Best Invoice App for Electricians, Plumbers & Contractors in India 2026

As an electrician, plumber, carpenter, painter, or contractor in India, your clients expect a proper bill. With GST in place, a handwritten receipt is no longer sufficient — clients need a GST invoice to claim expenses and ITC. But pulling out a laptop to create a bill after a hard day's work is not practical. You need a billing app that works on your phone, works without internet, and takes less than a minute to create and send an invoice.

Ozydo is built exactly for this — it is India's simplest free GST invoice app for electricians, plumbers, carpenters, painters, interior designers, contractors, and other trade professionals. Install it on your Android or iPhone, create invoices at the job site, and send them via WhatsApp while your client is still in front of you.

What Trade Professionals Need in an Invoice App

• Works on any Android or iPhone — no special hardware.
• Works offline — job sites often have poor or no internet connection.
• Quick to create — you should be able to create an invoice in under 2 minutes at the site.
• Handles both labour and materials on the same invoice — with different GST rates if needed.
• GST-compliant with correct HSN codes for materials and SAC codes for labour.
• Share instantly via WhatsApp — standard for trade communication in India.
• Collect UPI payment on the spot — no waiting for cheques.
• Send estimates (quotes) before starting work, convert to invoice when done.
• Professional PDF — builds trust with clients and contractors.

How Electricians Use Ozydo

A typical electrician job involves both labour (wiring, installation, repair) and materials (switches, cables, MCBs, conduit pipes). These can have different GST rates. Here is how an electrician uses Ozydo:

1. 1Open Ozydo on your phone at the client's site (works offline — no internet needed).
2. 2Create a new invoice — add client name and address.
3. 3Add labour line item: 'Electrical wiring and installation' — SAC code 995469 — 18% GST.
4. 4Add materials line item: 'Electrical cables, switches, MCBs' — HSN code 8544/8536 — 18% GST.
5. 5Ozydo automatically calculates CGST 9% + SGST 9% (or IGST 18% if client is in another state).
6. 6Add your UPI ID — a QR code is auto-printed on the PDF.
7. 7Tap the WhatsApp button — PDF is attached with a pre-filled message showing total amount.
8. 8Client scans QR code and pays via GPay or PhonePe immediately.

How Plumbers Use Ozydo

Plumbing jobs similarly involve both service (labour) and materials (pipes, fittings, valves). With Ozydo, a plumber can:

• Bill labour at 18% GST (SAC 995469 — repair and maintenance services).
• Bill PVC pipes at 18% GST (HSN 3917) or brass fittings at 18% GST (HSN 7412).
• Add multiple line items for different pipe sizes, fittings, and labour charges.
• Issue an estimate before starting the work — get client approval, then convert to invoice.
• Email or WhatsApp the invoice PDF to the building contractor or property owner.
• Collect payment via UPI QR code printed on the invoice.

How Painters and Interior Designers Use Ozydo

Painting and interior work involve labour, paint, primer, hardware, and sometimes furniture. Ozydo handles all of this:

• Labour (painting, wallpaper installation): 18% GST — SAC 995469.
• Paints, varnishes, primers: 18% GST — HSN 3208.
• Furniture and furnishings: 18% or 28% depending on the item — HSN 9403/9404.
• Create a detailed quotation (estimate) before starting with itemised paint quantities and rates.
• Invoice clients in milestones — 50% advance, balance on completion.
• Use Ozydo's shareable link to send a professional invoice to the architect or project manager.

How Contractors and Civil Works Professionals Use Ozydo

Civil contractors working on house construction, renovation, or commercial fit-out bill for works contracts. GST on construction services can be 12% (residential) or 18% (commercial), and materials attract their own rates. Ozydo supports:

• Works contract billing at 12% or 18% as applicable.
• Separate line items for labour and materials with correct HSN codes.
• Milestone billing — bill the client in 3–5 stages as the project progresses.
• Estimates and final invoices with stage-wise payment terms.
• Professional PDF with letterhead-quality output to share with builders, architects, and property developers.