Invoicing Software for Marketing & Creative Agencies

How agencies billing works

Agency billing layers a monthly retainer with project invoices and reimbursable pass-through costs. 399Apps keeps each client’s invoices and outstanding separate, splits the taxable service fee from pass-through line items on the same invoice, and gives every account manager a login — because pricing is flat, not per seat, so adding the team never raises the bill.

GST & TDS, handled right

Agency services fall under SAC 9983 / 998361 (advertising) at 18% GST, with place-of-supply driving CGST/SGST vs IGST for out-of-state clients. Corporate clients commonly deduct TDS under 194C (contract) or 194J (professional) — 399Apps records TDS-on-AR section-wise so each client’s deduction reconciles to 26AS.

The billing problems it solves

Different service, same trap — money earned that never quite gets billed or collected. Here's what 399Apps keeps straight for marketing & creative agencies:

What you get

• ✓Client-wise invoices & outstanding
• ✓Service fee vs pass-through line items
• ✓Retainer + project invoicing with due dates
• ✓Unlimited team logins at a flat price
• ✓TDS-on-AR (194C / 194J), section-wise
• ✓GSTR-1 / GSTR-3B-ready exports

One flat price — the whole team invoices

Most invoicing tools charge per user or per invoice, so growing your practice grows the bill. 399Apps is a flat ₹399/month for your first app and ₹99/month for each additional app — GST invoicing, TDS reconciliation and receivables in one system, unlimited users, cloud or self-hosted. Adding partners, associates or account managers never raises the price.