I have made adjustments to the MBS mega formula that calculates the price of a mortgage-backed security. It now allows for default rates (CDR) and loss severity. In the past I have made other adjustments and I have included a review of these adjustments in the spreadsheet linked below. I’m not sure who will use this […]

# Author: Don Pistulka

## Tax Equivalents

In 2014 I wrote a post and Excel workbook called Tax Calculators, in which I described some of the calculations I had run across during my career. One of the sheets was a taxable equivalent sheet. The sheet was full of tables describing various equations for different equivalent rates. The sheet was bloated and even I had trouble […]

## Average Life VBA Function For MBS

This is the fourth in a series of VBA, User Defined Functions for Mortgage Backed Securities (MBS). The other three are, solve for price given yield , yield given price and Macaulay Duration . Actually the seventh UDF, if you include the functions solving for the market value of Servicing, IO, and PO). As was true of the previous three functions, it allows […]

## Macaulay Duration VBA Function For MBS (or single loans), Given Market Yield

This is the third in a series of VBA, User Defined Functions for Mortgage Backed Securities. The other two solved for price given yield and yield given price. Actually the sixth if you include the functions solving for the market value of servicing, IO, and PO). As was true of the previous two functions, it allows for […]

## Market Yield VBA Function For MBS (or single loans), Given Price

If this post looks familiar, it is supposed . My last post was “Market Price VBA Function For MBS (or single loans), Given Yield“. This Excel spreadsheet is almost the same function, except that this function solves for yield given price rather than price given yield. The main difference in the two functions is that yield can’t be solved directly through […]

## Market Price VBA Function For MBS (or single loans), Given Yield

I now also have another function to calculate yield given price see: Market Yield VBA Function For MBS (or single loans), Given Price Many of my previous posts and Excel spreadsheets have included amortization schedules that can calculate the price of MBS pools or single loans, given a discount rate (market yield). This spreadsheet includes […]

## Loan Pool Named Formulas, Without An Amortization Schedule

In a recent post I showed math formulas for a pool of mortgages that could calculate any amount, for any month, without an amortization schedule. This post and spreadsheet takes these formulas one step further and creates names for the formulas. After entering a description of the loan pool: Enter the month, in the future, that […]

## Market Value Functions for Servicing (MSR), Interest (IO), & Principal (PO)

Last year I posted an Excel workbook with a user defined function that calculated the market value of Mortgage Servicing Rights (MSR). I have taken the same workbook and added two more functions. These two functions are the market values of interest only (IO) and principal only (PO) on a mortgage loan. I am including the function […]

## When Cash Flows Don’t Match Compounding Periods

In a previous post Simple Formula for Converting Compound Interest Rates and spreadsheet, I showed a conversion formula that allowed the user to convert an interest rate from one compounding period to another equivalent compounding period. For example, you could calculate the annual equivalent for a monthly compound rate, or the semiannual equivalent rate of a quarterly compound rate, […]

## Variable Rate Amortization – Day/Year Count & Last Payment Options

Remember to enter dates and rates in yellow cells only. The worksheet is protected, except for the yellow input cells, so you are not tempted to type over a formula. There is no password, so you can unprotect the sheet. Back in November of 2014 I posted “Amortization Schedule With Variable Rates“, and an Excel […]

## Solve for return needed for one more period to equal a required APY

Back on September 8, 2015 I had a post call Chained Returns with an Excel spreadsheet. It was a calculator for chaining together periodic rates of return and calculating the annual yield (APY) and the periodic equivalent rate of return (APR). The data inputs (yellow cells) looked like this: After you entered the periods (fractions […]

## Monte Carlo Yield Curve Forecasting

This is a stochastic tool that uses forecasts of what the Treasury yield curve will look like in six months, and generates holding period returns (total returns) at various points out the curve. The results are based entirely on the users best-guess estimates of the shape of future yield curves. This kind of analysis can be helpful in a number of […]

## 24 Time Value of Money Calculations in One Excel Workbook

I thought I would consolidate some of the past posts and spreadsheets into one workbook. It could come in handy when you need some quick answers, or just to check your calculations. I tried to give not only the Excel functions, but the math and alternative calculations. In addition, I included the option to calculate the […]

## 3 -Ways to Bootstrap Spot Rates for the Treasury Yield Curve

Note: I have added a fourth method of calculating spot rates for the Treasury yield curve. The workbook is the same. For a brief explanation of the forth method: http://pistulka.com/Other/?p=2812 I have used what I am calling the “spreadsheet method” of bootstrapping spot rate from the U.S. Treasury yield curve in two pervious posts. […]

## 4-Factor Prepayment Model

In previous posts, I have covered CPR, PSA, and a spreadsheet that allows for any prepayment vector you might want to create. There have been many attempts to describe what the prepayment pattern for MBS will look like in the future. One of the models that has been used extensively, particularly with ALM (Asset / Liability […]