Cost basis and wash sale calculator

Calculating cost basis for stocks and mutual funds can be extremely tedious and time-consuming-with a high risk of errors. Yet mistakes can be extremely costly.

Calculate accurate basis-in seconds

With BasisPro you can calculate complete cost basis of any U.S. stock or mutual fund. You can also research and analyze complex corporate actions, such as stock splits, spin-offs, and mergers, as far back as 1950 and DRIP estimates for all cash dividends dating back to 1973.

BasisPro is a web-based application. You simply enter trades or import transactions. BasisPro then automatically applies corporate actions affecting the original trade lots to determine the shares and cost basis on the specific holding dates. This information is calculated and displayed within seconds, and results can then be exported.

With BasisPro, you can analyze entire portfolios at once and produce detailed customized reports for your clients.

Already supporting numerous accountants, operations departments and customer support groups at leading financial services firms, BasisPro offers an efficient way to meet the cost basis law transfer reporting requirements when basis is not provided. BasisPro can also be used to fill missing basis gaps for year-end 1099 reporting.

Quick and accurate access to basis information

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U.S. equities and mutual funds

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Historical calculations back to 1950

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Price and DRP estimates back to 1973

BasisPro Inheritance-automated stepped up basis batch processing

BasisPro can also be used as a is a fully automated fixed income batch processing service to calculate, track & report fixed income inheritance basis and accrued interest calculations for most fixed income securities.
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BasisPro is ideal for:

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Retail brokerage firms
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Full-service brokerage firms and advisers
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Fund management
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CPAs
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Registered investment advisers (RIA)
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Back offices
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Tax preparers

Frequently asked questions

  • Q1. What is BasisPro®?
    BasisPro® is a cost basis and taxability management solution that helps financial institutions automate cost basis and wash sale calculations across investment portfolios. Using GainsKeeper® technology and expert maintained corporate actions content, BasisPro® supports accurate tax treatment of securities transactions and corporate actions while reducing operational risk and manual calculation errors.
  • Q2. What calculations does BasisPro® automate?
    BasisPro® automates cost basis calculations, wash sale identification, and corporate action adjustments that affect tax reporting. These automated calculations help institutions manage transaction complexity across portfolios while improving consistency and accuracy in downstream tax reporting processes.
  • Q3. How does BasisPro® support corporate actions taxability?
    BasisPro® applies structured taxability logic and expert maintained content to determine the appropriate tax treatment of corporate actions, including capital changes. This helps institutions support accurate reporting and manage the tax impact of events that affect securities positions.
  • Q4. What types of tax reporting and analytical capabilities are included?
    The solution supports portfolio level analysis and provides exportable tax reports that feed downstream systems and tax reporting workflows, including support for Form 1099 B preparation.
  • Q5. Who typically uses BasisPro®?
    Directors of tax, tax managers, compliance managers, financial analysts, and operations teams use BasisPro® to support accurate cost basis and tax reporting processes at scale.

Product Sheet

BasisPro™
Download the Product Sheet
With BasisPro you can calculate complete cost basis of any stock or mutual fund. It’s simple, fast and accurate.

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