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Chapter 3 of 9 · explanatory only · no rates, thresholds or deadlines

From tolls and tithes to income tax, withholding at source, value-added taxation and digital filing.

Tax systems change slowly for long stretches and then very quickly under pressure. Reading the history makes the modern arrangement much less mysterious: nearly every feature that looks arbitrary was a practical answer to a problem of measurement, administration or emergency finance.

3.1Taxing what could be seen

Early systems taxed things that were physically observable, because nothing else could be verified. A share of the harvest, a levy on a household, a toll at a bridge, a due on goods crossing a border, a tithe on production: each of these can be assessed by looking. Rulers taxed land, doors, windows, hearths and salt not because those were fair bases but because they could be counted by an official walking past. Where the base could be altered, it was: taxes assessed on visible features of buildings produced buildings with fewer of those features, which is the earliest well-documented lesson in behavioural response.

3.2Customs, excise and the choke point

As trade grew, the most productive places to collect were the choke points: ports, city gates and the premises of large-scale producers. Excise duties on drink, salt and other concentrated production survived because a small number of large producers are far easier to supervise than a large number of small consumers. The principle is still visible: modern systems collect wherever few parties handle large flows.

3.3The arrival of income tax

Charging people on their income requires a way of knowing what their income is, which requires widespread literacy, standardised money, banking records and an administration capable of handling returns from a large population. Those conditions arrived in the industrial era, and the trigger was almost always war. Income taxes were repeatedly introduced as emergency measures, repealed when the emergency passed, and reintroduced at the next one, until the reintroductions stopped being repealed.

Two things followed from that history. Income tax carried a wartime association for decades, and its structure was built for a small number of substantial taxpayers rather than for a whole population.

3.4Withholding at source

The change that turned income tax into a mass instrument was administrative rather than conceptual: deducting the tax from wages before the wages were paid. Withholding made the tax collectable from millions of people who had never filed anything, smoothed revenue across the year instead of concentrating it in one payment, and drastically reduced the number of people who could simply fail to pay.

It also changed the politics. A tax that never appears in a bank account is felt differently from one that must be handed over in a lump, and the design of every subsequent tax has had to reckon with that asymmetry of attention.

3.5The spread of value-added taxation

The mid-twentieth century produced the staged consumption tax described in Chapter 2, and it spread across the world faster than almost any other fiscal instrument in history. The attraction was that it raised large, stable revenue without needing to be levied at a punitive rate at any single point, and that its invoice trail gave administrations a self-documenting record of trade. Countries that adopted it typically reduced their reliance on cascading turnover taxes, which had penalised every extra stage of production and quietly encouraged firms to merge for tax reasons alone.

3.6Information, cross-border activity and digital filing

The most recent shift is about information rather than rates. Financial records are now reported between institutions and administrations rather than being assembled from scratch by each taxpayer; returns are filed electronically and increasingly pre-populated; and the hard cases have moved from concealment towards classification, where the facts are known but their treatment is arguable.

Cross-border activity drives much of the remaining difficulty. Where a company's costs, customers, staff and intellectual property sit in different places, the question of where profit arises has no self-evident answer, and the modern history of business taxation is largely a history of successive attempts to answer it.