There is no “planning advantage” to having either one large account or two smaller accounts. If they are different types of accounts you may or may not be able to combine them. If one is a Roth IRA and the other is a tax-deferred retirement account (401k, IRA, etc.)
Furthermore, can you participate in multiple retirement plans?
The amount of salary deferrals you can contribute to retirement plans is your individual limit each calendar year no matter how many plans you‘re in. This limit must be aggregated for these plan types: 401(k)
In this way, can you have 2 401k plans at the same time?
There are no rules or laws preventing you from having two or more 401(k) plans at the same time, but enrollment in multiple plans can affect your tax deduction for elective contributions to your 401(k) retirement accounts.
Can you have 2 different ROTH IRAs?
How many Roth IRAs? There is no limit on the number of IRAs you can have. You can even own multiples of the same kind of IRA, meaning you can have multiple Roth IRAs, SEP IRAs and traditional IRAs.
Should I max out retirement accounts?
Try to max out your 401(k) each year and take advantage of any match your employer offers. Contributions are tax-deductible the year you make them, which can leave you with more money to save or invest. Once you max out your 401(k), consider putting your leftover money into an IRA, HSA, annuity, or a taxable account.