I have a layout of fields where, from a starting balance number: 'n_start_value', the following for each date:

n_gross_pay— n_fed_tax —n_state tax are subtracted for a balance = c_amt_rec'd. I need that balance to be a 'running total' for each date.

The starting balance is the value of my annuity on 12 Dec '16, then each month I receive a payment from which federal & state taxes are deducted for an amount received. This amount is identical for each month. This amount is deducted from the remaining value of my annuity each month.

I can't find a SummaryFunction' to allow a starting value. Perhaps I need a combination of Functions but it is beyond my ken. Need help!

you need a calculation field:

RunningTotalField + StartNumberField