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Investment Return Monte Carlo Simulation Model

Model to calculate the expected value and return of an investment over an investment period using Monte Carlo simulation


Excel Model 


PDF Example


User-friendly Excel tool for calculating the financial impacts from refinancing up to 10 existing loan facilities with up to 10 new loan facilities in order to help the users make informed refinancing decisions.

The model follows best practice financial modelling principles and includes instructions, checks and input validations.


  • The key outputs include:

  • Distribution chart of investment balances at end of investment period;

  • Distribution chart of the total investment return over the investment period;

  • Key results/ratios including average investment balance, average investment return, average total additions/redemptions;

  • Table showing total investment balance, investment return and additions/redemptions across percentiles in intervals of 5%.


The key inputs include

  • Investment Name

  • Currency

  • Calculation Year

  • Balance at Start

  • Investment period in years

  • Additions/redemptions per annum

  • Average return per annum

  • Inflation rate

  • Standard deviation of return


The model contains, 5 tabs split into input ('i_'), calculation ('c_'), output ('o_’) and system tabs. The tabs to be populated by the user is the input tab ('i_Assumptions'). The calculation tab uses the user-defined inputs to calculate and produce the projection outputs which are presented in ‘o_Results’

System tabs include:

  • A 'Front Sheet' containing a disclaimer, instructions and contents;

  • A checks dashboard containing a summary of checks by tab.


  • The model follows best practice financial modelling guidelines and includes instructions, line item explanations, checks and input validations;

  • The model allows for a maximum remaining investment period of 100 years;

  • The model uses Monte Carlo analysis to simulate the investment return and balances for up to 1,000 iterations;

  • Investment Name, currency, calculation year are fully customisable;

  • The model includes instructions, line item explanations, checks and input validations to help ensure input fields are populated accurately;

  • The model includes a checks dashboard which summarises all the checks included in the various tabs making it easier to identify any errors.

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