GST Period Computation — Books & Numbers

Upload GST files

Upload your EINV monthly files (outward supply) and the IMS file (inward supply / ITC) downloaded from the GSTN portal. All processing happens in your browser.

EINV files — outward supply

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EINV Monthly Files

Multiple files · One per month · .xlsx

File names: EINV_29AAICP1400G1ZP_2425 Nov.xlsx
Select all months at once — Ctrl+Click or Shift+Click.

IMS file — inward supply / ITC

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IMS File

Single consolidated file · .xlsx

File name: IMS_29AAICP1400G1ZP_01042025_1.xlsx
Contains B2B, B2BA, B2B-CN, B2B-DN sheets.

Computation settings

Confirm the GSTIN and set the financial year and period range.

GSTIN & entity

GSTIN (auto-detected)

Entity / Trade name

Financial year

Periods to include

Periods are auto-detected from your EINV file names. Uncheck any period to exclude it from computation.

Computation options

Include debit notes (B2B-DN) in ITC if present in IMS file Deduct credit notes (B2B-CN) from ITC Flag periods where ITC exceeds Output Tax (carry-forward indicator) Validate GSTIN consistency across all files

GST Computation