I'm assuming taxes are paid by individual earners. Using tax policy to encourage (or discourage) marriage is (IMHO) stupid.

Let's see... GDP per capita is already higher than median income.

Assume
0% below 1/2 GDP
10% between .5x and 1 x GDP
20% between 1x and 2x GDP
40% between 2x and 4x GDP
60% between 4x and 8x GDP
80% between 8x and 16x GDP
90% above 32x GDP

Your upper-middle class professional making 200k would pay 86.25k which is only 43% - but the point is that someone making 100k and getting a 100k bonus would only pocket 40k of the bonus, and that 100k + 100k is already indecent, if you ask me. At the upper end of the 80% tax bracket (400k) they'd pay 52%.

When the capital development of a country becomes a by-product of the activities of a casino, the job is likely to be ill-done. — John M. Keynes