"Federal" income tax schedule not working in Excel

Renewable energy projects in El Salvador are tax-exempt for their first 10 years. I've entered a schedule for the Federal income tax rate, with 0's as the first ten values in the schedule, and 30 for the later 10 years.

When I run the simulation, I get $0.00 tax liability for the first ten years, and 30% for the later 10 years, as expected. But when I export the cash flow to Excel (with equations), I get $0.00 tax liability for all 20 years!

I discovered that the custom tax schedule is correctly exported to Excel, to the 'Inputs' sheet row labelled 'Federal income tax rate (%/year)'. However, in the 'Cash Flow' sheet, the calculated values labelled 'Federal Tax Benefit/(Liability)' all refer to the first year's tax rate (0%), instead of referring to the range of twenty values holding the tax schedule.

Hello,

Thank you for pointing out that problem with the Excel workbook. We will fix that in the next update.

In the meantime, you can fix your copy of SAM by editing the workbook in the SAM installation folder. The em>single_owner.xlsx[/i] file is in the folder C:\SAM\2017.1.17\runtime\spreadsheets.

When you click the Send to Excel with Equations button on the Cash Flow tab of the Results page, SAM opens a copy of that Excel file, and populates the input cells with values from SAM's input pages. You can modify the Excel file to make changes to or correct calculations. If you do that, be careful to close SAM while you edit the Excel file, and to close Excel before you start SAM. You may want to make a backup copy of the workbook before you make any changes.

Best regards,
Paul.