10k is 10k, no matter where it sits in your portfolio, investing is step one, investing it in the right place is beneficial. If you can contribute 5500 to an IRA and 4500 to a taxable account, you have decreased your tax hit.
What are your other tax advantaged accounts? Are you contributing to a 401k or equivalent.
What is your Asset Allocation?
Have you considered tax efficient fund placement?
http://www.bogleheads.org/wiki/Principles_of_tax-efficient_fund_placementIf you intend to have International Equities Index it's smart to put those in a taxable account. REITS should go in a tax sheltered account. VTSAX is also pretty tax efficient, but you'll still pay more taxes than if it's in your IRA.
Everything depends on your goal and strategy, but general consensus says you should max our your tax efficient funds first, especially early in the year with any lump sum you can contribute and save anything extra as you get it to taxable accounts.