Yeah, and from what I understand, it was a tax on revenue, not profit. If you harvested 10 carrots and had to give 3 or 8 carrots to your horses, you were still tithed 1 carrot.

Only the very wealthiest of land-cultivating peasants owned large animals at the time, though (and pretty much never horses). Also, you wouldn’t feed human edible vegetables to animals, that would be very wasteful.

More importantly, these income taxes were based on rather small fraction of revenues, since they were only based on agricultural production, and not on household production. Obviously, it was extremely impractical to tax household production, and it still is. Importantly though, back then, typical household consumed much more of its own production as a fraction of all consumption than today, and as a result, less of their real income was taxed.

Here is a way to think about it: if you buy a shirt from someone, you might need to pay the sales tax. However, if you make your own shirt, you aren’t going to pay tax on it. Today, you wouldn’t actually do it, because other people can make a shirt with much less effort than you ever could, so it’s still worth it for you to buy someone else’s product and pay the tax, because the productivity gains of trade will more than pay for what government skims from the transaction. However, back before industrial revolution, the differences in productivity weren’t nearly as big, so it didn’t alway make much sense to specialize in everything and trade.

We don’t tax household consumption today, either. If you grow veggies, cook, mend/sew your own clothes, wash your own clothes, change your own oil, mow your own lawn, 3D print your own stuff, or produce your own solar power, you’re not taxed on it (although that doesn’t stop some folk, whether utilities or whatever, from trying to effectively tax you on it). Of course, household production is massively less efficient for many things, although people are forced into becoming DIYers if tax rates are high, prices are artificially high (think rent-seeking behavior by monopolies like utilities), or if money is scarce (ie if there’s a recession/depression).

And my point about carrots was deliberately cartoonish. The point is that revenue, not profit, was taxed.

Fun fact: At least in Germany you often end up paying taxes on self-consumed solar. They calculate the tax based on what you would have payed your regular supplier (or 20c/kWh). But otoh you get to declare your "solar plant" a business, with some nice perks: If you buy the solar equipment for net 20k€ you'll pay 19% or 3.8k€ taxes. You get that money back. In addition, the 20k€ are a business expense and reduce your taxable income (there are two modes for this, either 5%/year for 20 years or a huge block [50%?] the first year and some smaller blocks the next two or three years - I believe). So if you pay 30% income tax, you'll save about 6k€. All other expenses related to the solar plant (service, repairs, insurance,...) also count as business expenses, with the same effect.

If you're not earning more than 17.5k€/a in addition to your regular income, you can opt to forfeit the whole stuff in favor of the "Kleinunternehmerregelung" (small business provisions), but then you don't get the above business perks. Though after a few years you can change from a full business to a small business, so you'll have to do the math.

Sounds complicated? Welcome to Germany! :D

(Disclaimer: This might be not 100% accurate, so talk to your tax consultant if you're doing solar in Germany)

AFAIK this is only true if you pass the power you generate back to the grid - which most people did as it used to be heavily subsidized. If you run your solar without powering the grid, you won‘t be taxed on the used power.

The subsidies still exist. And while in absolute numbers they seem low, the reduced costs for solar modules still make them worthwhile.

If you don't feed into the grid as a normal person you're right (that's either "Kleinunternehmerregelung" or, if it's obviously not producing any profit, "Liebhaberei"). But if I built a fictive 500kWp solar plant to power my fictive compute center I would have to pay taxes on the self consumed power. Mind I'm a layman, so I might have gotten that wrong, but I'm 80% sure I got it right.

> Also, you wouldn’t feed human edible vegetables to animals, that would be very wasteful.

...yes, you would. What else could you feed them?

Animals get lower-quality stuff. Wheat for people and oats for horses. But it's not like people can't eat oats.

Grass. I believe oats and seed is fairly recent development. Historically, you had animals grazing by rotating pastures, or consuming dried grass (hay) when you couldn’t graze (eg winter).

Also interesting tidbit — apparently horses of modern sizes cannot eat grass fast enough to sustain their size. They require the higher calorie density of oats and such. Horses that get back into the wild apparently quickly revert to much smaller sizes with a couple generations (according to acoup.net, which I never verified further)

That assumes you have a lot of free pasture lying around. Odds are, the pasture is already in use, likely for sheep or cows.

All that's really necessary for the draft horse to wind up eating oats is that its economic contribution exceeds the value of the oats.

Yes, that’s why, as I said, no peasants owned draft horses before modern times, and very few land-cultivating ones owned any large animals at all.

I have the vague idea that in medieval Europe there would usually be one draft team which farmers would rent from whoever owned it. That supports the idea that owning draft animals was rare. But it doesn't so much support the idea that you wouldn't feed human-edible food to them.

Note that I said “human edible vegetables”, not “human edible food”, in context of a historical absurdity of a peasant feeding carrots to his horse. It’s as absurd as if 500 years from now, people on future equivalent of Hacker News claimed that in early 21st century, the poor complained about rising alcohol prices that they used to run their private jets on.

Now, I’m happy that your knowledge already allows you to infer that regular peasants did not, in fact, own draft animals, and I’m sad that it does not allow you to infer that the draft animals were not fed human edible food. Alas, that was the case: draft animals, which were universally oxen, would eat pasture grass, cut hay, and waste biomass like straw left over after growing grains. Human edible food was much too valuable to feed it to animals on a regular basis, and vegetables even more so, considering how little vegetables a typical peasant consumed himself (his diet was overwhelmingly grain based).