A report on Tax rate, Tax and Proportional tax

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Total revenue from direct and indirect taxes given as share of GDP in 2017
Pieter Brueghel the Younger, The tax collector's office, 1640
Substitution effect and income effect with a taxation on y good.
Budget's constraint shift after an introduction of a lump sum tax or a general tax on consumption or a proportional income tax.
The Laffer curve. In this case, the critical point is at a tax rate of 70%. Revenue increases until this peak, then it starts decreasing.
General government revenue, in % of GDP, from social contributions. For this data, the variance of GDP per capita with purchasing power parity (PPP) is explained in 20% by social contributions revenue.
Egyptian peasants seized for non-payment of taxes. (Pyramid Age)
Public finance revenue from taxes in % of GDP. For this data, the variance of GDP per capita with purchasing power parity (PPP) is explained in 32% by tax revenue.
Diagram illustrating deadweight costs of taxes

In a tax system, the tax rate is the ratio (usually expressed as a percentage) at which a business or person is taxed.

- Tax rate

A proportional tax is a tax imposed so that the tax rate is fixed, with no change as the taxable base amount increases or decreases.

- Proportional tax

In a proportional tax, the tax rate is fixed and the average tax rate equals this tax rate.

- Tax rate

A progressive tax is a tax imposed so that the effective tax rate increases as the amount to which the rate is applied increases.

- Tax

In between is a proportional tax, where the effective tax rate is fixed, while the amount to which the rate is applied increases.

- Tax
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1 related topic with Alpha

Overall

Flat tax

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A flat tax (short for flat-rate tax) is a tax with a single rate on the taxable amount, after accounting for any deductions or exemptions from the tax base.

It is not necessarily a fully proportional tax.