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Excel Formula for Invoice Numbering and Tracking

2026-03-18

Auto-Increment Invoice Number

Generate sequential invoice numbers with a prefix (INV-001, INV-002, etc.):

="INV-"&TEXT(ROW()-1,"000")

Subtotal with Tax

Calculate total with 8.5% sales tax. Subtotal in C2:

=C2*(1+0.085)

Days Since Invoice Sent

Track aging of unpaid invoices. Invoice date in D2:

=TODAY()-D2

Overdue Flag

Flag invoices overdue by more than 30 days:

=IF(AND(E2="Unpaid", TODAY()-D2>30), "OVERDUE", "")

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