Build a Billing App for Chartered Accountants and Tax Consultants

What a CA billing app actually needs

Generic invoicing tools were built for shops selling products, not for a professional practice that bills recurring retainers, one-off return filings, audit fees, and out-of-pocket reimbursements against the same client. Kashvi builds the fields your work runs on, so an invoice line can carry an SAC code, the correct GST slab, and a note on whether TDS is deductible by the client under 194J. Because you own the schema, you can shape it to how your firm quotes and collects.

• Client master with GSTIN, PAN, constitution (individual, firm, company) and default GST treatment
• Invoices that split professional fees from reimbursable expenses and apply CGST/SGST or IGST based on client state
• TDS-aware totals so you know the net amount a client will actually remit after deducting tax at source
• A deadline board for GST returns, TDS returns, ROC filings, advance tax and income tax due dates, per client
• Payment status, aging and follow-up reminders so outstanding fees do not slip past a filing season
• Razorpay and UPI collection links attached to each invoice for one-tap payment

GST, TDS and deadlines built in, not bolted on

In an Indian CA practice, tax is not a setting, it is the whole job. Kashvi builds GST computation into the invoice itself: pick the client, add the service, and the app applies the slab and decides intra-state versus inter-state from the client's state code. TDS is treated as first-class too, so a retainer invoice can show the gross fee, the tax the client will deduct, and the net you should expect in the bank. The same app tracks statutory deadlines, so the reminder to file a client's GSTR-3B sits next to the invoice you raised them, instead of on a separate spreadsheet nobody opens on the tenth.

Prompts you could type to build it

You do not write code or configure tables. You describe the practice and refine from the live preview. Start with one of these and adjust as your app takes shape:

• Build a billing app for my CA firm. Clients have GSTIN and PAN. Invoices split professional fees and reimbursements, apply the right GST slab, and show TDS to be deducted so I see the net amount I will receive.
• Add a deadline tracker with a board of GST return, TDS return, ROC and advance tax due dates per client, and send me a reminder three days before each one.
• Add Razorpay and UPI payment links to every invoice, and a dashboard of outstanding fees sorted by how many days overdue they are.
• Give my two staff accountants their own logins where they can draft invoices, but only I can mark an invoice as final and issued.

Real code, real database, yours to keep

Every app Kashvi builds is a genuine application, not a page inside a builder you can never leave. The data lives in a real Postgres database. Sign-up and login are real authentication. When you download the project, you get the full source and can host it, hand it to a developer, or extend it yourself. For a firm holding sensitive client financials, that ownership matters: your billing records are not trapped in someone else's account.

Build it once, use it on your laptop at the office and on your phone when a client calls about a pending invoice. When a proprietor pays a bill on their phone through a UPI link, the status updates in the same app your staff draft invoices in.