chperplt,
We'll have to agree to disagree on this, but my opinion is that your base pay IS your pay. The per diem is an allowance that goes up and down depending on your time away from base. It shows up in your paycheck, but it isn't pay. It's a reimbursement for living expense away from home base. If you're in training, it goes away.
For you to say that you exceeded your annual base pay in the final 8 months of the year, you would have had to have been paid the equivalent of 984 hours, or 123 hours a month, which I seriously doubt.
In my current job, I was reimbursed (actual cost reimbursement) over $8000 for per diem/travel for the last 4 months of the year. It's not pay, even though it showed up in my bank account. It's a reimbursement.
And if you want to give him a better number to work from, don't give him your gross pay, give him your taxable for the year. It's a better number to plan from.
FYI my Comair gross taxable from Jun '02 to Jun '03 was $19,598. That's with 2 1/2 months training pay, and 3 1/2 months on reserve. Full base pay for that period would have been $21,402, so I grossed about 92% of that, including taxable allowances. My take home for the first 12 months, including per diem was about $18,500, lower than most because of my higher tax filing status (wife worked and I had my mil retirement coming in).
Full base for Jun '05 to Jun '06 for a first year FO is $24,058. UBA757, you won't be getting off reserve anytime soon, so my guess is that your gross will be in the range of $20,500 to $21,000. Your take home (highly dependent on filing status), should be around $20,000, including per diem.