With Monday’s deadline for filing tax returns looming, let’s start a national conversation: How much is the most anyone should have to pay? When do taxes indisputably start to harm the economy and produce less revenue—when government takes 50% of people’s income? 60%? 70%?

I like half, but the principle matters more than the number. Once the country settles on a number, each of us gets to add up everything we pay to government at every level: federal income taxes, yes, but also payroll (Social Security, Medicare, etc.) taxes, state, city and county taxes, estate taxes, property taxes, sales taxes, payroll taxes and unemployment insurance for nannies, household workers, or other employees, excise taxes, real-estate transfer taxes, and so on and on, right down to your vehicle stickers and those annoying extra taxes on your airline tickets.

On April 15, once this total hits the alternative maximum tax, you’ve done your bit and federal income taxes can take no more. You compute federal income taxes as usual, but then you get to reduce the “tax due” that the total is less than the alternative maximum.

The zombies howl that the top federal tax bracket is still “only” 40%. Surely “the rich” can contribute a bit more? They forget that the economic damage of taxes comes from the total tax bite, not just the federal income tax.