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Let's say I earn 100K a year, steady. When I move into the 25% band after I hit $1.3m in lifetime earnings, do I have to pay back taxes on the rest of my incom

Let's say I earn 100K a year, steady. When I move into the 25% band after I hit $1.3m in lifetime earnings, do I have to pay back taxes on the rest of my income that I've been paying 10% on the whole time? If so, then I'm going to owe about 200,000 that year, which is more than my income. "smoothing" not the word I would use here. Or, do I just start to pay 25% going forward? If so, your plan amounts to a massive tax cut for young people and a massive tax increase for retirees. As a young person, I can live with that, but it's absolutely terrible public policy.

waqf 15y ago
25% going forward. When you introduce the system, of course, you have to give people credit for all their past income tax paid. Most people of working age will have overpaid and will get a windfall in the form of a huge one-off tax credit, which will compensate them for the higher tax they will pay later in their lives. If letting people hold onto their money early in life and give it to the government later is considered to be undesirable public policy, it would be possible to even out the tax by including tax deductions based on age. For example, when computing your lifetime taxable income, subtract a "lifetime personal exemption" of $4k times your age. This causes no problems other than that your annual tax bill could potentially be negative (if you earned less than $4k that year).