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From BOQ to Measurement Book to RA bill: the billing spine explained

7 min readUpdated September 2026
Key takeaways
  • The BOQ item is the shared key: it carries the description, unit and rate that everything downstream refers to.
  • The Measurement Book turns physical work into a recorded, abstracted quantity against that BOQ item.
  • The RA bill values the measured quantity at the BOQ rate and certifies it — cumulatively — for payment.
  • Every time a quantity is re-typed from one document into the next, accuracy and margin leak. One connected spine removes the re-keys.

Ask three people on a project about the BOQ, the Measurement Book and the RA bill and you'll often get three separate answers — the estimator owns one, the site engineer owns another, the billing team owns the third. That siloing is exactly the problem. These are not three documents; they are one spine, and the BOQ item is its backbone.

1 · The Bill of Quantities (BOQ)

The BOQ is the priced list of everything the contract will deliver. Each line item carries a description, a unit of measurement, an estimated quantity, a rate (backed by a rate analysis) and an amount. The rate is the commercial DNA of the item — every rupee billed downstream refers back to it. Structurally, the BOQ is usually organised by a work-breakdown structure (WBS) so items roll up to sub-works and works.

2 · The Measurement Book (MB)

The Measurement Book is the statutory record of what was actually built. Against each BOQ item, the site records measurements — chainage for linear work, and nos × length × breadth × depth for volumetric work — and abstracts them into a quantity in the item's unit. In public works the MB is a legal document: it is the evidence that the quantity being billed was genuinely executed and measured.

The MB is the gate

You can only bill what the MB records. The Measurement Book is the control point between 'work done' and 'work billed' — which is exactly why it must tie directly to the BOQ item, not live in a separate register that someone reconciles later.

3 · The Running Account (RA) bill

The RA bill takes the cumulative measured quantity for each item, values it at the BOQ rate, sums across items, subtracts what was billed in previous RA bills, and applies deductions (retention, advance recovery, TDS, GST) and any escalation. The result is certified through the sign-off chain and becomes the interim payment. (For the full mechanics, see our guide on preparing an RA bill.)

How work flows through the spine

1
Award & BOQ
The item is created with its unit and rate.
2
Execute
Work is done in the field against that BOQ item.
3
Measure (MB)
The quantity is measured and abstracted into the Measurement Book, tied to the item.
4
Value & certify (RA)
The measured quantity is valued at the BOQ rate, deductions applied, and the bill certified.
5
Reconcile
Cumulative billed vs executed vs budget is tracked to the final account.

Deviations and variations

Reality diverges from the BOQ. Quantities executed beyond the tendered quantity trigger the deviation clause; genuinely new scope needs a variation and a derived (star) rate before it can be measured and billed. The spine has to carry these gracefully — a variation is still a BOQ item with a rate, an MB record and an RA line; it just arrived after award.

Why re-keying is the enemy

In the spreadsheet world, the same quantity gets typed at least three times: measured on a sheet, re-typed into an MB register, re-typed again into the billing workbook. Each re-key is an opportunity for a transposition, a rounding difference or a stale figure. Multiply that across hundreds of items and monthly bills, and the gap between what you executed and what you billed becomes real money — usually money left on the table.

How InCore does this

InCore makes the spine literal: the BOQ item is a shared key across the whole platform. Quantities captured in the field post to the Measurement Book, the MB feeds the RA bill, and material, plant and subcontract costs roll to the Cost Breakdown Structure on the same item. No re-keying between documents — one reconciled number, from the field to the final account.

Frequently asked

What is the difference between the BOQ quantity and the measured quantity?

The BOQ quantity is the estimated quantity at tender. The measured quantity is what was actually executed and recorded in the Measurement Book. Billing is on the measured quantity; differences beyond tolerance are handled through the deviation/variation mechanism.

Is the Measurement Book a legal requirement?

In Indian public works the Measurement Book is a statutory record and the primary evidence for payment — measurements must be recorded and certified in it before the corresponding work can be billed.

How do variations fit into the spine?

A variation becomes a BOQ item like any other — with a derived (star) rate, an MB record of the executed quantity, and an RA-bill line — but it originates from an instruction after award rather than the original tender.

Run this end-to-end in InCore

From the field to the RA bill on one BOQ spine — no re-keying, fully governed. See it on your projects.