Print to PDF should work on any printer. I don't know if you're using a tax program, but many (most?) do have an option to create a PDF. You could then sneakernet the file to the computer with the printer.
On VL 5.9 I have cups-pdf installed, which has worked well. I don't know how or if it works with RC3. Or print to a PostScript file and use the ps2pdf or pstopdf utility.
To print to file in Windows you need to have the printer driver installed for the printer on which you'll print the file. You don't need the actual printer, just the driver. The port would be "File."
I don't see "File" as a device in CUPS, but I imagine you could select LPR/LPD and set up a dummy address for the printer and install the CUPS driver for the target printer. Then print to file in your application.
If this works, let us know.