Math4Law Documentation

Present Value Calculators ​

Four calculators for determining the present value of future payments.

Stream of Payments ​

Calculate the present value of a future stream of payments, including pensions.

Enter the following information:

  • The periodic payment to be received, assuming no further contributions to the plan, and the frequency of payment.
  • The number of years and months over which these payments are to be received. Press the Calculate From Life Expectancy Table button to estimate the period from the person's life expectancy (see below).
  • The assumed investment interest rate per year.
  • The rate by which the periodic payment is expected to grow each year. Leave blank for no growth.
  • The number of years and months until these payments are to begin. Leave blank for no delay.
  • Whether the first payment is received at the beginning or the end of the period.
  • The probable federal and state tax rates on the monthly benefit. Leave blank if a tax calculation is not required.

The results show the Present Value, and, when tax rates are entered, the Net Payment, Federal Tax, and State Tax.

Life Expectancy Calculator ​

The Life Expectancy calculator estimates the payment period based on the 2020 US Census Bureau data. Enter the person's age or date of birth, the age at which payments begin, and the gender. The dialog shows the life expectancy, the time until payments begin, and the payments duration. Press Accept to use the calculated values.

Lump Sum ​

Calculate the present value of a future single payment.

Enter the amount of the lump sum to be paid, made, received, or needed in the future; the number of years and months until the payment; the assumed investment interest rate per year; and the compounding frequency.

Maintenance ​

Calculate the present value of a maintenance entitlement.

Enter the maintenance amount to be paid or received, the frequency of payment, the number of years and months over which the payments are to be received, the assumed investment interest rate per year, the number of years and months until the payments begin, the probable tax rates (optional), and the compounding frequency.

The results show the Present Value, the Taxed Present Value, the Net Payment, and the calculated taxes.

Monthly Payment From Lump Sum ​

Calculate the monthly payment that can be withdrawn from a lump sum.

Enter the amount of the lump sum, the number of years and months over which payments (withdrawals) from the fund are to be made, the assumed investment interest rate per year, and the compounding frequency.