Construction Billing & RA Bills — Complete Guide for Indian Contractors

What Are RA Bills?

RA Bills (Running Account Bills) are interim payment certificates raised by contractors during the course of a construction project. Unlike fixed-price invoices, RA bills are progressive — each bill covers work done since the last bill, measured and certified by the client's engineer or consultant.

The RA billing cycle in Indian construction typically follows this flow:

• Contractor requests measurement — after completing a defined quantum of work
• Joint measurement — contractor's engineer and client's engineer measure together
• Measurement Book entry — recorded in the official MB with signatures from both parties
• RA Bill preparation — contractor prepares the bill based on measured quantities and BOQ rates
• Checking and certification — client's engineer verifies calculations, applies deductions
• Payment processing — certified amount is processed after retention and advance deductions

In government contracts (CPWD, PWD, state bodies), the RA bill format is standardized. Private contracts may use simpler formats but the principle remains the same.

Measurement Books (MB)

The Measurement Book is the most critical document in construction billing. It records the physical measurement of all work done, serving as the legal basis for payment. Key aspects:

IS 1200 Measurement Standards

All measurements in Indian construction billing follow IS 1200 (Method of Measurement of Building and Civil Engineering Works). This multi-part standard defines exactly how to measure each type of work:

• IS 1200 Part 1: Earthwork — measured in cubic metres, deductions for boulders over 0.03 m3
• IS 1200 Part 2: Concrete work — measured in cubic metres, deductions for reinforcement volume over 2%
• IS 1200 Part 4: Brickwork — measured in cubic metres, no deduction for openings under 0.1 m2
• IS 1200 Part 12: Plastering — measured in square metres, deductions for openings over 0.5 m2
• IS 1200 Part 13: Painting — measured in square metres, two coats counted separately

MB Best Practices

• All pages must be serially numbered and bound (loose pages are not accepted in disputes)
• Entries must be in ink — no corrections with whitener; strike through and initial
• Each measurement entry should reference the drawing number and revision
• Joint signatures of contractor's and client's engineers on every page
• Carry forward abstracts that link measurements to BOQ item numbers

Billing Stages and Milestones

RA bills are typically raised at defined milestones. For a typical residential building (G+14):

• RA Bill 1: Excavation and foundation completed (10-12% of contract value)
• RA Bill 2: Plinth level completed (5-7%)
• RA Bill 3-6: Each 3-4 slabs completed (8-10% each)
• RA Bill 7: Structural frame completed including terrace slab (8-10%)
• RA Bill 8: Brickwork and plastering completed (12-15%)
• RA Bill 9: MEP rough-in completed (8-10%)
• RA Bill 10: Finishing work completed (10-12%)
• Final Bill: All punch list items closed, final measurement (remaining amount minus retention)

For RERA-registered projects, billing milestones must align with RERA-defined stages to maintain compliance. Explore residential construction billing with BuilderXPro.

GST on Construction Services

GST treatment varies by type of construction:

• Works contract for buildings: 12% GST (with ITC) or 5% GST (without ITC) for affordable housing under ₹45 lakh carpet area
• Works contract for non-buildings (roads, bridges): 12% GST with full ITC
• Pure labour contracts: 18% GST under SAC 9954
• Material supply with installation: Treated as composite supply, GST rate depends on principal supply

Key compliance requirements:

• Reverse charge mechanism applies when buying from unregistered suppliers exceeding ₹5,000/day
• E-invoicing mandatory for contractors with turnover above ₹5 crore
• E-way bills required for material movement above ₹50,000
• Place of supply for construction is always the location of the property (important for IGST vs. CGST/SGST)

Common Billing Disputes

Construction billing disputes are common and expensive. The most frequent issues:

• Measurement discrepancies: Contractor and client measure differently, especially for earthwork and plastering where volumes/areas are interpreted differently
• Extra items and deviations: Work done outside the original BOQ scope — who authorized it, at what rate?
• Rate escalation claims: Material prices increased 30% since tender — contract clauses on price escalation are often ambiguous
• Retention release delays: Client holds retention beyond the agreed defect liability period
• Delay damages (LD): Client deducts liquidated damages for schedule delays; contractor claims extensions of time

Digital billing with photo evidence, GPS-tagged measurements, and version-controlled BOQs drastically reduces these disputes. Every claim is backed by data, not memory.

Automating Construction Billing

Modern construction billing software should automate:

• Measurement entry — digital MB with photo attachments and IS 1200 auto-calculations
• RA bill generation — auto-populate from measured quantities and BOQ rates, with cumulative and current-bill breakdowns
• Deduction tracking — automatic calculation of retention, advance recovery, and previous payments
• GST computation — correct tax calculation based on contract type and location
• Approval workflow — multi-level digital approvals with comments and revision history
• Integration with accounting — certified RA bills auto-create payable entries in Tally/accounting system

See how BuilderXPro automates RA billing for Indian contractors.