National Records of Scotland have released the Consolidated Tax Schedules for 1798-1799. These are available on the ScotlandsPlaces website.
From 1798 onwards taxpayers were no longer taxed individually for taxable items. Rather all of the taxes were consolidated into one payment.
Unfortunately, only the consolidated schedules counties which begin with the letters A-M survive. There are no schedules available for Nairnshire, Orkney, Peebles-shire, Perthshire, Renfrewshire, Ross-shire and Wigtownshire.
Here's the link: