SUMMARY (if you dont want to read the long explanation):
Your contribution must come from EARNED INCOME. Investment income does NOT count as earned income.
Withdrawals are subject to INCOME TAX. Meaning: your withdrawals would just become part of your income. So add the withdrawals with your Earned Income to get Gross Income. Then youll calculate your Taxable Income, then Tax Liability just as you would now.
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FULL:
Hello,
I'm glad to hear that you've been already maximizing your contributions! Buy me a dinner when you turn 59.5, will you?
Anyhow, let me first point out an error. You can NOT contribute your earnings from investment into your IRA Traditional or even to IRA Roth. It MUST be from an actual work, it HAS to be EARNED INCOME. Here's a definition of earned income:" Earned income is income received for personal services rendered. Passive income, such as income from an investment, is not considered earned income for purposes of making an IRA contribution. (
http://www.harborfunds.com/ So, in order words, your first example of putting your INVESTMENT EARNINGS into your traditional account, doesn't work. BUT, you said you have 401k, meaning you do have a job. Which means you can put the money from work into your IRA account(s). But, give and take for math purposes, whether or not the money comes from your capital earning or your payroll, it wouldn't make a difference. Unless, you're earned income is less than the contribution. Then the maximum contribution possible will be your earned income.
And it does NOT matter (meaning the IRS doesnt care) if you put $200, $1000, $1200, $1, etc Just keep it below the contribution limit and your earned income.
Because withdrawals are subject to INCOME TAX, when you do decide to retire (Make sure its after 59.5!), your withdrawals from your IRA Traditional will just be part of your income. So, youll be filing your taxes and paying taxes just like as if the withdrawals were extra income.
So, in order to calculate how much tax youll pay, figure out your Earned Income from your work and then add the withdrawals from your IRA Traditional to get your Gross Income. From that, youll figure out your Adjusted Gross Income, then Taxable Income then Tax Liability.
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I hope I have answered both your questions. Let me know if you have further questions.
(If there are spelling or grammar mistakes, I do apologize, its 1am and I need my sleep!)
-James R. Daniel