Form 709 Schedule B line 1c : Should we just add applicable credit for all the years?

Hi there,

In Form 709, I am entering info for each of the prior years  2018 and 2019 in Schedule B, column C. I referred to “Table of Basic Exclusion and Credit Amounts”  and entered 4,417,800 for 2018 and 4,505,800 for 2019.

Now I entered 4,417,800+4,505,800= 8923600 in Line 1 Column C: Totals for prior periods.

Is the above correct?

 

Then in Part 1: General information line 8=8923600 and line 7= 4,577,800 Is this correct?

Now for line 9: [Line 7 - line 8] =  4,577,800  - 8923600  = -4345800. Is this correct? It says don't enter numbers less than 0, so should I enter 0 for line 9?

Thank you!