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I think that worked! Thanks!
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Using the following, I'm trying to force a 0 value into the [BillDt-BillPd] field if the [Bill Paid Date] field is empty. I've tried Null as is demonstrated, 0, IsNull before [Bill Paid Date] &amp;&nbsp;NZ before [Bill Paid Date], none of which worked.<br />
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Over30: Iif([Bill Paid Date]=Null,[BillDT-BillPd]<wbr />=0,IIf([Bi<wbr />llDt-BillP<wbr />d]&lt;30,0,II<wbr />f([BillDt-<wbr />BillPd]&gt;30<wbr />,[BillDt-B<wbr />illPd]-30)<wbr />))<br />
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Thanks, 
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Using the following, I'm trying to force a 0 value into the [BillDt-BillPd] field if the [Bill Paid Date] field is empty. I've tried Null as is demonstrated, 0, IsNull before [Bill Paid Date] & NZ before [Bill Paid Date], none of which worked.

Over30: Iif([Bill Paid Date]=Null,[BillDT-BillPd]=0,IIf([BillDt-BillPd]<30,0,IIf([BillDt-BillPd]>30,[BillDt-BillPd]-30)))

Thanks, 

Access 2007, Using a Null value to change another field to 0

Microsoft Access is a rapid application development (RAD) relational database tool. Access can be used for both desktop and web-based applications, and uses VBA (Visual Basic for Applications) as its coding language.

Microsoft Access

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.