Re: 22 and a RN...what will taxes be like?
Poor Baby - welcome to adulthood!
As a single person, you will see about a third of your income disappear into taxes

. Of course, it varies depending on local & state tax rates. If you can afford it - go ahead and go with 0 dependents. Think of it as a 'forced' savings account. You can stash away your refund at the end of the year & build up a nice nest egg.
Look into other ways to lessen your tax burden - like contributing to your retirement plan. If you have a 30% tax rate - every dollar you shift into your 401k will only have a .70 impact on your take-home pay because these are 'pre-tax' deductions. Be sure you itemize your return so that you can deduct any interest on your student loans! If you decide to go on for a graduate degree, those costs will be mostly deductible also.
Lastly - seriously consider buying your own house/condo. Just about all of your mortgage payment will be deductible for the first few years.
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