Skip to content

GST Billing, Quotation & Invoice Software

Generic billing apps don't match your letterhead, your quotation format or the way you actually sell. We build billing software around your documents — quotations, proforma and tax invoices, delivery challans — with GST worked out automatically from the rates and rules you confirm with your CA.

Get a free quote Email us

What we can build

The starting price covers the package list on the pricing page. Anything else is agreed in your written quote.

Quotations to invoices

Quotation, proforma invoice, tax invoice and delivery challan — convert one into the next without retyping.

GST worked out for you

HSN codes, GST rates and automatic CGST/SGST or IGST split by place of supply, with the total in words. Rates follow what you and your CA confirm, and rate changes are updated under the maintenance plan.

Your letterhead, live preview

An A4 preview updates as you type, so what you see is exactly what prints or emails.

Works offline

Runs on your own computer with a local database. Optional Google Drive backup and Gmail sending.

Customer & product history

Billed and outstanding totals per customer, and the last rate used for every product.

Reports & exports

Revenue by customer, product and state with CSV export — ready for your CA.

Included with every project

  • Document formats matched to your existing letterhead
  • Windows installer or web version
  • Automatic backup set up at launch (kept running under the maintenance plan after the first 30 days)
  • One training session for your billing staff (Google Meet or in Mumbai), recorded for later
  • 30 days of free fixes to what we built (not new features)

Related work

Client projects and our own products in this area.

S.K Trading — Billing App: Quotation to GST invoice in one click, with the printed page live 2:05

Desktop app · S.K Trading & Co.

S.K Trading — Billing App

Quotation to GST invoice in one click, with the printed page live

Frequently asked questions

Yes. We can build it as an offline desktop app that stores data on your computer, with optional cloud backup when you are online. A web version is also possible if your team works from several places.

Yes. Tax is split automatically based on the place of supply, using the HSN codes and rates you and your CA confirm, and the total is written out in words in Indian numbering. We're engineers, not tax advisers, so your CA has the final say on rates and rules.

Yes. We match your existing letterhead and document layout, so your customers see the same format they are used to.

E-way bill details can be added to challans today. Direct e-invoice portal integration can be scoped as an add-on depending on your turnover requirements.

Other services

Have a project in mind?

Tell us what slows your business down. You'll get a free consultation and a written, fixed-price quote — no obligation.

Get a free quote Email us