While Excel and DAX have native functions to calculate the future value of a payment series, Power Query lacks it still. So it’s time to create our own function for the Future Value (FV) for Power Query:
Excel’s function for the Present Value (FV) for Power Query
Excel’s FV function returns the future value of an investment based on a constant interest rate. Like for the PV-function, I could use the calculation logic from Greg Deckler:
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| let func = | |
| (Rate as number, Nper as number, Pmt as number, optional Pv_ as number, optional Type_ as number) => | |
| let | |
| // Source for general algorithm: https://community.powerbi.com/t5/Community-Blog/F-G-Excel-to-DAX-Translation/ba-p/1061026 | |
| Type = if Type_ is null then 0 else Type_, | |
| Pv = if Pv_ = null then 0 else Pv_, | |
| FV = | |
| if Rate = 0 | |
| then -1 * ( (Pmt * Nper) + Pv) | |
| else -1 * ( | |
| ( Pv * Number.Power( 1 + Rate, Nper) ) + | |
| Pmt * ( 1 + Rate * Type) * | |
| (( Number.Power(1 + Rate, Nper) -1 ) / Rate ) ) | |
| in | |
| FV, | |
| documentation = [ | |
| Documentation.Name = " Xls.FV ", | |
| Documentation.Description = " Calculates the future value of an investment based on a constant interest rate ", | |
| Documentation.LongDescription = " Calculates the future value of an investment based on a constant interest rate. You can use FV with either periodic, constant payments, or a single lump sum payment. ", | |
| Documentation.Category = " Xls.Financial ", | |
| Documentation.Source = " www.TheBIcountant.com . ", | |
| Documentation.Version = " 1.0 ", | |
| Documentation.Author = " Imke Feldmann ", | |
| Documentation.Examples = {[Description = " ", | |
| Code = " let | |
| Rate = 0.06/12, | |
| nPer = 10, | |
| Pmt = -200, | |
| Pv = -500, | |
| Type = 1, | |
| FunctionCall = XlsFV(Rate, nPer, Pmt, Pv, Type) | |
| in | |
| FunctionCall ", | |
| Result = " 2581,40337406013 | |
| "]}] | |
| in | |
| Value.ReplaceType(func, Value.ReplaceMetadata(Value.Type(func), documentation)) |
Function Arguments
To keep it really convenient, the arguments for this function are identical with the Excel ones:
- Rate Required. The interest rate per period.
- Nper Required. The total number of payment periods in an annuity.
- Pmt Required. The payment made each period; it cannot change over the life of the annuity. Typically, pmt contains principal and interest but no other fees or taxes. If pmt is omitted, you must include the pv argument.
- Pv Optional. The present value, or the lump-sum amount that a series of future payments is worth right now. If pv is omitted, it is assumed to be 0 (zero), and you must include the pmt argument.
- Type Optional. The number 0 or 1 and indicates when payments are due. If type is omitted, it is assumed to be 0.
| Set type equal to | If payments are due |
|---|---|
| 0 | At the end of the period |
| 1 | At the beginning of the period |
Please check out the following video to see how to apply this function in your solution:
Enjoy and stay queryious 😉
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