Thanks @JamesG1 for the very quick reply!!!
Based on your advice, I went to IRS.gov to read more about using the installment method.
Please give your opinion if what I read is interpreted to mean that I have a choice whether to account for all the capital gain in 1 year, or split it between 2019 and 2020 based on the amount of money received in each year.
See pub 537: https://www.irs.gov/pub/irs-pdf/p537.pdf
Between page 4 and page 5, I read the following:
Electing Out of the Installment Method
If you elect not to use the installment method, you generally report the entire gain in the year of sale, even though you don’t receive all the sale proceeds in that year.
...an example is shown, and then it states the following:
"How to elect out. To make this election, don’t report your sale on Form 6252. Instead, report it on Form 8949 or Form 4797, or both.
When to elect out. Make this election by the due date, including extensions, for filing your tax return for the year the sale takes place."
