This is a finance question rather than a tax question.
It sounds as if you over-withheld during calendar year 2019, and you are wondering if there is a good way to invest it and not pay the IRS until April 15th.
If so, I would encourage you to consider the following:
1. Most investments are risky (i.e., you can lose principle). The major exceptions are FDIC protected accounts (like your checking or savings accounts) and Treasury bills which are backed by the full faith and credit of the US government. You will owe the money to the IRS even if you lost it in a bad investment.
2. The interest on these safe accounts is generally much less than the penalty that the IRS may charge you if you underpay the estimated tax during the year or can't pay the tax due by April 15th.
You might ask a finance question like this in the Financial Discussion board here on the Community.
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