For expenses I used joint owner,  but for investment accounts I used individual account owner.  So basically if i understand correctly the App takes 50% of total expenses and finds funds from me and my spouse  to fulfill the requirement (spending + taxes) due to for each individual?

Yes,

That’s mostly correct. Joint expenses are attributed proportionally to income so not necessarily 50%. But you got the important point that each spouse pays them from their own accounts (and joint accounts when available).

Thank You for the prompt response.  OK.  This gives me a better understanding. "Joint expenses are attributed proportionally to income so not necessarily 50%" Understood...

On this note, 

1.   From above,  if  joint expenses are attributable proportionally to  income for each spouse ( say salary, investments, CPP etc)....  what happens when additional shared income is in play,  say from CPP sharing or RRIF income are shared for each spouse, how is this addressed ?

2.  On the basis of #1 above,  say one spouse splits their CPP directly at source (CCP sharing via request to CPP) before CPP starts (to even out  CPP income for both spouses) ,  how  do we account for this in input data?

 3.  In addition to #2 above,  say for example one spouse on their taxes splits pension income (RRIF withdrawal)  starting  @65 with the other spouse, how do we account for this in input data?

I should have specified taxable income. Here’s the gory details:

1.If we have previous year’s taxable incomes for the spouses (sum of the two is not 0), we use those to determine the proportion, so that deals will all the income splitting/sharing.

2.If that doesn't work we use the current total incomes of each spouse. That’s before the CPP/taxes calculations, so no pension splitting/sharing is considered in that case.

3.If that doesn’t work we use the net worths of each spouse (previous year, sum of the two is not 0).

4.If that doesn’t work we use 50%.

This is re-calculated for every year in the TIME MACHINE.

#1 usually works although #2 is often applied in the current year if a user doesn’t bother to enter last year’s taxable incomes in the TM preflight input screens. 

#3 and #4 rarely happen.

Is there a way to force splitting of joint expenses based on net worth of nonregistered investment accounts?  I have a case where current incomes for both are zero as we are drawing down on nonregistered investments.  However, one spouse has nonregistered investments 2 times higher than the other, so we'd like to draw down proportionally but TM takes 50/50.  Result is that lower spouse's nonregistered investments are depleted very quickly.  So far my only solution is to create two separate, individually owned expenses using a % I determine ahead of time.  Is there a better way to achieve my goal?

I explained in an earlier post on this thread how Joint expenses are attributed to each spouse, Most cases it's actually #1: last year's taxable income. I think it's CRA friendliest way to split the Joint expenses as usually you want the higher income spouse to pay for expenses so that the lower income spouse can invest or stay invested. The ratio is often 50% after retirement, because of pension income splitting in later years which equalizes the taxable incomes, then there is no lower-income spouse.

If you want to specify how the Joint expenses are attributed to each spouse, then enter individual expenses for each, as you did.

The only thing I would add is that expenses, Joint or not, are reassigned from one spouse to the other to solve a cash-flow problem in the TIME MACHINE, that is spouses can help each other out.