Try this:

grand total D = basic+OT1+OT2 + allowances+claim1+claim2 -
(deduct1+deduct2+deduct3)

Tom Lake

This will take a little coding for the calculations, bue it isn't that
difficult.  I will use SubTotalA as an example. The others will be the same
with different names.
First, create a Sub in your form module to do the calculation.  Use a Sub
because the calculation will have to be done in several places.

Sub CalcSubTotalA
   Me.SubTotalA = Me.Basic + Me.OT1 + Me.OT2
   Me.GrandTotal = Me.Basic + Me.OT1 + Me.OT2 + Me.Allowances _
       + Me.Claim1 + Me.Claim2 - Me.Deduct1 - Me.Deduct2 - Me.Deduct3
End Sub

In the After Update event of Basic, OT1, and OT2, call the sub:
Call CalcSubTotalA

Create two more Subs like the CalcSubTotalA for CalcSubTotalB and
CalcSubTotalC
Then in the Current event of the form you will need to call all three Subs
to display the information for existing records. Do NOT carry the sub totals
or grand total in your records.  So, in the Current event of the form:
Call CalcSubTotalA
Call CalcSubTotalB
Call CalcSubTotalC

I don't recommend you mix text, the grand total, and date into one text box.
That would be messy.  Instead, create a separate text box for each of the
three.