Obamacare’s ‘Cool Calculator,’ Part 2: The ‘Wedding Tax’ Link: When combined with Uncle Sam’s current income and payroll tax regimes, the gradual expiration as income increases of Obamacare’s “tax credits” will raise the portion of income taken by the government for each additional dollar of earnings to between one-third and one-half, effectively taxing most American workers at marginal rates usually limited to the planet’s highest income earners.