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Traditional and Roth balances. Almost all TSP participants have a traditional balance. (That’s because all
agency/service contributions are traditional and because the Roth option wasn’t available until 2012. And
you cannot convert traditional into Roth.) If you’ve made Roth contributions, your account will also have a
Roth balance.
We have to keep these two pots of money separate so that we can treat the money dierently for tax
purposes as described earlier. When you take a loan from your account or do a fund transfer or reallocation,
the transaction will include a proportional amount from each balance (traditional and Roth). For example,
if 80% of your account is in your traditional balance and 20% is in your Roth balance, and you take a TSP
loan, then 80% of the amount you borrow will be from your traditional balance and 20% will be from your
Roth balance. When you take withdrawals or distributions from your account, however, you can choose
that same proportional method, or you can choose to have the money come from your traditional balance
only or from your Roth balance only.
If you have contributed tax-exempt pay to your traditional balance, we have to keep track of that
money separately. Remember, you don’t pay taxes on tax-exempt contributions you take from your
account, but you do pay taxes on the earnings those contributions make while in your account. Tax-
exempt contributions to your Roth balance are not treated any dierently from the rest of the money
that’s there: the contributions are always tax-free when withdrawn, and the earnings are tax-free if the IRC
qualifying requirements described earlier in this section are met.
Which tax treatment to choose?
Making the decision between Roth, traditional, or a combination of both requires making some educated
guesses. While there’s no simple formula that will provide the perfect answer, there is a logical thought
process you should follow as you make your choice. And that thought process is based on two basic facts:
1. A contribution to your traditional balance will result in more money in your net paycheck. For
example, let’s say your gross (pre-tax) income for the year is $50,000 and your tax withholding rate
is 20%. If you contribute $1,000 to your Roth balance, there is no impact on your taxable income.
However, if you make the same $1,000 contribution to your traditional balance, then your taxable
income for the year will be reduced by $1,000, which means your tax withheld for the year will be
reduced by $200 (20% x $1,000). That $200 reduction results in a bigger net paycheck.
2. But when you take distributions of Roth contributions and qualified earnings on those
contributions in retirement, that’s tax-free income. Reverse the example from the previous
paragraph, keeping the same hypothetical 20% tax rate: If you take $1,000 of traditional money, you’ll
only receive $800. If you take $1,000 of Roth contributions and qualified earnings, you get the full
$1,000.
Clearly, there are pros and cons to whatever decision you make. This is where the educated guessing
comes in: What will your tax rate be in retirement compared to what it is now? While this is impossible
to predict with precision, there are several questions to ask yourself that can make your guess a more
educated one:
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Are you in a very low tax bracket right now?
•
Will you continue to work—either full- or part-time—aer you’ve started to take TSP distributions?