PORTAX is a 64 bit Windows desktop application that primarily assists investors and financial advisors with medium and long term strategic taxable portfolio analysis.  This includes asset allocation, asset location with multiple tax entities, cash management and tax planning.  PORTAX also has the ability to plan investment funding for corporate projects and solve taxable and non-taxable institutional spending requirements.  PORTAX can do all the above analysis in any stable international currency and includes preset tax tables for over 50 countries including states, provinces and selected municipalities.

PORTAX was developed in 1994 as an in-house proprietary software tool to assist high net worth investors with low cost basis investments and assist utilities with funding for planned decommissioning of nuclear power plants.  These two diverse tasks both require multi-period analysis with detailed tax considerations.  Over the years, different clients requested direct access to PORTAX and the project gradually became a commercial software package for tax sensitive investors and financial advisors.

The original focus and continued development for PORTAX is on the financial engine.  The software is open architecture with extensive documentation including citations for various technical procedures used in the software.  Open architecture means that a PORTAX user has control of all the inputs to the model and access to all the formulas used in the output with the exception of some heuristics used in the optimizer.  One of the design goals is to make the PORTAX calculations as comprehensible and verifiable as possible. 

Investing in a taxable environment over a multi-year and in some cases multi-generational horizon can involve complex issues.  The next section on Taxable Investing is a brief overview that is helpful background for understanding the design and purpose of the PORTAX software.
























PORTAX Highlights January 2024
New release Version 9.7

Monte Carlo Histogram Charts

The Monte Carlo simulator now has Histogram
Charts for all assets and periods including
sample tests for Normality and Lognormality.

PORTAX Multi-period, After-Tax Optimization

Below are a series of International Maps
highlighting major tax jurisdictions.  The actual PORTAX
International Tax Tables also include additional tax jurisdictions.
2023 USA Combined Federal and State Tax Rates

2023 Canada Combined Federal and Province Tax Rates

2023 Europe Combined Tax Rates

2023 Asia Oceania Tax Rates

Click on images to enlarge ...