Maybe you could give us a bit more information. Possibly, what the tax code setup looks like (all screens), did you exclude any module, whether you used a tax code on the data entry screen, which module you are in (money in or out), did you use an amount in the Amount column or only the Price column, what you expected to see, what you do see? If you are only in purchases, did you make sure the tax code calculations indicate Yes for Refundable?

Hello - I went into Settings and Sales Tax. Under Taxes, I listed the tax and the GL it's assigned to. Under Tax Codes, I listed the codes and described them, including the percentage. I indicated they're to be used in all journals.
Going into the purchases module (money out), I enter an invoice, the amount, the tax code and when I tab over, the tax isn't being calculated or included in the total of the invoice.

Sorry but you are still not telling us what is necessary to help you because you didn't answer all the questions.  Did you enter $100 in the amount column and $100 shows in the Subtotal and Total boxes at the bottom?  If so, what makes you think the taxes are not calculated?  Did you look at the journal entry on the Report menu to see if the sales tax was there?  Is there anything in the Tax Amount column (or the HST or GST columns)

Bookend2 said:

Under Tax Codes, I listed the codes and described them, including the percentage.

I can do the same thing and describe it as "I hate having to pay this $45%" in the description column.  Sorry but that is just text you put in this dialog below correct?  It only shows you and potentially a customer what the tax code is, not that I am really charging 45 percent dollars (or is that dollar percents?).  Did you do what is highlighted in yellow by the red arrow and enter the actual calculation as in the second image below?  If not, this is likely your problem.  You have not yet entered the calculation for the tax code.  Sage 50 is very versatile in how it can calculate sales tax so it gives you control over how it should be done to match the various scenarios in various provincial/state and country jurisdictions.

Please note that this image above calculates HST at 13% but includes it in any dollar amount on the line.  I include it here because you said the amount you entered does not have tax calculated on it but if you did fill out this dialog in the Tax Code Details image above, then you could have indicated that it should be Included in Price.  This means if you enter $113 in the line Amount column and use this HI tax code in Purchases, you would post an expense for $100 and HST sales tax paid for $13.  You will not see $100 until you look at the journal entry on the Report menu before you post or one of the Reports from the Home Screen after you post.

I'm still guessing, but it is likely you have not completed the calculations of the tax code.

Hope this helps

That's it! I couldn't figure out where I needed to include the rates. You answered my question and I thank you so much!