Accessory Dwellings

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ADU breakeven calculator

You can use this calculator tool to figure out your likely breakeven number in years. Read more about the ADU breakeven calculator here.

To use the tool, simply enter your values for the cells highlighted in green and blue by double clicking on the cell. The bottom cell in yellow will show you your ‘Number of Years to Breakeven’.

For a full version of the tool where you can view (and modify) the core calculator assumptions, or, if you’re having problems with the version displayed below, you can download this MS Excel spreadsheet.

6 comments on “ADU breakeven calculator

  1. Pingback: Breaking Bad is over. It’s Time to Break Even. | Accessory Dwellings

  2. Pingback: Breaking Bad is over. It’s Time to Break Even. | Accessory Dwellings

  3. Alex T.
    May 16, 2014

    I downloaded this, but the worksheet appears to be password protected so I can’t enter my values. Any ideas? Thanks!

    • kolpeterson
      May 16, 2014

      Once you’ve downloaded the Excel spreadsheet, the password to unlock the spreadsheet is listed in Box C1. Let me know if that doesn’t work for you.

  4. Elizabeth Stepp
    June 27, 2015

    Hi, We went on the Spring ’15 ADU tour and loved it! Do you know of any CPAs based in Portland, OR that are to some degree ADU/Real Estate-savvy? I asked my real estate agent and she told me to ask here….My conundrum is whether or not to build an approx. 670SF detached ADU on a higher value double lot with house and oversized garage. We may sell (downsize) in 5+ years and ‘breaking even” is not the issue. The City of Portland will likely want business tax payment on the SALE of the property (business income gains) and I am trying to find out (that is get a rough idea) how that tax amount is determined. If it is based on the entire property value then that is something that needs to be considered. I think it would be fair if the tax were applied to that portion of the property used for the ADU, but I don’t know. Similar to an in-house business using an office in the house, for example. Any CPA suggestions would be greatly appreciated. I understand that it would NOT be a recommendation. Thank you!

  5. Eli Spevak
    June 29, 2015

    One local Portland CPA who might be able to help vet this issue is Leslie Yudin,
    Up Front Accounting Services Inc., (503) 287-6680 Office.

    But I suspect that getting input from an appraiser (or real estate professional with those skills) might be more important information to get. Tax implications matter, of course. But they’re likely to be relatively small potatoes compared with the fundamental economics of the project (ie. how much it costs to build vs. how much value it adds to the property).

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