Or over funds you saved by not needing to run to the store to purchase foods that you could grow yourself. Subsistence farming makes even more sense in a communist country, with an emphasis on producing for one's own consumption, which would not be taxable except for land taxes.
Which explains in a nutshell why the IMF is so eager to make loans to "underdeveloped" nations to bring them into the "modern" world: Subsistence farming traditionally employed by citizens of "non-aligned" nations (a UN term) frees the "poor" from being saddled with interest-bearing loans, industrial agriculture methods, over-development, and assimilation into global technocracy.