Find The Invoice Shortfall Balancing Amount Using Excel Formula

I need to change an If statement, as the conditions have changed.

In specific it's a invoicing financing system, where the total facility has changed on a base calculation of £2M from 30% being available to 40%. I have managed to work out the formulas for this, but I am having a problem with the Invoicing shortfall, i.e. how much invoice vale that needs to be added to reach the £2M max. It shouldn't change:
A B C
1 Values
2 Invoice Upload £100,000.00
3 Cash Availability £425,934.45
4 Account Balance -£17,474.26
5 Cash Receipts £20,000.00
6 Invoice Amount Shortfall £521,970.97
7 Invoice Shortfall - Amount not utilised £156,591.29
8 Cash Withdrawn £200,000.00

A D
1 Today
2 Invoice Upload 0.00
3 Cash Availability 275,934.45 IF(B6>0,B3+B5-B8+B2*0.3,600000+C4)
4 Account Balance -197,474.26
=B4+B5-B8
5 Cash Receipts 0.00
6 Invoice Amount Shortfall 521,970.97 IF((600000+B4-B3)>5000,(600000+B4-B3)/0.3,0)
7 Invoice Shortfall - Amount not utilised 156,591.29 IF(C6>0,C6*0.3,0)

A B F
1 Sunday
2 Invoice Upload 0.00
3 Cash Availability 275,934.45 IF(C6>0,C3+C5-C8+C2*0.4,800000+E4)
4 Account Balance -197,474.26
C4+C5-C8
5 Cash Receipts 0.00
6 Invoice Amount Shortfall 891,478.23 IF((800000+E4-E3)>5000,(800000+E4-E3)/0.4,0)
7 Invoice Shortfall - Amount not utilised 168,788.39 IF(E6>0,E6*0.4,0)
8 Cash Withdrawn

Any help?
Attachment 1331

Not sure your question is clear. In the example file, where do you need the formula? And what should have been the calculated Shortfall according to you?