My husband bought a set of Color Sharp Pocket Highlighters specifically for the big event of Tax Preparation: as he worked through the bank statements, he highlighted different types of expenses in different colors, which turned out to be very helpful. These highlighters, or markers, as I call them, had served the purpose very well.
The set of five contains standard colors: pink, green, yellow, blue, and orange. The markers have traditional chisel tips that work so well when you need to highlight text, creating very neat lines. The colors are rich and bright, but the ink does not go all the way through to the back side of the page, even if you highlight in a newspaper. They also dry very quickly, so you don't have to worry about smearing. The markers are non-toxic.
The tax day is over, but I am sure these highlighters will find lots of use in our home office.