In general - all things being equal with regards to fund availabilities, fees, etc - is it better to add funds to an existing IRA each year, or open new ones?
Are there different tax benefits to either approach?
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The benefit of multiple accounts -
I'll edit (and invite others to) if I think of others, but Dilip's answer, 'no' is correct. Taxwise, no benefit.
There are no differences tax-wise for the current year as long as we are comparing apples to apples and oranges to oranges, that is, we are not talking Traditional vs Roth IRA contributions. But, investment-wise, it can make a difference. Here are two reasons why contributing to an IRA account that you already have can be better than starting a new account.
Some IRA custodians charge an annual fee (typically $10-$25 and possibly per mutual fund) over and above the (hidden) expenses charged by mutual funds that show up as a reduced return on your investment: but waive this fee if the total value of the IRA account is large (or if you sign up for electronic delivery of documents etc). So, adding to an existing account may put you above the threshold where such fees are charged.
Some mutual funds offer share classes with lower expense ratios if your investment is large enough. So, in some cases, adding this year's contribution to a mutual fund that you already hold in your IRA can be better in the long term from the investment perspective than opening a new account, possibly with a new custodian, in a similar fund. Of course, if the mutual fund that you currently hold in your IRA is not one that you want to add to, but you don't want to sell that fund and invest in something else either, then by all means invest in a new fund.