct cost basis or capital gains tax amounts. We have your stock or mutual funds’ history of corporate actions, pricing and dividends going back as far as 1925.

Our cost basis calculator will quickly provide you with your adjusted cost basis even if you don’t have all of your investment information. All you have to do is enter the buy and sell information that you have.


Get Started!






What is Netbasis?


When you sell any shares and have to report it on your taxes, you have to calculate an adjusted cost basis. Which means that the price of the stock when you acquired it has to be adjusted for corporate actions, such as splits, spin-offs and mergers and dividends reinvested (if you participated) that occurred during the time you owned the stock. Our Netbasis cost basis calculator will easily provide you with your adjusted cost basis even if you don’t have all of your investment information or if you acquired your shares decades ago.

Why is using Netbasis important?


Netbasis has set the standard for cost basis calculations for over 20 years. We pride ourselves on our extensive and highly accurate historical data. Our application has even been utilized by the IRS in an audit study of investing taxpayers.

"What Information Do I Need To Start Using Netbasis?"


Netbasis has your security’s corporate actions (splits, mergers, spin-off, etc), pricing and dividend information. Netbasis requires only a minimum amount of information from you to calculate your cost basis. After identifying the original security you acquired, you just need to enter the following information:

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Share Dates

Enter the date(s) for shares you acquired (purchased, inherited or received in a spin-off). Then enter the date(s) for the shares you sold.

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Amount of Shares

Enter the number of shares for every acquisition. Then enter the number of shares for every sale.

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Dividend Dates

You don’t have to enter every dividend. Click “Yes” if you reinvested dividends for the entire holding period or enter the start or end dates.

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Take Netbasis for a Spin!


Come take a quick test drive! You can freely search securities along with their CUSIP, ticker, start and end date. In addition you can try out all the features in our Trade Activities UI. If you need a full comprehensive cost basis report, we help price options ranging from single report up to unlimited usage. Experience the future in cost basis reporting & analysis.


Built on 20 Years of Trust

Here are some of our shareholder clients:


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