Technically, the first testing date will still be December 31, 2021, but there is a favorable rule that generally allows a Qualified Opportunity Fund (QOF) to exclude newly contributed funds from both the numerator and the denominator in the calculation on the next testing date that follows the contribution. But there is a technical problem with this taxpayer-friendly exclusion: if the QOF's only assets are the contributed capital, and all of the contributed capital is excluded from the numerator and the denominator on the December 31, 2021 testing date, the QOF will have a division by zero error; it does not automatically satisfy the 90% test. This does not appear to the IRS's intent behind this exclusion, but we recommend, out of an abundance of caution, that the QOF invest at least some small portion of contributed funds into qualified opportunity zone property by December 31, 2021.