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<p>No they aren’t. You aren’t paying a dime in extra taxes based on that income. You just may lose eligibility for a tax credit. But that’s not any different than anything else in the tax system. For example, I can write off the cost of state property taxes I pay, but if my income was high enough to trigger AMT, I’d lose that deduction. </p>
<p>All tax exemptions and differential treatment of tax rates is based on policy goals to encourage certain types of investment. Muni bond interest isn’t taxed to encourage investors to buy government bonds, as opposed to say, corporate bonds. The federal government is going to reward you if you invest your money in a way that serves a common purpose with paying taxes: that is, to help finance local governments. </p>
<p>Similarly, they tax capital gains and dividends on long-term investments at a favorable rate, or even 0 rate for lower income individuals, because they want to encourage and reward people for holding on to their investments over time. </p>
<p>You still get the tax break always had on municipal bonds or any other tax-free investment. They only extra taxes you pay under ACA is the penalty you incur for not having insurance. </p>
<p>Whether you choose to buy insurance on the exchange (eligible for subsidies), or on the open market (not eligible for subsidies) - is up to you. The subsidies are to ensure that affordability is not a barrier to purchasing insurance. The fact the municipal bond income is exempt from taxation does not mean that it doesn’t exist. </p>
<p>In other words, the government has given you one tax break already on actual income by not taxing it. If you want the same income to be disregarded in calculating your eligibility for a government benefit, that is asking for a double tax benefit – not only do you want your tax-free income to be disregarded for tax purposes, but you also are asking for the total amount to be subtracted out from a needs test. </p>
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<p>They won’t be added back in because they are not “income.” They are not income because you did not get a deduction when you deposited the money – you are just withdrawing from a bank account you own, so it is no more “income” than going to the bank and withdrawing from savings would be “income.”</p>